Four-axis 3D printer control board based on STM32F1

This project is a fork upstream project

The main modifications are as follows. At the same time, the wiring has been rearranged and changed to single-sided components.

• Modify single-wire UART mode and incorporate exclusion
• Modify SWD interface
• Fixed USB-D+ pull-up control issue
• Delete the WS2812 light and keep only the interface
• Modify the DCDC part to save BOM costs
• Delete the inverter in the MOS control part
• Modify the interface to Type-C, CC defaults to the source output 5V
• Modify power and heating interfaces
• Modify the limit switch interface to 3pin
• Modify the buzzer interface to disconnect the jumper cap
• Adjust X, E0, display, I2C, PWM and other ios, use the software I2C interface to connect to EEPROM, and FAN0 is multiplexed with BEEPER
• Separate CS from SD and external SPI devices
• RESET adds a pull-up to avoid problems with some domestic compatible films

Test project (tested under klipper):

• 12V and 20V power supply
• Normal homing and printing
• Normal heating and temperature control
• Hardware PWM driven fan
• TMC driver communication (only stepper motor drivers with UART address bit function such as TMC2209/2226 can be used)
• Type-C external power supply and Orange Pie Zero2 one-line communication
• Automatic shutdown module
• Automatic leveling probe
• ADXL345 and SD card

2D rendering photo

Photos of the actual object (space is limited and a bit messy)