W1209 Digital Temperature Control Switch is a programmable themrostat. The same module can be used in both controlling / maintaining Cold and Hot temperatures. Parameter 0 can be set to either Hot or Cold Control setting. The relay module is based on a microcontroller (MCU) and has 7 user configurable parameters accessible using 3 push button
The basic concept of IR(infrared) obstacle detection is to transmit the IR signal(radiation) in a direction and a signal is received at the IR receiver when the IR radiation bounces back from a surface of the object.