### 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 1 year ago  |  last reply 1 year ago

### Single Piston Air engine

Hi all, need help/ advice in designing a single piston air engine, It is part of a mechanical engineering course I am currently studying, the only parameters i was given are - Single cylinder with vertically displaced piston with rotation of the input shaft on a horizontal axis - free standing with an operating envelope of 300mm x 300mm x 300mm - accommodate a nominal piston diameter of 20mm - engine capacity of 6.0cc / 6000mm (cubed) Any help would be greatly appreciated Thanks in advance

Topic by DavidO242 1 year ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### Musical Parrot Toy

Serious request... my Parrot (African Grey) loves music. I would like to buy/build 'Parrot-proof' musical 'instrument/s' device/s that he can play, perhaps triggered by either percussive impulses from his beak and/or his vocal range. This would help him remain stimulated when I am out. All genuine replies welcome... :) The closest thing available is this, but it isn't very versatile (only pre set sounds) + not very musical  http://www.petsathome.com/shop/en/pets/bird-toys/jm-bird-babble-ball?pageSize=45&orderBy=1#

Topic by ParrotFX 2 years ago  |  last reply 1 year ago

### Post your best jokes here!!!

Whoever posts the best damn joke there is (judged by me) will win a free patch.(not a huge prize, but I hope you still try) Note: The jokes should be appropriate, with no bad language. (8+) The comp has been won! ilpug won with his hilarious panda joke! I hope you all enjoyed each others jokes!

Topic by HMice 6 years ago  |  last reply 1 year ago

### WTF!

Ok So I tried to get into instructables today but instead got this crazy robot game. As you can see my high score is 0, 1 can you beat my score?

Topic by liquidhandwash 1 year ago  |  last reply 1 year ago

### Am I the first to ask a question ?

LOOOOOL Checked the recent answers and got this picture... Seems our code monkeys are doing overtime. I really hope we did not loose all the answere here ;)

Topic by Downunder35m 1 year ago  |  last reply 1 year ago

### I keep feeling like I'm out of place in group calls

Whenever I get into a group call on Discord or something, I just get the nagging feeling that I don't belong in some way. Like, I may feel that people aren't acknowledging my presence, or that they don't really care to talk towards me. Am I the only one who keeps feeling something like this, in these situations? And, what can I do about it?

Topic by Dashing Rainbow Dash 2 years ago  |  last reply 1 year ago

### judging(how much TIME JUDGING takes)

Does any one know how much time judging takes when voting is finished

Topic by hadi141 1 year ago  |  last reply 1 year ago

Is anyone interested in doing a gift exchange? like exchanging random thingamajigs you've built or something.

Topic by bravoechonovember1 1 year ago  |  last reply 1 year ago

### Arduino D1 WeMos with LabView

Hey, I want to build a project that gets information from the "Temp102" sensor connected to the D1 WeMos Board. This board sends the information received from the sensor via WiFi. I want this information that sends to the computer that has the LabView software and it will display the temperature in a termometer. I have a program that I found in one of the sites that does what I want but with one problem! The program is written for module Esp8266, which is connected to board Arduino Uno and therefore has different classics. I need help converting the classics of module ESP8266 to relevant classes for Board D1 WeMos (This board has ESP8266 but it is built-in so there is no need to set it up in the program). It's important to note that I tried to change it and make a "mix" but without success. I would be happy if someone could check in the program what should be changed, which orders should be replaced? (I believe it's 2 minutes work for anyone who knows) Thank you very much for your help ! I appreciate you very much !! I attached the programs (for arduino and for labview).

Topic by OriaA 1 year ago  |  last reply 1 year ago

### Circuit to flash a bank of lights

I have a bank of 30 x 6 volt lamps in an old computer console and I am trying to find a circuit to flash them in a random pattern. Ideally the lamps will be driven from a chip rather than individual transistors. I'm perfectly capable of building the circuit, but not designing it. Can anyone point me in the right direction please? Thank you.

Topic by nickpb 1 year ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### Instructables needs a Fitness category

I was browsing and thought that we really need a fitness category or contest because instructables is really about making stuff and and a huge part of fitness is making stuff to maintain health.

Topic by jcsuperman 6 years ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### How to Clean Silt from Dug Round Water Wells Used by 3-4 Billion People on Planet?

