M5Stamp C3

The M5Stamp-C3 is a development board based on the Espressif ESP32C3 32-bit RISC-V CPU microcontroller with 400KB of SRAM and 4MB of onboard flash storage. Thanks to the onboard radio, it supports both WiFi and Bluetooth wireless communication.

Interfaces

Interface	Hardware Supported	TinyGo Support
GPIO	YES	YES
UART	YES	YES
SPI	YES	YES
I2C	YES	Not yet
ADC	YES	YES
PWM	YES	YES
USBDevice	YES	YES
WiFi	YES	YES
Bluetooth	YES	Not yet

Pins

Pin	Hardware pin	Alternative names
`IO0`	`GPIO0`	`XTAL_32K_P`, `ADC0`
`IO1`	`GPIO1`	`XTAL_32K_N`, `ADC1`
`IO2`	`GPIO2`	`WS2812`, `ADC2`
`IO3`	`GPIO3`	`ADC3`
`IO4`	`GPIO4`	`MTMS`, `ADC4`
`IO5`	`GPIO5`	`MTDI`, `ADC5`
`IO6`	`GPIO6`	`MTCK`
`IO7`	`GPIO7`	`MTDO`
`IO8`	`GPIO8`
`IO9`	`GPIO9`
`IO10`	`GPIO10`
`IO11`	`GPIO11`	`VDD_SPI`
`IO12`	`GPIO12`	`SPIHD`
`IO13`	`GPIO13`	`SPISP`
`IO14`	`GPIO14`	`SPICS0`
`IO15`	`GPIO15`	`SPICLK`
`IO16`	`GPIO16`	`SPID`
`IO17`	`GPIO17`	`SPIQ`
`IO18`	`GPIO18`
`IO19`	`GPIO19`
`IO20`	`GPIO20`	`U0RXD`, `UART_RX_PIN`
`IO21`	`GPIO21`	`U0TXD`, `UART_TX_PIN`

Machine Package Docs

Documentation for the machine package for the M5Stamp-C3

Flashing

CLI Flashing

In addition, you must install the esptool flashing tool:

https://github.com/espressif/esptool#easy-installation

Now you should be able to flash your board as follows:

Plug your ESP32-C3 board into your computer’s USB port.
Build and flash your TinyGo code using the tinygo flash command. This command flashes the ESP32-C3 with the serial example:
```
tinygo flash -target=m5stack-core2 examples/serial
```
The ESP32-C3 board should restart and then begin running your program.

Troubleshooting

Goes here

Notes

WiFi

You can use the onboard wireless chip for WiFi using the espradio package.

For more information, see https://github.com/tinygo-org/espradio

Last modified April 20, 2026: reference: update flashing instructions for all ESP32/ESP8266 boards (8de5c72)