Sensor data log not reporting correctly

[vlittle]

I have defined a Degree-Volts function that takes the output of my ignition controller which provides 10 mV per degree of timing advance.

This function displays properly on my engine screen.  It normally reads 0 with the ignition off, 20 (degrees) with the ignition on, and varies with timing advance in flight.

However, the data log shows either 0 or 9.999 when the ignition is on.

Is there a setup or parameter that needs to be tweaked for this to be displayed properly in the log?


Thanks, Vern

+sensor={
id=ELECTROAIR TIMING METER
function=VOLTS
pins=C37_P31 C37_PIN8 C37_PIN22
name=TIMING
name=DEGREE
name=BTDC
min_val=0
max_val=40
resolution=0
round=1
is_piecewise=0
low_coeff={
c_x4=0
c_x3=0
c_x2=0
c_x1=100
c_x0=0
}
low_resistance=NONE
low2high_cross=0
high_coeff={
c_x4=0
c_x3=0
c_x2=0
c_x1=0
c_x0=0
}
high_resistance=NONE
high2low_cross=0
window=.1
shift=5
age=16
}

 

[dynonsupport]

Vern,
You're running into a known limitation, where inputs defined as voltages have a max value in the datalog of 9.999. Not 9.999V, but 9.999 after you do the math.

Here' s a discussion about this from before, and some possible solutions:

http://dynonavionics.com/cgi-bin/yabb2/YaBB.pl?num=1364499916

 

[vlittle]

Thanks, my readout is now "BTDC PSI" rather than "BTDC VOLTS". Neither makes sense, but PSI is at least closer to the principal of timing advance based on air pressure.

Vern