Capacitive Sensor

capacitivesensor.ino

#include <CapacitiveSensor.h>

CapacitiveSensor c = CapacitiveSensor(13, 12);
float observedRightValue  = 1750.0;
float observedLeftValue= 5000.0;

void setup() {
  Serial.begin(9600);
}

void loop() {
  float capacitorValue = c.capacitiveSensor(30);
  // How far the finger is from left to right
  if (capacitorValue > observedLeftValue || capacitorValue < observedRightValue) {
    // The finger isn't touching the capacitor
  } else {
    float valueInCentimeters = (observedLeftValue - capacitorValue) / (observedLeftValue - observedRightValue) * 8;
    Serial.println(valueInCentimeters);
  }
}