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Bluetooth to Serial Module, Class 2, RN-42, BlueSMiRF Silver US$39.95

WRL-12577
Bluetooth to Serial Module, Class 2, RN-42, BlueSMiRF Silver


The BlueSMiRF Silver works as a serial (RX/TX) pipe. These boards are a great wireless replacement for serial cables. Any serial stream from 1200 to 921600 bps can be passed seamlessly from your computer to your target.

This version of the BlueSMiRF uses the RN-42 Bluetooth modem. These modems come configured to use 115200 baud by default. Being Class 2 Bluetooth, they have a much shorter range (60 feet max), but also consume less power than Class 1 devices. As serial cable replacement, the range is still plenty, so the power saving and lower price is ideal.

If you do need the longer range of Bluetooth Class 1, see the BlueSMiRF Gold.

This BlueSMiRF Silver remote unit can be powered from 3.3V up to 6V for easy battery attachment. All signal pins on the remote unit are 3V-6V tolerant. No level shifting is required. Do not attach this device directly to a serial port; you will need an RS232-to-TTL converter circuit if you want to attach this to a computer's DB9 RS232 port.

The unit comes without a connector. You can solder straight headers onto the through-hole pads. We also have right-angle headers available in packs.

The hardware reset pin of the RN-42 module (PIO4) is broken out on the bottom side of the board. Should you need to reset the BlueSMiRF, pull this pin High upon power-up, then toggle it three times.

RN-42 Bluetooth Module Board Features

  • FCC Approved Class 2 Bluetooth Radio Modem
  • Firmware version 6.15
  • Low power consumption: 25mA average
  • Robust link both in integrity and transmission distance (18m)
  • Hardy frequency-hopping scheme operates in harsh RF environments like WiFi, 802.11g, and Zigbee
  • Encrypted connection
  • Frequency: 2.4 to 2.524 GHz
  • Operating Voltage: 3.3V to 6V
  • Serial communications: 1200 to 921600 bps
  • Operating Temperature: -40 to +70 degrees C
  • Built-in antenna
  • Dimensions: 45 16.6 3.9 mm

Board pinout

The six pins on the board are in the following order: CTS-I, VCC, GND, TX-O, RX-I, RTS-O. There is another version of this board with a different pinout for compatibility with Arduino Pro and LilyPad boards: Bluetooth Mate Silver.

RN-42 Bluetooth Module Board Resources

Remember to order two of these boards unless one of your devices already has a Bluetooth modem!


This product was added to our catalog on Wednesday 08 May, 2013.

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