Multi-Sensor Data Acquisition Unit (MSDAU)

The Multi-Sensor Data Acquisition Unit (MSDAU) hardware consists of a waterproof enclosure containing a Raspberry Pi computer and a collection of sensors on a second board mounted on top of the Pi.  The sensor board and its specifications are described below.  Power over Ethernet (PoE) and bi-directional communications are provided via an external waterproof RJ45 connector.   Two other waterproof connectors provide for two external USB interfaces.  An SMA RF antenna connector provides signal for the internal Software-Defined Radio (RDR) that generates RF spectrum data.

The MSDAU is housed in a plastic enclosure, sealed when closed to IP66 and NEMA 1, 2, 4 and 4x specifications.

  • External size: 8.27in (210mm) long by 6. in (160mm) wide by 3.94in (100mm) deep
  • Gore vent for internal/external pressure equalization without condensation
  • Waterproof connectors for Ethernet, USB (2) and SMA for RF antenna
  • Pi Sense Hat with 15 sensors, 8x8 multi-color display and joystick
  • Internal GPS receiver with SiRF Star IV GPS Chipset
  • Optional internal SDR receiver with frequency range of 25MHz to 1750MHz or 1MHz to 6000MHz
  • Clear cover for display and indicator visibility while sealed
  • Power: <4W
  • Temperature range: 0 to 50 degrees C internal; external could be lower

The Sense HAT has an 8×8 RGB LED matrix, a five-button joystick and includes the following sensors:

  • Gyroscope - angular rate sensor: +/-245/500/2000dps
  • Accelerometer - Linear acceleration sensor: +/-2/4/8/16 g
  • Magnetometer - Magnetic Sensor: +/- 4/8/12/16 Gauss
  • Barometer: 260 - 1260 hPa absolute range (accuracy depends on the temperature and pressure, +/- 0.1 hPa under normal conditions)
  • Temperature sensor (Temperature accurate to +/- 2 degrees C in the 0-65 degrees C range)
  • Relative Humidity sensor (accurate to +/- 4.5% in the 20-80%rH range, accurate to +/- 0.5 degrees C in 15-40 degrees C range)
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