How can I recover data from a dead external hard drive?

I have a 2TB external hard drive with lots of stuff on it Recently it stopped working and now I cant access it I have tried it in many computers but they only ever find the SATA to usb bridge which connects the hard drive to the computer I have also tried some hard drive recovery programs, some of them find the hard drive but when they scan it, they find nothing Does anyone know of a good, working, reliable hard drive recovery program (free if possible) or any other way to get the stuff off of it Thanks

Question by Jareadx   |  last reply

PPowering 12 volt car radio with solar panel?

My friend has a bass boat that he wants to put a car radio into. However, the boat motor has no alternator or dynamo to charge the batteries. Is there a solar panel available that would keep the radio and two 6.5 inch speakers going on his boating trips. He is usually out 3-4 hours at most.

Question by ShawnI7   |  last reply

Whats is the full form of VKD, VDL, VKR in PVC Valves

Whats is the full form of VKD, VDL, VKR in PVC Valves.

Topic by rajkw   |  last reply

I need help with my arduino code, the error code is "stray #" . located at #define DO_NEXT 4

1.//iOS switch control example 2.//Simple version 3.#define MY_DEBUG 1 4.#include "BluefruitRoutines.h" 5. 6.//Pin numbers for switches 7.#define PREVIOUS_SWITCH A0 8.#define SELECT_SWITCH A1 9.#define NEXT_SWITCH A2 10. 11.//Actions 12.#define DO_PREVIOUS 1 13.#define DO_SELECT   2 14.#define DO_NEXT     4 15. 16.uint8_t readSwitches(void) { 17.  return (~(digitalRead(PREVIOUS_SWITCH)*DO_PREVIOUS 18.      + digitalRead(SELECT_SWITCH)*DO_SELECT 19.      + digitalRead (NEXT_SWITCH)*DO_NEXT) 20.     ) & (DO_PREVIOUS+ DO_SELECT+ DO_NEXT); 21.} 22. 23.//Translate character to keyboard keycode and transmit 24.void pressKeyCode (uint8_t c) { 25.  ble.print(F("AT+BLEKEYBOARDCODE=00-00-")); 26.  uint8_t Code=c-'a'+4; 27.  if (Code<0x10)ble.print("0"); 28.  ble.print(Code,HEX); 29.  ble.println(F("-00-00-00-00")); 30.  MESSAGE(F("Pressed.")); 31.  delay(100);//de-bounce 32.  while (readSwitches()) { //wait for button to be released 33.    /*do nothing*/ 34.  }; 35.  ble.println(F("AT+BLEKEYBOARDCODE=00-00")); 36.  MESSAGE(F("Released")); 37.} 38. 39.void setup() { 40.  if(MY_DEBUG) 41.  while (! Serial) {}; delay (500); 42.  Serial.begin(9600); Serial.println("Debug output"); 43.endif 44.  pinMode(SELECT_SWITCH, INPUT_PULLUP); 45.  pinMode(NEXT_SWITCH, INPUT_PULLUP); 46.  pinMode(PREVIOUS_SWITCH, INPUT_PULLUP); 47.  initializeBluefruit(); 48.} 49. 50.void loop() { 51.  uint8_t i=readSwitches(); 52.  switch (i) { 53.    case DO_PREVIOUS: pressKeyCode('p'); break; 54.    case DO_SELECT:   pressKeyCode('s'); break; 55.    case DO_NEXT:     pressKeyCode('n'); break; 56.  } 57.} void setup() {   // put your setup code here, to run once: } void loop() {   // put your main code here, to run repeatedly: }

Question by JacLir00179   |  last reply

Permanent Magnet Motor

I learned a couple of years ago about a motor developed by Nikolai Tesla that operates using neodymium magnets. If anyone has any information about this or other similar motors, please post information and help to save the earth from the evils of oil!

Topic by HazzardFan75   |  last reply

Anyone know how to make a freestanding sound-emitting device to stop a neighborhood barking dog?

