PID controller being used on a pre-2015 Gaggia Classic boiler

The slow responding and somewhat innacturate bimetal coffee thermostat is replaced with a K type thermocouple connected to an Arduino controller that controls a Solid State Relay (SSR) to control power to the small boiler inside the espresso machine.

• Fix: MQTT reconnect changed from 2 to 15 to stop reconnect from blocking the rest of the loop

• AP password = espresso

MQTT stat topic = espresso/<thingName>/stat

Example stat payload {"Name":"thingName","Uptime":60,"Runtime":60,"Setpoint":105,"Input":105.0,"Output":5.08,"ADC":28457,"Vout":1.78,"operMode":true,"Loops":27734,"steamMode":false}

MQTT command topic = espresso/<thingName>/cmnd

• {"operMode":true|false}
• {"steamMode":true|false}
• {"Setpoint":<number between 1 and 110>}