//Bodenfeuchte
// ********** Get Bodenfeuchte***********
// WatermarkPin = D7; // select the pin watermark Sensor
// sensorPin = A3; // select the input pin for Voltage Reading (mid of Voltage divider)
// ResistorPin = D6; // select the pin for the 18k Resistor
if ((currentTime - previousTimeBF) >= intervalBFUser) {
digitalWrite(WatermarkPin, LOW);
digitalWrite(ResistorPin, HIGH);
delay(100);
long start = micros();
int currentVoltage = analogRead(sensorPin);
long end = micros();
//convert Voltage to Resistance
unsigned int R=18;
float U=3.3; //Should we better measure the voltage?
float currentR = R/(U/currentVoltage-1) *1000; // current resistance of Watermark Sensor in Ohm
//convert Resistance to Feuchtigkeit
float soilTemp=10;
float currentBF=-((4.093+3.213*currentR)/(1-0.009733*currentR-0.01205*soilTemp))*10; //unit hPa, convert to positive Values
#ifdef DEBUG
DEBUG.print("currentV: ");
DEBUG.println(currentVoltage);
DEBUG.print("currentR: ");
DEBUG.println(currentR);
DEBUG.print("currentBF: ");
DEBUG.println(currentBF);
DEBUG.print("time: ");
DEBUG.println((end-start));
#endif
if (currentBF < 900) {
switch (typeBF) {
case 0:
Knx.write(7, currentBF);
break;
case 1:
if (abs(currentBF * 100 - previousBF * 100) >= diffBFUser * 100) {
Knx.write(7, currentBF);
previousBF = currentBF;
}
default:
break;
}
limitReached(currentBF, limitBFMin, limitBFMax, 8, 9, valueBFMin, valueBFMax);
previousTimeBF = currentTime;
}
}
//invert the Voltage
unsigned int WatermarkPinStatus=digitalRead(WatermarkPin);
digitalWrite(WatermarkPin, !WatermarkPinStatus);
digitalWrite(ResistorPin, WatermarkPinStatus);
//End Bodenfeuchte
if ((currentTime - previousTimeBF) <= (intervalBFUser/2) ) {
//first half of Interval: invert voltage
if (measureReady) { // only change if needed, i.e. if not WatermarkPin=HIGH already ; We store this in a variable in order to prevent a read.
digitalWrite(WatermarkPin, HIGH);
digitalWrite(ResistorPin, LOW);
measureReady=0;
}
}
else {
if (!measureReady) { // only change if needed, i.e. if not WatermarkPin=LOW already
voltageFlipTime=millis();
digitalWrite(WatermarkPin, LOW);
digitalWrite(ResistorPin, HIGH);
measureReady=1;
}
}
if ( ( (currentTime - previousTimeBF) >= intervalBFUser ) && (currentTime-voltageFlipTime > 200) ) {
// hier die Messung
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