Need help with power supplies

I've been reading about electronics for a while and watching the Make podcast and I've finally started making my own projects. Anyway I have some cordless tools with 3 extra batteries but only one of them still takes a charge. So I thought it would be cool if I could put a power supply in one of my dead batteries so that I could plug it into the wall. I've been looking around my garage and thrift stores for a wall wart that would get the job done (the batteries are 19.2V Craftsman batteries I think they pull about 2000ma) but the closest I've been able to find is an old laptop power cord has a DC output of 19v and 3.9amps. So I'm not sure if that will work or if the extra amps will burn out my tools or something. Does anyone know if it would work? If not how can I dial down the amps?

Topic by cannedham160   |  last reply


Short range battery operated 2 part (door alarm type) distance sensor.

Hello all! I'm looking to design a range compact distance sensor that will sense 1-4 ft increments. If necessary i could modify a door alarm. id like to fab one or multiple if need be to sense the distances noted. I could utilize a buzzer or some way to record a voice that would alert to said distance. The battery voltage max is 4.2v dc and if it could be rechargeable that would be a plus. Any help on this would be greatly appreciated. Thanks!

Topic by Automan350   |  last reply


WiFi Radio / MP3 Player with ESP8266

Hello everyone, I'd like to make a new project: Reading in an usb stick with .mp3 files, and playing them. Moreover to swtich from mp3 playing to a wifi radio station. Basically I'd like to use a nodemcu ESP8266 for this project. This was my idea (s. Attachment) My questions: Does it work? Is the controller of the ESP8266 powerful enought to fit these requirements? Do you have improvements for this project? Best regards, Julian

Topic by julianpe   |  last reply


POTENTIOMETER WITH ESC

Hello everyone!  I currently have a project in development which is lacking only one step. I am making a DIY Electric skateboard powered by a Arduino UNO board. I have some leds in the back working fine, the esc and motor work when I adjust the delay to 1300 miliseconds.. But my problem is to control the esc and motor via de potenciometer. Right now my potenciometer only reads me the values from 0-1023 but nothing happens. I have a map in my code but nothing is moving when using the potentiometer. Can someone help me out to make the potenciometer work? Here is the link to the instructables page where I have all the materials I used and also the code! https://www.instructables.com/id/DIY-ARDUINO-SKATEBOARD/ Thanks in advance!!

Topic by MauroGB   |  last reply


Hall effect sensor to trigger relay

Hi! I have a project that needs to sense whether water is flowing through a pipe. I bought a water flow sensor on Amazon (https://www.amazon.com/gp/product/B01LVWHJP0/) thinking I could use it as a basic switch, however, it's got a hall effect sensor and I don't understand how to deal with the voltage output. Measuring from the pulse signal to ground, the sensor swaps the polarity each time it's triggered: With water running, I see a positive voltage. Turn the water off and back on, voltage goes negative. My control system can't deal with this. What I need is a simple circuit to turn the sensor's pulse output into a contact closure. Can anyone help? Thank you!

Topic by rpdubz   |  last reply


Sound Locator Circuit?

Hey all, Here's an idea maybe one of you solder-jockeys can help me out with: Ever have a sound that you'd like to find the source of, but your ears can't tell you where it's coming from?  I'd like to build a circuit to do that. I was thinking of something like three electret microphones with op-amps between them in differential mode.  That would give three signals that would be, presumably, the ratio of sound coming from each mic.  (And, therefore, an indication of direction.) Of course, I'd also like to get an adjustable bandpass filter in there somewhere to isolate just the sound I'm looking for.  That's the part that complicates all designs I've thought of. And then, if I could somehow figure out distance too, that would be the ULTIMATE! Here's one possible use case: A car makes a funny squeal noise a highway speeds. The mechanic takes out this device and magnets it inside the hood.  He runs a control wire back to the cabin. Once the car is in motion and making the desire noise, he adjusts the BP filter using potentiometer(s) and a pair of headphones. The device tells him where (relative to itsself) the sound is coming from. Your bill is less because the problem was diagnosed quickly without a lot of guesswork. Thoughts?

Topic by PS118   |  last reply


Liquid dispenser wireless pour control

Hi guys, anyone knows the concept behind this https://www.youtube.com/watch?v=nAJvbFYtpIU. It is a wireless drink pourer, that can control the liquid flow. Can't find if something like this can be made with Arduino. Does some one have an idea if this can be done?

Topic by justforcavaliers   |  last reply


HEMI no programing required !

Hello  I am interested in build a simple mini line following robot  like HEMI dome shape design, has any one here built this robot ! or ones like it, and information on where to get parts mini or micro gear box, and motor and mini wheels to fit as well as mini circuit boards or I will make one via you tube . . Thanks any help appreciated  David  

Topic by beginner 1    |  last reply


Project issue

Whenever I have Microsoft Project open to read mpp document, it brings the whole system operation to a crawl. Forget about using a browser whenever that program is open; it slows everything down. Any suggestions as to what causes this?

Topic by Ross0298   |  last reply


3.5mm 5.1 Surround Sound Switch/Splitter Box for 2 inputs

Hello, my first post here, so it might be in the wrong section, please move it if necessary. I have quite a complicated problem. Currently I have 1 PC with 5.1 speakers and recently bought a 5.1 headset with microphone. Already  I have a problem when I want to switch between speakers and headphones, each time I have to go under the desk and change the cables :/ In a few months I plan to buy another computer (old one is used up, but it is still quite good equipment). And here begins the stairs. I do not need a second monitor or keyboard plus a mouse, so I want to buy a KVM (keyboard / video/ mouse) switch. The mouse and keyboard are USB ones, so the KVM must support USB. Monitor and graphics card are connected through DVI, which I want to keep, so I must have a DVI KVM. I also want to be able to switch between headphones and speakers. So I thought about this: cs1782 But this works only for one 'source': I could use either speakers or headphones, switching from one PC. But I would like to be able to choose whether I want to use speakers or headphones on both of the PC, so I was thinking about doing (I have not found anything like this to buy, which is strange, because more and more people have the same problem) something like this. But as to be able to do: - Switch between headphones and speakers at PC1 - Switch between headphones and speakers at PC2 - Switch between PC1 and PC2 - Using headphones on PC1 and speakers on PC2 (or vice versa) simultaneously. I've came out with this picture, which should  be able to do this: - Switch between headphones and speakers at PC1 - Switch between headphones and speakers at PC2 - Switch between PC1 and PC2 But I still can't figure how to make this: - Using headphones on PC1 and speakers on PC2 (or vice versa) simultaneously. The more I  think about it, the more I get the idea that it can't be done via DPDT switches, but I don't know what to use. Is it even doable? I have no experience in electronics (I did solder couple of wires in my life, but nothing more), but I have a lot of enthusiasm, so I could make such magic boxes, if I knew how. Thanks in advance for any suggestions, ideas, etc. I also hope that this problem will be useful to someone else.