This is a clam shell bucket, from an old toy crane. I am taking this to a machine shop, welder, had having them make it 18 inches wide. It would be used only with rope, no block and tackle.  Problem: As best I can surmise, about 1-10 percent of hand dug, round water wells used by around 4 billion people on the planet are full of silt, dirty, and old plastic jugs used to pull the water up from well. As the silt rises in the well, the wells slowly become too dirty, or the locals need to pull the water out in buckets, then allow the silt water to settle. It is way to expensive for people who earn 10 USD per day to pay people with pumps to drain the wells. I want to create a 1-2 man powered clamshell bucket system to clean these wells.  What is the best way to make a method to clean a dug well? How much would the steel, rebar cost? Labor is 10 dollars per day in central American, South America, Africa etc. Thanks for help, I will take the finished bucket to Lome, Togo West Africa to test, and modify, iterate. Andy Lee Graham of HoboTraveler.com https://www.hobotraveler.com/blogger.html

Topic by hobotraveler 1 year ago  |  last reply 1 year ago

### 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 10 years ago  |  last reply 1 year ago

### Motor assisted pedal powered rail rider

I am trying to build a 2 person human powered Vehicle that is also motor assisted, I need a way 2 people can pedal at diffrent speeds and drive the same axle. What I think I need is some sort of differential gearbox. What Ii need to know is: Is there is a differential that can take 2 different input speeds and have one output? If it did and I also pushed it with a motor would the wheels spinning feed back though the gearbox and send the pedals spinning like crazy? Any help or advice people can offer would be great.

Topic by BillP55 1 year ago  |  last reply 1 year ago

### Favorite Sport/Team

Topic by shadowninja31 10 years ago  |  last reply 1 year ago

### What do you love about Instructables?

I am a huge fan of Instructables and am curious why other people enjoy it so much. I believe it is important to tell others, how their hard work has been appreciated. Most of the time we tell people what we don't like about something. I have been a member of other sites like utube and blogs but I have stuck with Instructables because it has offered me an outlet to share what I make and connect with others. I like the fact that if we publish a good Instructable we get featured and that is a great way to get exposure. Their contest can be challenging as well as fun. I believe they try very hard to listen to their readers and authors. It is not just the Instructables team that make this such a great place but our readers are important as well. I have found most of the people here are kind and respectful. Please share your positive comments with me about why you love Instructables. Thanks for sharing your thoughts! Sunshiine

Topic by sunshiine 7 years ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### 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 3 years ago  |  last reply 1 year ago

### need help with coding for the interactive table designed by grahmaustin

Topic by CulturalC 1 year ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### gotta admit, kinda bummed by contest results

I recently entered a contest with what I thought was a good project. I'm no wizz and surely expect there to be strong competitors out there all with different projects. I have no idea what criteria is used in judging but to have several versions of the same thing (a bluetooth speaker) win several slots in the contest left me both bummed and scratching my head. What's done is done but I feel like this is akin to running a contest of car repair and having 3 entries on How to Change a Tire win.

Topic by ke4mcl 1 year ago  |  last reply 1 year ago

### Instructables as an Extracurricular

Really weird question. I didn;t know where else to ask. So I really love tinkering, building things, and making Instructables. I'm applying to college and thought putting it on would be a good idea. However, I really don't know what to 'call' it. if the admissions officers don't know what Instructables is - it looks really weird. Online Tech Blogging would be a wrong way to phrase it. Tinkering is far too general. I'm looking for a short and specific term that includes my love for building/making stuff, and my interest in instructables. Thanks for the help, and I'm sorry if this is the wrong place to ask :(((((

Topic by adithyashok 1 year ago  |  last reply 1 year ago

### Viewing my concept instructables possible?

Hi, Was just wondering; I saved an instructable I was working on without actually publishing it. Somehow I can't seem to find the draft/concept version of the instructable I made. How can I find them / navigate to them on the website? thanks in advance, Joost

Topic by joostvanpoppel 1 year ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### UV filtration in your fish tank or small fish pond

Topic by Downunder35m 1 year ago  |  last reply 1 year ago

### email images not displaying

I'm not getting images in my Instructables newsletter emails. Almost all of them are broken except for the We're Hiring graphic. The links in the image placeholders work. But without the images I'm not inspired, so I don't bother to click and follow the link. I have no problem with any other emails from other websites. I'm using Outlook 2007 on Windows Vista. (Please don't suggest using a different email program.) I've added Instructables to my "Safe Sender" list and "Safe Domain" list. What's going on?

