FireBeetle ESP32-E IoT Development Board(N16R8)

1. Getting Started

This guide provides a comprehensive overview of downloading and configuring the Arduino IDE for the FireBeetle 2 ESP32-E board, including essential steps for SDK installation and board selection, along with tutorials for basic and advanced Arduino applications.

Reference

This article explains how to manually install the CH340 driver for the FireBeetle 2 ESP32-E in case it is not automatically installed on Windows or MAC.

Specification

Power Parameters

Parameter	Details
Input Voltage	USB-C interface: 5V DC PH2.0 interface: 3.7V Li-ion VCC pin: 5V DC

MCU Parameters

Parameter	Details
Processor	Tensilica LX6 dual-core processor (one core for high-speed connectivity, one core for independent application development)
Clock Frequency	240MHz
SRAM	520KB
ROM	448KB
Flash	16MB
PSRAM	2MB
On-chip Clock	40MHz crystal oscillator, 32.768KHz crystal oscillator

Wireless Parameters

Parameter	Details
Wi-Fi Standard	FCC/CE/TELEC/KCC
Wi-Fi Protocol	802.11 b/g/n/d/e/i/k/r (802.11n, up to 150 Mbps), A-MPDU and A-MSDU aggregation, supports 0.4us protection interval
Wi-Fi Frequency Range	2.4~2.5 GHz
Bluetooth Protocol	Compliant with Bluetooth V4.2 BR/EDR and BLE standards
Bluetooth Audio	CVSD and SBC audio
Bluetooth Frequency Range	2.4~2.5GHz

Peripheral Parameters

Parameter	Details
Digital Pins	× 17: IO0, IO1, IO2, IO3, IO4, IO12, IO13, IO14, IO15, IO17, IO18, IO19, IO21, IO22, IO23, IO25, IO26
Analog Pins	× 11: IO0, IO2, IO4, IO12, IO13, IO14, IO15, IO25, IO26, I34, I35
UART Interfaces	×3
SPI Interface	×1
I2C Interface	×1
I2S Interface	×1
DAC Interface	×2
Touch Interfaces	×7
LED PWM Channels	×16
RGB_LED	WS2812
Display Interface	GDI

Other Parameters

Parameter	Details
Interface Compatibility	FireBeetle V2 series compatible
Module Size	25.4mm × 60mm
Weight	23.4g

DFR0997-Function description

No.	Function	Description
①	USB Interface	Program download and power supply, 4.75V-5.5V compatible
②	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.
③	User Button	Controlled by pin IO27/D4
④	Li-ion Battery Port	Support 3.5V-4.2V
⑤	Onboard RGB Light	WS2812 RGB LED, controlled by pin IO5/D8
⑥	Onboard LED	LED controlled by pin IO2/D9
⑦	Reset Button	Press to reset program
⑧	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.
⑨	GDI	DFRobot dedicated Display interface. Refer to the GDI part of this page.
⑩	ESP32-E Module	ESP32-WROOM-32E-N16R2

Pinout

DFR1139-Pinout

Categroy	Description
Control	FireBeetle enable/reset pins
Touch	Pin with capacitive touch function
Analog	Analog pin
Port PIN	Default physical pin number of the chip, which can be used to directly control the corresponding pin
Arduino IDE	In Arduino IDE, the pin numbers have been remapped by FireBeetle, and you can directly use this symbol to control the corresponding pin
RTC PIN	FireBeetle 2 ESP32-E supports low power function, and in Deep-sleep mode, only RTC pin keeps working and can be used as a wave-up source. When RTC pin is used as an output pin, it keeps outputting level value when the chip is in Deep-sleep mode, while as an input pin, it can wake up the chip from Deep-sleep.
GND	Common ground for all power supplies and logics
Power	When powered by 5V-USB, VCC outputs about 4.7V and 3V3 outputs 3.3V; When powered by 4V li-ion battery, VCC outputs about 4V and 3V3 outputs 3.3V(Actual measurement)

FireBeetle 2 ESP32-E(N16R2) has up to 21 physical GPIOs, which are mainly for connecting peripherals like sensors, actuators, etc. Meanwhile, these IO pins can be multiplexed for other functions such as UART, SPI, I2C and so on. The table below provides users with a detailed description of FireBeetle 2 ESP32-E(N16R2) GPIO.

Pin Number	Name	Function	ADC	Communication	Remark
GPIO 0	0/D5	Used as input or output	ADC2_CH1		Occupied when using USB transmission
GPIO 1	1/TXD	Used as input or output		UART0_TX	Occupied when using USB power supply and serial printing
GPIO 2	2/D9	Used as input or output	ADC2_CH2		For controlling onboard LED by outputting digital signal
GPIO 3	3/RXD	Used as input or output		UART0_RX	Occupied when using USB power supply and serial printing
GPIO 4	4/D12	Used as input or output	ADC2_CH0
GPIO 12	12/D13	Used as input or output	ADC2_CH5
GPIO 13	13/D7	Used as input or output	ADC2_CH4

Notice:

It is recommended not to multiplex the pin IO0/D5, IO1/TXD and IO3/RX since they will be occupied when using USB-related function. The USB-related circuit design is shown below:
IO34-39 are for input only.
NC Pin Explanation: Originally designated as IO16/D11 pin, it is now changed to NC pin, which means it should not be used for any other functions. Please refer to the datasheet for the reasons behind this change.
FireBeetle 2 ESP32-E(N16R2) has two 8-bit DAC channel that converts 2-way digital signal to 2 analog voltage outputs. Two channels can work independently. DAC circuit is composed of built-in resistors in series and a buffer. The two DACs can be used as reference voltage.