Topic by ratm4n   |  last reply


Shock alarm clock

Hi,  I want to build a Alarm that will shock you when the clock hits a certain time i am new to this could someone help me out ?!

Topic by josephwilmott2   |  last reply


How to make 12V 2 switch touch panel for car?

Hi guys, I am looking to make a 2 button switch panel for car. I'd like to have capacitive buttons rather than ordinary switches if possible. Something similar to this but smaller and only 2 buttons 1 button needs to be momentary as this is an external power button wired into tablet. 1 button needs to be latching (press for on, press again for off) this controls the accessory power (amp/usb hub etc linked to this) I would like to have them backlit and behind some acrylic so you can just see the light but activate the switch. The capacitive touch buttons I have seen so far all seem to be under 5v and I'll need to work with 12v since it will be inside car. Any help on this would be greatly appreciated 

Topic by alexmallaburn   |  last reply



USB to ps/2 keyboard adapter

I gather that computers that only have ps/2 sockets (no usb connectors) cannot simply use a basic adapter for plugging in a usb keyboard. I have never tried. Would it be possible to create an adapter to allow a usb keyboard to be used with such a pre-usb computer ? I found one arduino project that converted ps/2 to usb and I imagine that to be more difficult.

Topic by scubascooby   |  last reply


Trying to turn on and off leds with tv usb

I have LED lights in the back of my tv ( ambilight ), but they stay on when the tv turns off . What I am trying to do is to turn off with the USB on the tv with a relay . I'm thinking if it is possible to use the 5v from the tv usb to power the relay so when the tv stars it gives power to the usb , starts the relay, that is connected to the "+" of the leds and makes the connection to turn on the lights. My question is i'm not a electronic guy and I don't know if it will damage the tv or the lights . should i use something else like a diode? This is the relay i'm using https://www.amazon.com/Songle-House...2403297&sr;=8-2&keywords;=songle+srd-05vdc-sl-c

Topic by pastos 


Led Clock Feasibility - my first arduino project

Hi guys and good morning all from a total newbie to this world. The aim of this post is to ask you guys if i'm going the right direction to master the knowledge to build my project. To cut a long story short, my plan is to build a clock mixing the old style design of reclaimed pallets with a touch of modernity using LEDs to mark hours , minutes and seconds. The aim is to keep all the lights ON once the given time has passed. To be clearer, if the minutes are "18" i would like all the previous leds (0 to 17) to be all on. I'm pretty sure that the knowledge to build this resides in mastering Charlieplexing and Shift Registering (please correct me if i'm wrong). So at this point in time, i know what i have to "study" to give life to my project the way it's designed in my mind. I've already seen some clocks working this way, hence i'm pretty sure it can be done (happy days!). Point is that i've only seen clocks where this design is achieved with only 1 row of leds. My aim is to swith on 4 rows at any Tn time. So, for the minutes, once it reaches 59, i should have 59 * 4 = 236 LEDs ON simultaneously (for the minutes only... plus N for the hours). Can anyone point me to the right knowledge to be mastered to achieve this? I'm assuming is a problem of sustainable voltage (resistors, power supplies etc etc) leds in paralel/serial; multiple shift registers and so on so forth... I'm attaching a small mock-up to be understandable on what i would like to achieve (it's based on the first 5 minutes of each hour). I've marked "Ok" the first row, meaning that since i've seen something similar, i'm confident in knowing what needs to be mastered to achieve that result. The "?" refers to what i haven't been able to understand if it's achievable or not (row 2, 3 and 4). Would it be advisable to build a Matrix for each of the 4 row (with N 8-bit microcontroller such as SN74HC595, for each row) , or can be achieved with a "simple" 4 X 60 matrix? Thanks a lot in advance to everyone "wasting" their time to give a helping hand! Seeya! Ivano

Topic by IvanoArduino   |  last reply


Alternative to keyboard

On top is a joystick like an NES joystick. It registers 8 different directions: up, down, left, right, and the in-betweens of those and is controlled by the thumb. Then there are 4 buttons, one for each finger. The joystick replaces the trackpad of a laptop and hopefully is also 'clickable'  to act as a 'left click button. I'm not sure what would do the right click button. Combinations of button presses and joystick directions would replace the keys on a keyboard. I only have the use of my right hand. I initially thought of this as a device for handicapped people like myself, but it would also be good for people lying in bed. The concept maybe could be made into a cell phone case with physical buttons that would allow people to text without looking at their phones. The device is a lot like the nintendo wi remote, but not quite. Maybe a wii remote could be hacked to make a prototype. I wouldn't know how to do that and I wouldn't know how to program it, that's why I'm posting, to see if someone could tell me what kind of skills/knowledge would be needed to make this idea happen. Any suggestions or offers to help are welcome. Thank you!

Topic by avocadostains   |  last reply


Vacuum forming heat source

Hi! I am planning to build a vacuum forming machine that does not use a seperate oven to heat the plastic. For my 3D printing hobby I have come across many heated beds, also some on 230v. Could something like this (https://www.ebay.com/itm/30X30CM-750W-220V-Silicone-Heater-3D-Printer-Heated-Bed-Pad-30cm-Thermistor/401257671771?hash=item5d6cd22c5b:g:iVEAAOSwx6pYrp70) with a heat sink be used for such an application? Thanks!

Topic by ttreurniet   |  last reply


Li-Ion battery pack

Hi, I have 4x PANASONIC CGR18650CG LI-ION BATTERY 2250mAh 3.7v.  I have connected them in series and it gives around 14v. My internet router is working on 12v 500mA. Is this battery pack too much for that router? I was thinking to use that battery pack as backup for my router when there is no electric power, because it's winter and every few days there are problems with power. Thanks!

