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M5Stick-C
Tiny ESP32 wearable-ready dev kit with display, IMU, and battery - perfect for on-the-go sensor projects.
48.2 × 25.5 mm
ESP32
MCU
240MHz
clock
4MB
flash
520KB
SRAM
16· Two 12-bit, 18 Channels ADC
GPIO
BLE 4.2+ WiFi
radio
Pinout
16 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 0 | G0 | strapping | - | |
| 2 | 1 | TXPWM | uart | uart | |
| 3 | 3 | RXPWM | uart | uart | |
| 4 | 5 | SSPWM | strapping | spi | |
| 5 | 9 | G9PWM | strapping | - | |
| 6 | 10 | G10PWM | strapping | - | |
| 7 | 13 | SCKPWM | strapping | spi | |
| 8 | 15 | MOSIPWM | strapping | spi | |
| 9 | 25 | DAC1PWM | safe | dac | |
| 10 | 26 | G26DAC2PWM | safe | dac | |
| 11 | 32 | RXD2SDAG32PWM | safe | i2c | |
| 12 | 33 | TXD2SCLG33PWM | safe | i2c | |
| 13 | 35 | ADC1 | strapping | - | |
| 14 | 36 | MISOG36ADC2 | strapping | spi | |
| 15 | 37 | G37 | strapping | - | |
| 16 | 39 | G39 | strapping | - |
Start with these
4 pins with no boot or system involvementDAC1PWMG26DAC2RXD2SDATXD2SCL
Freely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| G0 | GPIO0 | Must be HIGH during boot for normal startup; if held LOW on reset, forces flash programming mode. | Strapping |
| SS | GPIO5 | Must be HIGH during boot; if pulled LOW at reset, alters SDIO slave timing and may prevent normal boot. | Strapping |
| SCK | MTCK (GPIO13) | Used for JTAG debugging (TCK); avoid using as GPIO if JTAG is needed. | Other |
| MOSI | MTDO (GPIO15) | Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change. | Strapping |
| ADC1 | GPIO35 | Cannot be used as output; only suitable for input. | Other |
| MISO | GPIO36 (SENSOR_VP) | Cannot be used as output; only suitable for input (e.g., analog read). | Other |
| G37 | GPIO37 (SENSOR_CAPP) | Cannot be used as output; only suitable for input. | Other |
| G39 | GPIO39 (SENSOR_VN) | Cannot be used as output; only suitable for input. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| TX | U0TXD (GPIO1) | Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console. | USB |
| RX | U0RXD (GPIO3) | Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads. | USB |
| G9 | GPIO9 (Flash SD2) | Used by internal flash/PSRAM; typically not exposed on modules, avoid using as GPIO. | Flash |
| G10 | GPIO10 (Flash SD3) | Used by internal flash/PSRAM; typically not exposed on modules, avoid using as GPIO. | Flash |
These are recommendations, not hard rules - with the right pull-ups, timing and boot-state awareness most pins can be made to work. When in doubt, start green.
Pinout notes The M5Stick-C pinout brings out 16 GPIO pins - every one of them usable in your project. For peripherals, I²C is mapped to SDA on GPIO32 and SCL on GPIO33; the…
The M5Stick-C pinout brings out 16 GPIO pins - every one of them usable in your project.
For peripherals, I²C is mapped to SDA on GPIO32 and SCL on GPIO33; the SPI bus (MOSI, MISO, SCK, SS) is broken out in full; TX/RX on GPIO1 and GPIO3 cover serial logging and flashing.
On the analog side there are 2 true DAC outputs.
If you want zero surprises, DAC1, G26, RXD2 and TXD2 are free of any such role - the safest first picks. 8 of the exposed pins carry boot-time or system duties on the ESP32 (G0, SS, SCK and 5 more).
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Uses a CP2104 bridge - install the CP210x driver if no port appears. Not detected? Hold BOOT while plugging in.
2
Match & flash
Set the Tools options shown, then click Upload.
3
Verify it runs
The onboard LED on GPIO25 blinks - swap the pin if your board's LED differs.
Set these in Tools · leave everything else at default
Arduino IDE 2.x — Tools Copy
Board: "ESP32 Dev Module"▸
Flash Size: "4MB (32Mb)"▸
Flash Mode: "DIO"▸
Partition Scheme: "Default 4MB with spiffs (1.2MB APP / 1.5MB SPIFFS)" (default)▸
Upload Speed: "921600"▸
▸ every other Tools option — leave at default
Board: ESP32 Dev Module Flash Size: 4MB (32Mb) Flash Mode: DIO Partition Scheme: Default 4MB with spiffs (1.2MB APP / 1.5MB SPIFFS) Upload Speed: 921600
Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32 Dev Module
// blink the onboard LED
void setup() {
pinMode(25, OUTPUT);
}
void loop() {
digitalWrite(25, HIGH); delay(500);
digitalWrite(25, LOW); delay(500);
}board to selectesp32dev⧉ copy
[env:m5stick-c]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600Find it: PlatformIO Home ▸ Boards, search
esp32dev — or type it after board =.board to selectesp32dev⧉ copy
esp32:
board: esp32dev
variant: m5stick_c
framework:
type: esp-idf
# blink - GPIO25
output:
- platform: gpio
pin: 25
id: led_out
light:
- platform: binary
name: "LED"
output: led_outFind it: search ESPHome's board list for
esp32dev (same ids as PlatformIO).esptool doesn't pick board settings — a prebuilt .bin already has them baked in. This is just the raw flash command.
esptool.py --chip esp32 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Build details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32 · 48.2 × 25.5 mmCompute
MCU
ESP32
Clock
240 MHz
SRAM · Flash
520 KB · 4MB
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
4.2 LE
Antenna
PCB
I/O
GPIO · ADC
16 · Two 12-bit, 18 Channels
UART · I²C · SPI
3 · 2 · 4
PWM
16 channels
Power
USB
USB-C
Serial
CP2104
Boot address
0x1000
Display
Screen
TFT · 0.96" · 80x160
Driver
ST7735S
Touch
No
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.25 MB · 320 KB
48.2 × 25.5 mm
The M5Stick-C uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with DIO boot mode. The maximum sketch size is 1.25 MB with 320 KB available for data.
About this board
At its core is the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.
Expect to pay about $9.95 - less than the ~$20 most ESP32 boards go for.
Only 16 GPIO are broken out, where most ESP32 boards manage about 24 - worth checking the pinout covers what you need.
Onboard you'll find a TFT 0.96" 80x160 display, a Grove connector, a microphone (SPM1423), an MPU6886 IMU, a BM8563 RTC, an IR transceiver, battery charging (AXP192) and BtnA/BtnB/Power buttons.
- 95mAh LiPo battery
- AXP192 PMIC for power management and battery gauge
- Early units shipped with SH200Q IMU (later revisions use MPU6886)
Where to buy
prices are typical street pricesResources
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