Algorithm 1 The Pseudo-Code of Air Conditioner Energy Control Based on IoT

1: Capture the image by the camera

2: Resize the image

3: Input the image data to the YOLOv3 model

4: Do the recognition process by the YOLOv3

5: Publish the number of detected persons by MQTT protocol

6: Do data analysis by Contact elements for IoT

7:  if the number of persons ≥ 1

8:   Send signal “1” by MQTT protocol to the air conditioner microcontroller

9:   Connect the power of the air conditioner

10:   Present the number of persons on the IoT dashboard

11:   Record event of air-conditioned “on”

12:  else

13:   Send signal “0” by MQTT protocol to the air conditioner microcontroller

14:   Disconnect the power of the air conditioner

15:   Present the number of persons on the IoT dashboard

16:   Record event of the turn off the air conditioner

17:  end if

18: Record all events and data on the system database for any further analysis