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Mainboard

Metric Value
CPU AllWinner R528-S3
Memory 128 MB Onboard
Storage 8gb eMMC
Stepper drivers tmc2209
Front Back
Mainboard image Mainboard back image
Credit to the Elegoo discord. Credit to thijskunst on the OpenCentauri Discord.

Mainboard Pins

Z-Axis Optical Sensor (titled EXT on board)

pin voltage
+ 24v
- GND
s 3.3v when bed is zeroed, 0v when not

Filament Runout Sensor

pin voltage
+ 5v
- GND
s 3v3 when filament is inserted, 0v when not

Light

pin Voltage
+ 24v when Light is enabled, 0v when not*
- GND

* Matches the state of the light on the camera module.

Camera

The camera uses an USB 2.0 connection with a JST connector.

Bed Heating

pin Voltage
+ 24v when bed is heating, 0 when not
- GND

Hotend

Serial-Over-USB connection but the USB's VBus is connected to the PSU's 24v line.