/*
BO-100 as analog input divider to read distance on a linear Pot
Circuit required
BO-100 Kard in Slot 0
   0 ohm r5,12,15,22,25,32,35,42
   1k ohm r10,20,30,40
0-10K pot on inputs C0P0-C0P3 wiper, low side connected to ground, high side floating
*/

void setup(){
  pinMode(C0IO0,INPUT);
  pinMode(C0IO1,INPUT);
  pinMode(C0IO2,INPUT);
  pinMode(C0IO3,INPUT);
  Serial.begin(115200);
}

void loop(){
  Serial.print("Zero: "); //tag
  Serial.println(CalcPosition(analogRead(C0IO0)),4);//print calculated position
  Serial.print("One: "); //tag
  Serial.println(CalcPosition(analogRead(C0IO1)),4);//print calculated position
  Serial.print("Two: "); //tag
  Serial.println(CalcPosition(analogRead(C0IO2)),4);//print calculated position
  Serial.print("Three: "); //tag
  Serial.println(CalcPosition(analogRead(C0IO3)),4);//print calculated position
  delay(1000);
}

//returns distance down sensor where touch is or -1 when untouched
double CalcPosition(unsigned int input)
{
  const double length_mm = 100;
  //resistor divider has range of 0-3v while connected
  const double max_read_in_range = 1023*3/3.3; //3.3 is adc vRef, 1023 is adc full scale count
  double calculated = (double)input/max_read_in_range*length_mm; //
  if(input>max_read_in_range+10){ // add a little for errors and unconnected is 1023
    return -1;
  } else {
    return calculated;
  }
}