Datasheet

Bluefruit UART Friend V2

Bluefruit LE UART Friend

BLESPIFRIEND Firmware (SPI)

Bluefruit LE SPI Friend

Bluefruit LE Shield

Bluefruit LE Micro

Feather 32u4 Bluefruit LE

Feather M0 Bluefruit LE

3. Flash a Test Sketch

Once the core Bluefruit firmware has been updated, flash a test sketch to the device from

the Arduino IDE, such as the following blinky code:

4. Perform a Factory Reset

Once the core Bluefruit firmware has been updated, the final step is to perform a factory

reset.

With the board still powered up, connect the DFU pin to GND

Leave the pin set to GND (or hold the DFU button down) for >5 seconds until the BLUE

status LED starts to blink

Remove the DFU jumper cable or release the DFU button

// the setup function runs once when you press reset or power the board

void setup() {

// initialize digital pin LED_BUILTIN as an output.

pinMode(LED_BUILTIN, OUTPUT);

}

// the loop function runs over and over again forever

void loop() {

digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)

delay(1000); // wait for a second

digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW

delay(1000); // wait for a second

}