Topic by AdvanŽ   |  last reply


Re-programming a Microchip RN2903 Mote - DM164139 with Arduino IDE

I am interested in creating a pair of 915MHz radios with Microchip'sRN2903 Motes to send basic messages to each other.  Can they be re-programmed with Arduino IDE?

Topic by Do_Not_Give_Up   |  last reply


CNC Laser Printer

Looking for someone to help me build a Laser printer. I want to go A0 size. Use Photographic negative, that is to use a developer and fixer liquid once the image is done. The image has to be B&W photographically with a sharp image quality. What sort of laser would allow me to have a high resolution? Thanks jag2x

Topic by jag2x   |  last reply


400 Volts 3 phase to 240 Volts Single phase Motor

Hello we bought a cutter from Europe.  It came with 400V 0.75W  3 phase  motor. The motor has leads W2, U2, V2 U1,V1, W1 To convert to the 240 V single phase we jumped (W2,U1), (U2, V1), (V2,W1). We also put 50uf capacitor between (W2,U1), and (V2,W1) .See attached pictures. However the motor starts and spins for about 5mins then it trips the breaker. The motor heats up . Voltage reading Between (W2,U1) and (U2, V1) =240v Between (W2,U1) and (V2,W1) = 370v Between (U2, V1) and (V2,W1) =240v We thought  (W2,U1) and (V2,W1) = 370v was little high. Also the resistance between winding W1W2 is 36 ohms, U1U2 20 ohms, V1V2 20ohms Can someone help? I will really appreciate you help

Topic by ngong123   |  last reply


Arduino codes

Good evening Sir, Madam, I am currently attempting to build a circuit for a college module that would use vibration data from a dc motor then send it to a microprocessor before transferring the data via Bluetooth to a pc. I have trawled through numerous sites for the correct components to use but. My question is this. Is there a Arduino code that would enable this idea to be successful? Having never written a code I am somewhat stumped and stressed out to the max. I would be grateful of any help or advice you can offer, Thank you in advance for your time over this, Best regards Mark sheldon

Topic by Shaggy74   |  last reply


Web design & development series

Hi, I am web designer & developer form Nederland. I've been looking around here for some time and it seems like there are not many series that cover everthing about how to design and then develop a website. I thought it would be awsome to create a instructsble serie that let's someone develop there own website in pure HTML & CSS. So I have a couple of ideas. - explaining the basics of flat design (todays standard in web design) - creating a website in pure html & css from the ground up - creating a compleet wordpress theme - much more If you like one of the above ideas or if you have one of your own, please let me know. Thanks for reading. And let me know what you think! Greetings from Holland.

Topic by Kevin Tipker   |  last reply


Implementation of two way communication

Hi, I'm working on a project where we're working on a tele-operated robot and we are looking to include the ability to have a conversation. We would be looking to use earbuds and a microphone on the operator side and a speaker and microphone on the robot side. Does anyone know how to go about implementing this? It needs to be hands free on both ends as the operators arms are being mapped to the robots arms. Thank you.

Topic by ArnoldM27   |  last reply


Microwave generator...... any datasheet for DAIHEN

Hi.I have a microwave generator from DAIHEN. It is a 3kW magnetron that makes 2450MHz wave.The model is ATP-30B(high voltage unit) and SMA-30DI(magnetron unit).This devices made in Japan and I need DATASHEET.If there is any clue that can help me plz inform me. thx

Topic by HesamP1   |  last reply


Watering Pump with LCD, Arduino. Need some help with code

Hi, Building watering unit with LCD, based on Arduino mega. I couldn't get correct value on LCD. I want to show current sensor readings. Could you please help #include #include LiquidCrystal_I2C lcd(0x27,20,4); int PUMP = 13; int sensor = 8; int val; const int DigitalInPin = 8; int sensorValue = digitalRead(8); void setup() {   pinMode(13,OUTPUT);   pinMode(8,INPUT); lcd.init();                      // initialize the lcd lcd.init(); delay(100); } void loop() {    val = digitalRead(8);     if(val ==LOW)   {   digitalWrite(13,LOW);   }   else   {   digitalWrite(13,HIGH);   }   delay(400); lcd.backlight(); lcd.setCursor(0,0); lcd.print("Soil Moisture:"); sensorValue = digitalRead(8); lcd.setCursor(0, 1); lcd.print(sensorValue); }

Topic by PASHGEN   |  last reply


need a cheap way to use a servo and switch on LED's with a remote

I need to move a small servo left and right and have it stay where I leave it and power 1 or 2 sets of lights with a simple remote but I have no idea how to achieve this apart from use a radio control transmitter/receiver and an electronic speed controller. I see there are lots of little devices out there that could work but being a noob at electronics I'm not too sure what will work. I found this, would something similar to that work? It is 12v, my servos would only take about 6v max though, same with the LED's, I suppose I could use something to lower the voltage output? Cheers.

Topic by 1/104   |  last reply


Programming XMC1100 from Windows10 on a MacBook Pro doesn't work ?

Hello, I'm trying to get a connection between my Microcomputer XMC1100 and my Windows10 Partition on a MacBook Pro. I've installed the recommended development environment Dave from Infineon and everything works fine except the connection to the microcomputer. Is this connection maybe due to hardware not possible?  What else could be the reason ? Please help, regards 

