capsensing

#include <CapacitiveSensor.h>

CapacitiveSensor cs = CapacitiveSensor(9,2);        // 10M resistor between pins 4 & 2, pin 2 is sensor pin, add a wire and or foil if desired
int minValue = 32767;
int maxValue = 0;

void setup(){
   cs.set_CS_AutocaL_Millis(0xFFFFFFFF);     // turn off autocalibrate on channel 1 - just as an example
   Serial.begin(9600);  
}

void loop(){
    long start = millis();
    long total =  cs.capacitiveSensor(30);
    
    minValue = min(total,minValue);
    if(minValue<total){
      minValue++;
    }
    maxValue = max(total,maxValue);
    
    float value = 1.0 * (total-minValue) / (maxValue - minValue);
    
    Serial.print(millis() - start);        // check on performance in milliseconds
    Serial.print("\t");                   // tab character for debug windown spacing

    delay(10);                             // arbitrary delay to limit data to serial port 
    Serial.print(total);
    Serial.print("\t");
   Serial.println(value);  
    tone(10,(1200*value)+400); 
}