DFRobot Beetle ESP32-C3
Ultra-small ESP32-C3 board with Type-C and rich GPIO - great for wearable, embedded, and space-limited designs.
Pinout
13 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 0 | A0 | safe | adc | |
| 2 | 1 | A1 | safe | adc | |
| 3 | 2 | A2 | strapping | adc | |
| 4 | 3 | A3 | safe | adc | |
| 5 | 4 | SCKA4 | strapping | adc · spi | |
| 6 | 5 | MISOA5 | strapping | adc · spi | |
| 7 | 6 | MOSI | strapping | spi | |
| 8 | 7 | SS | strapping | spi | |
| 9 | 8 | SDA | strapping | i2c | |
| 10 | 9 | SCL | strapping | i2c | |
| 11 | 10 | LED_BUILTIN | safe | - | |
| 12 | 20 | RX | uart | uart | |
| 13 | 21 | TX | uart | uart |
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
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| A2 | GPIO2 | Must be held high during boot (if low on reset, normal flash boot may fail) | Strapping |
| SCK | MTMS | Used during boot; JTAG TMS for debugging; acts as Quad-SPI flash IO (hold data line) in internal-flash variants | JTAG |
| MISO | MTDI | Used during boot; JTAG TDI for debugging; acts as Quad-SPI flash IO (write-protect data line) in internal-flash variants | JTAG |
| MOSI | MTCK | Used during boot; JTAG TCK for debugging; provides flash clock in internal-flash variants | JTAG |
| SS | MTDO | Used during boot; JTAG TDO for debugging; acts as Quad-SPI flash IO (data line) in internal-flash variants | JTAG |
| SDA | GPIO8 | Must be held high during reset (if low, UART flashing/boot may not work) | Strapping |
| SCL | GPIO9 | Controls boot mode on reset (HIGH for normal flash boot, LOW enters serial download mode) | Strapping |
| RX | U0RXD | Used as UART0 receive (console/bootloader); repurposing may disable serial programming and debug logs | UART |
| TX | U0TXD | Used as UART0 transmit (console/bootloader); repurposing may disable serial console output and printing | UART |
Pinout notes The DFRobot Beetle ESP32-C3 pinout brings out 13 GPIO pins at a 2.54 mm pitch - every one of them usable in your project. For peripherals, I²C is mapped to SDA…
The DFRobot Beetle ESP32-C3 pinout brings out 13 GPIO pins at a 2.54 mm pitch - every one of them usable in your project.
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.
If you want zero surprises, A0, A1, A3 and LED_BUILTIN 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 (A2, SCK, MISO and 6 more).
Getting started
flash your first firmware in ~2 minutesBoard: Esp32c3 Dev
USB CDC On Boot: Enabled
Flash Size: 4MB · QIO
Upload Speed: 921600
// blink
pinMode(0, OUTPUT);
digitalWrite(0, LOW); // on (often inverted)[env:dfrobot_beetle_esp32c3]
platform = espressif32
board = esp32-c3-devkitm-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600esp32:
board: esp32-c3-devkitm-1
variant: dfrobot_beetle_esp32c3
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.binSpecifications
ESP32-C3 · 25 × 20.5 mmAbout this board
At its core is the ESP32-C3 - a single-core RISC-V and the budget low-power pick.
Expect to pay about $17.00 - above the ~$10 typical for ESP32-C3 boards.
Onboard you'll find battery charging (TP4057) and Reset/Boot buttons.
It flashes over native USB - no serial-converter driver needed, which isn't a given among ESP32-C3 boards.
Where to buy
prices are typical street pricesResources
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