Topic by -mister-   |  last reply


new to arduino, want to run a dual display for 2 sensors

I'm new to the Arduino community.  wanting to set up a dual radar setup with 2 ultrasonic sensors,  (Ultrasonic Sensor Module HC-SR04), and outputting to a pair of 7 segment displays ( two 7 segment displays each).  I've found a code to do a single could use a lot of help to output two at the same time, basically 2 lanes without 2 units.  im using an arduino mega, ordered a unor3 and hopefully it can be made to run on one or the other. code is as follows: /* HC-SR04 Sensor    The circuit:     * VCC connection of the sensor attached to +5V     * GND connection of the sensor attached to ground     * TRIG connection of the sensor attached to digital pin 2     * ECHO connection of the sensor attached to digital pin 4  */    /*  This is a radar ping sensor that calcultates the speed of an  object traveling away or towards the sensor. I took some of this  code for the HC-SR04 Sensor implementation by Tautvidas Sipavicius. The rest  is original code from me. I know that the seven segment display  code is not the best to look at or the most optimized but it  serves its purpose just fine and is easy to understand.    Written by Matthew Ladd  */   const int trigPin = 2; const int echoPin = 4;   void setup() {   // initialize serial communication:   Serial.begin(9600);   //First 7 segment (ones place)   pinMode(30,OUTPUT);//F   pinMode(31,OUTPUT);//G   pinMode(32,OUTPUT);//E   pinMode(33,OUTPUT);//D   pinMode(34,OUTPUT);//C   pinMode(35,OUTPUT);//B   pinMode(36,OUTPUT);//A   //Second 7 segment (tens place)   pinMode(37,OUTPUT);//F   pinMode(38,OUTPUT);//G   pinMode(39,OUTPUT);//E   pinMode(40,OUTPUT);//D   pinMode(41,OUTPUT);//C   pinMode(42,OUTPUT);//B   pinMode(43,OUTPUT);//A } void zerofirst(){   digitalWrite(30,LOW);   digitalWrite(31,HIGH);   digitalWrite(32,LOW);   digitalWrite(33,LOW);   digitalWrite(34,LOW);   digitalWrite(35,LOW);   digitalWrite(36,LOW); } void onefirst(){   digitalWrite(30,HIGH);   digitalWrite(31,HIGH);   digitalWrite(32,HIGH);   digitalWrite(33,HIGH);   digitalWrite(34,LOW);   digitalWrite(35,LOW);   digitalWrite(36,HIGH); } void twofirst(){   digitalWrite(30,HIGH);//F   digitalWrite(31,LOW);//G   digitalWrite(32,LOW);//E   digitalWrite(33,LOW);//D   digitalWrite(34,HIGH);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void threefirst(){   digitalWrite(30,HIGH);//F   digitalWrite(31,LOW);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,LOW);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void fourfirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,HIGH);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,HIGH);//A } void fivefirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,LOW);//D   digitalWrite(34,LOW);//C   digitalWrite(35,HIGH);//B   digitalWrite(36,LOW);//A } void sixfirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,LOW);//E   digitalWrite(33,LOW);//D   digitalWrite(34,LOW);//C   digitalWrite(35,HIGH);//B   digitalWrite(36,LOW);//A } void sevenfirst(){   digitalWrite(30,HIGH);//F   digitalWrite(31,HIGH);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,HIGH);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void eightfirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,LOW);//E   digitalWrite(33,LOW);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void ninefirst(){   digitalWrite(30,LOW);//F   digitalWrite(31,LOW);//G   digitalWrite(32,HIGH);//E   digitalWrite(33,HIGH);//D   digitalWrite(34,LOW);//C   digitalWrite(35,LOW);//B   digitalWrite(36,LOW);//A } void zerosecond(){   digitalWrite(37,LOW);   digitalWrite(38,HIGH);   digitalWrite(39,LOW);   digitalWrite(40,LOW);   digitalWrite(41,LOW);   digitalWrite(42,LOW);   digitalWrite(43,LOW); } void onesecond(){   digitalWrite(37,HIGH);   digitalWrite(38,HIGH);   digitalWrite(39,HIGH);   digitalWrite(40,HIGH);   digitalWrite(41,LOW);   digitalWrite(42,LOW);   digitalWrite(43,HIGH); } void twosecond(){   digitalWrite(37,HIGH);//F   digitalWrite(38,LOW);//G   digitalWrite(39,LOW);//E   digitalWrite(40,LOW);//D   digitalWrite(41,HIGH);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } void threesecond(){   digitalWrite(37,HIGH);//F   digitalWrite(38,LOW);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,LOW);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } void foursecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,HIGH);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,HIGH);//A } void fivesecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,LOW);//D   digitalWrite(41,LOW);//C   digitalWrite(42,HIGH);//B   digitalWrite(43,LOW);//A } void sixsecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,LOW);//E   digitalWrite(40,LOW);//D   digitalWrite(41,LOW);//C   digitalWrite(42,HIGH);//B   digitalWrite(43,LOW);//A } void sevensecond(){   digitalWrite(37,HIGH);//F   digitalWrite(38,HIGH);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,HIGH);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } void eightsecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,LOW);//E   digitalWrite(40,LOW);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } void ninesecond(){   digitalWrite(37,LOW);//F   digitalWrite(38,LOW);//G   digitalWrite(39,HIGH);//E   digitalWrite(40,HIGH);//D   digitalWrite(41,LOW);//C   digitalWrite(42,LOW);//B   digitalWrite(43,LOW);//A } long distanceOverTime(long first,long second){  return ((first-second)/.1)*.0223693629;//taking cm/s to mph } long holder;//store the cm from last time through loop. long temp;//used to store the speed value after changes int counter; void loop() {   // establish variables for duration of the ping,   // and the distance result in inches and centimeters:   long duration, inches, cm;   int tens;   int ones;   long Speed;   // The sensor is triggered by a HIGH pulse of 10 or more microseconds.   // Give a short LOW pulse beforehand to ensure a clean HIGH pulse:   pinMode(trigPin, OUTPUT);   digitalWrite(trigPin, LOW);   delayMicroseconds(2);   digitalWrite(trigPin, HIGH);   delayMicroseconds(10);   digitalWrite(trigPin, LOW);     // Read the signal from the sensor: a HIGH pulse whose   // duration is the time (in microseconds) from the sending   // of the ping to the reception of its echo off of an object.   pinMode(echoPin, INPUT);   duration = pulseIn(echoPin, HIGH);     // convert the time into a distance   inches = microsecondsToInches(duration);   cm = microsecondsToCentimeters(duration);   Speed=distanceOverTime(holder,cm);   holder=cm;//after speed caclulation so take the cm value for another calculation   Speed=abs(Speed);   if(Speed!=0 || counter==10){     temp=Speed;     counter=0;   }else{     counter++;   }   if(temp>=100){    zerofirst();    zerosecond();   }else{     ones=temp%10;     tens=temp/10;   }   if(ones == 0){     zerofirst();   }else if(ones==1){     onefirst();   }else if(ones==2){     twofirst();   }else if(ones==3){     threefirst();   }else if(ones==4){     fourfirst();   }else if(ones==5){     fivefirst();   }else if(ones==6){     sixfirst();   }else if(ones==7){     sevenfirst();   }else if(ones==8){     eightfirst();   }else if(ones==9){     ninefirst();   }   if(tens == 0){     zerosecond();   }else if(tens==1){     onesecond();   }else if(tens==2){     twosecond();   }else if(tens==3){     threesecond();   }else if(tens==4){     foursecond();   }else if(tens==5){     fivesecond();   }else if(tens==6){     sixsecond();   }else if(tens==7){     sevensecond();   }else if(tens==8){     eightsecond();   }else if(tens==9){     ninesecond();   }       Serial.print(inches);   Serial.print(" in, ");   Serial.print(cm);   Serial.print(" cm, ");   Serial.print(Speed);   Serial.print(" mph");   Serial.println();     delay(100); }   long microsecondsToInches(long microseconds) {   // According to Parallax's datasheet for the PING))), there are   // 73.746 microseconds per inch (i.e. sound travels at 1130 feet per   // second).  This gives the distance travelled by the ping, outbound   // and return, so we divide by 2 to get the distance of the obstacle.   // See: http://www.parallax.com/dl/docs/prod/acc/28015-PING-v1.3.pdf   return microseconds / 74 / 2; }   long microsecondsToCentimeters(long microseconds) {   // The speed of sound is 340 m/s or 29 microseconds per centimeter.   // The ping travels out and back, so to find the distance of the   // object we take half of the distance travelled.   return microseconds / 29 / 2; } again, all your help and thought are appricated

