A quick and compact Arduino Nano setup with four DIP switches to allow for mode selection. Power is provided by CR2032 battery package.

Probably the most useful Arduino project I've ever made! A automatic tester for a product I sell.

A bit more accurate than __TIME__.

Use the IO Expander and Relay Expander with the Arduino to control up to 65,280 relays!

Goodbye calibration! Digitization of pH test paper! This is a pH meter that reads the color of the pH test paper.

An Arduino Nano used as an IO expander on I2C for ESP8266. For example, add 8 digitals IO and 6 analog inputs.

In this tutorial, I am going to talk about the PCF8574 8-bit GPIO port extender.

Inexpensive to build but a very useful tool for every electronics laboratory.

Make a cheap variable power supply using the buck converter.

Your personal universal electronics kit. More I/O pins. More devices. More distances. Remote wireless control. No bunch wires.

Did your somewhat expensive ($50) soldering iron just die? Well then fix it with another one!

Make a Linux distribution that is focused on the development of Arduino and IoT. It's a Distro for Arduino.

A study for a linear measuring device with Arduino and photoelectric rotary encoder.

In this project, I am going to make a LAN cable tester with just a few basic electronics components. It cost me just a bit over $3.

This circuit allows for one thermistor input and will output up to four similar values using digital pots.

Control your Commodore C-64, reset C64, select Kernal, BASIC and Charset ROM, SD2IEC device#, info display.

Track display for a Commodore 1541 floppy drive (retro hardware).

I wanted to make an electronics learning kit suitable for ages 12 and above. Nothing fancy like Elenco's kits but It can be done at home.

A simple yet effective demonstrator of a gear pump endorsed with Arduino Nano + MPU6050 accelerometer to measure vibrations.

Need fast cheap laser rangefinder for your Arduino project? You can use a laser tape measure for this!

It's an elevator with automatic doors. The code has two FSM, one for the motor that makes it go up and down and one for the automatic door.

This is my 4th tutorial on how to drive a RELAY (not a relay module) with an Arduino.

Incubator that can be fabricated in a typical makerspace at a low cost while achieving the same performance as commercial units.

In this project, you can measure typically up to 48V. It is recommended to use Arduino digital voltmeter as “0-48V DVM”.