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.

Improved version of the soldering iron controller for Hakko 907 iron. To simplify building the controller, LCD screen is implemented.

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

The soldering iron controller based on arduino that implements PID method to keep the temperature of the iron.

The software library to calculate moon age, sunrise and sunset time.

Step by step approach is followed so that any hobbyist or design engineer can have a better understanding of the basic concepts.

FreeRTOS, simple, easy, robust, and optimised for Arduino IDE. Using FreeRTOS Semaphores to share and protect physical resources.

The Companion IC is a very cool looking Clock + Ohmmeter + Capacitance Meter + Diode Tester!

Tutorial of Shift Register 74HC595, drivers like ULN2803, UDN2981, transistor BC327, making your designs more robust and reliable!

On this simple tutorial, we will explore how to discover colors using an Arduino and the TCS 3200 sensor, displaying it on an LCD.

A programmable, portable, rechargeable power supply based on Arduino featuring an OLED display for viewing V.I.P. of projects/prototypes.

Measure rotation speed (RPM) with Optocoupler and Encoder disk and Arduino - Quick and Easy!

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

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

Build a treasure chest or use an existing storage box, attach a push-button quadrature rotary encoder (endless spinning dial) and lets go!

Connect Matrix Keyboard using only 2 Arduino pins by using PCF8574/PCF8574A I2C GPIO - Quick and Easy!

A homemade semi-automatic antenna tuner for HF controlled by an Arduino Nano.

This project is all about making a power inverter using arduino. The Inverter produces 220VAC from 12V battery.

Get accurate readings for voltage using arduino.

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

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

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.