My wife and I just purchased a home and we found out one of the neighbors have a couple dogs that bark all day and into the night. I suffer from migraines and these things are driving me crazy! We have talked to the owners very politely and they don't seem to care. I would love to make a freestanding sound-emitting device that I can direct in the directions of the neighbors fence. Can anyone point me to a instructable  or something that explains how to make one. I know I can buy one for like $75 but I would love to learn how to make one and maybe be able to have more control over how it's used. Any help would be greatly appreciated. Thanks. Going Crazy!

Question by Jester_boy2   |  last reply

Can someone help with my anti auto theft arduino device? I am trying to use a reed switch and a relay.

     I am trying to build a device for my engineering project which is a anti theft device for cargo trucks in third world countries. Since cargo stealing is very common truckers already use satellite tracking. The device works in the following way, in an attempt to steal the truck a thieve tries to breach into the truck"s electrics to disable the satellite tracking, but the reed switch detects the breach and the arduino stops feeding power to a relay which is connected truck's electronic fuel injection system, thus making the truck's engine to stop and consequently immobilizing the cargo.      The system uses a 4x4 matrix keypad, one relay(I might add more) and one reed switch but I am planning to use two. When the sensor is breached the arduino is supposed to cut power to the relay. If the correct password in entered in the keypad the system turns the relays on until the sensor is breached again, if the wrong password is entered it remains locked.      I managed to find a password code a guy shared which worked with the keypad and the relays, but when I try to add a if statement to lock when the sensor is breached it simply does not work. Thanks in advance for the help. #include int Relay1 = 13; int Relay2 = 12; int greenPin = 11; int Sensor1 = A1; int Sensor1Valor = analogRead(Sensor1); int position = 0; const char * password = "123"; const byte ROWS = 4; const byte COLS = 4; char keys[ROWS][COLS] = {   {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'} }; byte rowPins[ROWS] = { 8, 7, 6, 9 }; byte colPins[COLS] = { 5, 4, 3, 2 }; Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS ); void setup() { Serial.begin(9600); pinMode(Sensor1, INPUT); pinMode(Relay1, OUTPUT); pinMode(Relay2, OUTPUT); pinMode(greenPin, OUTPUT); digitalWrite(Relay1, HIGH); digitalWrite(Relay2, HIGH); setLocked(false); } void loop()  { char key = keypad.getKey(); Serial.println(analogRead(A1)); if (key == '*' || key == '#') { position = 0; setLocked(true); } if (key == password[position]) { position ++; } if (position == 3) { setLocked(false); } if (analogRead(A1) > 300); { setLocked(true); } } void setLocked(int locked) { if (locked) { digitalWrite(greenPin, LOW); digitalWrite(Relay1, LOW); digitalWrite(Relay2, LOW); } else { digitalWrite(greenPin, HIGH); digitalWrite(Relay1, HIGH); digitalWrite(Relay2, HIGH); } }

Question by LuccaL1   |  last reply

Etching and installing parts in shells?

So I'm trying to make a music box. I bought a 15 note hand crank mechanism I want to install into an 8 inch nautilus shell. I also want to etch the outside of the shell like in the photo. I've never worked with shells like this before and I obviously don't want to shatter it. What tools would I need to do this? What should I be careful of? Anyone with experience working with shells advice would be appreciated. :)

Question by Swansong   |  last reply

How do I cancel my subscription?

I got an email yesterday to say that I had paid my subscription for this year.  I know I probably agreed to an automatic payment when I signed up for this, but I want to change it now. can anyone tell me how?

Question by GeorgeW64   |  last reply

Has anyone tried to decipher the signals used to trigger restaurant pagers?

Know those wireless pagers that restaurants hand out? I think they're called guest alert, host alert or serv alert. Something like that. There's got to be a way to trigger those whenever you want rather than when the restaurant wants, right? Has anyone considered using a PLC & Bluetooth to do this?

Question by kkinney   |  last reply


What does vaule mean in variables? For example: int Led=13; what does 13 represent?

Topic by 1457854Mac   |  last reply

Please help me identify this tool?

This is driving me insane, please help me identify this tool!  We found this tool in my father workshops and we have no clue what it is. 

