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Pinout

Note
  • This page lists the pinout of the SB2040-PRO toolboard after flashing the Klipper firmware. Pin numbers are based on the product schematic.
  • UART/CS is the driver communication pin: it functions as UART when using TMC2209 and as chip select CS when using SPI drivers. The same pin is shared for both functions.
  • EN is the enable pin. In Klipper configurations, it is typically active low (the enable_pin is prefixed with !).
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Driver Pins​

DriverSTEPDIRENUART/CSEndstop
DRIVER0gpio9gpio10gpio7gpio11-

Heating​

FunctionPin
Hotend heatergpio6

Temperature Sensors​

FunctionPin
Hotend thermistorgpio27
Enclosure thermistorgpio26
Supported Thermistor Types

The thermistor port supports NTC thermistors (100K) by default. It is recommended to configure the sensor_type as Generic 3950.

List of built-in sensor_type options directly supported by Klipper and their applicable scenarios: Thermistor Configuration Guide

K-type thermocouples and PT100 require additional signal conversion chips and cannot be connected directly to the thermistor port.

Fans​

FunctionPin
Part cooling fangpio13
Heatbreak cooling fangpio14

Probe and Endstops​

FunctionPin
HV-IN / General inputgpio28
X endstopgpio29
Probe / General inputgpio25

RGB​

FunctionPin
RGB / Neopixelgpio12

Accelerometer (SPI)​

The accelerometer uses software SPI and requires three separate signal pins to be specified:

SignalPin
CSgpio1
MOSIgpio3
MISOgpio2
SCLKgpio0

PWM​

PWM FunctionPin
RGB / Neopixelgpio12
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