I would like to introduce you to one of my interesting projects. It is a wireless thermometer that measures the indoor and outdoor temperature. The device consists of two parts. One is a transmitter that contains one digital temperature sensor and a transmitter module. A second receiver consisting of an LCD screen, the digital sensor and receiving module.
1. Two arduinos any version
2. Two DS18B20 digital temperature sensor
4. LCD 16x2
5: RF 433MHz or 315 MHz module