Topic by herb1977   |  last reply


solar install question

Ok so I see a few solar setups online. now I have been researching for a while on this and no one can give me the answers so here i go on here. So i want an UPGRADE-ABLE solar setup. right now I have 2 150ah 12v batteries. I have multiple 50 amp charge controllers. so when I buy the solar panels I can plug in and get batteries going no problem.... My issue is the mains voltage side of things. I want to have something like a fuse box, this will have my main breaker and then the independent safety switches. the issue is to do this I need to make sure all my power is on 1 line. so if I buy a few small inverters I will not be able to piggyback them as they tend to go bang. so what type of inverter can I get that will be able to go in parrallel to allow me to get more amps if needed? I am hoping there is one that is infinitely upgradeable just in case. TLDR what type of off-grid inverter allows parrallel connection to other inverters??

Topic by plucas1   |  last reply


HDMI from LCD connector

Hi, At work I have an ultrasonic testing instrument that displays the signal on an LCD (640x480). I also have a HUD (head mounted display) that requires a HDMI input. The only way I can think of getting the 2 working is to put a camera over the display and send that to the HUD. Would anyone know of a way to connect something to the LCD ribbon directly and convert it to HDMI? Many thanks for any help provided.

Topic by mknorr   |  last reply


LED indicator for A/V selector

Hi! A while ago, i made an A/V selector, and it worked quite well. It had a small design issue, which is, having the ports at the front, where the switches are, and I want to upgrade it a little bit. The idea is, put on the front the switches with a LED on each input, and when I switch the selected input, the selected LED will also light. I've been looking around, and the A/V voltages are around 1 volt. The switch I have, it can handle 3 circuits at the same time (Video, Left and Right) but it has 3 rows as a conmutator or something. The thing is, i need your help in order to connect the LED. I've been thinking about using the unused row of the switch, but I don't know how, or, place a transistor when the Video input comes across the switch, but I don't know what kind of transistor will do. Thanks in advance I attach a diagram of what is now, with 5 inputs, showing only 2 of them, to have a brief idea

Topic by jimmytvf   |  last reply


circuit board repair question

This little audio input jack broke off a circuit board.  I'm wondering if anyone knows what I need to do to fix it? You can see that there are 4 metal connectors which I assume a soldiering iron can easily fix.  But there is also an orange strip that snapped off of the little orange baseball home plate-shaped tab on the bottom of the jack.  Does anyone know what that is and the best way to repair it?  (The loose strand is right by where it says "CN6" on the board) I don't know anything about circuitry but was going to borrow a friend's soldiering iron. Thanks to anyone who can point me in the right direction! Phillip

Topic by pmottern   |  last reply


Introducing the fastest, smartest and simplest way to code Arduino!

Hello Everyone! I would like to present a new website for coding Arduino: www.Cherpa.io This website allows users to code arduino online, but it has these cool new features: - Visualization: There's a dashboard where users can add visualization elements like a gauge, barmeter, graph to visualize data from arduino and controllers like buttons, sliders..to control the circuit and move servo motors for example. - Chatbot: A new chatbot is introduced to answer all electronics related questions. Its still new and learning every day. - Auto-complete for arduino. - You can upload and save your code online in your profile. Here is a video that demonstrates what im talking about: https://www.youtube.com/watch?v=mwTggv5V3Uw I would love to hear your thoughts, an any suggestions! Have a great day :D

Topic by IbrahimE16   |  last reply


Night vision surveillance

Hi, I made a surveillance system out of 2 cheap web cameras. It works perfect, but night is the problem. I need to make it possible to record during night. I can't buy some professional IR cameras right now, but I got new neighbor who makes problems, and he is the reason why I am doing this. I found in local shop some IR diodes "100pcs 5mm 940nm IR" which cost about 5€. Are they good for my needs? They have to cover about 5-6m outdoor. And can I use them for my cheap web cameras? Any suggestion is welcome, need your help, or soon my stuff around a house will disappear!

