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Espressif ESP32-C3-DevKitM-1
Compact official ESP32-C3 dev board with RISC-V core - perfect for secure, low-power IoT and BLE applications.
38.91 × 25.4 mm
ESP32-C3
RISC-V MCU
160MHz
clock
4MB
flash
400KB
SRAM
15· 6 ADC
GPIO
BLE 5.0+ WiFi
radio
Pinout
30 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | GND | ground | - | Ground |
| 2 | - | 3V33.3V | power | - | 3.3V regulated output |
| 3 | - | 3V33.3V | power | - | 3.3V regulated output |
| 4 | 2 | IO2A2 | strapping | adc · pwm | ADC1_CH2; FSPIQ |
| 5 | 3 | IO3A3 | safe | adc · pwm | ADC1_CH3 |
| 6 | - | GND | ground | - | Ground |
| 7 | - | RSTEN | control | - | Chip reset (active low) |
| 8 | - | GND | ground | - | Ground |
| 9 | 0 | IO0A0 | safe | adc · pwm | ADC1_CH0; RTC; XTAL_32K |
| 10 | 1 | IO1A1 | safe | adc · pwm | ADC1_CH1; RTC; XTAL_32K |
| 11 | 10 | IO10 | safe | pwm | General-purpose GPIO; FSPICS0 |
| 12 | - | GND | ground | - | Ground |
| 13 | - | 5V | power | - | 5V input (from USB) / output |
| 14 | - | 5V | power | - | 5V input (from USB) / output |
| 15 | - | GND | ground | - | Ground |
| 16 | - | GND | ground | - | Ground |
| 17 | 21 | IO21TX | uart | uart · pwm | UART0 TX |
| 18 | 20 | IO20RX | uart | uart · pwm | UART0 RX |
| 19 | - | GND | ground | - | Ground |
| 20 | 9 | IO9SCL | strapping | i2c · pwm | BOOT button; default I2C SCL |
| 21 | 8 | IO8SDA | strapping | i2c · pwm | Onboard RGB LED; default I2C SDA |
| 22 | - | GND | ground | - | Ground |
| 23 | 7 | IO7SS | strapping | spi · pwm | SPI SS; JTAG MTDO |
| 24 | 6 | IO6MOSI | strapping | spi · pwm | SPI MOSI; JTAG MTCK |
| 25 | 5 | IO5A5MISO | strapping | adc · spi · pwm | ADC2_CH0; SPI MISO; JTAG MTDI |
| 26 | 4 | IO4A4SCK | strapping | adc · spi · pwm | ADC1_CH4; SPI SCK; JTAG MTMS |
| 27 | - | GND | ground | - | Ground |
| 28 | 18 | IO18 | uart | pwm | USB D- (native USB Serial/JTAG) |
| 29 | 19 | IO19 | uart | pwm | USB D+ (native USB Serial/JTAG) |
| 30 | - | GND | ground | - | Ground |
Start with these
4 pins with no boot or system involvementIO3A3IO0A0IO1A1IO10
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 |
| 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 |
| IO7 | MTDO | Used during boot; JTAG TDO for debugging; acts as Quad-SPI flash IO (data line) in internal-flash variants | JTAG |
| IO6 | MTCK | Used during boot; JTAG TCK for debugging; provides flash clock 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 |
| IO4 | MTMS | Used during boot; JTAG TMS for debugging; acts as Quad-SPI flash IO (hold data line) in internal-flash variants | JTAG |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| 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 |
| 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 |
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-DevKitM-1 pinout brings out 30 pins at a 2.54 mm pitch - 15 usable GPIO alongside the GND , 3V3 and 5V power rails. Peripheral wiring is…
The Espressif ESP32-C3-DevKitM-1 pinout brings out 30 pins at a 2.54 mm pitch - 15 usable GPIO alongside the GND, 3V3 and 5V power rails.
Peripheral wiring is straightforward: I²C is mapped to SDA on GPIO8 and SCL on GPIO9; the SPI bus (MOSI, MISO, SCK, SS) is broken out in full; 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.
9 of the exposed pins carry boot-time or system duties on the ESP32-C3 (IO2, IO21, IO20 and 6 more) - check the guidance above before wiring anything to them. IO3, IO0, IO1 and IO10 are free of any such role - the safest first picks.
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Install your USB-serial driver (CH340 / CP210x) 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 GPIO3 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"▸
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 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(3, OUTPUT);
}
void loop() {
digitalWrite(3, HIGH); delay(500);
digitalWrite(3, LOW); delay(500);
}board to selectesp32-c3-devkitm-1⧉ copy
[env:esp32-c3-devkitm-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_devkitm_1
framework:
type: esp-idf
# blink - GPIO3
output:
- platform: gpio
pin: 3
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).Specifications
ESP32-C3 · 38.91 × 25.4 mmCompute
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
Micro-USB
Serial
CP2102N
Boot address
0x0
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · DIO
Sketch · Data
- · 320 KB
38.91 × 25.4 mm · pin pitch 2.54 mm
The Espressif ESP32-C3-DevKitM-1 uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with DIO boot mode.
About this board
Inside sits the ESP32-C3 - a single-core RISC-V and the budget low-power pick.
The $10.00 price tag is typical for an ESP32-C3 board.
Around the module: an addressable RGB LED (GPIO8) and Boot/Reset buttons.
Where to buy
prices are typical street pricesAs an Amazon Associate, ESPboards earns from qualifying purchases.
Resources
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