BlueSmiRF module

The BlueSmiRF module is a virtual serial port bluetooth device, produced by SparkFun.

Attaching this device to the RCX allows it to communicate using bluetooth. The BlueSmiRF contains Tx and Rx pins that convey the serial protocol data signals on TTL level. They could be connected to the RCX's motor and sensor ports, but the RCX also has a serial port, so to save the motor and sensor ports, it would be best to utilize the serial port for the communication purpose. However, this will require some work since the serial port of the RCX is connected to the IR tranciever device. It would require us to built a circuit that transforms the data received from the BlueSmiRF into IR signal transmitted further to the RCX IR serial port. At the same time the device should transform the IR signal emited by the RCX's serial port into a TTL level input further into the BlueSmiRF module, which transmits it further over the Bluetooth radio protocol.

Such a circuit is shown in the figure below. Found on robotika.sk

Specifications of the BlueSmiRF:

• v6.15 Firmware
• 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: 2.402~2.480 GHz
• Operating Voltage: 3.3V-6V
• Serial communications: 2400-115200bps
• Operating Temperature: -40 ~ +70C
• Built-in antenna

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