• Interaction between pH, EC, and Redox sensors?

    Hello, we have connected a pH, EC, and Redox sensor to our Arduino, however the system shuts down every other day and we need to restart it by unplugging it for a few seconds. We suspect that the sensors (which are constantly submerged in water next…

  • Any interest in collaborating on a REBOOT for the Apple II?

    I am seeking a solution for a single pushbutton reset/reboot for the Apple II. In my volunteer work with young children (8-10 yrs old) using the Apple II they frequently want or need to reset the Apple II (we use both //e and II+). There are several obsticals…

  • Unstable driving voltage for 4 haptic by DRV2605 and mux??

    Hi element 14! I am designing a Device which needs four vibrator to perform some haptic patten! I use four DRV2605 to drive one vibrator, and a multiplexer to control each DRV2605 through I2C! the main MCU I am using is ESP32. Unfortunately, when all…

  • Extra eyes on ESP32 Reflections ThingTwo main board?

    Hi 14-ers, I'm seeking your help to review the third revision to the Reflections open-source hardware main board, codenamed ThingTwo. It's an ESP32-S3 in a 34 mm round double-sided board. This is my first-time to produce a hardware/software project. I…

  • Emulating keypad signals to microcontroller?

    Hey folks, I always learn so much here. I am back with another question: About a year ago in one of my retro computing buying binges, I purchased a Science Fair (Radio Shack) Microcomputer Trainer..these are circa 1985. http://oldcomputermuseum.com/microcomputer_trainer…

  • How control many servos?

    I have an Idea inspired in the kinetic sculptures and the art installation Reflection made by Adam Cigler, Petr Vacek and Prusalab, my idea is like a clock using many hexagonal mirrors where each hexagonal is pull out by a servo so I would like know the…

  • Irrigation system based on RF valves - can it be done?

    Hi all, I'm looking at creating a zoned irrigation system for my garden where RF-valves can be run off a main water feed that runs around the garden. Essentially a main box would send signals to each valve as it is needed to water a flowerbed. Is anyone…

  • my development case 1

    My portable compact development case containing a raspberry pi, Arduino and screen
    • https://youtube.com/watch?v=I8-r1WxuIz8
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  • EEVblog #127 - PCB Design For Manufacture Tutorial - Part 1

    PART 2 is HERE: http://www.youtube.com/watch?v=Uemr8xaxcw0 PART 3 is HERE: http://www.youtube.com/watch?v=2zGisPMNstI A how-to guide to taking your electronics project from prototype through to high volume PCB manufacture. Covers component selecti...
    • https://youtube.com/watch?v=VXE_dh38HjU
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  • My project Development case Idea

    My project Development case idea Due to limited space this case would be quick to set up as a multi functional development flight case The case lid will be holding a 7“ vga lcd display this display works on 12v the case lid will also have access to the…

  • control multiple TLC5940?

    So, my question is how do i control multiple TLC5940 ? I know i can connect them together, http://tlc5940arduino.googlecode.com/svn/wiki/images/breadboard-arduino-tlc5940.png , but i dont know how to "activate" the pins on the second TLC In the code i…

  • X10 Power Line Transceiver

    I am looking for a way to display the status of a driveway gate at the house using the 115V line that power's the gate. The status being opened, closed or in transition. I thought the X10 protocol used for home automation products would be a good method…

  • arduino and LC-305 LOAD CELL

    Hi, i bought the LC-305 button load cell as shown in this website: http://www.farnell.com/datasheets/1824517.pdf however, as the entire set which comes along with the load cell is too expensive, i thus bought the standalone load cell (without other sensors…

  • raspberry pi camera and arduino gsm shield for sending photos to a phone

    hello everyone my name is Nathan Weber and I have a very big question to ask of all you. My question is that I'm getting a arduino uno this holiday with a gsm shield and a sd card to go with it. So what I want to know is that if I were to have a raspberry…

  • Using a 12V lipo to power LED strip and Attiny 85

    Hi, I'm trying to reproduce this tutorial, https://learn.adafruit.com/rgb-led-strips/usage , but power it off an 12V 5Ah battery and use an Attiny 85 instead of an arduino uno. I have it all working, but I'm running the Attiny 85 microcontroller off a…

  • Arduino project

    I am working in a project , the idea is that i want to send voice recorded file from android smartphone to arduino by bluetooth module and when arduino receive this file it display this voice as a text on lcd display, i know there was an app which recognize…

  • arduino wifi shield not found

    hi friends i tried to interface arduino mega 2560 with Cduino Base v2 WIFI Module but it always shows wifi shield not present help me please

  • Looking for a very sensitive flow rate sensor/controller

    Hi there, Brand new user, hopefully a long lasting one. I've signed up today to ask for your help in finding a component. I need something that can control an amount of liquid dispensed that's accurate to 0.1ml. quite a big ask i suppose.. but nevertheless…

  • Maze Solving Robot

    I want to build a line follower maze solving robot which can solve any maze. I don't want to use simple right/left hand rule to solve it, as this method is not efficient to solve loops in the maze.

  • need help finding the right sensor

    I am the one working on the ping pong table and I have come to a halt. jason721 helped me by showing me inductive technology to try I am at a standstill at trying to figure it out. I don't have much money for any kits to learn how to use it and I have…

  • light up ping pong table

    Hi. My friends and I have always loved ping pong and I have though of a way to make it better. I am somewhat new to programming and designing, but I am looking to start off by building a light up ping pong table. the design would feature( or would like…

  • How to get real time video from a camera component taken out of old mobile and connecting it to a small lcd panel

    I am doing a project where a part of it involves 1. Salvaging the camera out of an old mobile phone 2. Connecting the camera component to a bluetooth device to send the data wirelessly 3. Receiving the wireless data using another bluetooth device and…

  • How to use a 7.4v 2S LiPo with integrated charging for my project?

    How would I go about including a 7.4v 2S LiPo battery with integrated charging in my project? The ideal situation for me would be to have the battery and charging in the project so that I could just connect a USB or barrel jack connector for charging…

  • Measuring low resistances with Arduino

    Hi, I want to measure a resistance of about 0.4-1.6 ohms with an Arduino. I'm guessing this can't be done by a simple voltage divider because of the low resistances. How could I achieve this? The measurement doesn't have to be very accurate. The question…

  • Arduino  - function to get reply after each AT command send to phone

    Hello, I'm connecting a Sony Ericsson k700i phone to Arduino Uno. I'm able to send AT commands but cannot get all the bytes when requesting a SMS read. I wrote a small function to execute AT commands and get reply but it does not show the reply from phone…