Build Season 2026 is live: Publish a build to win M5Stack hardwareBuild Season 2026 is live

FireBeetle ESP32 IoT Microcontroller (DFR0478)

FireBeetle ESP32 IoT Microcontroller (DFR0478) — DFRobot — DFR0478

Low-power IoT board (29×58 mm) with ESP32 dual-core Tensilica LX6 at 240 MHz, 520 KB SRAM, 16 MB flash, 802.11b/g/n Wi-Fi, Bluetooth 4.2, and a deep-sleep current of 10 µA. Exposes 10 digital and 5 analog pins, I2C, SPI, UART, I2S, and a microSD slot; operates from 3.3–5 V.

Pinout

Logical pinout · physical placement not verified
FIREBEETLE ESP32 IOT MIO3RXDD0SDAIO1TXDD1SCLIO25D2BCLKIO26D3MCLKIO27D4DOIO9D5DIIO10D6LRCKIO13D7CLKIO5D8SD0IO2D9SD1IO36A0CMDIO39A1IO0IO34A2RSTIO35A3GNDIO15A43V3SCKVCCMOSIAREFMISONC
  • IO3RXDD0

    Arduino D0 / serial RX; connects to ESP32 IO3

    Type · GPIO, UART
  • IO1TXDD1

    Arduino D1 / serial TX; connects to ESP32 IO1

    Type · GPIO, UART
  • IO25D2

    GPIO digital I/O and PWM output; connects to ESP32 IO25

    Type · GPIO
  • IO26D3

    GPIO digital I/O and PWM output; connects to ESP32 IO26

    Type · GPIO
  • IO27D4

    GPIO digital I/O and PWM output; connects to ESP32 IO27

    Type · GPIO
  • IO9D5

    GPIO digital I/O and PWM output; connects to ESP32 IO9

    Type · GPIO
  • IO10D6

    GPIO digital I/O and PWM output; connects to ESP32 IO10

    Type · GPIO
  • IO13D7

    GPIO digital I/O and PWM output; connects to ESP32 IO13

    Type · GPIO
  • IO5D8

    GPIO digital I/O and PWM output; connects to ESP32 IO5

    Type · GPIO
  • IO2D9

    GPIO digital I/O and PWM output; connects to ESP32 IO2

    Type · GPIO
  • IO36A0

    Arduino A0 analogue input; connects to ESP32 IO36

    Type · GPIO, Analog
  • IO39A1

    Arduino A1 analogue input; connects to ESP32 IO39

    Type · GPIO, Analog
  • IO34A2

    Arduino A2 analogue input; connects to ESP32 IO34

    Type · GPIO, Analog
  • IO35A3

    Arduino A3 analogue input; connects to ESP32 IO35

    Type · GPIO, Analog
  • IO15A4

    Arduino A4 analogue input; connects to ESP32 IO15

    Type · GPIO, Analog
  • SCK

    SPI clock pin; connects to ESP32 IO18

    Type · SPI
  • MOSI

    SPI MOSI data wire; connects to ESP32 IO23

    Type · SPI
  • MISO

    SPI MISO data wire; connects to ESP32 IO19

    Type · SPI
  • SDA

    I2C data wire; connects to ESP32 IO21

    Type · I2C
  • SCL

    I2C clock pin; connects to ESP32 IO22

    Type · I2C
  • BCLK

    I2S clock pin; connects to ESP32 IO14

    Type · Unknown
  • MCLK

    I2S master clock pin; connects to ESP32 IO12

    Type · Unknown
  • DO

    I2S data output wire; connects to ESP32 IO4

    Type · Unknown
  • DI

    I2S data input wire; connects to ESP32 IO16

    Type · Unknown
  • LRCK

    I2S LRCK data wire; connects to ESP32 IO17

    Type · Unknown
  • CLK

    Clock pin to ESP32 IO6

    Type · Unknown
  • SD0

    SD0 port to ESP32 IO7

    Type · Unknown
  • SD1

    SD1 port to ESP32 IO8

    Type · Unknown
  • CMD

    CMD port to ESP32 IO11

    Type · Unknown
  • IO0

    Digital interface; connects to ESP32 IO0

    Type · GPIO
  • RST

    Low-level reset port

    Type · Control
  • GND

    Power line ground

    Type · Ground
  • 3V3

    3.3 V output; datasheet states it can provide up to 600 mA current out

    Type · PowerVoltage · 3.3V output, up to 600mA
  • VCC

    Vi/Vo rail; 5 V when powered by USB, 3.7 V when powered by lithium battery

    Type · PowerVoltage · 5V on USB or 3.7V on lithium battery
  • AREF

    Input voltage reference; connected to NC on this board

    Type · Analog
  • NC

    Not connected

    Type · Control

ESP32

158 other options

Wi-Fi and Bluetooth on a single chip, in every shape from Espressif DevKitC to Adafruit Feathers with STEMMA QT, DFRobot FireBeetles tuned for battery life, and Seeed XIAOs under a thumbnail.

View all 158

Related groups

4 groups

Arduino

About 75 boards across every Arduino generation: 5V Uno/Mega/GIGA, 3.3V MKR and Portenta, plus DFRduino and Bluno compatibles. Confirm the voltage rail before stacking any shield.

Boards · Arduino boards · 77 parts

Add-ons

About 270 add-ons across Pi HATs, Arduino shields, and FeatherWings. The same function — motor control, PoE, display — usually ships once per host connector family. Get the host board right first.

Boards · HATs, Shields & add-ons · 270 parts

Other MCUs

Specialists: Teensy for high-clock audio and USB, Adafruit SAMD boards running CircuitPython or the Arduino IDE, proper STM32 eval kits, and the micro:bit classroom ecosystem. Schematik builds target ESP32, Arduino Uno, and Pico; come here when you have a specific reason to.

Boards · Other MCU boards · 229 parts

Pi Pico

The Raspberry Pi MCU line — Pico, Pico 2, and third-party boards on the same silicon — plus a deep bench of Pico-pinout displays, loggers, and radio modules that do nothing without a Pico plugged in.

Boards · Pico & RP2040 boards · 43 parts