Espressif ESP32-C3-DevKit-RUST-1
Rust-optimized ESP32-C3 board from Espressif - great for embedded developers targeting low-level performance.
Espressif ESP32-C3-DevKit-RUST-1 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 involvementFreely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
10 pins · 9 things to knowIO2 Strapping pin, but it does not select the boot mode - GPIO9 does. Espressif only recommend pulling it up against reset-time glitches. Floating by default. Strapping
A strapping pin: Espressif recommend an external pull-up against glitches at reset, so avoid heavy capacitive loads or a strong low drive here. It does not put the chip into download mode (that is GPIO9).
IO4 Bootstrapping pin; JTAG TMS; Flash data (FSPIHD in internal-flash models) JTAG
Used during boot; JTAG TMS for debugging; acts as Quad-SPI flash IO (hold data line) in internal-flash variants
IO5 Bootstrapping pin; JTAG TDI; Flash data (FSPIWP in internal-flash models) JTAG
Used during boot; JTAG TDI for debugging; acts as Quad-SPI flash IO (write-protect data line) in internal-flash variants
IO6 Bootstrapping pin; JTAG TCK; Flash clock (FSPICLK in internal-flash models) JTAG
Used during boot; JTAG TCK for debugging; provides flash clock in internal-flash variants
IO7 Bootstrapping pin; JTAG TDO; Flash data (FSPID in internal-flash models) JTAG
Used during boot; JTAG TDO for debugging; acts as Quad-SPI flash IO (data line) in internal-flash variants
IO8IO8 Bootstrapping pin (needs HIGH at reset); also gates ROM boot message printing (UART_PRINT_CONTROL efuse) Strapping
Must be held high during reset (if low, UART flashing/boot may not work)
- IO8Bootstrapping pin (needs HIGH at reset); also gates ROM boot message printing (UART_PRINT_CONTROL efuse)
- IO8Bootstrapping pin (needs HIGH at reset); also gates ROM boot message printing (UART_PRINT_CONTROL efuse)
IO21 UART0 TXD (default serial output) UART
Used as UART0 transmit (console/bootloader); repurposing may disable serial console output and printing
IO20 UART0 RXD (default serial input) UART
Used as UART0 receive (console/bootloader); repurposing may disable serial programming and debug logs
IO9 Bootstrapping pin; selects boot mode (HIGH = SPI flash boot, LOW = UART download) Strapping
Controls boot mode on reset (HIGH for normal flash boot, LOW enters serial download mode)
Only if you know the tricks
2 pins · 2 things to knowIO19 USB D+ line (USB Serial/JTAG interface) USB
By default connected to on-chip USB Serial/JTAG controller; not available for GPIO use unless USB functionality is disabled or remapped
IO18 USB D- line (USB Serial/JTAG interface) USB
By default connected to on-chip USB Serial/JTAG controller; to use as GPIO it must be reconfigured from its USB function
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 minutesBoard: 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
// toggle GPIO0 - wire an LED and resistor to it
void setup() {
pinMode(0, OUTPUT);
}
void loop() {
digitalWrite(0, HIGH); delay(500);
digitalWrite(0, LOW); delay(500);
}[env:esp32-c3-devkit-rust-1]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32-c3-devkitm-1 - or type it after board =.esp32:
board: esp32-c3-devkitm-1
variant: esp32c3
framework:
type: esp-idf
# blink - GPIO0
output:
- platform: gpio
pin: 0
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesp32-c3-devkitm-1 (same ids as PlatformIO).esptool.py --chip esp32c3 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Specifications
ESP32-C3 · vs other ESP32 chips →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 pricesResources
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