In essence, you connect a common 433 MHz receiver module to an ESP32 or ESP8266 ... these type of sensors, as well as projects that pulled them all together into a complete home automation system ...

It’s based on a SparkFun ESP32 Thing, a very compact way to add ... an APDS-9930 proximity sensor, as well as four CNY70 IR proximity sensors on the bottom, used for line-following.