Question by PetarS7   |  last reply

Looking for a 5V valve to be driven by ARDUINO

Hi everybody, I am working on a project to make an automatic watering system driven by arduino. I am looking for a valve which I could operate without any extra power supply but the 5V from the ARDUINO. It would be perfect if the valve could be in the range of the 6mm for tubes connections. As my project will rely on gravity for water movements, I don't want to use a pump or whatever active device. Just some standard batteries connected to ARDUINO. Do some of you know such a valve? I have looked on the net without any success. I have found loads of watering projects using arduino but none with the same phylosphy. If you know one, please let me know. Regards,

Topic by BaptisteL8   |  last reply

Van de graff generator belt and roller? Answered

Hello friends i am from india i want to make a van de graff generator from scraths i can not find a wide rubberband can i use a pvc tubing as belt? pls suggest me some material for  belt and roller ! thanks in advanced

Question by mihir.sahu.355   |  last reply

Lacquer or Varnish to finish a guitar?

Hi, I've just had an artist do some work on one of my acoustic guitars. Its done straight onto the sanded bare wood using sharpie, all I have to do is give it a finish to stop the design getting damaged and to give it a glossy shine. A lot of people recommend Lacquer but what type should I use? Nitrocellulose? Poly? Others say Varnish but I've heard it can become tarnished from sweat and heat. This coat needs to stay on indefinitely as I cant sand it down again to apply a new coat without removing the art. Please help!

Question by Boba Jett   |  last reply

Safe Room

Does anyone have any good plans or ideas for a safe room built in a closet or at least how to build reinforced concrete walls?

Topic by opsmrs   |  last reply

Recovery Fund for a Young Maker and Instructables Author

Young maker and Instructables author Joey Hudy (lookwhatjoeysmaking) was recently diagnosed with Schizophrenia, as explained by his sister Elizabeth on a gofundme page set up to help assist his pathway forward, found here: Please take a moment to read his story, and donate if you are able. On behalf of the entire Instructables Family: Joey, we wish you the very best going forward! Thank you everyone!

Topic by seamster 

Problem driving a stepper motor using the A4988 reprap driver board and an Arduino? Answered

