FireBeetle 2 ESP32-UE (N16R2) IoT Board (16MB / 2MB PS, Ext Antenna)

ESP32 IoT board with 16 MB flash, 2 MB PSRAM, external antenna support via U.FL connector, dual power modes, and multiple programming options. The -UE suffix indicates external antenna output; use instead of the standard variant where RF range is a constraint.

Logical pinout · physical placement not verified

USB InterfaceOfficial table 6 row 1
Program download and power supply, 4.75V-5.5V compatible
Type · Power
Charging IndicatorOfficial table 6 row 2
Red LED for indicating charging status: 1. Off when fully charged or not charged; 2. On when charging; 3. Quick flash when powered by USB, and no battery connected.
Type · Unknown
User ButtonOfficial table 6 row 3
Controlled by pin IO27/D4
Type · GPIO
Li-ion Battery PortOfficial table 6 row 4
Support 3.5V-4.2V
Type · Power
Onboard RGB LightOfficial table 6 row 5
WS2812 RGB LED, controlled by pin IO5/D8
Type · GPIO
Onboard LEDOfficial table 6 row 6
LED controlled by pin IO2/D9
Type · GPIO
Reset ButtonOfficial table 6 row 7
Press to reset program
Type · GPIO
Low-power Solder Jumper PadOfficial table 6 row 8
Designed for low power mode and default to be connected. Slightly cut off the thin wire with a knife to disconnect it. When disconnected, static power consumption can be reduced by 500 μA. The power consumption can be reduced to 13 μA after controlling the maincontroller to enter the sleep mode through the program. Note: when the pad is disconnected, you can only drive RGB LED light via the USB Power supply.
Type · Analog
GDIOfficial table 6 row 9
DFRobot dedicated Display interface. Refer to the GDI part of this page.
Type · GPIO
⑩Official table 6 row 10
ESP32-UE Module / ESP32-WROOM-32UE-N16R2
Type · Unknown

Pin	Position	Type	Function
USB Interface	Official table 6 row 1	Power	Program download and power supply, 4.75V-5.5V compatible
Charging Indicator	Official table 6 row 2	Unknown	Red LED for indicating charging status: 1. Off when fully charged or not charged; 2. On when charging; 3. Quick flash when powered by USB, and no battery connected.
User Button	Official table 6 row 3	GPIO	Controlled by pin IO27/D4
Li-ion Battery Port	Official table 6 row 4	Power	Support 3.5V-4.2V
Onboard RGB Light	Official table 6 row 5	GPIO	WS2812 RGB LED, controlled by pin IO5/D8
Onboard LED	Official table 6 row 6	GPIO	LED controlled by pin IO2/D9
Reset Button	Official table 6 row 7	GPIO	Press to reset program
Low-power Solder Jumper Pad	Official table 6 row 8	Analog	Designed for low power mode and default to be connected. Slightly cut off the thin wire with a knife to disconnect it. When disconnected, static power consumption can be reduced by 500 μA. The power consumption can be reduced to 13 μA after controlling the maincontroller to enter the sleep mode through the program. Note: when the pad is disconnected, you can only drive RGB LED light via the USB Power supply.
GDI	Official table 6 row 9	GPIO	DFRobot dedicated Display interface. Refer to the GDI part of this page.
⑩	Official table 6 row 10	Unknown	ESP32-UE Module / ESP32-WROOM-32UE-N16R2

Logical pinout · physical placement not verified

Pin details

10 connections

USB Interface
Program download and power supply, 4.75V-5.5V compatible
Power
Official table 6 row 1
Charging Indicator
Red LED for indicating charging status: 1. Off when fully charged or not charged; 2. On when charging; 3. Quick flash when powered by USB, and no battery connected.
Unknown
Official table 6 row 2
User Button
Controlled by pin IO27/D4
GPIO
Official table 6 row 3
Li-ion Battery Port
Support 3.5V-4.2V
Power
Official table 6 row 4
Onboard RGB Light
WS2812 RGB LED, controlled by pin IO5/D8
GPIO
Official table 6 row 5
Onboard LED
LED controlled by pin IO2/D9
GPIO
Official table 6 row 6
Reset Button
Press to reset program
GPIO
Official table 6 row 7
Low-power Solder Jumper Pad
Designed for low power mode and default to be connected. Slightly cut off the thin wire with a knife to disconnect it. When disconnected, static power consumption can be reduced by 500 μA. The power consumption can be reduced to 13 μA after controlling the maincontroller to enter the sleep mode through the program. Note: when the pad is disconnected, you can only drive RGB LED light via the USB Power supply.
Analog
Official table 6 row 8
GDI
DFRobot dedicated Display interface. Refer to the GDI part of this page.
GPIO
Official table 6 row 9
⑩
ESP32-UE Module / ESP32-WROOM-32UE-N16R2
Unknown
Official table 6 row 10

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