Topic by AdvanŽ   |  last reply


Analog and Digital Inputs for Teensy 3.2 MIDI Programming within Arduino

Been having some trouble with programming my custom potentiometers for my midi controller. I have 12 buttons and 6 knobs. I have it wired correctly and have the sanwa arcade buttons working fine. I'm just having a huge problem adding analog code to my digital code. I'm not sure where to go from here, I have tried over 20 different types of analog code and I'm not sure what I'm doing wrong. Just need a basic potentiometer for reading MIDI. I have the first 1-12 digital inputs on my teensy soldered in for my arcade buttons. For the analog potentiometers I have them soldered on inputs 18-23 or (A4 thru A9) on the Teensy 3.2. I am using Arduino software along with the Teensy loader. Any help would be greatly appreciated, thank you. Here is the code I have thus far. I only have the 19 and 23 analog inputs written in this one at the very end, because I removed the others.  ******** /* Buttons to USB MIDI Example    You must select MIDI from the "Tools > USB Type" menu    To view the raw MIDI data on Linux: aseqdump -p "Teensy MIDI"    This example code is in the public domain. */ #include // the MIDI channel number to send messages const int channel = 1; // Create Bounce objects for each button.  The Bounce object // automatically deals with contact chatter or "bounce", and // it makes detecting changes very simple. Bounce button1 = Bounce(1, 5);  // 5 = 5 ms debounce time Bounce button2 = Bounce(2, 5);  // which is appropriate for good Bounce button3 = Bounce(3, 5);  // quality mechanical pushbuttons Bounce button4 = Bounce(4, 5); Bounce button5 = Bounce(5, 5);  // if a button is too "sensitive" Bounce button6 = Bounce(6, 5);  // to rapid touch, you can Bounce button7 = Bounce(7, 5);  // increase this time. Bounce button8 = Bounce(8, 5); Bounce button9 = Bounce(9, 5); Bounce button10 = Bounce(10, 5); Bounce button11 = Bounce(11, 5); Bounce button12 = Bounce(12, 5); void setup() {   // Configure the pins for input mode with pullup resistors.   // The pushbuttons connect from each pin to ground.  When   // the button is pressed, the pin reads LOW because the button   // shorts it to ground.  When released, the pin reads HIGH   // because the pullup resistor connects to +5 volts inside   // the chip.  LOW for "on", and HIGH for "off" may seem   // backwards, but using the on-chip pullup resistors is very   // convenient.  The scheme is called "active low", and it's   // very commonly used in electronics... so much that the chip   // has built-in pullup resistors!   pinMode(1, INPUT_PULLUP);   pinMode(2, INPUT_PULLUP);   pinMode(3, INPUT_PULLUP);   pinMode(4, INPUT_PULLUP);   pinMode(5, INPUT_PULLUP);   pinMode(6, INPUT_PULLUP);  // Teensy++ 2.0 LED, may need 1k resistor pullup   pinMode(7, INPUT_PULLUP);   pinMode(8, INPUT_PULLUP);   pinMode(9, INPUT_PULLUP);   pinMode(10, INPUT_PULLUP);   pinMode(11, INPUT_PULLUP);   pinMode(12, INPUT_PULLUP);// Teensy 2.0 LED, may need 1k resistor pullup } void loop() {   // Update all the buttons.  There should not be any long   // delays in loop(), so this runs repetitively at a rate   // faster than the buttons could be pressed and released.   button1.update();   button2.update();   button3.update();   button4.update();   button5.update();   button6.update();   button7.update();   button8.update();   button9.update();   button10.update();   button11.update();   button12.update();   // Check each button for "falling" edge.   // Send a MIDI Note On message when each button presses   // Update the Joystick buttons only upon changes.   // falling = high (not pressed - voltage from pullup resistor)   //           to low (pressed - button connects pin to ground)   if (button1.fallingEdge()) {     usbMIDI.sendNoteOn(61, 99, channel);  // 61 = C#4   }   if (button2.fallingEdge()) {     usbMIDI.sendNoteOn(62, 99, channel);  // 62 = D4   }   if (button3.fallingEdge()) {     usbMIDI.sendNoteOn(63, 99, channel);  // 63 = D#4   }   if (button4.fallingEdge()) {     usbMIDI.sendNoteOn(64, 99, channel);  // 64 = E4   }   if (button5.fallingEdge()) {     usbMIDI.sendNoteOn(65, 99, channel);  // 65 = F4   }   if (button6.fallingEdge()) {     usbMIDI.sendNoteOn(66, 99, channel);  // 66 = F#4   }   if (button7.fallingEdge()) {     usbMIDI.sendNoteOn(67, 99, channel);  // 67 = G4   }   if (button8.fallingEdge()) {     usbMIDI.sendNoteOn(68, 99, channel);  // 68 = G#4   }   if (button9.fallingEdge()) {     usbMIDI.sendNoteOn(69, 99, channel);  // 69 = A5   }   if (button10.fallingEdge()) {     usbMIDI.sendNoteOn(70, 99, channel);  // 70 = A#5   }   if (button11.fallingEdge()) {     usbMIDI.sendNoteOn(71, 99, channel);  // 71 = B5   }   if (button12.fallingEdge()) {     usbMIDI.sendNoteOn(72, 99, channel);  // 72 = C4   // Check each button for "rising" edge   // Send a MIDI Note Off message when each button releases   // For many types of projects, you only care when the button   // is pressed and the release isn't needed.   // rising = low (pressed - button connects pin to ground)   //          to high (not pressed - voltage from pullup resistor)    }   if (button1.risingEdge()) {     usbMIDI.sendNoteOff(61, 0, channel);  // 61 = C#4   }   if (button2.risingEdge()) {     usbMIDI.sendNoteOff(62, 0, channel);  // 62 = D4   }   if (button3.risingEdge()) {     usbMIDI.sendNoteOff(63, 0, channel);  // 63 = D#4   }   if (button4.risingEdge()) {     usbMIDI.sendNoteOff(64, 0, channel);  // 64 = E4   }   if (button5.risingEdge()) {     usbMIDI.sendNoteOff(65, 0, channel);  // 65 = F4   }   if (button6.risingEdge()) {     usbMIDI.sendNoteOff(66, 0, channel);  // 66 = F#4   }   if (button7.risingEdge()) {     usbMIDI.sendNoteOff(67, 0, channel);  // 67 = G4   }   if (button8.risingEdge()) {     usbMIDI.sendNoteOff(68, 0, channel);  // 68 = G#4   }   if (button9.risingEdge()) {     usbMIDI.sendNoteOff(69, 0, channel);  // 69 = A5   }   if (button10.risingEdge()) {     usbMIDI.sendNoteOff(70, 0, channel);  // 70 = A#5   }   if (button11.risingEdge()) {     usbMIDI.sendNoteOff(71, 0, channel);  // 71 = B5   }   if (button12.risingEdge()) {     usbMIDI.sendNoteOff(72, 0, channel);  // 72 = C4   // MIDI Controllers should discard incoming MIDI messages.   // http://forum.pjrc.com/threads/24179-Teensy-3-Ableton-Analog-CC-causes-midi-crash   while (usbMIDI.read()) {     // ignore incoming messages   } } // read the input on analog pin 19:   int sensorValue = analogRead(A5);   // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):   float voltage = sensorValue * (5.0 / 1023.0);   // print out the value you read:   Serial.println(voltage); } // read the input on analog pin 23:   int sensorValue = analogRead(A9);   // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):   float voltage = sensorValue * (5.0 / 1023.0);   // print out the value you read:

Topic by abissmusic   |  last reply


Different Modes and Arduino?