Hi guys I am having a problem driving a stepper motor using the A4988 reprap driver board and an Arduino I have set up the wiring using an example I found online (Diagram attached: A4988 wiring) However the motor does not seem to turn. The motor I am using is from an old Hitachi printer which I took apart a while back. Printed on it is 0.9A/ph. It has six wires however I am using it as a bipolar stepper by just leaving the center tap of each winding unconnected. I have adjusted the VREF on the A4988 board to insure that the current is limited bellow the 0.9A. To do this I used the data sheet of the A4988. As I wanted to run the motor at full step mode, the A4988 data sheet specifies that the winding current could only reach 70 percent of the current limit. consequently: Current limit = 0.9 * 0.7 = 0.63A Current limit = Vref * 2, Therefor Vref = 0.63/2 = 0.315V or 315mV I have therefor set the current limit using the potentiometer on the A4988 to aprox 315mV Once the wiring was set up, I applied power and measured the Vref to confirm it is still the same and it was. Next I disconnected the Power to both the Arduino and the driver and connected in the stepper motor. I then connected the power and uploaded the following code: // defines pins numbers const int stepPin = 3; const int dirPin = 4; void setup() { // Sets the two pins as Outputs pinMode(stepPin,OUTPUT); pinMode(dirPin,OUTPUT); } void loop() { digitalWrite(dirPin,HIGH); // Enables the motor to move in a particular direction // Makes 200 pulses for making one full cycle rotation for(int x = 0; x < 200; x++) { digitalWrite(stepPin,HIGH); delayMicroseconds(500); digitalWrite(stepPin,LOW); delayMicroseconds(500); } delay(5000); // five second delay digitalWrite(dirPin,LOW); //Changes the rotations direction // Makes 400 pulses for making two full cycle rotation for(int x = 0; x < 400; x++) { digitalWrite(stepPin,HIGH); delayMicroseconds(500); digitalWrite(stepPin,LOW); delayMicroseconds(500); } delay(5000); } Nothing happened... started off with 5 volts on the power supply and ramped it up to aprox 12vs however still nothing happened. I can feel the heat sink heating up on the A4988 which means power was reaching it. I measured the voltages from the Arduino to the A4988 and the power supply to the driver and the voltages matched the input. I started shaking about the power connections to and suddenly the motor made one step, but that was it. So i thought it was a problem with the breadboard. I checked the connections on the breadboard and all where connected. To be safe i decided to use another breadbord. Again nothing happened. I checked the Aarduino using the 28byj48 and UNL203 driver and stepper that came with it and they worked fine. I confirmed the wiring sequences and layout multiple times and they all matched the tutorial I followed. My inital thinking was that the stepper motor was broken, so i disconnected it and tried running it using the power supple (5V) by connecting and disconnecting each coil in manually one by one, and it turned one step at a time, which meant that the stepper was working. Finally i decided to see if current was reaching the stepper, I therefore connected the Altimeter in series with one of the coils and it did not read any current, which meant that current was not reaching the coils. Now I am unsure what to do, or what has gone wrong. The vref still reads aprox 310 - 320 mV, this makes me assume that driver is not fried. I do have another A4988 driver however I started working on that one and now the Vref does not go above 62mV so I'm guessing that it is burnt, however the second one reads fine. I have tried using the enable button with the following code (Attached; A4988 wiring 2) however it still didnt' make in difference. The following code is what i used for when I set the enabled to low (Note that the pin numbers have been changed) int Index; void setup() { pinMode(4, OUTPUT); //Enable pinMode(2, OUTPUT); //Step pinMode(3, OUTPUT); //Direction digitalWrite(4,LOW); } void loop() { digitalWrite(3,HIGH); for(Index = 0; Index < 2000; Index++) { digitalWrite(2,HIGH); delayMicroseconds(500); digitalWrite(2,LOW); delayMicroseconds(500); } delay(1000); digitalWrite(3,LOW); for(Index = 0; Index < 2000; Index++) { digitalWrite(2,HIGH); delayMicroseconds(500); digitalWrite(2,LOW); delayMicroseconds(500); } delay(1000); } Why did the motors initially step (only one step upon each shake) when I shook the power supply leads? I am afraid to try that again as I think this is what damaged the first driver I was using. And why is there no current reaching the coils? I would really appreciate an opinion on this issue as I have no idea what to do Many thanks for you time. Adnan

Question by k1228438   |  last reply

Gs to Speed Converstion

I am looking for the math equation that converts G load to speed using Arduino (  I am building a high power rocket data logger/controller. I need to know the speed by using accelerate of the bird. Yes I might be able to use GPS info, but at super sonic speed GPS can not keep track of the speed. The bird is a 2 stage bird. I want to stage when about 40% of the speed has bleed off.  Thanks Rocket Nut

Topic by Rocket Nut   |  last reply

LED Wiring Question

Prologue:  Please be gentle...once I get past V=IR and the "right-hand" rule, I'm lost to electronics.  But I can solder and follow a schematic. I have several (7) LED sets (each set = 10 LEDs with power pack containing 2 AA batteries, switch, and resistor).  Each set of LEDs are all the same color (if that makes a difference). Image attached. Question:  Is there a way to connect all LED sets to operate with a single switch and maintain each set with it's own power supply? On a lighter note, I'm building a project for some pre-schoolers and want to hide all wiring and switches from those "inquiring minds" and "wandering" hands. Thx in advance. Paul D

Topic by PDevline 

How to create 120 VAC to 90 VDC Power Supply?

I need to create a 90 Volt DC Power Supply using a capacity, toroid and bridge rectifier. I know that with a toroid you have a primary (input) voltage and then you'll conserve power but have a different secondary (output) voltage. I know that if you put say 120 VAC in the primary, the outputs might be, for example, 50 Volts out, which are also AC. I want the voltage to be DC, so I know that I need a bridge rectifier that will boost the voltage by 1.41 because of the AC to DC conversion. However, you also need a big fat capacitor, and I have no idea how to size and select this. Help?

Question by Matt Adams   |  last reply

How to connect 10W led + 12v Led Driver directly onto Arduino?

