RN-XV and SD shield

The RN-XV and SD shield is designed for the Arduino. It provides an interface to the Roving Networks RN-XV Wifi module, which uses the pseudo-standard XBee footprint. XBee modules will probably work although the circuitry is designed for the UART interface and GPIOs of the RN-XV. The shield also provides an interface to an SD card and the MicroMag3 magnetometer module by PNI. The shield can operate at either 3.3V or 5V; logic-gate level shifters ensure that the inputs and outputs of the RN-XV and SD card are only exposed to 3.3V signals. For 5V operation the MicroMag module is powered at 5V.

The shield is fully functional on a standard Arduino (Duemilanove, Uno etc). Optional features such as flow control and the GPIO features of the RN-XV require an Arduino Mega(2560) or Calunium (https://github.com/stevemarple/Calunium). For more information see http://blog.stevemarple.co.uk/2011/12/rn-xvsd-shield.html.

Pin mapping

• D4: SD select (if jumper JP3 fitted in LH position)
• D5: RN-XV GPIO5 (if jumper JP5 fitted)
• D8: RN-XV GPIO6 (if jumper JP8 fitted)
• D9: RN-XV GPIO8 (if jumper JP6 fitted)
• D11: MOSI (if jumper JP7 fitted)
• D12: MISO (if jumper JP9 fitted)
• D13: SCK (if jumper JP10 fitted)
• D14 (Arduino Mega) or D22 (Calunium): RN-XV CTS (if jumper JP4 fitted)
• D15 (Arduino Mega) or D23 (Calunium): RN-XV RTS (if jumper JP12 fitted)
• A0: MicroMag SS
• A1: RN-XV GPIO4 (if jumper JP11 fitted)
• A2: LM61 temperature sensor
• A3: MicroMag reset, LM61 power and heartbeat LED
• A6: SD select (if jumper JP3 fitted in RH position)
• A8 (Arduino Mega) or D14 (Calunium): MicroMag DRDY

Jumper settings

• JP1: Shield power supply; voltage regulator or 3.3V supply
• JP2: Voltage regulator input; from +5V or Vin
• JP3: SD chip select; D4 or A6
• JP4: CTS flow control; D14 (Arduino Mega) or D22 (Calunium)
• JP5: GPIO5; D5
• JP6: GPIO8; D9
• JP7: MOSI; link MOSI to D11
• JP8: GPIO6; D8
• JP9: MISO; link MISO to D12
• JP10: SCK; link SCK to D13
• JP11: GPIO4; A1
• JP12: RTS flow control; D15 (Arduino Mega) or D23 (Calunium)
• X2: TX/RX selection, any of D0,D1,D2,D3. Also D19/D18 (RX1/TX1) for Arduino Mega or D2/D3 (RX1/TX1) for Calunium

Arduino library

An Arduino library to take advantage of the various features is provided.

See also

• Calunium: https://github.com/stevemarple/Calunium
• MicroMag Arduino library: https://github.com/stevemarple/MicroMag