Arduino capacitive touch sensor help

Question

So I have been messing around with the Arduino Capsense library with the immensely helpful guide; http://www.instructables.com/id/How-To-Use-Touch-Sensors-With-Arduino/ (many thanks to DangerousTim!) using the code provided, i managed to get a relay to operate with a sensor. It worked great and I was able to adjust the distance and sensitivity. But when i tried adding another sensor and relay, it stopped working. I've been trying to isolate the problem for a while now and have gotten nowhere. I'm hoping someone can help me, here's the original code for the single sensor and relay;

#include <CapacitiveSensor.h>
#include <CapacitiveSensor.h> //change '42' to any desired pin...
long time = 0;
int state = HIGH;
boolean yes;
boolean previous = false;
int debounce = 200;
CapacitiveSensor cs_4_2 = CapacitiveSensor(4,2);
// To add more sensors...
//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);
 pinMode(13, OUTPUT);
}
void loop()
{
 long total1 = cs_4_2.capacitiveSensor(30);
 if (total1 > 60){yes = true;}
 else {yes = false;}
 // to toggle the state of state
 if(yes == true && previous == false && millis() - time>debounce){
 if(state == LOW){
 state = HIGH; }
 else state = LOW;
 time = millis();
 }
 digitalWrite(13, state);
 previous = yes;
 delay(10);
}

and here's the code for the two sensors and relays

#include <CapacitiveSensor.h>
int led = 13;
int led2 = 12;
long time = 0;
int state = HIGH;
long time2 = 0;
int state2 = HIGH;
boolean yes;
boolean previous = false;
boolean yes2;
boolean previous2 = false;
int debounce = 200;
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_5_7 = CapacitiveSensor(4,6);
void setup()
{
 cs_4_2.set_CS_AutocaL_Millis(0xFFFFFFFF);
 cs_5_7.set_CS_AutocaL_Millis(0xFFFFFFFF); //Calibrate the sensor...
 pinMode(led, OUTPUT);
 pinMode(led2, OUTPUT);
}
void loop()
{
 int total1 = cs_4_2.capacitiveSensor(30);
 Serial.println(total1);
 int total2 = cs_5_7.capacitiveSensor(30);
 if (total1 > 60){yes = true;}
 else {yes = false;}
 if (total2 > 60){yes2 = true;}
 else {yes2 = false;}
 // to toggle the state of state
 if(yes == true && previous == false && millis() - time>debounce){
 if(state == LOW){
 state = HIGH;
 }
 else
 state = LOW;
 time = millis();
 }
 if(yes2 == true && previous2 == false && millis() - time2>debounce){
 if(state2 == LOW){
 state2 = HIGH;
 }
 else
 state2 = LOW;
 time2 = millis();
 }
 digitalWrite(led, state);
 previous = yes;
 digitalWrite(led2, state2);
 previous2 = yes2;
 delay(10);
}

• Edgar Bonet: Maybe you wired sensor cs_5_7 to pins 5 and 7, as it's name misleadingly suggests...

Answer 1

I think you are making a mistake initializing cs_5_7.

CapacitiveSensor cs_4_2 = CapacitiveSensor(4,2);
CapacitiveSensor cs_5_7 = CapacitiveSensor(4,6);

You are using same pin 4 for both Capacitive sensors. Try using different pins. I am quite sure that, this would help.

• Edgar Bonet: The library documentation says it's OK to share the send pin among several sensors.