Hello there, can anyone give me an advice on connecting an 10W led + 12 volt drive to an Arduino Uno? it works but when i tried to connect to Uno it doesn't work anymore. Thankyou

Question by YuT6   |  last reply

How do i create a class?

I want to create a class to teach people about fnaf or something. How do i do it?

Question by CavemanHoles   |  last reply

How to build a 12v to 5v conversor with a zener?

I'm developing a shield for my Arduino Uno and I want to add in it an external power supply. The power source I want to plug in it has four connectors: 5v, gnd, gnd and 12v. The 5v and the gnd pin goes to their respective pins in Arduino, while the 12v pin goes to a 7805 on the shield or to Vin, and the selection is made with a jumper. The only problem is that the connector can be plugged inverted, swapping 5v and 12, which would damage the AT mega. I know zener diodes are useful for limiting power, but I don't know how to use it. I need a simple circuit in which I can plug my 5v supply and it gets 5v to the chip, and in case I plug the connector inverted, to limit its power to 5v to prevent damage or to shut down the power. I can’t use the 7805 on both pins, because it would deliver something like 4v or less if powered with 5v. And something like a led to indicate that the connector is at a wrong position would be nice too. Thank you.

Question by senitram   |  last reply

Rewinding a MOT to make a high current supply. Answered

New Question: Ok, I've done a little more research on this, and it seems that MOTs are just pieces of junk basically. Manufacturers design them to go far into saturation because they don't care how much electrical power is wasted, as long as the transformer is cheap to make. The air gap is probably there just so it's easier to cool with a fan. Now I need to bring this thing out of saturation. There are about 90 turns on this primary, which I want to be the secondary at 30 V. So I would have to wind a new primary with 360 turns of thin wire. That's a lot of work, and a lot of wire. Is it worth it? The other option would be to add turns to the existing primary. This seems more reasonable, but just how much would I need to use to bring it out of saturation? Original Question: So, I'm a physicist (in training) and I know the theory behind transformers, but actual transformers are still pretty mysterious to me. I've found quite a few Instructables and other sites related to MOTs, specifically related to making high current power supplies with them. The problem I'm having is that even when the secondary is open, and indeed when the secondary has been completely removed (and the shunts removed), the primary draws upwards of 10A when connected to mains. To me, this is unacceptable. Transformers should draw significant power only when current is drawn from the secondary. I'm trying to figure out why (specifically) it does this. I've got a variac and the transformer only begins drawing more than about 2 amps once the variac is set to about 90V. This seems like non-ideal behavior to me, but what I know about saturation tells me that the amount of steel the core has is more than enough to stave off saturation at open secondary, but I could be wrong. The only thing I can think of is that the primary coil has about a 1cm air gap on either side of the core. Since the efficiency is related to the magnetic flux, and I'm guessing the area of the air gap is roughly 1/5 of the area of the core, this could cause significant inefficiency. Here's what I want: I want to make a ~30V (possibly with multiple taps) high current supply out of this MOT that draws less than 1 amp when the secondary is open. I tried connecting the mains to the secondary before I removed that and I got about 5 volts on the primary, but I need more than that, and the windings were so saturated with resin I had to just remove the entire secondary. I'm thinking about winding a new primary (using the old primary as the new secondary) with something like 18 gauge wire that would give me 30V. Would this work? What I really need to know is why the existing primary is drawing 10 amps. That's just ridiculous. If I can solve that then the problem is easy. Update: There is a difference between resistive and reactive current, and I know that reactive current actually draws net zero power because it's 90 degrees out of phase with the source voltage. Capacitive and inductive loads do this apparently. Is this the reason for the massive current draw? If so, I might be able to minimize the current draw from the mains line by putting a matched capacitor in parallel with the primary. But this wouldn't stop the transformer from heating up.

Question by laserjocky   |  last reply

My key word is not working and can u help?

When I try to publish my instructable, it says enter keywords. I did! At least 2! What do I do?

Question by CavemanHoles   |  last reply

When loading pages or just reloading them it takes forever and a bit longer to finnish, that is if the loading actually finnishes. Everytime the site hangs at which is getting a bit annoying after two days in a row. Also, when posting comments or such the bottom part where you upload images is messed up. The two lines reading Tip: Select multiple files using Ctrl (mac: Cmd) or Shift key. Is this uploader not working for you? Try the old uploader. Are priinted on top of each partially.

