If we are looking at the 4-pin sensor the extra pin is a NC pin, and it has no functions. The pin diagram of both the module and the sensor is shown below. DHT22 Module Pinout The diagram below shows ...

Arduino Uno or similar microcontroller board Two DC motors Motor driver (L298N or similar) Light sensors (LDRs - Light Dependent Resistors) Chassis for the robot Wheels Battery pack Jumper wires ...

Simple arduino device used to montior temperature and light levels in a room, recording readings to an automatically created spreadsheet on Google Sheets, as well as emailing results periodically. A ...