103 lines
3.6 KiB
Text
103 lines
3.6 KiB
Text
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var debug_enabled = 0;
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## helpers
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#
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var FT2M=0.30480;
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var KT2MPS=1852/3600;
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var square=func(x) return x*x;
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var get_delta=func (current,previous) {return (current-previous);}
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var state = {new:func {return{parents:[state]};},altitude_m:0,airspeed_mps:0,timestamp:0,te_read:0};
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var samples = []; setsize(samples, 30);
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var te_needle =0;
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setprop("/instrumentation/ilec-sc7/te-reading-mps",0);
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setprop("/instrumentation/ilec-sc7/volume",0.8);
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setprop("/instrumentation/ilec-sc7/audio",2);
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setprop("/instrumentation/ilec-sc7/mode",1);
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setprop("/instrumentation/ilec-sc7/sensitivity",1);
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setprop("/instrumentation/ilec-sc7/filter",0.05);
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var update_state = func {
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var s = state.new();
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s.altitude_m=getprop("/position/altitude-ft")*FT2M;
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s.airspeed_mps=getprop("/velocities/airspeed-kt")*KT2MPS;
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s.timestamp=systime();
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return s;
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}
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var push30 = func {
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var i = 0;
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while ( i < 30 ) {
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samples[i]=0;
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i += 1;
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};
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}
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##
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# debug info
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var s_dump = func(s) {
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print(s.timestamp," ", s.altitude_m, " ", s.airspeed_mps);
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}
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var averager = func {
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var sum = 0 ;
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var i = 0;
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while ( i < 29 ) {
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samples[i] = samples[i+1]; # shift everything to the "left"
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i += 1;
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};
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samples[29] = te_needle; # and set last sample to current
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i = 0;
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while ( i < 30 ) {
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sum = sum + samples[i];
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i += 1;
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};
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var average30 = sum / 30;
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setprop("/instrumentation/ilec-sc7/average",math.abs(average30));
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setprop("/instrumentation/ilec-sc7/average-sign",math.sgn(average30));
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if (debug_enabled) print (" average ",average30);
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settimer(averager, 1); # update rate
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}
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var tvario = {
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new: func {return {parents:[tvario]};},
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state:{previous:,current:},
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init: func {state.previous=state.new(); state.current=state.new();},
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update:func {
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if (debug_enabled) print("\nUpdating TEV:");
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state.current = update_state();
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if (debug_enabled) {
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s_dump(state.current);
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s_dump(state.previous);
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}
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var delta_t = get_delta(state.current.timestamp, state.previous.timestamp);
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# TE reading = (h2-h1)/t + (v2^2 - v1^2) / 19.62*t
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if (debug_enabled) print("delta_t:",delta_t);
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var uncompensated = get_delta(state.current.altitude_m,state.previous.altitude_m) / delta_t;
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if (debug_enabled) print(" uncompensated:",uncompensated);
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var adjustment = get_delta(square(state.current.airspeed_mps),square(state.previous.airspeed_mps)) / (19.62 * delta_t);
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if (debug_enabled) print(" adjustment:",adjustment,"\n");
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var te_reading = uncompensated + adjustment;
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if (debug_enabled) print (" te_reading:",te_reading);
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te_needle = getprop("/instrumentation/ilec-sc7/te-reading-mps");
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var filter = 0.01 + 0.02 * getprop("/instrumentation/ilec-sc7/sensitivity");
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setprop("/instrumentation/ilec-sc7/filter",filter);
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te_needle = te_needle * (1-filter) + filter * te_reading;
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setprop("/instrumentation/ilec-sc7/te-reading-mps",te_needle);
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setprop("/instrumentation/ilec-sc7/te-reading-neg",-te_needle);
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state.previous = state.current; # save current state for next call
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settimer(func me.update(), 1/20); # update rate
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}
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};
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var tv = tvario.new();
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tv.init();
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tv.update();
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push30();
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averager();
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