Topic by Downunder35m   |  last reply

How do i start a class on instructables?

I want to start a kawaii class but i don't know how.

Question by CavemanHoles   |  last reply

Join the Drawing & Art group!

Hey everyone! My name is Renée and I love to draw. If you haven't already, feel free to submit your art instructables to the group! Let's make more stuff and share our techniques. You can add your art themed instructable by clicking on this button in the sidebar:

Topic by ReneediCherri   |  last reply

Help regard ESP 8266 or HC 05? Answered

Hi guys! :3 So I'm in need of some help regarding this project According to the project, you need to reprogram the robot for every function but it would be very tedious and time consuming to program it again and again. So, I thought that it would be nice to use a HC 05 or ESP 8266 (along with arduino) with a program to control whether it's walking, kicking or dancing etc. so I could control it through my mobile. The problem is that I have zero skills on developing software for the mobile, arduino or esp. I would love it if anyone could help me by making a small program. Also, would it be better to use the Bluetooth module or ESP? I would prefer ESP as it's cheaper but not by alot so if the Bluetooth module has benefits, I can buy that. Thanks in advance. :)

Question by SA-DIY   |  last reply

Any quick way to "loosen" Tamper Resistant outlets?

Back from the store with ten Tamper Resistant outlets.  I have great difficulty plugging anything into them completely.  I have great difficulty unplugging anything from them.   Is there something I can spray into them to make them open more easily?   Can I rig something to pound into them to loosen them with one whack?   We're putting in more than 100 outlets.  I'm old.  I want to be able to plug things in during my lifetime. "Oh they'll loosen up with use"  just doesn't cut it for anyone with arthritic  hands.   Short of moving, or replacing them after inspection, what can I do?

Question by mole1   |  last reply

I need a DC or AC motor of 100 Watt output running at 20,000rpm ?

For a very special purpose, we require a motor with the said requirement. Please help me how and where I can find such motor? Thanks

Question by shreyansk   |  last reply

USB adafruit trinklet mini > AC voltage regulator ~5W/230v motor?

​ hi folks.. i have this little project running..   what i have: adafruit trinklet mini with 5v ATMEL microcontroller   what i want/need: REGUALTE a small 5w MOTOR using 230v ! (i already have a mechanical potentiometer at 30k ohm attached directly AC.. BUT..)   i know so far with the atmel i can f.ex. control a digital potentimeter 50k ohm, at 5v.. -> only DC no AC (+ i wont get a 1Ampere on 5V working) ------> my little MOTOR uses ~ 22mA on 230V = 5W    and what ive learned so far is that i might need one or two TRIAC or DAC combined with a POTENTIOMETER.. to control AC voltage and/ or an OPTO-ISOLATOR --never heared of that before..   but i have no idea how i should solder that together or will i need some extra RESITORS or CAPACITORS for it?   -> FINALLY i want to flash the ATMEL with a small arduino code and use a USB connection (+own software) pushing the potenial (resistance in the curciut) from 0 to 50k ohm into AC !

Question by sblocc10   |  last reply

How to make a simple circuit, that has two unidirectional microphones?

I need to make a wearable headband which has two microphones at either side of the head. I know that i need a battery and two electret microphones and a lily pad??? but i don't know what else. it needs to be extremely simple. and i need someone to show me how to put it together, like an easy to follow drawing with all the parts clearly labelled. I will be recording alot so it needs to store at least 10 mins worth of recordings. Do i need another device for that? would i be able to upload that audio to a computer too?

Question by PenelopeS6   |  last reply

How to make circuit with two microphones?

