Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Hello
I wanted to measure DC voltage in the range of 0 to 24 V using an Arduino and I was looking at sensors as well as things I will have to be careful about. I am ofcourse looking to measure the voltage as accurately as I can. I couldn't find a digital voltage sensor but found some analog...
Hello
Currently the Grape-Express Mini development board is on Kickstarter. It's a microcontroller board like the Arduino Mega2560 R3, but this board includes a lot more than just Bluetooth, Wifi, and self-sufficiency. If there is interest, then look on the web page. The goal is not set high but...
Hello, looking to connect a rotary encoder (TTL output) directly to arduino, monitoring one channel.
As motor turns 360 degrees, the state changes for one channel will be 1-0-0, or essentially 1 state change per turn.
How can i record how many state changes have been completed? Does anyone...
Hello, I would like to build a battery powered arduino gps speedometer.
In this arduino based project I would like to include a few features.
-I would like it to turn on some lights when It detects that the speed is going down (if the speedometer is going at 10km per hour and slowing down I...
I'm new to Arduino but have been coding for decades. My major shortcoming is knowing near nothing about electronics and circuitry. I'm really enjoying the learning process but, at present, my aspirations seem to outpace my ability. **broken link removed**
I'm prototyping a system that will...
Hello,
I am having a problem using an MCP45HVX1 digital pot and a common SH1106 OLED display together on the same bus.
Using an Arduino; If I talk to the display, sometimes the POT will glitch, and if I talk to the POT, the screen gets messed up.
Below is a simple sketch which should slowly...
hello everyone...
I've just bought one 'Arduino - uno' kit for myself .... I am a beginner in this field...
I've not even opened the seal of that kit..
I have two questions:
1. do i need a separate power supply for this board (kit) ... or the data cable (with usb) is enough to power this.!
2...
Hello everyone, I am currently working on making a device that I can use with amazon alexa to control the curtains in my room. I have successfully built and programmed it, but I can not figure out how to properly power it. It uses an node MCU ESP-8266, Ln298N motor driver, a NEMA 17 stepper...
Hi,
So basically what i want is a system where i simply use a gsm module like sim800l module and whenever there is a trigger i want the module to send an email to a particular person now there are 2 ways in which this can be done :
- First is that i use the inbuilt functionality of the gsm...
Hi, I need a GSM + MCU combo board for making one POC. Arduino based preferred. Kindly anyone helps me out or suggest some solution for it so looks smaller in size also
Hello.
I am looking for a way to measure AC voltage with frequency from 100 to about 25.000 Hz which is in the range from about 10 mV to about 80 mV which comes from a small coil.
Any suggestion will be appreciated.
Hi, I am making a module for a DIY modular synthesizer. The module applies an ADSR-envelope to an audio signal using a 10K MPC41010 digital potentiometer.
I suspect, I made an error in the circuit, since I now have 2 Nano's which will not power on from USB (pwr led flashes a few times and then...
Hi!
I would like some opinions please if you dont mind. I have one of those new, small analog synthesizers (Behringer Model D). It has a bunch of potentiometers, and switches, etc. to control the sound manually with hands/fingers. In my dream, I want to be able to control the sound...
Hi all.
So firstly I'm a complete noob when it comes to electronics so please excuse my shortcomings here.
My challenge. I have a dry contact connection that is outputting 12v. Ibwant to use this to power an ESP module (WemosD1). The challenge I have I assume is the current. When I connect...
I need help designing a circuit to control a servo motor, the model i have is an SG 90 (9g) It needs to be controlled by a sensor that receives and input from a moving object, (the object moves down), and the sensor reads the signal 1 -> 2 the servo moves up 120deg, (the object moves up) and...
Expanding on Simple Weight Scale
Following up on the article about Sparkfun’s OpenScale project, this article updates the initial project to check calibration at power-up and skip the calibration sequence if a valid calibration already exists. This uses the original article and builds on it...
Hi All
Can I please ask for help with the following.
I have a Tacho sketch working but I want to add an output for an led to be ON between 0 and 200 rpm, and to go off at a above 200 rpm.
I have tried the following but it only works once then I have to reset power.
if(RPM>0 && RPM<200)...
I actually passed this. I can upload and download files. But here is the problem. When I am using my Android without internet and only with hotspot the page index.htm is not working. But while I am on a GPRS I can see that page. How to solve this problem? Using the example from Arduino examples.
Hello,
I need to come up with a solution to a problem. I'm trying to do a project for fun where it's needed to surround a 12 meters perimeter with 3 cameras.
Basically I want to build a security system that records everything in this perimeter. The cameras will have motion sensors attached...
Hello everyone .
I am working on a project, and I stuck in one part, concerning, how to distinguish between plastic and glass, and papers if possible.
what kind of sensors can I use in this case.
thank you in advance
Is it possible to make an oscillator for AM radio with Arduino UNO R3?
What should be the code?
How am I supposed to make a full wave square wave oscillator with Arduino?
How do I interface an Arduino MEGA to this 16x1 LCD (datasheet: **broken link removed** Available from FocusLCDS.com
I'd like to use I2C, if possible?
What other ICs do I need to make it work?
Thanks!
Hello everyone,
First I am saying sorry for this post because I think it is not a pure electrical thing. I was looking for someone who can give me an exact source file or teach me about how to integrate bluetooth in android app to control a bot. I am just looking for a very easy code either...
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