DFR0492 Datasheet

FireBeetle with BLE4.1 SKU DFR0492

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DFR0492 DFR0492 DFR0492 (pdf)
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FireBeetle with BLE4.1 SKU DFR0492


DFRobot FireBeetle series are low power consumption controllers designed for Internet of Things IoT development. This Bluetooth controller combines Bluetooth Low Energy with Arduino controller, offering functions similar to the former Bluno series but with lower power consumption. FireBeetle BLE is compatible with Bluno series BLE and performs much better. It equipped with more stable DIALOG Bluetooth chip, supporting maximum 4Kbyte/s transmission rate and low power consumption 25uA POWER DOWN . It can be directly applied to low power consumption application such as wearable and intelligent tools and so on. It also supports multiple Bluetooth cascade, KISS connection approach connection and compatible with Bluno series. Its connection can be realized by holding host BOOT and moving to the target peripheral device.
• Support Arduino IDE program
• Support BLE central and peripheral switch
• Support Bluetooth serial port data transmit
• Support Bluetooth peer to peer P2P wireless programming
• Support Bluetooth multiple device cascade maximum:4
• Support Arduino Bluetooth library support multiple Bluetooth connection
• Support low power consumption Bluetooth standby current 25uA enabled interrupt current 70uA
• Double interruption to wake up:

BLE4.1 awake Atmage328P by D2 high level awake Atmage328P awake BLE4.1 by D3 low level awake
• Support KISS connection approach connection
• Support Bluetooth firmware update
• Support USB charge
• Support lithium battery power supply
• Equipped with status LEDs

• Processor ATMEGA328P
• Bootloader Arduino Pro or Pro Mini, ATmega328 3.3V, 8MHz
• Operating Current 3.3V
• VCC I/O Voltage 3.7V~5.5V
• Lithium Battery Voltage 3.7V
• Support maximum 4Kbyte/s transmission rate more device, lower rate
• Support low power consumption 25uA POWER DOWN 70uA enabled interruption
• Support maximum discharge current 600mA LDO-3.3V OUTPUT
• Support maximum charge current 400Ma
• Digital Interfaces 14
• Analog Interfaces 6
• SPI 1
• I2C 1
• UART 1
• Interface Mode 2.54mm Pin/Female header , soldering free in default
• Dimension 58 * 29 mm/ * inches

Board Overview

Fig1 FireBeetle Board-328P with BLE4.1 PinOUT

LED indicators
• RX Serial data receiving indicator, light up when receive serial data
• TX Serial data transmitting indicator, light up when send serial data
• CHG Battery charge indicator Flash without lithium battery Light ON in charging Light OFF when
full charged
• LINK a Bluetooth connect indicator when Bluetooth connect to the device successfully, LINK will
light for 3s and blink for every 3s, light OFF when disconnected.

• BOOT Bluetooth firmware update enable KISS connection approach connection . Firmware update please press and hold BOOT button and power-up plug in USB , turning to the firmware update mode. For any enquiries, please refers to the part Firmware Update. Approach connection please hold the central BOOT button when it is in the working mode, approaching the peripheral Bluetooth device and connect.
• RST Arduino Reset button Note VCC is the output voltage of the power supply USB power supply 5V, lithium battery power supply 3.7V

Arduino Tutorial

Choose a suitable Arduino board

Considering low power consumption, we select Arduino Pro Mini 8MHz as Bootloader for FireBeetle BLE4.1 microcontrollers.

Fig2 FireBeetle Board-328P with BLE4.1 Special Note Pro Mini uses 8MHz OCXO. Its processing speed is relatively slow for 115200-baud rate. The high baud rate may lead to unreadable code and packet loss etc. 9600-baud rate is recommended.

Low Power Consumption Mode

BLE switch to low power consumption mode with AT command AT+LOWPOWER=ON. The Bluetooth can still broadcast and connect in the low power mode. When the Bluetooth received data, it will awake automatically and send an interrupt signal to the chip 328p. The interrupt pin here should be connected to D2 of 328p which is interrupt 0 in the code.
void sleep_disable delay 2000 ;

ADCSRA &= ~ 1<<ADEN ;/*turn off ADC*/ TWCR &= ~ 1<<TWEN ;/* turn off TWI*/ delay 10 sleep mode to power down mod e*/ sleep_enable ;/*enable sleep mode */ MCUCR |= 1<<BODS|1<<BODSE MCUCR = MCUCR & ~ 1<<BODSE | 1<<BODS sleep_cpu ;/*enter sleep mode */ void setup attachInterrupt 0, wakeup, CHANGE /* set interrupt method to trigger D2 to voltage change, callback func tion is wakeup , which means awake functions of the chip 328p*/ lowpower ;
void loop lowpower delay 2000 ;
• In the low-power mode, the whole power consumption of the FireBeetle Board-328P with BLE4.1 board is about 70uA.
• Turn off the interrupt and other peripherals, the whole power consumption of the FireBeetle Board-328P with BLE4.1 board is about 25uA.

AT Command

To get a ‘better’ Bluetooth experience on BLE modules, we highly recommand you to update the newest firmware first.

AT is the abbreviation of attention. AT command is the communication command used to configure Bluetooth parameters. It begins with AT, end with <CR+LF> carriage return and line feed .
• NOTE <CR+LF> is not a part of AT Command.

AT Command List

AT Command


Parameters <X>

“?” Query Bluetooth working mode

Set Bluetooth mode “ROLE_CENTRAL” Set as the central device “ROLE_PERIPHERAL” Set as the peripheral device


Set network mode
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Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived DFR0492 Datasheet file may be downloaded here without warranties.

Datasheet ID: DFR0492 508800