I need to make a wearable headband that has a microphone by each ear that will record everything that is going on around a person. I don't know what else i might need. I need someone to tell me exactly what i need and how to construct it. drawings might be good. thank youuuuu

Question by PenelopeS6   |  last reply

how the measure pressure? Answered

I have a bag of certain gel and anther bag of silicon they are mall in size . i want to know the pressure  of these tow bag  can you please help me 

Question by lina mohammed   |  last reply

My pc won't connect to my wifi although I can still see it on my list, but everything else will connect to it

I bought an built pc from 3 years ago, and my buddy gave me a wireless adapter that he had had. I used to be able to connect without problem for a long time, but here recently I've been busy with work and all and haven't had time to get on it, but when I have been able to I cannot connect to my wifi although I can see it listed that I can. I've ran the troubleshooting thing and it says problem with wireless adapter or access point detected, I've tried multiple thing to fix it but to no evail nothing has worked, please help me 

Question by Jcorb24   |  last reply

How to fix computer that won't turn on after power surge?

Recently we had some heavy rain and I had a few things blow out, including router, modem, desktop, and a few other things. But the question here is regarding the desktop that will not turn on after this storm and apparent power surge.  When I hit the power button, nothing happens. I bought a new power supply and it turns on again with only one problem. All the colors on my monitor display are very washed out and faded. I plugged the monitor into another working computer and it works fine so I know the problem isn't the monitor. The power supply unit that I purchased isn't exactly the same as the original since the original is a little old and hard to come by. So my question is what can I do to get my computer working like it used to be? The operating system is Windows Vista Home Premium and it is a Dell Studio XPS desktop. What do I need to replace to get my display working properly? If anyone can help me answer this it is much appreciated.

Question by Science102   |  last reply

Why do prints on Repetier Host not start, when manual heating and motor controls work?

I am running a RAMPS board Prusa i3 on the newest version of Repetier Host, and everything worked fine on the last computer I had. I set Repetier up on a new computer, and everything functions as it should except that when I try to start a print, it says a print is in progress, but it's not printing. The stop/pause buttons are there as if a print is in progress, the bottom right corner forever says its printing layer 0, and the manual control window does not show a print in progress. Testing has indicated that the motors and heaters respond correctly when using manual controls, so the problem isn't the connection, baud rate, etc. Nothing was changed in terms of the hardware or firmware of the printer itself. The print runs fine using the virtual printer simulation. I also tried deselecting the box for "check extruder and bed temperature". Does anyone know what would cause the print to fail to start?

Question by AmpOwl   |  last reply

Simple wireless remote switch

Hi all, Long time fan off the site. Just wanting to verify this a concept before buying and building. current situation, looking for a wireless switch solution for a X-ray generator: Machine has a 2 stage switch 1st depress is prep 2nd depress fire. switch is wired with standard telephone cable red and black common. yellow prep  green fire I think the product linked(sorry if not allowed) will do the trick? It has configuration for momentary connection so function would have to be hold a button then when ready hold b button Any issues with this?

Topic by TerryJ31   |  last reply

Classes and setting buttons broken?

When on my profile page, I see three options near the top, just under my picture: Profile, Classes, and Settings.  Below those are what seems to be a feed, perhaps, with only one item that says I joined instructables.  When it first loads, Profile is highlighted.  If I click on Classes or Settings, something seems to load, but I still see the same feed - no classes, no settings. In order to get back to a class I had started previously, I had navigate to it by browsing classes. This seems like a bug, but if there's something I'm doing wrong please let me know. Thanks, Steve  

Topic by prsteve27 

Calculating notes of twanged strips Answered

Consider a twanged metal ruler, or the "keys" of a thumb piano (kalimba)... I'm in the middle of designing A Thing, and I am sure that there ought to be a way of calculating the note produced when you twang the end of a strip of metal. Assuming I know the Young's modulus, length, width & thickness of a strip of metal (rectangular cross-section), is there a formula into which I can plug these numbers and predict the note produced? Or are there other properties I need to know?

Question by Kiteman   |  last reply

Which Boost/buck converter? LTC3780 vs LM2577S LM2596S

Hi, brought two boost buck converters to build a bench power supply from a atx psu.  Brought the LM version first as i have read previously that these are quite efficient, then seen the LTC one, so thought i might as well buy that as well.  Looks like the LTC board will be able to go down to lower voltages and appears to have a greater efficiency, quoted up too 98%, compared with the LM's at around 80%. Thou i understand that with adjustments changes efficncey.  LM2577S LM2596S;=STRK%3AMEBIDX%3AIT LTC3780;=STRK%3AMEBIDX%3AIT Which one do you think i should use? Regards

Topic by JonathanM221   |  last reply


I am making a micromouse and want integrate the encoders using the fuction interrupt with the Arduino UNO. The encoders are from parallax; Boe-Bot Digital Encoder Kit. Know how programed using instruction of interrup.

