A laser diode can be interfaced with Arduino Uno using photoresistors, photodiodes, phototransistors or similar sensors and detectors. Fig. 1: A laser pointer. Laser diodes and modules are available ...

The author’s prototype is shown in Fig. 1 and circuit diagram of a rectifier using Arduino Uno is shown in Fig. 2. This circuit is built around Arduino Uno, centre-tap transformer X1, two diodes, a ...