View source for Freerunner RFID Board

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Return to Freerunner RFID Board.

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Freerunner RFID Board

NOTE: This is work in progress and quite incomplete


The FRIDB realizes an experimental platform for RFID (13.56 MHz). It consists of an Antenna, a ST Micro M24LR64 RFID-Tag Chip with EEPROM port and a Texas Instruments TRF7960 RFID reader chip with SPI interface.

So you can make the Freerunner either a RFID tag (e.g. to open doors) or a RFID reader (to read/write standard tags e.g. in credit card format).

The board comes with three parts that can/must be separated:

  • Antenna
  • RFID-Tag with I2C EEPROM (ST Micro M24LR64)
  • RFID-Reader with SPI interface (TI TRF7960)

Either the Tag or the Reader module fits into the area above the SIM/SD card reader of the Openmoko Freerunner. It is up to you to wire the board to the Freerunner main board in a way that you can still swap SD cards and/or SIM cards.

The FRIDB can also connected to other Microcontrollers and SoC (e.g BeagleBoard) since it has splitted I/O and power supply.

Expansion pads

The supply voltage as well as the SPI / I2C bus is routed to testpads at the end of the board.


The project home is There, you can find background information, instructions, software etc.

Schematic and board layout files are available in CadSoft EAGLE 5.x format from


Pinout: Bottom side, Top side
I2C testpoints
  • VCC: +3.3V, available at the AUX-Switch
  • VIO: +1.8 V - +3.3V, available at the AUX-Switch
  • GND: Ground, available from the (big) decoupling capacitor next to the accelerometer
  • SCL, SDA: Serial clock and data, get it from testpoints at the debug connector
  • OE: Output enable from the frequency generator. Pull this pin high to enable the CLK output
  • CLK: Clock output from the frequency generator.
  • LED controller 0-3: LED current sinks. Connect LEDs in series with current limiting resistors from VCC to these pads.
  • 12-Bit A/D 0-3: Analog to digital converter inputs. They can operate single ended or differencial. The reference voltage is VCC.
  • Touch electrodes 0-6: Connect these pads to a larger conducting area to use it as touch sensor. The inputs 0-3 can also be used to drive LEDs. Refer to the datasheet for more information.
Top side with the M24LR64 and the TRF7960


Hardware installation

The best way to connect the FRIDB to your Freerunner is to solder four wires to...

Here is a PDF with an overview of the Installation.

Software installation


Known HW or SW Issues


Kernel drivers



Userspace software

n/a yet. Volunteers welcome!


The team kindly offered to retail the FRIDB. You can find it here.

User Reports

Please write to the discussion page.