DFRobot FireBeetle 2 ESP32-E

Board
by DFRobotfirebeetle-2-esp32-e≈ cheap (under ~$15)
Verify my boardCompareEdit on GitHub
DFRobot FireBeetle 2 ESP32-E pinout
Pinout

Specifications

Radiosinherited from ESP32

Wi-Fi
Wi-Fi 4 · 2.4 GHz
Bluetooth LE
BLE 4.2
Bluetooth Classic
yes
802.15.4
no

USB

Native USB
no
Connector
usb-c

Board

Form factor
firebeetle
Dimensions
25.4 × 60 mm
Battery connector
yes
Charging
yes

Display & extras

Extras
rgb-ledsd-card
Built onDFRobot FireBeetle 2 ESP32-E BoardESP32 SoC

Low-power IoT main board on the ESP-WROOM-32E module: 4 MB flash, USB-C, onboard Li-ion charging via PH2.0 connector, WS2812 RGB LED, and a microSD slot.

Firmware for this board

No firmware recipes yet — help add one.

Notes

  • 4 MB flash
  • ESP32-WROOM-32E module, 520 KB SRAM
  • PH2.0 connector for 3.7 V Li-ion, onboard charging circuit
  • GDI display connector onboard
  • DFRobot sells a separate "FireBeetle 2 ESP32-E (N16R2)" SKU (DFR1139) specifically to add PSRAM, confirming this base DFR0654 board (whose own spec page never mentions PSRAM) uses the non-R2 ESP32-WROOM-32E ordering code with no PSRAM
  • io.gpio_free=12 DERIVED, not quoted (SPEC-io-power.md §5.3). The page's stated totals conflict ("up to 24 physical GPIOs" vs "Digital Pins x18"), so gpio_exposed is left unquoted; instead the board's own GPIO pin table is used directly. That table enumerates 20 exposed pads (quoted from the wiki GPIO table): GPIO 0,1,2,3,4,12,13,14,15,18,19,21,22,23,25,26,34,35,36,39. Subtracting esp32's soc.reserved_pins that are exposed -- strapping {0,2,12,15} exposed of {0,2,5,12,15} (4; GPIO5 is not broken out), input_only {34,35,36,39} (4, all exposed), and usb_flash_tied {6,7,8,9,10,11} (0 exposed) -- gives 20 - 4 - 4 - 0 = 12. Math not vendor-stated; verify before treating as exact.

Verify my board

Reads the connected chip over USB and checks it against what esp-atlas cites for DFRobot FireBeetle 2 ESP32-E — over Web Serial, no backend, nothing leaves your browser.

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Serial monitor

Not connected.