Atelier CAO

 /*********************************************************
 This is a library for the MPR121 12-channel Capacitive touch sensor
 
 Designed specifically to work with the MPR121 Breakout in the Adafruit shop 
   ----> https://www.adafruit.com/products/
 
 These sensors use I2C communicate, at least 2 pins are required 
 to interface
 
 Adafruit invests time and resources providing this open source code, 
 please support Adafruit and open-source hardware by purchasing 
 products from Adafruit!
 
 Written by Limor Fried/Ladyada for Adafruit Industries.  
 BSD license, all text above must be included in any redistribution
 **********************************************************/
 
 #include <Wire.h>
 #include "Adafruit_MPR121.h"
 #include <Adafruit_NeoPixel.h>
 #ifdef __AVR__
   #include <avr/power.h>
 #endif
 
 #define LEDSPIN 5
 // How many NeoPixels are attached to the Arduino?
 #define NUMPIXELS      30
 
 // Parameter 1 = number of pixels in strip
 // Parameter 2 = Arduino pin number (most are valid)
 // Parameter 3 = pixel type flags, add together as needed:
 //   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
 //   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
 //   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
 //   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
 Adafruit_NeoPixel strip = Adafruit_NeoPixel(60, LEDSPIN, NEO_GRB + NEO_KHZ800);
 
 // You can have up to 4 on one i2c bus but one is enough for testing!
 Adafruit_MPR121 cap = Adafruit_MPR121();
 
 // Keeps track of the last pins touched
 // so we know when buttons are 'released'
 uint16_t lasttouched = 0;
 uint16_t currtouched = 0;
 int maxlasttouched = 0 ;
 
 void setup() {
   //while (!Serial);        // needed to keep leonardo/micro from starting too fast!
   Serial.begin(9600);
   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!");
 
   // This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
   #if defined (__AVR_ATtiny85__)
     if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
   #endif
   // End of trinket special code
 
   strip.begin();
   strip.show(); // Initialize all pixels to 'off'
 }
 
 void loop() {
   // Get the currently touched pads
   currtouched = cap.touched();
   
   
   for (uint8_t i=0; i<12; i++) {
     // it if *is* touched and *wasnt* touched before, alert!
     if ((currtouched & _BV(i)) && !(lasttouched & _BV(i)) ) {
       Serial.print(i); Serial.println(" touched");
       strip.setPixelColor(i, strip.Color(150,150,150)); // Moderately bright green color.
       maxlasttouched = i;
     }
     // if it *was* touched and now *isnt*, alert!
     if (!(currtouched & _BV(i)) && (lasttouched & _BV(i)) ) {
       Serial.print(i); Serial.println(" released");
       //strip.setPixelColor(i, strip.Color(0,0,0)); // Moderately bright green color.
     }
   }
   
   int max = map(maxlasttouched,0,11,0,NUMPIXELS);
   int variation = map(maxlasttouched,0,11,0,255);
   for(int i=0;i<NUMPIXELS;i++){
     if(max>0){
       if(i%2 != 0 || maxlasttouched > 6){
        strip.setPixelColor(i, strip.Color(variation,variation,variation)); 
       }else{
        strip.setPixelColor(i, strip.Color(0,0,0)); 
       }
     }else{
        strip.setPixelColor(i, strip.Color(0,0,0)); 
     }
   }
   
   strip.show(); // This sends the updated pixel color to the hardware.
   // reset our state
   lasttouched = currtouched;
 }