MaraX Monitior - Visualisation for the Lelit Mara X (V2) with an automatic Shot-Timer

Here is my attempt for a Mara X v2 Shot Timer. It uses the Serial interface from the Mara X to visualize the Stats on a 1.3" Display.

Parts

• WEMOS D1 mini (You can use any other equivalent board)
• 1,3" SSH1106 OLED Display

The Interface

The MaraX has a 6-PIN Connector for the serial interface on the bottom. We only use PIN-3 (Mara RX - Black Wire - Green Rectangle) and PIN-4 (Mara TX - Orange Wire - White Rectangle). For testing you can use the jumper-wires later you should replace them with temperature protected cables.

• PIN3 Mara to D6
• PIN4 Mara to D5

RX Mara to TX Arudino TX Mara to RX Arduino

The Data

Example Data: C1.06,116,124,093,0840,1,0\n

• The delimitter is: ,
• The end of data is: \n
• Length: 26

Data	Description
C	Machine-Mode: C = CoffeeMode; V = Vapour/SteamMode
1.06	Firmware
116	Current Steam Temperature in Celsius
124	Target Steam Temperature in Celsius
093	Curent Hx Temperature in Celsius
0840	Countdown Boost-Mode
1	Heat state (0 = off; 1= on)
0	Pump state (0 = off; 1= on)

Display Wiring

Pin Display	Pin Arduino Nano
VIN	3,3V
GND	GND
SCL	D1
SDA	D2

Libaries

• Wire.h
• Adafruit_GFX.h
• Adafruit_SH110X.h
• SoftwareSerial.h

Fonts used

• GothicA1_Light6pt7b
• GothicA1_Light9pt7b
• Org_01

Bootup Logo

• Create your Logo with the dimensions: 128x64px
• Convert your image to a binary file for example with this Tool https://javl.github.io/image2cpp/
• Replace the data for logo_bmp in images.h

Special Thanks goes to:

• SaibotFlow: https://github.com/SaibotFlow/marax-monitor
• RedNomis: https://github.com/RedNomis/MaraXObserver