Saturday, August 30, 2014


Bluetooth are quite popular nowadays. Bluetooth are low powered and are now equipped in every smart phone. Bluetooth is mostly used for wireless audio streaming in music players and headphones and earphones. Bluetooth gives many profiles or services.
One popular service is SPP Serial Port Profile. This serial port profile is mostly used with the microcontrollers and configuring the bluetooth module wirelessly..
Microchip's RN42 device is very low powered about 42uA chip in sleep mode. This gives the serial port profile. Off the box this devices is configured as the 115200 baud rate serial salve device with pairing code of 1234.

  • Fully qualified Bluetooth module
  • FCC Certified
  • Fully configurable UART
  • UART Data rates up to 3Mbps
  • Over air data rate of 721kbps to 2.0Mbps
  • Low power sleep mode
  • Compatible with all Bluetooth products that support SPP
  • Includes support for BCSP, DUN, LAN, GAP SDP, RFCOMM, and L2CAP protocols
  • 3.3V operation
  • Status pin
  • Bluetooth Technology v2.0 compatible
  • Class 2 power output
It will works as a wireless serial pipe.
The RN42 module is quite small in sized 13.4 mm x
25.8 mm x 2 mm.
Here's the interfacing RN42 with devices.

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