This is a picture of the IAS indicator before the modification. The main change will be the dial scale , this one was adapted for the stepper motor.
Here you are a excel graphic showing the relation between the speed and the degrees (dial scale) in C172 indicator. The difficulty is from 0 to 40 Kts and 50 to 110 Kts. After the values seem linear.
In the reality, The IAS indicator respond to the air law given by the static and total pressure. The difference between both give the speed value.
Looking this graphic, one possibility to realize the better possible a straight line with Arduino , is to cut into some parts the trend line.
By example: the range 0 - 40 Kts seems a straight line, 40 to 70 Kts, 70 to +/- 90 Kts, and so on.
I know the different values must be translated in Arduino language with perhaps many 'IF' conditions.
I think also , a test program will be very useful to determine the angular relation with the speed.
Here you are a excel graphic showing the relation between the speed and the degrees (dial scale) in C172 indicator. The difficulty is from 0 to 40 Kts and 50 to 110 Kts. After the values seem linear.
In the reality, The IAS indicator respond to the air law given by the static and total pressure. The difference between both give the speed value.
Looking this graphic, one possibility to realize the better possible a straight line with Arduino , is to cut into some parts the trend line.
By example: the range 0 - 40 Kts seems a straight line, 40 to 70 Kts, 70 to +/- 90 Kts, and so on.
I know the different values must be translated in Arduino language with perhaps many 'IF' conditions.
I think also , a test program will be very useful to determine the angular relation with the speed.
This graphic it's only usable for this indicator:
Aucun commentaire:
Enregistrer un commentaire