Ports

Board 2

Connect GGM IDS

Default pin mapping for the induction cooker:

Type	Cable color	Connection
Interrupt	blue/green	- (optional)
Command	yellow	D6
Relay	white	D7
Supply +	red	5V / Vcc
Supply -	black	GND

On the wiring diagram, these five connections are marked as GGM. On original cables from the control panel, the interrupt wire is usually blue. On replacement cables it is often green.

Interrupt is optional for normal brewing and mainly used for diagnostics.

Brautomat (including display) can be powered directly from GGM IDS via red/black wires. If you do that, do not connect an additional external supply to ESP32.

Alternatively, use an external 5V DC supply. In that case, do not connect the red GGM wire.

Connect DS18B20 temperature sensors

Brautomat supports up to three DS18B20 sensors. Board labels: DS18B20-1 to DS18B20-3.

Typical cable colors (cheap probes may vary): black/red/yellow.

Type	Cable color	Connection
Supply +	green or red	Vcc
Data	white or yellow	Data
Supply -	brown or black	GND

The three DS18B20 ports are equivalent; sensor order is assigned in software.

Connect PT100x via MAX31865

Type	Connection
SPI clock in	SCLK D9
SDO (MISO)	MISO D10
SDI (MOSI)	MOSI D11
Chip select pin 0	CS0 D13
Chip select pin 1	CS1 D16
Chip select pin 2	CS2 D17
Vin	3V3
GND	GND

For PT100x setups, keep CS assignment order (CS0 to CS2).

Connect display

Cable	Nextion display	Connection
red	Power +	Vcc
black	Power -	GND
blue	TX	D1
yellow	RX	D2