watercounter/water-counter
watercounter
/
water-counter
mirror of https://github.com/skaringa/water-counter.git
1
0
Fork 0
Code Issues Releases Wiki Activity

Simplified low pass filter

This commit is contained in:
Martin Kompf 2019-02-10 17:00:06 +01:00
parent 8485b87bbf
commit 964011e832
1 changed files with 9 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
arduino_sketch/ReflectorLightBarrier.ino
View File

@ -33,10 +33,9 @@ int sensorValue = 0; // difference sensorValueOn - sensorValueOff
float filteredValue; // filtered sensor value
// definitions for low pass filter
#define FILTER_LEN 6
float buffer[FILTER_LEN];
int startBuf = 0;
int lenBuf = 0;
float filterAlpha = 0.1f;
float filterOut = 0;
boolean filterLoad = true;
// command line
#define MAX_CMD_LEN 80
@ -175,20 +174,15 @@ void doCommand() {
* Low pass filter to eleminate spikes
*/
float lowpass(int value) {
if (lenBuf < FILTER_LEN) {
lenBuf++;
if (filterLoad) {
filterOut = value;
filterLoad = false;
}
buffer[startBuf++] = (float) value;
if (startBuf >= FILTER_LEN) {
startBuf = 0;
}
float sum = 0;
for (int i = 0; i < lenBuf; ++i) {
sum += buffer[i];
}
return sum / lenBuf;
filterOut = filterAlpha * value + (1.f - filterAlpha) * filterOut;
return filterOut;
}
/**
* Setup.
*/