IR sensor. LED. Jumper Wires. Working Principle: IR Sensor Operation: The IR sensor emits infrared light from an LED and detects the reflected light with a photodiode. When an object comes within the ...

Build a Battery Tester. An Arduino can be used to test the life of any battery with less than 5 volts, Boxall says. So, for a quick way to see how much juice your AAA, AA, C, or D batteries have ...

Arduino’s $87 Plug and Make Kit comes with all the parts needed to build seven different IoT devices, including a weather indicator and a game controller. Electronics 101. Skip to main content ...

Arduino’s Plug and Make Kit lets your hacking imagination ... and a built-in 12×8 LED matrix ... eight LEDs, a proximity sensor, a motion sensor, a simple buzzer/speaker, a temperature ...