Mainboard
| Metric | Value |
|---|---|
| SoC | AllWinner R528-S3 |
| Memory | 128 MB in-chip |
| Storage | 8gb eMMC |
| Stepper drivers | tmc2209 |
| Front | Back |
|---|---|
 |
 |
| Credit to the Elegoo discord. | Credit to thijskunst on the OpenCentauri Discord. |
Mainboard Pins
24V input
Type: 2-Pin Barrier terminal with 9.6mm pin pitch
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | - | GND | Closest to the stepper connectors |
| 1 | + | +24V | Do not overtighten as it is very flimsy |
Steppers X,Y and Z
Type: JST-XHB-4P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | 2B | 2B | |
| 2 | 1A | 1A | |
| 3 | 2A | 2A | |
| 4 | 1B | 1B |
Filament sensor
Type: JST-XHB-3P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | S | Signal | 3.3v when filament is detected |
| 2 | - | GND | |
| 3 | + | +5V |
Chamber temp sensor (marked "BOX-T" on the board)
Type: JST-XHB-2P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | none | Sig | standard NTC100k B3950 |
| 2 | none | GND |
Light
Type: JST-XHB-2P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | + | +24V | Max 1A |
| 2 | - | GND_PWM |
Side fan (Marked "FAN-1" on the board)
Type: JST-XHB-2P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | + | +24V | MAX 1A |
| 2 | - | GND_PWM |
Rear exhaust Fan (marked "BOX-F" on the board)
Type: JST-XHB-2P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | + | +24V | MAX 1A |
| 2 | - | GND_PWM |
Camera
Type: JST-XHB-4P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | GND | GND | regular usb port but with a JST connector |
| 2 | DP | USB-DP | |
| 3 | DM | USB-DM | |
| 4 | 5v | +5V |
UART0
Type: JST-XHB-2P + 4-Pin 2.54mm pin header
| pin nr | marking | Function | remarks |
|---|---|---|---|
| JST: | |||
| 1 | TX | RS232-TX | connected to 4-pin header |
| 2 | RX | RS232-RX |
4-Pin Header:
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | GND | GND | square pad |
| 2 | TX | RS232-TX | |
| 3 | RX | RS232-RX | |
| 4 | 5v | +5V | J4 marking |
Multicolor
Type: JST-XHB-5P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | 24V | +24V | 24v for motors inside the MMU |
| 2 | GND | GND | |
| 3 | 5V | +5V | 5v can be turned off to reset MCU in the MMU |
| 4 | DM | USB-DM | standard usb 2.0 |
| 5 | DP | USB-DP |
USB-C --> Extruder Board
Type: USB-C (USB 2.0 only)
Warning
Do not plug in anything other than the extruder board. this type-C connector has 24v vcc instead of 5v. Anything you plug in WILL GET FRIED!!
| pin nr | marking | Function | remarks |
|---|---|---|---|
| A1/12 | none | GND | |
| A2/B11 | NC | ||
| A3/B10 | NC | ||
| A4/B9 | 24V! Vbus | Switched 24V | |
| A5/B8 | A5=CC1 B8=SBU2 | not used | |
| A6/B7 | USB 2.0 DP | ||
| A7/B6 | USB 2.0 DM | ||
| A8/B5 | A8=SBU1 B5=CC2 | not used | |
| A9/B4 | 24V! Vbus | Switched 24V | |
| A10/B3 | NC | ||
| A11/B2 | NC | ||
| A12/B1 | GND |
Display
Type: xx Pin FFC
RGB888 display + touch\
unknown pinout
Front USB
Type: USB-A
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | GND | GND | regular usb-A port |
| 2 | DP | DP | |
| 3 | DM | DM | |
| 4 | 5v | +5V |
Z-endstop (Marked "EXT" on the board)
Type: JST-XHB-3P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | +24V | ||
| 2 | GND | ||
| 3 | SIG | 3.3V pullup, LOW/0v when bed is not in sensor |
Mainboard fan "BFAN"
Type: JST-XHB-3P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | +24V | ||
| 2 | GND_PWM | Controlled by MCU | |
| 3 | Tacho |
Bed MCU (RS-232)
Type: JST-XHB-5P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | 24V | +24V | Not used on the leveling mcu board |
| 2 | GND | GND | |
| 3 | 5V | +5V | 5v is switched to reset the bed MCU |
| 4 | TX | TX | |
| 5 | RX | RX |
Bed heater "HBED"
Type: JST-XHB-2P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | - | GND_PWM | Controlled by MCU |
| 2 | + | +24V |
Bed temperature sensoor "BED-T"
Type: JST-XHB-2P
| pin nr | marking | Function | remarks |
|---|---|---|---|
| 1 | SIG | NTC100k B3950 | |
| 2 | GND |