95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
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#ifndef _WATERLEVEL_H_
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#define _WATERLEVEL_H_
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#include <Wire.h>
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#include <VL6180X.h> //https://github.com/pololu/vl6180x-arduino
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VL6180X sensor;
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// To try different scaling factors, change the following define.
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// Valid scaling factors are 1, 2, or 3.
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#define SCALING 1
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#define READINTERVAL_WATERLEVEL 200
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#define WATERLEVELMEAN_SIZE 32
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#define WATERLEVELMEAN_FILTER_CUTOFF 8 //max value is around WATERLEVELMEAN_SIZE/2
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float waterlevelMean_array[WATERLEVELMEAN_SIZE];
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uint16_t waterlevelMean_array_pos=0;
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#define WATERLEVEL_UNAVAILABLE -1
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float waterlevel=WATERLEVEL_UNAVAILABLE; //distance from floor to water surface [mm]
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float watervolume=WATERLEVEL_UNAVAILABLE; //calculated Volume in Reservoir
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//Calibration
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float waterlevel_calib_offset_measured=86; //Sollwert
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float waterlevel_calib_offset_sensor=78; //Istwert
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//raw reading is 78mm, ruler reads 86mm. VL8160 sensor is 169mm above bottom of reservoir.
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float waterlevel_calib_reservoirArea=27*36.5; //area in cm^2
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float waterlevel_heightToVolume(float distance);
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mqttValueTiming timing_waterlevel;
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void waterlevel_setup() {
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timing_waterlevel.minchange=0.0;
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timing_waterlevel.maxchange=3.0;
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timing_waterlevel.mintime=30*000;
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timing_waterlevel.maxtime=60*60*1000;
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Wire.begin();
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sensor.init();
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sensor.configureDefault();
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sensor.setScaling(SCALING);
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sensor.setTimeout(500);
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for (uint16_t i=0;i<WATERLEVELMEAN_SIZE;i++) {
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waterlevelMean_array[i]=-1; //-1 is also timeout value
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}
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}
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void waterlevel_loop(unsigned long loopmillis) {
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static unsigned long last_read_waterlevel;
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if (loopmillis>=last_read_waterlevel+READINTERVAL_WATERLEVEL) {
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last_read_waterlevel=loopmillis;
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uint16_t distance=sensor.readRangeSingleMillimeters();
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Serial.print("Distance reading:"); Serial.println(distance);
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if (distance!=WATERLEVEL_UNAVAILABLE) { //successful
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waterlevelMean_array[waterlevelMean_array_pos]=distance;
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waterlevelMean_array_pos++;
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waterlevelMean_array_pos%=WATERLEVELMEAN_SIZE;
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}
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if (isValueArrayOKf(waterlevelMean_array,WATERLEVELMEAN_SIZE,WATERLEVEL_UNAVAILABLE)){
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float _filteredDistance=getFilteredf(waterlevelMean_array,WATERLEVELMEAN_SIZE,WATERLEVELMEAN_FILTER_CUTOFF);
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//Invert distance and offset
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waterlevel=(waterlevel_calib_offset_sensor+waterlevel_calib_offset_measured)-_filteredDistance;
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watervolume=waterlevel_heightToVolume(waterlevel);
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//float _meanWaterlevel=getMeanf(waterlevelMean,WATERLEVELMEAN_SIZE);
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//Serial.print("\t Dist="); Serial.print(_filteredWaterlevel); Serial.print("mm"); Serial.print("(+- "); Serial.print((getMaxf(waterlevelMean,WATERLEVELMEAN_SIZE)-getMinf(waterlevelMean,WATERLEVELMEAN_SIZE))/2.0); Serial.print(")"); Serial.print(" [mean="); Serial.print(_meanWaterlevel); Serial.print("]");
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}
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}
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}
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float waterlevel_heightToVolume(float distance){
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return waterlevel_calib_reservoirArea/100 * distance/100; //area[cm^2] in dm^2 * height in dm = dm^3= L
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}
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#endif
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