rusefi
/
wideband
mirror of https://github.com/rusefi/wideband.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

comments

This commit is contained in:
Matthew Kennedy 2020-10-29 03:11:48 -07:00
parent fbc6430aba
commit 8e34dca1c2
1 changed files with 1 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
firmware/sampling.cpp
View File

@ -30,14 +30,13 @@ static void SamplingThread(void*)
float r_1 = result.NernstVoltage; float r_1 = result.NernstVoltage;
// Compute results
// r2_opposite_phase estimates where the previous sample would be had we not been toggling // r2_opposite_phase estimates where the previous sample would be had we not been toggling
// AKA the absolute value of the difference between r2_opposite_phase and r2 is the amplitude // AKA the absolute value of the difference between r2_opposite_phase and r2 is the amplitude
// of the AC component on the nernst voltage. We have to pull this trick so as to use the past 3 // of the AC component on the nernst voltage. We have to pull this trick so as to use the past 3
// samples to cancel out any slope in the DC (aka actual nernst cell output) from the AC measurement // samples to cancel out any slope in the DC (aka actual nernst cell output) from the AC measurement
float r2_opposite_phase = (r_1 + r_3) / 2; float r2_opposite_phase = (r_1 + r_3) / 2;
// Compute AC (difference) and DC (average) components
nernstAc = f_abs(r2_opposite_phase - r_2); nernstAc = f_abs(r2_opposite_phase - r_2);
nernstDc = (r2_opposite_phase + r_2) / 2; nernstDc = (r2_opposite_phase + r_2) / 2;