The following lists some of the unused electrical ports and pins, with information sourced from Bigtreetech and compiled by SIBOOR for reference purposes only. We do not guarantee that all functions can be activated or used, and we cannot provide technical support beyond what is included in the kit.
The 40-pin GPIO (General Purpose Input/Output) interface on the CB2 is a versatile connection point that supports a range of uses and functions. Here is a description of each pin:
Number
Pinout
Number
Pinout
1
3.3V
21
5V
2
GPIO4_B2
22
5V
3
GPIO4_B3
23
GND
4
GPIO3_A1
24
GIPIO0_D1
5
GND
25
GIPIO0_D0
6
GPIO0_C7
26
GIPIO0_B0
7
GPIO1_A0
27
GND
8
GPIO1_A1
28
GIPIO4_C6
9
3.3V
29
GIPIO4_A3
10
GPIO3_C1
30
GND
11
GPIO3_C2
31
GIPIO0_C4
12
GPIO3_C3
32
GIPIO0_A2
13
GND
33
GIPIO0_A6
14
GPIO0_B4
34
GIPIO0_B3
15
GPIO3_D6
35
GND
16
GPIO3_D7
36
GIPIO0_C1
17
GPIO0_C0
37
GND
18
GPIO4_C5
38
GIPIO0_A0
19
GPIO0_C3
39
GIPIO4_C3
20
GND
40
GIPIO4_C2
GPIO Function Description
GPIO: Configurable as input or output for receiving or sending digital signals.
3.3V/5V: Provides power voltage; 3.3V is typically used for logic levels, while 5V is used for peripherals requiring higher voltage.
GND: Ground, used to complete the circuit.
PWM: Generates Pulse Width Modulation signals, typically used for controlling motor speed, brightness, etc.
UART: Used for serial communication to send and receive data.
I2C: Used for communication with I2C-compatible devices (e.g., sensors, EEPROM).
SPI: Used for high-speed data transfer, communicating with SPI-compatible devices (e.g., displays, sensors).
