sensorsLaundromat Automation

KC868-A8 Relay Control

Control KC868-A8 relay module via MQTT for coin switch simulation

Offline

settingsGlobal Settings

Pulse Duration(ms)

Insert Interval(ms)

Number of Controls

tuneRelay Control 1

Channel 1

Primary relay

Channel 2

Secondary relay

Gap(ms)

Delay between CH1 and CH2

Number of Coins

Start Delay(min)

infoHow It Works

1Frontend sends command to Node.js backend via HTTP
2Backend publishes MQTT message to "relay/cmd" topic
3ESP32 (KC868-A8) receives command via MQTT subscription
4ESP32 controls relay via PCF8574 I2C expander

KC868-A8 ESP32 Relay Module - MQTT Control Interface