Topic by PaulyG10657. 2 years ago  |  last reply 1 year ago

### Email newsletter not displaying images

The last few email newsletters I received are not showing images. Prior to maybe a month or so ago this was never an issue. I'm on Windows XP service pack 3, using Outlook 2003, my internet browser is Firefox 47.0.1 but the problem is email related. In the latest newsletter, one image actually does display. And 3 link buttons at the bottom displayed - everything else has the dreaded red X instead of the images. Screen captures below.

Topic by DesignCutters. 2 years ago  |  last reply 1 year ago

### Is there a way to measure for methanol in your final product

Is there a way to measure for methanol in your final product?

Topic by Tjmcwi 1 year ago  |  last reply 1 year ago

### Grandma got run over by a reindeer rip offs Put another log on the fire

Hi Everyone, Have you notice this song Grandma got run over by a reindeer https://www.youtube.com/watch?v=MgIwLeASnkw Is a rip off of this song  https://www.ouvirmusica.com.br/willie-nelson/put-another-log-on-the-fire/ I not trying to ruin Christmas just thought its hilarious, when my 8 year old was singing "grandma got run over by a reindeer" , I gave her some lines form "put another log on the fire" Now grandma is having a really bad Christmas!

Topic by liquidhandwash 1 year ago

### Cheap Slot car track

I LOVE using slot cars. I HATE the price of them. Does anyone know where I can get some cheap slot car track. When I say cheap, I mean less than \$60 for a good bit of track. I plan on slowly building up my main straight away(s) to be long so I can test speed. Any site or info would be nice. But' I'm also considering build the track myself. Meaning, I use a router and and a couple pencils and string to build it out of wood. I know it takes time but I'll have 2+ hours a day with nothing to do. Help? Anyone?

Topic by ry25920 11 years ago  |  last reply 1 year ago

### How to Help Out Around Instructables

Topic by ewilhelm 10 years ago  |  last reply 1 year ago

### Getting the Arduino to Convert analog signal from guitar into correct frequency

Hello Everyone, I was wondering if anyone can help me with a simple solution to my problem, I was to be able to get the sounds from my guitar into my ardunio and have the correct frequency be stored. I can get the guitar connected to the arduino and numbers come out of the serial monitor but they don't make sense, i need to have the correct frequency come up for each note i play, I have looked at a few solutions but being a beginner to this some go over my head or they just didn't work. Can anyone help me or point me in the right direction to be able to do this? Thanks  P

Topic by paddykoolster 1 year ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### Arduino Motor Control Shield

Hi! I am having trouble with two motor control shields. 1 - Arduino motor control shiels                                               // Hole-through devices  2 - Adafruit motor control shield V2                                         // SMT devices My problem is the installing the libraries.                                // will not compile,  need an AFM !!! I have done this before, but every now and then I'll get stuck or confused doing it.                    I've read the tutorials and seen the Youtube, what can I say I'm still stuck.                          // simple get hard sometimes I normally build my own circuits and programme them, but lately, I'm buying them already made and most of them need a library. . If anyone can help me I sure would be thankful. Thanks Frank G.

Topic by 56Frank 1 year ago  |  last reply 1 year ago

### Anyone using Tinkercad vs 123D Design? Curious about how and why people use one or the other.

Tinkercad is great for beginners, while 123D is slightly more advanced with features.  Does anyone prefer one over the other for different reasons?

