per-board calibration needed
  battery voltage-divider ratio (Board.BatteryDivider)
  depth gauge
  AC detection 1 & 2
  Light: Light, dark, resistor
  current transformers
  voltage/wild dividers & diode drop

not checked at all
  XBee to base
  jogging DS1307
  lightning sensor
  VC0706/motion
  VC0706/snapshot
  voltage
  running on battery
  voltage/battery
  relay module



