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Espressif ESP32-C3-DevKitC-02
Full-featured ESP32-C3 dev board with USB and debug headers - ideal for prototyping and embedded systems.
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 | - | RSTEN | control | - | Chip reset (active low) |
| 5 | - | GND | ground | - | Ground |
| 6 | 4 | IO4A4SCK | strapping | adc · spi · pwm | ADC1_CH4; SPI SCK; JTAG MTMS |
| 7 | 5 | IO5A5MISO | strapping | adc · spi · pwm | ADC2_CH0; SPI MISO; JTAG MTDI |
| 8 | 6 | IO6MOSI | strapping | spi · pwm | SPI MOSI; JTAG MTCK |
| 9 | 7 | IO7SS | strapping | spi · pwm | SPI SS; JTAG MTDO |
| 10 | - | GND | ground | - | Ground |
| 11 | 8 | IO8SDA | strapping | i2c · pwm | Onboard RGB LED; default I2C SDA |
| 12 | 9 | IO9SCL | strapping | i2c · pwm | BOOT button; default I2C SCL |
| 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 | 0 | IO0A0 | safe | adc · pwm | ADC1_CH0; RTC; XTAL_32K |
| 18 | 1 | IO1A1 | safe | adc · pwm | ADC1_CH1; RTC; XTAL_32K |
| 19 | 2 | IO2A2 | strapping | adc · pwm | ADC1_CH2; FSPIQ |
| 20 | 3 | IO3A3 | safe | adc · pwm | ADC1_CH3 |
| 21 | - | GND | ground | - | Ground |
| 22 | 10 | IO10 | safe | pwm | General-purpose GPIO; FSPICS0 |
| 23 | - | GND | ground | - | Ground |
| 24 | 20 | IO20RX | uart | uart · pwm | UART0 RX |
| 25 | 21 | IO21TX | uart | uart · pwm | UART0 TX |
| 26 | - | GND | ground | - | Ground |
| 27 | 18 | IO18 | uart | pwm | USB D- (native USB Serial/JTAG) |
| 28 | 19 | IO19 | uart | pwm | USB D+ (native USB Serial/JTAG) |
| 29 | - | GND | ground | - | Ground |
| 30 | - | GND | ground | - | Ground |
Start with these
4 pins with no boot or system involvementIO0A0IO1A1IO3A3IO10
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 |
|---|---|---|---|
| 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 |
| IO9 | GPIO9 | Controls boot mode on reset (HIGH for normal flash boot, LOW enters serial download mode) | Strapping |
| IO2 | GPIO2 | Must be held high during boot (if low on reset, normal flash boot may fail) | Strapping |
| IO20 | U0RXD | Used as UART0 receive (console/bootloader); repurposing may disable serial programming and debug logs | UART |
| IO21 | U0TXD | Used as UART0 transmit (console/bootloader); repurposing may disable serial console output and printing | UART |
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-DevKitC-02 pinout brings out 30 pins at a 2.54 mm pitch - 15 usable GPIO alongside the GND , 3V3 and 5V power rails. For peripherals,…
The Espressif ESP32-C3-DevKitC-02 pinout brings out 30 pins at a 2.54 mm pitch - 15 usable GPIO alongside the GND, 3V3 and 5V power rails.
For peripherals, 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.
On the analog side there are 6 ADC-capable pins for sensors and battery monitoring and PWM on every GPIO.
If you want zero surprises, IO0, IO1, IO3 and IO10 are free of any such role - the safest first picks. 9 of the exposed pins carry boot-time or system duties on the ESP32-C3 (IO4, IO5, IO6 and 6 more).
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Serial chip: CP2102N. Not detected? Hold BOOT while plugging in.
2
Flash with your tool
Arduino IDE, PlatformIO, ESPHome or esptool - copy the settings on the right.
3
Verify it runs
The blink example uses GPIO0 - swap for your board's LED pin if different.
Board: Esp32 C3 Devkitc 02
Flash Size: 4MB · DIO
Upload Speed: 921600
// blink
pinMode(0, OUTPUT);
digitalWrite(0, LOW); // on (often inverted)[env:esp32-c3-devkitc-02]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32-c3-devkitm-1
variant: esp32_c3_devkitc_02
framework:
type: esp-idf
# blink - GPIO0
output:
- platform: gpio
pin: 0
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesptool.py --chip esp32c3 --port /dev/ttyACM0 \
write_flash 0x0 firmware.binBuild details: sketch space 1310720 B · data 327680 B · DIO
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
1.25 MB · 320 KB
38.91 × 25.4 mm · pin pitch 2.54 mm
The Espressif ESP32-C3-DevKitC-02 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-C3 - a single-core RISC-V and the budget low-power pick.
Expect to pay about $8.00 - less than the ~$10 most ESP32-C3 boards go for.
Onboard you'll find 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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