Pulse/Heartbeat Sensor Featured Products also makes an awesome close

also makes an awesome close range (0-8") infrared proximity detector

the Modern Device Current Sensor is a safe and easy way to sense current with an Arduino or other microcontroller with no fuss

You may need to visit Device Manager to confirm or reinstall

Windows: Follow prompts after "Found New Hardware" appears

The sensor only has three connections 3

Pulse/Heartbeat Sensor Featured Products also makes an awesome closeThis is a heartbeat pulse PSO2 sensor based on a Silicon Labs Si1143 chip. The chip wasn't exactly designed for a pulse sensor but since we developed this sensor Silicon Labs has gone on to market the chip for that application, and it is used in several commercial applications. These include variable LED control for three LEDs and two photodiode detectors. The chip has a boatload of controls for controlling the LED pulsewidth, the LED current and