Using an Arduino Uno R3 or R4 with a LED, and push button we will make a on and off switch. ... Using an Arduino Uno R3 or R4 with a LED, and push button we will make a on and off switch. Resources.

This circuit is not identical to the final design shown in my schematic but demonstrates the DHT11 functioning, integrated with the arduino, and displaying room temperature on the 16 by 2 LCD display.