Real progress!

Added to the "Done" list:

• Altimeter is working
• ASI is working
• Tach is working (no sensor, just tested pulsing pin 2 line)
• Added an up/down button on digital 4 & 5 INPUT_PULLUP
• Barometer setting page.  If you hold the up or down button for a second, it switches to pressure setting mode.  if you let go for 2 seconds, it goes back to regular flight mode.  Local barometer is permanent, on reboot it will remember your last setting.
• Setup Mode: If you boot with up & down both pressed, it goes into setup mode.
       Pressing the down button selects the next parameter; up button sets and stores the current value
  
  Setup menu cycles through the following:

• Airspeed Sensor static pressure
• Airspeed Sensor 6.5" of Water (87kts)
• Oil Temp in Ice Water
• Oil Temp in Boiling water
• Oil Pressure Static
• Oil Pressure RunUp (assumed 80psi)
• Tested the sensors and "calibrate" functions on the ASI.  If you blow into it with a straw it goes nicely from 0 to 100+kts.  All set via calibration feature built in.

Issues:

I destroyed the compass sensor :(  by hooking up the 10DoF module backwards which put +5v on an 5v intolerant output pin of just the compass.  So I ordered another (cheaper 3-axis compas + BMP180 unit).  So yeah, can drop the cost even more. But it won't have 6-axis of acc/gyro.

Left to do:

• Re-wire to a permanent soldered board (currently just testing on a breadboard)
• Hook up the oil temp sensor, I have it, just needs a voltage splitter resistor and calibration
• Hook up the oil pressure.  I don't yet have this sensor, but same voltage splitter.
• Cleanup the code
• refactor into separate files each functions (init, normal, baro, setup)
• Make a smaller integer-math / degrees (vs radians) version of atan2
• Make a smaller integer-math barometer library (very large)