Pin Diagram

The Mecha Comet device features a versatile General-Purpose Input/Output (GPIO) interface, allowing users to connect and control a wide range of peripherals, sensors, and communication modules. The GPIO pins support multiple protocols, including UART, I2C, SPI, ADC, USB and PWM, making it a flexible solution for embedded applications.

Below is the pin diagram illustrating the available connections on the Mecha Comet device:

Pin Table

The following table provides a detailed breakdown of each pin's function and possible usage:

Pin Number	IO	Description
1	5V	Power supply (5V output).
2	USB DM	USB Data Minus (D-) for USB communication.
3	USB DP	USB Data Plus (D+) for USB communication.
4	GND	Ground connection.
5	UART3_TX	Transmit (TX) pin for UART3, used for serial communication.
6	UART3_RX	Receive (RX) pin for UART3, used for serial communication.
7	GPIO2_IO12	gpio (active low).
8	I2C2_SCL	Clock (SCL) line for I2C2 communication bus.
9	I2C2_SDA	Data (SDA) line for I2C2 communication bus.
10	3V3	Power supply (3.3V output/input depending on the design).
11	ADC1	Analog-to-Digital Converter input channel 1.
12	ADC2	Analog-to-Digital Converter input channel 2.
13	PWM1	Pulse Width Modulation (PWM) output channel 1.
14	DBG_TX	Debug UART transmit pin, typically used for logging/debugging.
15	DBG_RX	Debug UART receive pin, typically used for logging/debugging.
16	GPIO2_IO15	gpio (active low).
17	GPIO2_IO16	gpio (active low).
18	GPIO2_IO17	gpio (active low).
19	GPIO2_IO18	gpio (active low).
20	GPIO4_IO28	gpio (active low).
21	3V3	Power supply (3.3V output/input depending on the design).
22	I2C4_SCL	Clock (SCL) line for I2C4 communication bus.
23	I2C4_SDA	Data (SDA) line for I2C4 communication bus.
24	GPIO2_IO20	gpio (active low).
25	UART4_RX	Receive (RX) pin for UART4, used for serial communication.
26	UART4_TX	Transmit (TX) pin for UART4, used for serial communication.
27	GND	Ground connection.
28	RTC	Real-Time Clock input, typically used for battery backup or external clock signals.
29	SOM_RST	System-on-Module reset signal (active low).
30	5V	Power supply (5V output/input depending on the design).
31	GPIO1_IO13	gpio (active low).
32	ESPI2_MOSI	SPI2 Master Out Slave In signal for SPI communication.
33	ESPI2_MISO	SPI2 Master In Slave Out signal for SPI communication.
34	ESPI2_SCLK	SPI2 clock signal for SPI communication.
35	ESPI2_SS0	SPI2 chip select signal (Slave Select 0).
36	GPIO2_IO14	gpio (active low).
37	GPIO2_IO13	gpio (active low).
38	PWM2	Pulse Width Modulation (PWM) output channel 2 (alternative pin).
39	ADC3	Analog-to-Digital Converter input channel 3.
40	ADC4	Analog-to-Digital Converter input channel 4.

Notes

• Power Pins (5V & 3.3V): These provide power to external peripherals.
• GND (Ground Pins): Must be used as a common reference point for electrical circuits.
• UART (Universal Asynchronous Receiver-Transmitter): Used for serial communication.
• I2C (Inter-Integrated Circuit): A common communication protocol for sensors and peripherals.
• SPI (Serial Peripheral Interface): A high-speed serial communication protocol used for displays and storage devices.
• GPIO (General Purpose Input/Output): Configurable digital input/output pins.
• PWM (Pulse Width Modulation): Used to control brightness, motors, and servos.
• ADC (Analog-to-Digital Converter): Converts analog signals (e.g., from sensors) into digital values.