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Espressif ESP32-C3-DevKit-RUST-1
Rust-optimized ESP32-C3 board from Espressif - great for embedded developers targeting low-level performance.
ESP32-C3
RISC-V MCU
160MHz
clock
4MB
flash
400KB
SRAM
15· 6 ADC
GPIO
BLE 5.0+ WiFi
radio
Pinout
28 pins
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | RST | control | - | Chip reset (active low) |
| 2 | - | 3V33.3V | power | - | 3.3V regulated output |
| 3 | - | NC | - | Not connected | |
| 4 | - | GND | ground | - | Ground |
| 5 | 0 | IO0A0 | safe | adc · pwm | ADC1_CH0 |
| 6 | 1 | IO1A1 | safe | adc · pwm | ADC1_CH1 |
| 7 | 2 | IO2A2 | strapping | adc · pwm | ADC1_CH2; onboard WS2812 RGB LED data |
| 8 | 3 | IO3A3 | safe | adc · pwm | ADC1_CH3 |
| 9 | 4 | IO4A4 | strapping | adc · pwm | ADC1_CH4; JTAG MTMS |
| 10 | 5 | IO5A5 | strapping | adc · pwm | ADC2_CH0; JTAG MTDI |
| 11 | 6 | IO6 | strapping | pwm | JTAG MTCK |
| 12 | 7 | IO7 | strapping | pwm | Onboard user LED; JTAG MTDO |
| 13 | 8 | IO8SCL | strapping | i2c · pwm | I2C SCL to onboard ICM-42670 IMU and SHTC3 temp/humidity sensor |
| 14 | 21 | IO21TX | uart | uart · pwm | UART0 TX |
| 15 | 20 | IO20RX | uart | uart · pwm | UART0 RX |
| 16 | 9 | IO9 | strapping | pwm | BOOT button |
| 17 | - | BAT+ | power | - | Li-ion battery input (via MCP73831 charger) |
| 18 | - | EN | control | - | Chip enable (active high) |
| 19 | - | 5V | power | - | 5V input (from USB) / output |
| 20 | - | NC | - | Not connected | |
| 21 | - | NC | - | Not connected | |
| 22 | - | NC | - | Not connected | |
| 23 | - | NC | - | Not connected | |
| 24 | - | NC | - | Not connected | |
| 25 | 19 | IO19 | uart | pwm | USB D+ (native USB Serial/JTAG) |
| 26 | 18 | IO18 | uart | pwm | USB D- (native USB Serial/JTAG) |
| 27 | 8 | IO8SCL | strapping | i2c · pwm | I2C SCL to onboard ICM-42670 IMU and SHTC3 temp/humidity sensor |
| 28 | 10 | IO10SDA | safe | i2c · pwm | I2C SDA to onboard ICM-42670 IMU and SHTC3 temp/humidity sensor |
Start with these
4 pins with no boot or system involvementIO0A0IO1A1IO3A3IO10SDA
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 |
|---|---|---|---|
| IO2 | GPIO2 | Must be held high during boot (if low on reset, normal flash boot may fail) | Strapping |
| IO4 | MTMS | Used during boot; JTAG TMS for debugging; acts as Quad-SPI flash IO (hold data line) in internal-flash variants | JTAG |
| IO5 | MTDI | Used during boot; JTAG TDI for debugging; acts as Quad-SPI flash IO (write-protect data line) in internal-flash variants | JTAG |
| IO6 | MTCK | Used during boot; JTAG TCK for debugging; provides flash clock in internal-flash variants | JTAG |
| IO7 | MTDO | Used during boot; JTAG TDO for debugging; acts as Quad-SPI flash IO (data line) in internal-flash variants | JTAG |
| IO8 | GPIO8 | Must be held high during reset (if low, UART flashing/boot may not work) | Strapping |
| IO21 | U0TXD | Used as UART0 transmit (console/bootloader); repurposing may disable serial console output and printing | UART |
| IO20 | U0RXD | Used as UART0 receive (console/bootloader); repurposing may disable serial programming and debug logs | UART |
| IO9 | GPIO9 | Controls boot mode on reset (HIGH for normal flash boot, LOW enters serial download mode) | Strapping |
| IO8 | GPIO8 | Must be held high during reset (if low, UART flashing/boot may not work) | Strapping |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| IO19 | USB_D+ | By default connected to on-chip USB Serial/JTAG controller; not available for GPIO use unless USB functionality is disabled or remapped | USB |
| IO18 | USB_D- | By default connected to on-chip USB Serial/JTAG controller; to use as GPIO it must be reconfigured from its USB function | USB |
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 Espressif ESP32-C3-DevKit-RUST-1 pinout brings out 28 pins - 16 usable GPIO alongside the 3V3 , GND , BAT+ and 5V power rails. Peripheral wiring is…
The Espressif ESP32-C3-DevKit-RUST-1 pinout brings out 28 pins - 16 usable GPIO alongside the 3V3, GND, BAT+ and 5V power rails.
