Temperature control air conditioning

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To control air conditioner by detecting environment temperature. When temperature increases to a certain value, the air conditioner will start. On the contrary, the air conditioner will close when the outside temperature decreases to a certain value.


Use temperature and humidity sensor AM2321 to detect indoor temperature and then control the air conditioner by matching codes with infrared transmission sensor.


Module Number Function
Microduino-CoreUSB 1 Core board
Microduino-Sensorhub 1 Sensor pin board
Microduino-Temp&Hum 1 Temperature and humidity sensor
Microduino-IR transmitter 1 Infrared transmission sensor
Microduino-Converter 1 Pin board

Hardware Buildup

  • Setup 1: Stack CoreUSB and Sensorhub.
  • Setup 2:Connect Microduino-IR transmitter via pin board to D3 pin of Sensorhub and Microduino-Temp&Hum to IIC pin of Sensorhub.
Microduino-sensorhub rule.JPG

Software Debugging

  • Air conditioner infrared remote control encoding definition. Here the conditioner adopts NEC encoding format.
IRsend irsend;       //Infrared transmission 
AM2321 am2321;       //Temperature and humidity sensor AM2321 

#define POWER_ON 0xC1602680    //Air conditioner power on/off encoding 
float temp = 0;        //Temperature value 
unsigned long runTime = 0;   //Air conditioner power on/off time
  • Detect the current temperature value every second. When the temperature is above 30℃, the air conditioner opens and when it is below 25℃, the air conditioner closes. The time interval between opening and closing is 180s for fear of frequent operation.
am2321.read();           //Acquire the current temperature value 
temp = am2321.temperature/10.0;
if(millis()>runTime+180000)    //Above 180s time interval
  if(temp > 30)         //Higher than 30℃ and the air conditioner opens. 

    runTime = millis();
  else if(temp <25)     //Lower than 30℃ and the air conditioner closes.
    runTime = millis();    




When the temperature is above 30℃, the air conditioner opens and when it is below 25℃, the air conditioner closes. By detecting temperature value to control other functions of the air conditioner.