If you want use two Arduino, you can use a simple I/O port to communicate. The point of question is the Ground.
by Giovanni Gentile
Ease of Python programming on the powerful Arduino Due.
Project in progress by AdiK
Training kit for Arduino teachers.
Project showcase by ArdLab_Gent
This is used as a clock accuracy check by triggering the minute or hour hands.
Project showcase by Team Bobby
This example demonstrates how to store data in a
table in MySQL from 4 button connected to pins 2, 3, 4, 5 direct
Project tutorial by amirso
Sonar + radar = Sodar. It eliminates camera at private places without compromising surveillance.
Project in progress by Team Tiny Ants
Clock LCD display adjustable.
Project tutorial by Tittiamo
Self-replicating, rapid prototyping open source 3D printer using an Arduino Mega 2560 that can be controlled via Internet.
Project showcase by Team Tiny Ants
Project tutorial by Salman Faris
Learn the basics of code and electronics using Circuito.io and make a simple Arduino project in 3 minutes.
Project tutorial by circuito.io team
Build a treasure chest or use an existing storage box, attach a push-button quadrature rotary encoder (endless spinning dial) and lets go!
A homemade semi-automatic antenna tuner for HF controlled by an Arduino Nano.
Project showcase by ok1fig
An Arduino interface to communicate with devices using the LANC (Control-L) protocol such as many Sony and Canon cameras/camcorders.
Project showcase by L-Rosen
Simple instruction to let you know how to control an AC voltage device using an IR remote control and the Arduino.
by Mohannad Rawashdeh
Did you ever wonder what happens between the time you click on "Upload" and your sketch starts running? Here's how you can find out...
Learn how to use the Arduino Desktop IDE at its best and install it on your PC!
Demo of I2C serial coms between the PSoC Analog Coprocessor Pioneer Kit as master and an Arduino UNO as slave.
by Steven Bell
A RFID module connected to two LEDs.
Project tutorial by Tudose Matei
This tutorial explains how to upgrade the libraries and the Arduino 101 Firmware.
by Gustavo Reynaga
A useful and easy way to control AC Lamp using a motion sensor and Arduino board.
Based on Blockly and BlocklyDuino, here's a multilingual enhanced version with supervision, upload, multi-level blocks, etc.
Project in progress by Team LibrEduc
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