Implementation of air conditioning control system using REST protocol based on NodeMCU ESP8266

The existing conventional AC Split device don't have a network connection. The user can't control the AC Split device via network. This paper explains a NodeMCU is used to control a conventional AC Split device through the network using Wi-Fi connection. In this research, the system is designed to upgrading the conventional AC Split device without modification the AC Split device. NodeMCU is connected to IR LED to transmit the IR command and LDR to know the AC power condition status. All component is built-in to the module that calls Wi-Fi IR module. This module just plugs on the AC Split device and then the AC can control via Wi-Fi network. REST protocol communication is used to control the module using specific URL that sends using the browser or REST client application. In testing step, the module is attached on the AC split and successful control the AC to turn off and set the temperature. The processing time over the network between transmit and received the response from IR module is around 527.85 ms. The connection and receiving time are depending on the quality of the network.