MPR121 Capacitive Touch Sensor Synth

Projects Programming
3

Heres the modified code:

#include "mpr121.h"
#include <Wire.h>
#include "pitches.h"
#define speaker 11

int irqpin = 2; // Digital 2
boolean touchStates[12]; //to keep track of the previous touch states

void setup(){
 pinMode(irqpin, INPUT);
 digitalWrite(irqpin, HIGH); //enable pullup resistor
 
 Serial.begin(9600);
 Wire.begin();

 mpr121_setup();
}

void loop(){
 readTouchInputs();
}


void readTouchInputs(){
 if(!checkInterrupt()){
  
  //read the touch state from the MPR121
  Wire.requestFrom(0x5A,2); 
  
  byte LSB = Wire.read();
  byte MSB = Wire.read();
  
  uint16_t touched = ((MSB << 8) | LSB); //16bits that make up the touch states

  
  for (int i=0; i < 12; i++){ // Check what electrodes were pressed
   if(touched & (1<<i)){
   
    if(touchStates[i] == 0){
  //pin i was just touched
  Serial.print("pin ");
  Serial.print(i);
  Serial.println(" was just touched");


  switch (i) {
    case 0:
      //0 was touched

      break;
    case 1:
      //1 was touched

      break; 
    case 2:
      //2 was touched

      break; 
    case 3:
      //3 was touched
  }

}
    
    }else if(touchStates[i] == 1){
     //pin i is still being touched
    } 
   
    touchStates[i] = 1;   
   }else{
    if(touchStates[i] == 1){
     Serial.print("pin ");
     Serial.print(i);
     Serial.println(" is no longer being touched");
     
     //pin i is no longer being touched
   }
    
    touchStates[i] = 0;
   }
  
  }
  
 }
}




void mpr121_setup(void){

 set_register(0x5A, ELE_CFG, 0x00); 
 
 // Section A - Controls filtering when data is > baseline.
 set_register(0x5A, MHD_R, 0x01);
 set_register(0x5A, NHD_R, 0x01);
 set_register(0x5A, NCL_R, 0x00);
 set_register(0x5A, FDL_R, 0x00);

 // Section B - Controls filtering when data is < baseline.
 set_register(0x5A, MHD_F, 0x01);
 set_register(0x5A, NHD_F, 0x01);
 set_register(0x5A, NCL_F, 0xFF);
 set_register(0x5A, FDL_F, 0x02);
 
 // Section C - Sets touch and release thresholds for each electrode
 set_register(0x5A, ELE0_T, TOU_THRESH);
 set_register(0x5A, ELE0_R, REL_THRESH);

 set_register(0x5A, ELE1_T, TOU_THRESH);
 set_register(0x5A, ELE1_R, REL_THRESH);
 
 set_register(0x5A, ELE2_T, TOU_THRESH);
 set_register(0x5A, ELE2_R, REL_THRESH);
 
 set_register(0x5A, ELE3_T, TOU_THRESH);
 set_register(0x5A, ELE3_R, REL_THRESH);
 
 set_register(0x5A, ELE4_T, TOU_THRESH);
 set_register(0x5A, ELE4_R, REL_THRESH);
 
 set_register(0x5A, ELE5_T, TOU_THRESH);
 set_register(0x5A, ELE5_R, REL_THRESH);
 
 set_register(0x5A, ELE6_T, TOU_THRESH);
 set_register(0x5A, ELE6_R, REL_THRESH);
 
 set_register(0x5A, ELE7_T, TOU_THRESH);
 set_register(0x5A, ELE7_R, REL_THRESH);
 
 set_register(0x5A, ELE8_T, TOU_THRESH);
 set_register(0x5A, ELE8_R, REL_THRESH);
 
 set_register(0x5A, ELE9_T, TOU_THRESH);
 set_register(0x5A, ELE9_R, REL_THRESH);
 
 set_register(0x5A, ELE10_T, TOU_THRESH);
 set_register(0x5A, ELE10_R, REL_THRESH);
 
 set_register(0x5A, ELE11_T, TOU_THRESH);
 set_register(0x5A, ELE11_R, REL_THRESH);
 
 // Section D
 // Set the Filter Configuration
 // Set ESI2
 set_register(0x5A, FIL_CFG, 0x04);
 
 // Section E
 // Electrode Configuration
 // Set ELE_CFG to 0x00 to return to standby mode
 set_register(0x5A, ELE_CFG, 0x0C); // Enables all 12 Electrodes
 
 
 // Section F
 // Enable Auto Config and auto Reconfig
 /*set_register(0x5A, ATO_CFG0, 0x0B);
 set_register(0x5A, ATO_CFGU, 0xC9); // USL = (Vdd-0.7)/vdd*256 = 0xC9 @3.3V  set_register(0x5A, ATO_CFGL, 0x82); // LSL = 0.65*USL = 0x82 @3.3V
 set_register(0x5A, ATO_CFGT, 0xB5);*/ // Target = 0.9*USL = 0xB5 @3.3V
 
 set_register(0x5A, ELE_CFG, 0x0C);
 
}


boolean checkInterrupt(void){
 return digitalRead(irqpin);
}


void set_register(int address, unsigned char r, unsigned char v){
  Wire.beginTransmission(address);
  Wire.write(r);
  Wire.write(v);
  Wire.endTransmission();
}

And here are the error messages I'm getting:

Arduino: nightly (Mac OS X), Board: "Arduino Leonardo"

Capacitive_Touch.ino: In function 'void readTouchInputs()':
Capacitive_Touch:61: error: expected primary-expression before '}' token
Capacitive_Touch:61: error: expected ;' before '}' token Capacitive_Touch:70: error: expected }' before 'else'
Capacitive_Touch:71: error: 'i' was not declared in this scope
Capacitive_Touch:79: error: 'i' was not declared in this scope
Capacitive_Touch.ino: At global scope:
Capacitive_Touch:84: error: expected declaration before '}' token

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