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filter pump output

This commit is contained in:
Matthew Kennedy 2020-12-15 14:41:09 -08:00
parent 3fe5b76975
commit 2d5d6a0026
2 changed files with 8 additions and 1 deletions
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5
firmware/sampling.cpp
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@ -43,7 +43,10 @@ static void SamplingThread(void*)
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;
pumpCurrentSenseVoltage = 0.7f * pumpCurrentSenseVoltage + 0.3f * (result.PumpCurrentVoltage - result.VirtualGroundVoltageInt); // Exponential moving average (aka first order lpf)
pumpCurrentSenseVoltage =
(1 - PUMP_FILTER_ALPHA) * pumpCurrentSenseVoltage +
PUMP_FILTER_ALPHA * (result.PumpCurrentVoltage - result.VirtualGroundVoltageInt);
// Shift history over by one // Shift history over by one
r_3 = r_2; r_3 = r_2;

4
firmware/wideband_config.h
View File

@ -23,6 +23,10 @@
// LSU sense resistor - 61.9 ohms // LSU sense resistor - 61.9 ohms
#define LSU_SENSE_R (61.9f) #define LSU_SENSE_R (61.9f)
// Pump low pass filter alpha
// sampling at 2.5khz, alpha of 0.1 gives about 42hz bandwidth
#define PUMP_FILTER_ALPHA (0.1f)
// ******************************* // *******************************
// Pump controller // Pump controller
// ******************************* // *******************************