Counting the number of touches_MPR121

Projects Programming
1

Hi Everyone,
I am new to programming and Arduino. I am using Adafruit MPR121 Capacitive Touch Sensor. What I want to do is to count the number of touches for each touchpad.
For example, when I touch the touchpad 0 once, then it says touched once. I touch it twice, and it says touched twice and so forth. When I touch the touchpad 6, it says touched once. However, the code I have for now is counting the number of touches for all, not counting for the individual touchpad.

Instead of writing for each pad separately, how to write a loop to make it easier?
Here is my code:

#include <Wire.h>
#include "Adafruit_MPR121.h"
#ifndef _BV
#define _BV(bit) (1 << (bit)) 
#endif
uint16_t lasttouched = 0;
uint16_t currtouched = 0;
Adafruit_MPR121 cap = Adafruit_MPR121();
uint8_t touchThreshold = 100;
uint8_t releaseThreshold = 40;

int TouchCounter = 0;   // counter for the number of touches
unsigned long lastDebounceTime = 0; 
unsigned long debounceDelay = 50;   


void setup() {
  Serial.begin(9600);

  while (!Serial) { // needed to keep leonardo/micro from starting too fast!
    delay(10);
  }

  Serial.println("Adafruit MPR121 Capacitive Touch sensor test"); 
  
  // Default address is 0x5A, if tied to 3.3V its 0x5B
  // If tied to SDA its 0x5C and if SCL then 0x5D
  if (!cap.begin(0x5A)) {
    Serial.println("MPR121 not found, check wiring?");
    while (1);
  }
  Serial.println("MPR121 found!");

}

void loop() {
  currtouched = cap.touched();
  for (uint8_t i=0; i<12; i++) {
    if ((currtouched & _BV(i)) && !(lasttouched & _BV(i))) {
      lastDebounceTime = millis();
    }
     if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:
   
    if (!(currtouched & _BV(i)) && (lasttouched & _BV(i))) {
      TouchCounter++;
      if (TouchCounter == 1) {
        Serial.print(i); Serial.println(" Touched Once");
        delay(50);}
      if (TouchCounter ==2) {
        Serial.print(i); Serial.println(" Touched Twice");
        delay(50);}
       if (TouchCounter >2) {
        Serial.print(i); Serial.println(" Playing");
        delay(50);}
       }
      }
     }
   // reset our state
   lasttouched = currtouched;
   return;
  
  // debugging info, what
  Serial.print("\t\t\t\t\t\t\t\t\t\t\t\t\t 0x"); Serial.println(cap.touched(), HEX);
  Serial.print("Filt: ");
  for (uint8_t i=0; i<12; i++) {
    Serial.print(cap.filteredData(i)); Serial.print("\t");
  }
  Serial.println();
  Serial.print("Base: ");
  for (uint8_t i=0; i<12; i++) {
    Serial.print(cap.baselineData(i)); Serial.print("\t");
  }
  Serial.println();
  
  // put a delay so it isn't overwhelming
  delay(100);
}

I have attached the image of the current result. It is not counting individual touchpad separately.

Thank you very much.

Screen Shot 2020-04-09 at 7.49.57 AM.png
Screen Shot 2020-04-09 at 7.49.57 AM.png1044×756 116 KB

2

you only have one TouchCounter variable which is incremented for all pads.

do you want TouchCounter to be an array, "int TouchCounter [12] = {};" and in your code increment the count for a specific pad "TouchCounter ++;"?
also, you can simplify your debouncing by simply added a 50 msec delay to loop()

3

gcjr:
you only have one TouchCounter variable which is incremented for all pads.

do you want TouchCounter to be an array, "int TouchCounter [12] = {};" and in your code increment the count for a specific pad "TouchCounter ++;"?
also, you can simplify your debouncing by simply added a 50 msec delay to loop()
[/quote]
Hi, yeah, this is exactly what I wanted. I tried adding the array and it worked! Thanks!