Adafruit Bluefruit LE UART Friend - Bluetooth® Low Energy
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Bluetooth Low Energy module breakout with a UART (AT-command) interface for adding BLE connectivity to any microcontroller with a serial port.
Bluetooth Low Energy module breakout with a UART (AT-command) interface for adding BLE connectivity to any microcontroller with a serial port.
Power supply input, regulated down to 3.3V
Common ground for power and logic
UART transmit out of Bluefruit LE to MCU
UART receive into Bluefruit LE from MCU, level shifted
Clear To Send flow control into breakout, pulled high and must be grounded to enable TXO if unused
Ready To Send flow control out of module
Mode selection pin used to switch command/UART data mode
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | main header | Power | Power supply input, regulated down to 3.3V | 3.3-16V input |
| GND | main header | Ground | Common ground for power and logic | 0V |
| TXO | main header | Unknown | UART transmit out of Bluefruit LE to MCU | 3.3V logic |
| RXI | main header | Unknown | UART receive into Bluefruit LE from MCU, level shifted | 3-5V logic accepted |
| CTS | main header | UART | Clear To Send flow control into breakout, pulled high and must be grounded to enable TXO if unused | 3-5V logic |
| RTS | main header | UART | Ready To Send flow control out of module | 3.3V output |
| MOD | main header | Control | Mode selection pin used to switch command/UART data mode | logic level |
Power supply input, regulated down to 3.3V
Common ground for power and logic
UART transmit out of Bluefruit LE to MCU
UART receive into Bluefruit LE from MCU, level shifted
Clear To Send flow control into breakout, pulled high and must be grounded to enable TXO if unused
Ready To Send flow control out of module
Mode selection pin used to switch command/UART data mode
UART · SPI · 3.3 V · 5 V · Breakout
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