Arduino Brew Timer and Temperature Display for LaMarzocco Linea Mini espresso machine

Board

• STM32 BluePill (generic STM32F103C8) with Arduino Framework

Extension modules and peripherials used:

• SSD1306 OLED display, I2C - optional, please see source code for feature switch (SSD1306_ENABLED)
• ILI9340 TFT display, SPI and 8 bit data - optional, please see source code for feature switch (ILI9340_ENABLED)
• reed switch, sensing magnet valve sc
• INA219 voltage and current sensor, I2C

Libraries used:

• SSD1306Ascii by Bill Greiman - Copyright (c) 2019, Bill Greiman
• Adafruit INA219 by Adafruit - Copyright (c) 2012, Adafruit Industries
• MCUFRIEND_kbv - Copyright (c) 2020, David Prentice

BluePill pinout connections

Wiring of reed switch:

• PB3
• GND

Wiring of I2C devices (INA219, SSD1306):

• SDA - PB11 (I2C2 used due to pins required for ILI9340 TFT)
• SCL - PB10 (I2C2 used due to pins required for ILI9340 TFT)

Wiring of ILI9340:

• LCD pins==>|D7 |D6 |D5 |D4 |D3 |D2 |D1 |D0 | |RD |WR |RS |CS |RST| Not in use: |SD_SS|SD_DI|SD_DO|SD_SCK|
• STM32 pins>|PA7|PA6|PA5|PA4|PA3|PA2|PA1|PA0| |PB0|PB6|PB7|PB8|PB9| Not in use: |PA15 |PB5 |PB4 |PB3 | (ALT-SPI1)

Toolchain

• VSCode
• Platform.IO
• STM32duino (Arduino firmware for STM32)

Copyright (c) 2021, Robert Klajko

BSD license, all text here must be included in any redistribution.