Hello! I had a question.  I want to have like 5 buttons and every time I press one button it runs a certain block of code over and over until I press another button. This way I can have different modes etc. mode 1, mode 2. . . Can somebody help me with the code please? Thanks

Topic by HavocRC   |  last reply


Beginner Arduino Basic LCD + rotary encoders

New to Arduino, attempting to get basic programs working. Whats the best way to include multiple sensor readings to appear on a LCD Arduino screen for user feedback. So the sensor readout on the LCD would switch to the most recent change of rotation. Code to examine or help in the right direction would be appreciated. Thanks

Topic by Prime01   |  last reply


anyone teaching how to make coco peat shredder / separator machine?

Anyone teaching how to make coco peat shredder / separator machine? i saw a lot of video showing it off on youtube but no one is actually teaching it. i would really like to learn how to DIY one, since i like planting and stuff and need coco peat but it is quite expensive here.

Topic by MosesL6   |  last reply


Bearing/fulcrum for a pendulum

I want to swing a locket on a chain like a pendulum and I want to minmise the friction experienced where the chain attaches to the supporting post. What sort of bearing or similar device should I use for this? Ideally it should be available in a bronze/dirty brass colour but I guess I can deal with it if it isn't.

Topic by THX 1138   |  last reply


Sound tower not working - repurpose with Raspberry Pi?

My soundtower quit working. It powers on but no sound from an ipod or from component audio cables in the back.  Are the speakers themselves repurposable perhaps by removing the electronic boards and replacing with a Raspberry Pi?  If not, it's going to the dump.

Topic by mazelady   |  last reply


problems with adobe illustrator

Maybe someone faced with a similar problem. Worked with the file in Adobe Illustrator. In the process, wanted once again to save the file, put it on save, display a message about lack of memory, it was found that the working memory of 400 MB, although confident 20-15 GB is always there. Something went wrong. Closed a few programs opened and again put the file on save. actually tab of the file looked as if the file was successfully saved, closed it and Illustrator and set the computer to restart. After a reboot the file is not opened. Displayed a sign which read: "Cant open the illustration. Could not complete the requested operation" and when you click ok a blank space. Tell me , what do I do in this situation ?

Topic by timberhand   |  last reply


Simple question 230v to 12v 50w/5a timed output

Hi, know a lil about electronics and electrical just want to make sure i'm not being a dummy or if there are any other better alternatives. Problem: A timed output circuit has gone bang on an piece of work equipment, wont go into detail as it may confuse the situation but it all works apart form the timed lamp button, I can see components on the lamp circuit disintegrated etc... So I wish to make the lamp part sort of stand alone. plan is to convert a 230v suply down to 12v 5a as the lamp it needs to power is 50w. Resolution: I was going to get this https://www.amazon.co.uk/200-250V-Halogen-Light-Electronic-Transformer/dp/B00CXK30UW and http://www.ebay.co.uk/itm/DC-5V-12V-24V-Infinite-Loop-Cycle-Timing-Timer-Time-Delay-Relay-ON-OFF-Module-/192106941494 Build accordingly and place in a project box with a push button on the project box also. Can anyone see any issues with this? Or am I complicating it, maybe the transformer then this? http://www.ebay.co.uk/itm/CAR-TIMER-SWITCH-TIME-RELAY-DELAY-OFF-CAR-LIGHTS-UNIVERSAL-KIT-1-105s-10A-12V/271203168131?var=570157183343&_trkparms=aid%3D222007%26algo%3DSIM.MBE%26ao%3D2%26asc%3D46150%26meid%3D5e8c43f27aec4c1092baed675673ef1f%26pid%3D100005%26rk%3D6%26rkt%3D6%26sd%3D280890951562&_trksid=p2047675.c100005.m1851 or http://www.12voltplanet.co.uk/12v-universal-interior-light-delay-timer-relay-10-sec-delay.html any alternatives? advice?

Topic by TerryJ31   |  last reply


spec a dc motor for a vehicle

I am making an electric vehicle. Assume no friction on a flat surface. The vehicle will have two dc electric motors preferably 24v or 48v system as space is an issue(about 3.5 x 4 feet) one motor on each drive axle. The vehicle will weigh 2000lbs have a max speed of 10miles per hour be able to reach max speed in under 5 seconds overall wheel diameter will be 16 inches Can be geared down to attain needed torque but must go up to 10miles per hour. Please include formulas so I can at least know how to do this in the future. I need to know power, torque, rpm needed for electric motor. Thank you

Topic by tshaf   |  last reply


ESP8266 version 13 DIP switch

Hi, I bought a kit that uses an ESP8266 Arduino expansion board (shield) that has a version 13 ESP8266 module on it. That expansion board is not a standard ESP8266 board. It has an unusual 2-pole DIP switch on it that can be set to "ON" or "1-2". I need to understand what the 2-pole DP switch does and I need to understand the electrical connections it is connected to. There are many instructables about the standard ESP8266, but I cannot find any details about that DIP switch in a version 13 ESP8266 arduino expansion board. Can you please tell me where the DIP switch connects to and why it is needed. Thank you

Topic by agribot 


Upgraded a 12vac to 24vac z-wave thermostat for A/C unit also adding transformer???

I decided to install a Z-wave Thermostat after an old ordinary one failed to work, It worked fine with home automation and all, apart from it being 24vac thermostat but receiving only 12vac from the motherboard (I was forced to change the batteries every 3 months), To make life easier (and not have to change batteries) I ended up doing  the stupid thing tying to Upgrade from 12vac to 24vac adding a transformer, it worked fine for the first 5 mins and then stopped, it was then that I realised I may have overloaded the mother board, My question is, is there a quick fix for this? or do I have to replace the whole motherboard?, if so which one?

