Datasheet

Wiring

You can use the Bluefruit LE UART friend with any microcontroller with 3 or 5V logic, but we'll be demoing it with an Arduino UNO. Depending on

whether your microcontroller has a hardware or software UART, adjust pins as necessary!

Wiring for Arduino Uno

To connect the Bluefruit LE UART Friend to your Arduino Uno using the default pinout in our sample sketches, connect the pins up as follows:

MOD to Pin 12

CTS to Pin 11

TXO to Pin 10

RXI to Pin 9

VIN to 5V

RTS to Pin 8

GND to GND

The wiring diagram below shows how this might look on your system:

All of these pins are 'flexible' and you can change them around as necesary after you get your setup running nicely, but we recommend starting

out with our default wiring.

Wiring for an Arduino Micro or Leonardo

To connect the Bluefruit LE UART Friend to an Arduino Micro or Leonardo, use the following pinout and make sure you've selected HW UART as

the constructor in your sample sketches (they default to SW Serial):

1/TX to RXI

0/RX to TXO

+5V on the Micro/Leonardo to VIN

GND to GND

Connect CTS on the Bluefruit LE Module to GND

The HW Serial constructor can be seen below, and should be uncommented in the sample sketches:

/* ...or hardware serial, which does not need the RTS/CTS pins. Uncomment this line */

Adafruit_BluefruitLE_UART ble(BLUEFRUIT_HWSERIAL_NAME, BLUEFRUIT_UART_MODE_PIN);

Wiring for an FTDI Cable

https://learn.adafruit.com/introducing-the-adafruit-bluefruit-le-uart-

friend

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