BlueSMiRF Silver - Bluetooth Modem

Pololu item #: 2725
Brand: SparkFun
Status: Discontinued by Manufacturer 
RoHS 3 status: supplier unspecified

This product has been discontinued.

The BlueSMiRF is an easy-to-use Bluetooth serial link that works over a range of logic voltages from 3.3 V to 6 V. It has a transmission distance of up to 18 meters. The board carries the RN-42 Class 2 Bluetooth module from Roving Networks, which is a robust, FCC-approved Bluetooth module. A single 0.1″ header for all the pins makes it easy to use with standard solderless breadboards and 0.1″ perfboards.

 Description Specs (3) Pictures (4) Resources (3) FAQs (0) On the blog (0) 


The BlueSMiRF Silver is a Bluetooth wireless serial link from SparkFun Electronics. This version of the popular BlueSMiRF uses the RN-42 module, which has a bit less range than the RN-41 module. These modems work as a serial (RX/TX) pipe. Any serial stream from 2400 bps to 115200 bps can be passed seamlessly from your computer to your target.

The modem can be powered from 3.3 V to 6 V for easy battery attachment. All signal pins are 3 V to 6 V tolerant. No level shifting is required.

For more information and resources to help you use the BlueSMiRF Silver, see the guide on SparkFun’s site. The RN-42 Bluetooth module datasheet and the Roving Networks Blueooth product user’s guide can be found under the Resources tab.

Warning: Do not attach this device directly to a serial port. You will need an RS232 to TTL converter circuit if you need to attach this to a computer.

This unit does not include any additional hardware or connectors. The 0.1″-spaced holes work well with our breakaway male header pins.


  • FCC approved Class 2 Bluetooth radio modem
  • Size: 0.15″ × 0.63″ × 1.65″
  • Operating voltage: 3.3 V to 6 V
  • Very robust link both in integrity and transmission distance (18 m)
  • Hardy frequency hopping scheme – operates in harsh RF environments like WiFi, 802.11g, and Zigbee
  • Encrypted connection
  • Frequency: 2.4 GHz to 2.524 GHz
  • Serial communications: 2400 bps to 115200 bps
  • Operating temperature: -40 °C to +70 °C
  • Built-in antenna
  • Firmware version 6.15

Note: SparkFun calls this product the “Bluetooth Modem – BlueSMiRF Silver” SKU: WRL-12577.

People often buy this product together with:

0.100" (2.54 mm) Breakaway Male Header: 1×40-Pin, Straight, Black 0.100" (2.54 mm) Breakaway Male Header: 1×40-Pin, Straight, Black
0.100" (2.54 mm) Breakaway Male Header: 1×40-Pin, Right Angle 0.100" (2.54 mm) Breakaway Male Header: 1×40-Pin, Right Angle
Rocker Switch: 3-Pin, SPDT, 10A Rocker Switch: 3-Pin, SPDT, 10A

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