This project utilizes the 4N35 optocoupler to control a LED. The 7th digitial pin of the Arduino sends signals to the optocoupler in order to determine whether or not the LED turns off or on. A 4N35 ...

Optical smoke detector is a project implemented on the Arduino board and works on the phenomenon of light scatter principle. An Optical Smoke Detector is a device that senses smoke, typically as an ...