This article describes connectors on the Original Prusa MK4, which can be used to connect your own or any 3rd party accessory.
Warning: Keep in mind the maximum allowable electric current (I) and voltage (V) limits. Failure to do so may result in permanent damage to the board. This article is intended for experienced users only!
xBuddy
| Connector | Pin | Type | Function | GPIO | Limitations |
|---|---|---|---|---|---|
| J29 (ACCELEROMETER) |
1 | open drain output | SPI2 CS | PA10 | max 3.3V/5mA |
| J29 (ACCELEROMETER) | 2 | input/output | SPI2 SCL | PB10 | max 5V/5mA |
| J29 (ACCELEROMETER) | 3 | input/output | SPI2 SDI | PC3 | max 5V/5mA |
| J29 (ACCELEROMETER) | 4 | input/output | SPI2 SDO | PC2 | max 5V/5mA |
| J29 (ACCELEROMETER) | 5 | 3V3 | POWER | X | max 50mA |
| J29 (ACCELEROMETER) | 6 | GND | POWER | X | - |
| J23 (I2C) | 1 | input/output | I2C2 SCL | PF1 | max 5V/5mA |
| J23 (I2C) | 2 | input/output | I2C2 SDA | PF0 | max 5V/5mA |
| J23 (I2C) | 3 | 3V3 | POWER | X | max 50mA |
| J23 (I2C) | 4 | GND | POWER | X | - |
| J15(A_TEMP) | 1 | analog input | THERM 3 | PF5 | max 3.3V |
| J15(A_TEMP) | 2 | GND | POWER | X | - |
| J6 (MMU) | 1 | input/output | USART6 TX | PC6 | max 5V/5mA |
| J6 (MMU) | 2 | RS485- | USART6 | X | max 3.3V/250mA |
| J6 (MMU) | 3 | input/output | USART6 RX | PC7 | max 5V/5mA |
| J6 (MMU) | 4 | RS485+ | USART6 | X | max 3.3V/250mA |
| J6 (MMU) | 5 | MMU 5V (switchable) | POWER | PG2 | max 5V/0.5A |
| J6 (MMU) | 6 | open drain output | MMU RESET | PG8 | max 5V/5mA |
| J6 (MMU) | 7 | GND | POWER | X | - |
| J6 (MMU) | 8 | output | nAC FAULT | X | max 3.3V/5mA |
| J6 (MMU) | 9 | GND | POWER | X | - |
| J6 (MMU) | 10 | MMU 24V (switchable) | POWER | PG2 | max 24V/3.6A |
| J6 (MMU) | 11 | GND | POWER | X | - |
| J6 (MMU) | 12 | MMU 24V (switchable) | POWER | PG2 | max 24V/3.6A |
xLCD
| Connector | Pin | Type | Function | GPIO | Limitations |
|---|---|---|---|---|---|
| P11 | 1 | 3.3V | POWER | - | max 3.3V/50mA |
| P11 | 2 | open drain output | LCD 1wire | PD11 | max 5V/18.5mA |
| P11 | 3 | input/output | I2C3 SCL | PA8 | max 3.3V/5mA |
| P11 | 4 | input/output | I2C3 SDA | PC9 | max 3.3V/5mA |
| P11 | 5 | GND | POWER | X | - |
| P11 | 6 | 5V | POWER | X | max 5V/100mA |
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