I am in the process of building a Boeing 727-200 using the Dreamfleet 727.
For the time-being, I have all the needed instruments.
I'm currently working on the engine gauges. I have successfully interfaced the N1 and N2 gauges using automotive stepper motors (SwitecX25/MCR 1109) with the Link2FS program and Arduino Uno and Mega 2650 boards.
I'm tackling the EPR gauges right now with the EGT and Fuel Flow gauges to follow.
Right now, I'm experiencing difficulties in getting the EPR 'numbers' to interface with Link2FS and Arduino.
I'm using the 08BC (Engine 1) offset and have read the FSUIPC SDK where it advises that EPR 1.6 = 16384. My gauge (mimicked from the Dreamfleet 727) will only go from 1.0 to 2.2, although the face of the 'real' gauge goes from 1.0 to 3.0.
I have tried all sorts of formulas using Int32, Double, Long and Short in the Link2FS--all to no avail.
For what its worth, the readings are as follows:
Using SHORT
1.09 = 15203 raw (at idle)
1.10 = 15889 raw
1.20 = 18034 raw
1.30 = 18359 raw
1.40 = 18569 raw
1.50 = 18779 raw
1.60 = 18985 raw
1.70 = 19145 raw
1.80 = 19305 raw
1.90 = 19363 raw
2.00 = 19450 raw
2.10 = 19527 raw
2.20 = 19639 raw (at max power)
The SHORT type seems to give the 'make sense' readings. Both Double and Int32 give identical readings.
I've also tried the alternate offset of 2030 without success.
If anyone reading this is familiar with the Link2FS program and can supply any advice as to what formula I could use to accurately duplicate via Link2FS and Arduino, I would certainly appreciate it.
Thank you very kindly.
Jay
KFLL