Topic by BozS1   |  last reply


Long Range UHF RFID Integrated Reader

Hi, I am Planning to develop Long Range UHF RFID Integrated Reader which can Read Multiple Tags at a time (range between 8- 15 Meters range) and send information to my web application to store data, so will you plese let me know the components which i need to use along with assembling process. Thankq

Topic by bikhanpersonal   |  last reply


DS3231

Arduino: 1.8.4 (Windows 10), Πλακέτα:"Arduino/Genuino Uno" Hello everybody I use Arduino R3 Uno with DS3231 and 1.8 TFT spi 128X160 and this is my first project. #include     #include #include #include #include // Init the DS3231 using the hardware interface DS3231  rtc(SDA, SCL); #define TFT_CS     10 #define TFT_RST    9  #define TFT_DC     8 #define TFT_SCLK 13   #define TFT_MOSI 11   Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS,  TFT_DC, TFT_RST); void setup(void) {   // Setup Serial connection   Serial.begin(115200);     // Initialize the rtc object   rtc.begin();   // You will need to do this in every sketch   tft.initR(INITR_BLACKTAB); // Blank Screen   tft.fillScreen(ST7735_BLACK); // Set background BLACK     // Start writing colored text tft.setTextColor(ST7735_RED);   tft.setTextSize(1);   tft.setCursor(5,10);   delay(1000);  // pause for dramatic effect   tft.print("1.8 TFT with DS3231"); } void loop() {   // Blank Screen   tft.initR(INITR_BLACKTAB);     // Send Day of Week   tft.setTextColor(ST7735_WHITE);   tft.setTextSize(2);   tft.setCursor(10,30);   tft.print(rtc.getDOWStr());     // Send date    tft.setTextColor(ST7735_WHITE);   tft.setTextSize(1);   tft.setCursor(10,50);   tft.print(rtc.getDateStr()); // Send time   tft.setTextColor(ST7735_WHITE);   tft.setTextSize(1);   tft.setCursor(10,70);   tft.println(rtc.getTimeStr());   // Send current temperature   tft.setTextColor(ST7735_YELLOW);   tft.setTextSize(1);   tft.setCursor(30,90);   tft.print("Temperature: ");     tft.setTextColor(ST7735_BLUE);   tft.setTextSize(2);   tft.setCursor(35,120);     tft.print(rtc.getTemp());   tft.println(" C"); } Clicking for compilation illuminates the line 8 DS3231  rtc(SDA, SCL); Software: arduino-1.8.4 windows 10 Libraries: DS3231 1.0.2 Libraries are up-to-date and when I ask to add again library DS3231 adds #include Please help. Where is the error? D:\Τα Ξ­Ξ³Ξ³Ο?αφά ΞΌΞΏΟ…\Arduino\@-NEW_Projects_OCT_2017\1.8TFT_with_DS3231\1.8TFT_with_DS3231.ino:8:21: note: candidates are: In file included from D:\Τα Ξ­Ξ³Ξ³Ο?αφά ΞΌΞΏΟ…\Arduino\@-NEW_Projects_OCT_2017\1.8TFT_with_DS3231\1.8TFT_with_DS3231.ino:4:0: D:\Τα έγγραφά μου\Arduino\libraries\DS3231/DS3231.h:64:3: note: DS3231::DS3231()    DS3231();    ^ D:\Τα έγγραφά μου\Arduino\libraries\DS3231/DS3231.h:64:3: note:   candidate expects 0 arguments, 2 provided D:\Τα έγγραφά μου\Arduino\libraries\DS3231/DS3231.h:60:7: note: constexpr DS3231::DS3231(const DS3231&) class DS3231 {        ^ D:\Τα έγγραφά μου\Arduino\libraries\DS3231/DS3231.h:60:7: note:   candidate expects 1 argument, 2 provided D:\Τα έγγραφά μου\Arduino\libraries\DS3231/DS3231.h:60:7: note: constexpr DS3231::DS3231(DS3231&&) D:\Τα έγγραφά μου\Arduino\libraries\DS3231/DS3231.h:60:7: note:   candidate expects 1 argument, 2 provided D:\Τα Ξ­Ξ³Ξ³Ο?αφά ΞΌΞΏΟ…\Arduino\@-NEW_Projects_OCT_2017\1.8TFT_with_DS3231\1.8TFT_with_DS3231.ino: In function 'void setup()': 1.8TFT_with_DS3231:24: error: 'class DS3231' has no member named 'begin' D:\Τα Ξ­Ξ³Ξ³Ο?αφά ΞΌΞΏΟ…\Arduino\@-NEW_Projects_OCT_2017\1.8TFT_with_DS3231\1.8TFT_with_DS3231.ino: In function 'void loop()': 1.8TFT_with_DS3231:47: error: 'class DS3231' has no member named 'getDOWStr' 1.8TFT_with_DS3231:53: error: 'class DS3231' has no member named 'getDateStr' 1.8TFT_with_DS3231:59: error: 'class DS3231' has no member named 'getTimeStr' 1.8TFT_with_DS3231:71: error: 'class DS3231' has no member named 'getTemp' Χρησιμοποιώντας την βιβλιοθήκη Adafruit-GFX-Library-master στην έκδοση 1.2.2 στον φάκελο: D:\Τα έγγραφά μου\Arduino\libraries\Adafruit-GFX-Library-master Χρησιμοποιώντας την βιβλιοθήκη Adafruit_ST3775 στον φάκελο: D:\Τα έγγραφά μου\Arduino\libraries\Adafruit_ST3775 (legacy) Χρησιμοποιώντας την βιβλιοθήκη SPI στην έκδοση 1.0 στον φάκελο: C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\SPI Χρησιμοποιώντας την βιβλιοθήκη DS3231 στην έκδοση 1.0.2 στον φάκελο: D:\Τα έγγραφά μου\Arduino\libraries\DS3231 Χρησιμοποιώντας την βιβλιοθήκη Wire στην έκδοση 1.0 στον φάκελο: C:\Program Files (x86)\Arduino\hardware\arduino\avr\libraries\Wire exit status 1 no matching function for call to 'DS3231::DS3231(const uint8_t&, const uint8_t&)'

Topic by BillyK11 


UPS battery backup as car inverter?

I hope this isn't a dumb question, but if I were to take an old UPS unit, remove the battery, wire a 12V lighter socket plug to the battery cables in the UPS, and plug it in to the car, would it convert the 12V DC to 120V AC while the car is running? And if it worked would it draw too much power or damage anything? I wouldn't use this to run anything with a motor, just a laptop charger and maybe a light. Thanks! :)

Topic by 500FPS   |  last reply