Topic by gabon   |  last reply

how to drive a motor usin arduino without a motor shield? Answered

Is it possible to drive motor without a motor shield and if so do you know any good tutorials on  the subject

Question by lj123456   |  last reply

What is this tiny double-walled china dish for? Answered

I bought this at a junk store, and I'm totally baffled as to it's purpose. The small hole in the bottom opens into a small cavity, which is connected to that spout thing on the side. The majoriy of the botton cyliner apears to be hollow.

Question by nepheron   |  last reply

12V one 1 Channel Relay Module With optocoupler ?

Hello, I bought this 12V one 1 Channel Relay Module With optocoupler by mistake. And I can't figure out how to use it : I was supposed to buy a 5v relay to use it with a nodemcu. But on this one I can't understand the pins. Can someone help ? Thanks.

Question by RobinT15   |  last reply

security system (not responding after combining ultrasonic sensor code and esp8266 code )

The base of this project is &http;:// I changed according to my uses from above links I tryed by dividing into two parts one for ultrasonic sensor and other for esp8266 they worked fine while separating ultrasonic and buzzer are working in (Tools and wifi module is working in onlt(Tools when i mix ultrasonic and buzzer nothing happening) any idea here is the code #include #include #include #include #define USE_SERIAL Serial #define trigPin 9 #define echoPin 10 #define piezoPin 8 ESP8266WiFiMulti WiFiMulti; int normalDistance; boolean triggered = false; long duration, distance; void setup() {   USE_SERIAL.begin(115200);   pinMode(trigPin, OUTPUT);   pinMode(echoPin, INPUT);   pinMode(piezoPin, OUTPUT);   long duration, distance; while (millis() < 5000) {   digitalWrite(piezoPin, HIGH);       digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance= duration*0.034/2;         normalDistance = distance;       USE_SERIAL.print("Distance: "); USE_SERIAL.println(distance);         digitalWrite(piezoPin, LOW);    for(uint8_t t = 4; t > 0; t--) {         USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);         USE_SERIAL.flush();         delay(1000); } WiFiMulti.addAP("username", "pass"); } } void loop() { digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance= duration*0.034/2; USE_SERIAL.print("Distance: "); USE_SERIAL.println(distance); if (distance < normalDistance-5) {       triggered = true;     }     else {         triggered = false;     }     if (triggered) {     tone(piezoPin, 635);     delay(500);     tone(piezoPin, 912);     delay(250);     if(( == WL_CONNECTED)) {         HTTPClient http;         USE_SERIAL.print("[HTTP] begin...\n");                 http.begin("iftt link.........................."); //HTTP         USE_SERIAL.print("[HTTP] GET...\n");         // start connection and send HTTP header         int httpCode = http.GET();         // httpCode will be negative on error         if(httpCode > 0) {             // HTTP header has been send and Server response header has been handled             USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);             // file found at server             if(httpCode == HTTP_CODE_OK) {                 String payload = http.getString();                 USE_SERIAL.println(payload);             }         } else {             USE_SERIAL.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());         }         http.end();     }     } } any idea about whats going on Thanks Hemanth

Topic by hemanth kumar reddy   |  last reply

Lamp class lessons not working

Hi, I am having troubles with two lessons in one class (The Lamps Class). When I am logged in I can see and complete all of the other lessons but when I look at lesson 8 or 9 the website makes it seem like I am not logged in (my profile disappears from the upper right hand corner of the page) and so I cannot complete the lesson. This problem only happens on lesson 8 and 9 of the Lamps class but I have not seen this problem in other classes or other pages. My browser is Google Chrome(Version 56.0.2924.87) which I am running on a 32bit Windows 7 system. Thank you, Justin

Topic by Justin Tyler Tate   |  last reply