Code Example

Here is the code for the distance sensor. It kind of worked but it wasn't always easy.

                   #include 

                    /*
                     * CapitiveSense Library Demo Sketch
                     * Paul Badger 2008
                     * Uses a high value resistor e.g. 10M between send pin and receive pin
                     * Resistor effects sensitivity, experiment with values, 50K - 50M. Larger resistor values yield larger sensor values.
                     * Receive pin is the sensor pin - try different amounts of foil/metal on this pin
                     */


                    CapacitiveSensor   cs_4_2 = CapacitiveSensor(4,2);        // 10M resistor between pins 4 & 2, pin 2 is sensor pin, add a wire and or foil if desired
                    CapacitiveSensor   cs_4_6 = CapacitiveSensor(4,6);        // 10M resistor between pins 4 & 6, pin 6 is sensor pin, add a wire and or foil
                    CapacitiveSensor   cs_4_8 = CapacitiveSensor(4,8);        // 10M resistor between pins 4 & 8, pin 8 is sensor pin, add a wire and or foil

                    void setup()
                    {
                       cs_4_2.set_CS_AutocaL_Millis(0xFFFFFFFF);     // turn off autocalibrate on channel 1 - just as an example
                        pinMode(13, OUTPUT);
                       Serial.begin(9600);
                    }

                    void loop()
                    {
                        long start = millis();
                        long total1 =  cs_4_2.capacitiveSensor(10);
                        long total2 =  cs_4_6.capacitiveSensor(10);
                        long total3 =  cs_4_8.capacitiveSensor(10);

                        Serial.print(millis() - start);        // check on performance in milliseconds
                        Serial.print("\t");                    // tab character for debug windown spacing

                        Serial.print(total1);                  // print sensor output 1
                        Serial.print("\t");
                        Serial.print(total2);                  // print sensor output 2
                        Serial.print("\t");
                        Serial.println(total3);                // print sensor output 3

                        if(total2 > 5){
                            digitalWrite(13, HIGH);
                         delay(1000);

                        }
                        else{
                           digitalWrite(13, LOW);
                          delay(1000);
                        }


                        delay(5);                             // arbitrary delay to limit data to serial port
                    }