Topic by andrewt 5 years ago  |  last reply 1 year ago

### temperature logging with raspberry pi

New here, and to Pi/Python looking to log data from a few different sensors from Atlas Scientific (RTD & PH).  I've gotten really stuck so fare in getting these going and was wondering if anyone here can help me out.  so far I've used this code:  import smbus import time import datetime #SMBus(0) - Raspberry Pi Model A #SMBus(1) - Raspberry Pi Model B bus = smbus.SMBus(1) #I2C address of sensor address = 0x66 def temperature():     rvalue0 = bus.read_word_data(address,0)     rvalue1 = (rvalue0 & 0xff00) >> 8     rvalue2 = rvalue0 & 0x00ff     rvalue = (((rvalue2 * 256) + rvalue1) >> 4 ) *.0625     #print rvalue1, rvalue2     return rvalue print("Temperature Data Logger\n") while True:         #Open Log File     f=open('tempdata.txt','a')     now = datetime.datetime.now()     timestamp = now.strftime("%Y/%m/%d %H:%M")     outvalue = temperature()     outstring = str(timestamp)+"  "+str(outvalue)+" C "+str(outvalue*1.8+32)+" F"+"\n"     print outstring     f.write(outstring)     f.close()     #log temperature every 10 seconds     time.sleep(10) I've got the two sensor boards connected to the raspberry pi 3 mounted via a Whitebox Tentacle T3.   The boards are in i2c mode and i can see them using sudo i2cdetect -y 1 (they show up address 63 and 66)  but when i run this program above I just get a red error light when it reads the temperature.   The log file reports a measurement of 2C and 35.2F which is not correct but the red light on the board tells me that the Pi is trying to connect with it.   Anyone able to help?

Topic by Chair_t 1 year ago

### coMBINING ARDUINO SKETCHES

Topic by BibekP4 1 year ago  |  last reply 1 year ago

### Bumping old question w. insufficient responses?

I posted a question a year ago and got a few responses, but nobody quite answered in the way that would have been useful.  I did appreciate the replies (and expressed so), but none hit the nail on the head. The thread went dormant, you could say.  Is there a way to bump the thread up in the specific forum?  Thanks.

Topic by Joel_BC 1 year ago  |  last reply 1 year ago

### favorite bands of all time

What is your favorite band? what type of music is it and whats your favorite song of theirs?

Topic by michael J. caboose 10 years ago  |  last reply 1 year ago

### 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 1 year ago  |  last reply 1 year ago

### Tips and Hints

This is my invention for the day.  Use of magnetic tool holders is a very old, but handy way to organize tools.  My contribution to Magnetic Tool Holders is to use small, strong magnets (12 mm diameter) attached to a metal bar or in the photo, to my card table edge.  That in itself is still not very significant. However HOW the tools are hung from the magnets is significant. The problem:  If I put the magnets vertically and hang the tools vertically, the surface area of the magnet is such that often the attraction between the tool and the magnet causes the magnet to stay with the tool instead of with the table.  A magnet sticking to the tool, can be very annoying. The solution:  Placing the magnets horizontally--at the bottom--AND hanging the tools by their tips allows for very easy detachment and attachment.  The magnetic force is strong enough to hold some very heavy tools, like the pliers or long nose pliers without any difficulty.  The tools are easily removed and easily replaced.  This would also apply to any magnetic strip.   The key thought of the day: Hang tools from magnetic tool holders by their tips. Of course, another solution is to glue the magnets to the supporting bar--wood or metal--and clamp the supporting bar to the table.  That works as well, but is more permanent and is a little more work.  Also, if the magnets are allowed to attach by their full surface area to the tools, the tools are hard to remove.

Topic by stannickel 1 year ago  |  last reply 1 year ago

### ICL7107 and LM35 based 7-segment thermometer

I'm trying to create a digital centigrade thermometer based on an ICL7107 3 1/2 digit 7-segment driver/ADC and an LM35 linear centigrade temperature sensor but I'm having a few problems. There doesn't seem to be much online about using the ICL7107 with a LM35 and most of the schematics available are for volt meters, but that's not a massive problem as the LM35 gives 10mV/C linearly. I'm just trying to go based on the few schematics I have found but I'm wondering about the supporting components for the LM35 which seem a little too simple. The first schematic I found was from a Hungarian electronics forum and seems to depict a diode and amplifier being used for the temperature sensing which seems like a bad idea to me. The second seems more like what I'm trying to do. The other few things are the negative voltage source, the first schematic shows an inverter being used as does the datasheet, but the second schematic shows an LMC7660 voltage converter which seems like a better option to me. The second one does also show three diodes in series used to drop the voltage for the LED displays which doesn't seem like the best idea, but I can't think of a better way to do it without attaching resistors to each one as the number of lit segments will be variable. The supporting components for the ICL7107 seem pretty consistent between the two and the schematic so I'm confident those are correct, but I'm looking for some advice on how to connect the LM35 in a way that will give me an accurate readout. Thanks!

Topic by andy70707 5 years ago  |  last reply 1 year ago