Bluetooth Modem - BlueSMiRF Silver (Sparkfun WRL-12577)

Bluetooth Modem - BlueSMiRF Silver (Sparkfun WRL-12577)

Reference: WRL-12577 RN42

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Bluetooth Modem - BlueSMiRF Silver (Sparkfun WRL-12577)

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Bluetooth Modem - BlueSMiRF Silver (Sparkfun WRL-12577)

The BlueSMiRF Silver is the latest Bluetoothwireless serial cable replacement 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 used in the BlueSMiRF Gold. These modems work as a serial (RX/TX) pipe. Any serial stream from 2400 to 115200bps can be passed seamlessly from your computer to your target.

The 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 notattach this device directly to a serial port. You will need anRS232 to TTL converter circuit if you need to attach this to a computer.

Unit comes without a connector. Please see related male and female pins below.


  • FCC Approved Class 2 Bluetooth Radio Modem
  • Extremely small radio - 0.15x0.6x1.9"
  • Very 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: 2.4~2.524 GHz
  • Operating Voltage: 3.3V-6V
  • Serial communications: 2400-115200bps
  • Operating Temperature: -40 ~ +70C
  • Built-in antenna

Dimensions: 45x16.6x3.9mm


This is a single unit only. We recommend the purchase a USB dongle to interface to a computer if you do not already have access to a computer with Bluetooth connectivity.

WRL-12577 RN42

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