🌲 Indoor Infrared receiver and transmitter with temperature sensor 🎐

power AA
wireless Infrared
mcu SAMD21G18
bom items 49
bom cost USD $9.71
vendors 2
completed September 2020



  • Record and store the ON and OFF aircon commands with IR receiver
  • Turn on or off the aircon with the IR emitter
  • Measure temperature of another part of the room
  • Go into sleep mode after turning on or off the aircon

Getting Started

Step 1

Battery holder

The PCB has 2 battery holder connector holes that can be used to attach the battery holder.

PCB battery connector holes


Put in 3 AA batteries and turn on the switch. The power LED should turn on.

PCB with battery holder

Step 2

Upload the firmware

Flash the firmware onto the Arduino Zero compatible board with a micro-USB cable.

Web USB setup page

Serial monitor

Connect to the serial monitor to see the debug messages.

Serial console

Step 3

Notice that the aircon should turn ON and OFF every 5 seconds as a test.