ESP 01 Relay MQTT

ESP 01 with relay control via MQTT (electric locks, car heating), design in Arduino.

1 – Smartphone /tablet with MQTT-client and/or browser
2 – MQTT-broker, optional Node-Red
3 – ESP01 with relay

The relays turns on and off via MQTT.
Configuration (duration of activation, activation command, MQTT-broker, etc.) via the browser.
The example is very simple, as an independent application it can be used, for example, to remotely turn on the car heating in winter.
It can also be used in conjunction with the Raspberry PI doorbell in conjunction with Node-Red -> HTTP or Node-Red -> MQTT to open the electric lock.