Hardware Pinout Reference¶

This reference documents the hardware pin assignments across the microcontroller targets deployed in the fleet.

ESP32-C3 SuperMini (12×6 Carrier)¶

The ESP32-C3 is a single-core RISC-V 32-bit MCU with 400KB SRAM and 4MB Flash.

Function	GPIO Pin	Bus / Signal	Description
Display SPI SCK	`GPIO4`	Hardware SPI Bus A	Clock signal to WeAct e-paper
Display SPI MOSI	`GPIO6`	Hardware SPI Bus A	Master-Out-Slave-In data to display
Display SPI MISO	`GPIO5`	Hardware SPI Bus A	Master-In-Slave-Out (optional)
Display CS	`GPIO7`	Chip Select	Active-low display enable
Display DC	`GPIO1`	Data / Command	Selects register command vs data
Display RST	`GPIO2`	Hardware Reset	Active-low display reset
Display BUSY	`GPIO3`	Status Line	Busy signal from SSD1680 controller
Sensor I2C SDA	`GPIO8`	Hardware I2C Bus B	Data line for BME280 & SGP40
Sensor I2C SCL	`GPIO9`	Hardware I2C Bus B	Clock line for BME280 & SGP40
Ambient Light ADC	`GPIO0`	ADC1_CH0	Analog voltage from TEMT6000 phototransistor

The ESP32-C6 features Wi-Fi 6, Bluetooth 5.3, Zigbee, and Thread.

Function	GPIO Pin	Bus / Signal	Description
Display SPI SCK	`GPIO6`	Hardware SPI Bus	Clock signal to 1.54" e-paper
Display SPI MOSI	`GPIO7`	Hardware SPI Bus	Master-Out-Slave-In data
Display SPI MISO	`GPIO2`	Hardware SPI Bus	Master-In-Slave-Out data
Display CS	`GPIO20`	Chip Select	Active-low display select (`alichino`, `leviathan`)
Display DC	`GPIO21`	Data / Command	Mode select line
Display RST	`GPIO22`	Hardware Reset	Display reset
Display BUSY	`GPIO23`	Status Line	Busy state
BME680 SPI CS	`GPIO19`	Chip Select	Dedicated SPI select line for BME680
Ambient Light ADC	`GPIO0`	ADC1_CH0	Analog voltage from TEMT6000

Used on nodes such as dust-front, dust-kitchen, kitchen, and garden:

Function	Pin Name	Physical GPIO	Hardware Role
Dust Sensor RX	`D2`	`GPIO4`	Software/Hardware UART RX from PM1006 dust sensor (9600 baud)
Dust Sensor TX	`D1`	`GPIO5`	UART TX (optional configuration)
Climate I2C SDA	`D3`	`GPIO0`	I2C Data line for external BME280 weather breakout
Climate I2C SCL	`D4`	`GPIO2`	I2C Clock line for BME280
Status LED	`D0`	`GPIO16`	On-board activity / Wi-Fi indicator

Used in atom_matrix.yaml (gutenberg):

Peripheral	GPIO Pin	Notes
5×5 RGB LED Matrix	`GPIO27`	FastLED NeoPixel / WS2812 driver rail
Onboard Button	`GPIO39`	Front panel tactile momentary switch
Internal SHT30 SDA	`GPIO25`	Hardware I2C data
Internal SHT30 SCL	`GPIO21`	Hardware I2C clock
IR Transmitter	`GPIO12`	Infrared emitter LED