Adafruit Bluefruit LE UART Friend - Bluetooth® Low Energy
Bluetooth Low Energy module breakout with a UART (AT-command) interface for adding BLE connectivity to any microcontroller with a serial port.
Pinout
- VINmain header
Power supply input, regulated down to 3.3V
Type · PowerVoltage · 3.3-16V input - GNDmain header
Common ground for power and logic
Type · GroundVoltage · 0V - TXOmain header
UART transmit out of Bluefruit LE to MCU
Type · UnknownVoltage · 3.3V logic - RXImain header
UART receive into Bluefruit LE from MCU, level shifted
Type · UnknownVoltage · 3-5V logic accepted - CTSmain header
Clear To Send flow control into breakout, pulled high and must be grounded to enable TXO if unused
Type · UARTVoltage · 3-5V logic - RTSmain header
Ready To Send flow control out of module
Type · UARTVoltage · 3.3V output - MODmain header
Mode selection pin used to switch command/UART data mode
Type · ControlVoltage · logic level
| 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 |
Pin details
7 connections- VINmain header
Power supply input, regulated down to 3.3V
PowerVoltage · 3.3-16V input - GNDmain header
Common ground for power and logic
GroundVoltage · 0V - TXOmain header
UART transmit out of Bluefruit LE to MCU
UnknownVoltage · 3.3V logic - RXImain header
UART receive into Bluefruit LE from MCU, level shifted
UnknownVoltage · 3-5V logic accepted - CTSmain header
Clear To Send flow control into breakout, pulled high and must be grounded to enable TXO if unused
UARTVoltage · 3-5V logic - RTSmain header
Ready To Send flow control out of module
UARTVoltage · 3.3V output - MODmain header
Mode selection pin used to switch command/UART data mode
ControlVoltage · logic level
Start wiring
UART · SPI · 3.3 V · 5 V · Breakout
Seeed describes MDBT50Q-1M and MDBT50Q-P1M as Bluetooth 5.0 / BLE modules based on Nordic nRF52840, with GPIO, SPI, UART, I2C, I2S, PWM, …
Module pins: VIN, GND. Schematik maps them to your board in the app.
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