This design, based on a Maxim MAX220 RS-232 driver/receiver IC, allows you to increase the number of USARTs (universal synchronous, asynchronous receiver/transmitters) available on a microcontroller.

Here are the 2 simple circuits named clap switch circuits which are based on clapping. These circuits are useful in switch ON/OFF any devices by just clapping without any movement from your place.

Switching components usually consist of three pins: Voltage or current in one pin lets the current flow between the other two pins. To switch the device on or off, there is a short but not immediate ...