Peripheral wiring is straightforward: I²C is mapped to SDA on GPIO10 and SCL on GPIO8, while TX/RX on GPIO21 and GPIO20 cover serial logging and flashing.
Beyond plain digital I/O you get 6 ADC-capable pins for sensors and battery monitoring and PWM on every GPIO.
10 of the exposed pins carry boot-time or system duties on the ESP32-C3 (IO2, IO4, IO5 and 7 more) - check the guidance above before wiring anything to them. IO0, IO1, IO3 and IO10 are free of any such role - the safest first picks.
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Native USB - shows up as a port right away, no driver needed. 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 GPIO0 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: "ESP32C3 Dev Module"▸
USB CDC On Boot: "Enabled"▸
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: ESP32C3 Dev Module USB CDC On Boot: Enabled 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 ▸ ESP32C3 Dev Module
// blink the onboard LED
void setup() {
pinMode(0, OUTPUT);
}
void loop() {
digitalWrite(0, HIGH); delay(500);
digitalWrite(0, LOW); delay(500);
}board to selectesp32-c3-devkitm-1⧉ copy
[env:esp32-c3-devkit-rust-1]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600Find it: PlatformIO Home ▸ Boards, search
esp32-c3-devkitm-1 — or type it after board =.board to selectesp32-c3-devkitm-1⧉ copy
esp32:
board: esp32-c3-devkitm-1
variant: esp32_c3_devkit_rust_1
framework:
type: esp-idf
# blink - GPIO0
output:
- platform: gpio
pin: 0
id: led_out
light:
- platform: binary
name: "LED"
output: led_outFind it: search ESPHome's board list for
esp32-c3-devkitm-1 (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 esp32c3 --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-C3Compute
MCU
ESP32-C3 · RISC-V
Clock
160 MHz
SRAM · Flash
400 KB · 4MB
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
5.0 LE
Antenna
PCB
I/O
GPIO · ADC
15 · 6
UART · I²C · SPI
2 · 1 · 3
PWM
6 channels
Power
USB
USB-C
Serial
Native (CDC)
Boot address
0x0
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
1.25 MB · 320 KB
The Espressif ESP32-C3-DevKit-RUST-1 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
Inside sits the ESP32-C3 - a single-core RISC-V and the budget low-power pick.
At $19.95 it's on the expensive side for an ESP32-C3 board - most land around $10.
Around the module: an ICM-42670-P IMU, an addressable RGB LED (GPIO2), an environmental sensor (SHTC3), battery charging (MCP73831) and Reset/Boot buttons.
It flashes over native USB - no serial-converter driver needed, which isn't a given among ESP32-C3 boards.
The ESP32-C3-DevKit-RUST-1 is an entry-level development board based on the ESP32-C3-MINI-1 module, featuring a 32-bit RISC-V single-core processor with Wi-Fi and Bluetooth 5 (LE) capabilities. Designed to demonstrate Rust programming capabilities, it includes a 6-DoF IMU, a temperature and humidity sensor, a Li-Ion battery charger, and a Type-C USB connector, making it ideal for IoT applications and embedded systems.
Where to buy
prices are typical street pricesEspressif ESP32-C3-DevKit-RUST-1
$19.95per unit, typical
Resources
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