DFRobot Firebeetle 2 ESP32-S3
An ESP32-S3 board with an onboard camera interface and independent power supply circuit, designed for image recognition applications.
DFRobot Firebeetle 2 ESP32-S3 Pinout
25 pins · 2.54 mm pitch| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | 0 | D9 | strapping | - | |
| 2 | 1 | SDAT1PWM | safe | touch · i2c | |
| 3 | 2 | SCLT2PWM | safe | touch · i2c | |
| 4 | 3 | D2T3GDI_DCPWM | strapping | touch | |
| 5 | 4 | A0T4PWM | safe | adc · touch | |
| 6 | 5 | A1T5PWM | safe | adc · touch | |
| 7 | 6 | A2T6PWM | safe | adc · touch | |
| 8 | 7 | D5T7GDI_FCSPWM | safe | touch | |
| 9 | 8 | A3T8PWM | safe | adc · touch | |
| 10 | 9 | D7T9GDI_SDCSPWM | strapping | touch | |
| 11 | 10 | SSA4T10PWM | strapping | adc · touch · spi | |
| 12 | 11 | A5T11PWM | strapping | adc · touch | |
| 13 | 12 | D12T12GDI_TCSPWM | strapping | touch | |
| 14 | 13 | D11T13GDI_INTPWM | strapping | touch | |
| 15 | 14 | D10T14GDI_BUSY_TEPWM | strapping | touch | |
| 16 | 15 | MOSIPWM | safe | spi | |
| 17 | 16 | MISOPWM | safe | spi | |
| 18 | 17 | SCKPWM | safe | spi | |
| 19 | 18 | D6GDI_CSPWM | safe | - | |
| 20 | 21 | D13GDI_BLKPWM | safe | - | |
| 21 | 38 | D3GDI_RESPWM | safe | - | |
| 22 | 43 | TXPWM | uart | uart | |
| 23 | 44 | RXPWM | uart | uart | |
| 24 | 47 | D14 | strapping | - | |
| 25 | - | LED_BUILTIN | safe | - |
Start with these
13 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
11 pins · 6 things to knowD9GPIO0 Bootstrapping pin (Chip boot mode selection) Strapping
Must be pulled high (default) or low (to enter UART download mode) at reset. Using it for other functions can interfere with boot mode configuration.
D2GPIO3 Bootstrapping pin (controls JTAG signal source) Strapping
Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface.
D7GPIO9SSGPIO10A5GPIO11D12GPIO12D11GPIO13D10GPIO14 General-purpose SPI2 (FSPI) IO MUX pins Other
IO MUX pin of the general-purpose SPI2 (FSPI) bus, not of the in-package flash - that sits on GPIO26-32. The datasheet lists it as a priority-2 pin ("can be freely used without restrictions"), so it is only taken if your board wires flash, an SD card or a display to FSPI.
- D7General-purpose SPI2 (FSPI) IO MUX pin - hold/data line (FSPIHD)
- SSGeneral-purpose SPI2 (FSPI) IO MUX pin - chip select (FSPICS0)
- A5General-purpose SPI2 (FSPI) IO MUX pin - data in (FSPID)
- D12General-purpose SPI2 (FSPI) IO MUX pin - clock (FSPICLK)
- D11General-purpose SPI2 (FSPI) IO MUX pin - data out (FSPIQ)
- D10General-purpose SPI2 (FSPI) IO MUX pin - write-protect/data line (FSPIWP)
TXGPIO43 UART0 transmit pin (U0TXD), default serial console TX UART
Used for bootloader output and UART console logs. If repurposed, you will lose the default serial output (and programming via UART0).
RXGPIO44 UART0 receive pin (U0RXD), default serial console RX UART
Used for bootloader input (download mode via serial). If repurposed, you cannot use the default UART0 download mode for programming the chip.
D14GPIO47 Octal SPI differential clock positive leg (SPICLK_P_DIFF), used only by the 1.8 V octal flash/PSRAM variants Other
Only the 1.8 V octal parts (ESP32-S3R8V, ESP32-S3R16V) run the differential memory clock here, and on those the pin works at 1.8 V instead of 3.3 V. On the common 3.3 V modules it is a normal GPIO - several devkits drive their RGB LED from GPIO48.
The DFRobot Firebeetle 2 ESP32-S3 pinout brings out 25 pins at a 2.54 mm pitch - 24 usable GPIO.
For peripherals, I²C is mapped to SDA on GPIO1 and SCL on GPIO2; the SPI bus (MOSI, MISO, SCK, SS) is broken out in full; TX/RX on GPIO43 and GPIO44 cover serial logging and flashing.
On the analog side there are 6 ADC-capable pins for sensors and battery monitoring and 14 capacitive-touch inputs.
If you want zero surprises, SDA, SCL, A0, A1 and 9 more are free of any such role - the safest first picks. 11 of the exposed pins carry boot-time or system duties on the ESP32-S3 (D9, D2, D7 and 8 more).
Getting started
flash your first firmware in ~2 minutesBoard: ESP32S3 Dev Module USB CDC On Boot: Enabled Flash Size: 16MB (128Mb) Flash Mode: DIO PSRAM: OPI PSRAM Partition Scheme: 16M Flash (3MB APP/9.9MB FATFS) Upload Speed: 921600
// toggle GPIO1 - wire an LED and resistor to it
void setup() {
pinMode(1, OUTPUT);
}
void loop() {
digitalWrite(1, HIGH); delay(500);
digitalWrite(1, LOW); delay(500);
}[env:dfrobot_firebeetle2_esp32s3]
platform = espressif32
board = esp32-s3-devkitc-1
framework = arduino
monitor_speed = 115200
upload_speed = 921600
board_build.arduino.memory_type = qio_opi
build_flags = -DBOARD_HAS_PSRAMesp32-s3-devkitc-1 - or type it after board =.esp32:
board: esp32-s3-devkitc-1
variant: esp32s3
framework:
type: esp-idf
psram:
mode: octal
speed: 80MHz
# blink - GPIO1
output:
- platform: gpio
pin: 1
id: led_out
light:
- platform: binary
name: "LED"
output: led_outesp32-s3-devkitc-1 (same ids as PlatformIO).esptool.py --chip esp32s3 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Specifications
ESP32-S3 · 60 × 25.4 mm · vs other ESP32 chips →Dimensions
About this board
At its core is the ESP32-S3 - a dual-core Xtensa with vector extensions suited to AI workloads.
Expect to pay about $19.90 - less than the ~$29 most ESP32-S3 boards go for.
Onboard you'll find 8MB (OPI) PSRAM, battery charging (ETA6003) and Reset/Boot buttons.
It flashes over native USB - no serial-converter driver needed, which isn't a given among ESP32-S3 boards.
- OV2640 (2MP, 1600x1200) camera interface via an onboard DVP connector with independent power supply
- 16MB flash and 8MB octal PSRAM (ESP32-S3-WROOM-1-N16R8 module)
- Independent RF, camera and system power circuits to reduce interference for low-noise, low-power use
- GDI display interface connector for compatible screens
- ETA6003 Li-ion charger (up to 1A) with on/off power control
- AI acceleration for speech and image recognition
- DFR0975-U variant adds an external IPEX/u.FL antenna (ESP32-S3-WROOM-1U-N16R8)
Where to buy
prices are typical street pricesResources
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