Tag Archives: AC load timer


ESP8266 timer switch

Here are the instructions for building an ESP8266 timer switch for controlling an AC load connected to a wall socket. It uses an ESP-01 module which is programmed to act as a digital ON/Off timer and controls an external relay circuit. The relay circuit must be isolated from the ESP-01 module using an opto-coupler circuit to prevent any electromagnetic interference from the relay coil which may cause reseting of the ESP8266 device.

ESP8266 timer switch for controlling AC load

ESP8266 timer switch for controlling AC load