TODO

   1 Easy:
   2 MAX7221 - SPI 8 digit LED
   3 - https://mbed.org/components/MAX7221/
   4 -
   5 SCA61T - inclinometer SPI
   6 - https://mbed.org/components/SCA61T-Inclinometer/
   7 DS1721 - i2c temperature/thermostat
   8 - https://mbed.org/components/DS1721/
   9 MPL3115A2 - i2c altimeter
  10 - https://mbed.org/components/MPL3115A2/
  11 - http://www.ebay.co.uk/itm/Barometric-Pressure-Altitude-Temperature-Sensor-I2C-MPL3115A2-/221499210102?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item339261b976
  12 TEMT6200 - Ambient light sensor
  13 - https://mbed.org/components/TEMT6200/
  14 CMPS03 - i2c digital compass
  15 - https://mbed.org/components/CMPS03-Digital-Compass/
  16 - http://www.ebay.co.uk/itm/Magnetic-Compass-CMPS03-/221437925374?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item338eba97fe
  17 - http://www.robot-italy.com/it/cmps03-robot-compass-module.html
  18
  19 Medium
  20 E-ink sharp 1.3" LCD
  21 - https://mbed.org/components/13-SHARP-Memory-LCD/
  22 LCD-S401
  23 - https://mbed.org/components/Lumex-LCD-S401/
  24
  25 Hard:
  26 RA8875 - 480x272 SPI 4 wire
  27 - https://mbed.org/components/RA8875-Based-Display/