Altitude hold : oh! you gave me another idea!
For the moment it will be an ALT+TIMER motor cut-out for moto-gliders for F5J-GR . I am trying to make a circuit that will cut motor after 30sec or to an ALT of 200m what comes first!
about your question I think we will have problems with internal 4mhz. I am thinking of going to 12f683 (8 Mhz internal) and more code space , we are in the limit here with f675. Also may be asm is used to pass servo pulses through and/or maybe as final solution we will go to an external low profile crystal and two decopuling caps.
I will experiment and see....
(Now I get 51m here (project running!) the funny thing is that I have closed the door of my lab now , the weather got very hot here now . I think there will be no problem with the calibration because the only think I want to measure is ALT differece of 200m so 1st you have to power the device just 1minutes before flight. It will read the ground alt and if 200m reached motor will cut that's all.
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