Wakeup Arduino da interrupt con ADXL345

Attenzione: per errore e' riportato che VCC del breakout di ADXL345 debba essere collegata a 5V mentre in realta' deve essere collegato a 3.3 V
----------------------------------------------------------------------

Questo post e' il gemello del precedente utlizzando pero' ADXL345
Il codice e' stato completamente ripreso da questo post 

Ho rimosso un po' di linee per rendere il codice piu' leggibile

In pratica se viene generato un interrupt di Inactivity l'arduino va in sleep. L'ADXL345 e' settato alla massima sensibilita' con una soglia di 75 ed un tempo prima di considerarsi inattivo di 3 secondi

---------------------------------------------------
#include <SparkFun_ADXL345.h>         // SparkFun ADXL345 Library
#include <LowPower.h>

ADXL345 adxl = ADXL345();             // USE FOR I2C COMMUNICATION


int interruptPin = 2;                 // Setup pin 2 to be the interrupt pin (for most Arduino Boards)
const int wakeUpPin = 2;                //For good accelaration return values I comment out this

void wakeUp()
{

}

void setup(){
  
  Serial.begin(9600);                 // Start the serial terminal
  Serial.flush();
  
  adxl.powerOn();                     // Power on the ADXL345
  adxl.setRangeSetting(2);           // Give the range settings
                                      // Accepted values are 2g, 4g, 8g or 16g
                                      // Higher Values = Wider Measurement Range
                                      // Lower Values = Greater Sensitivity

  adxl.setSpiBit(0);                  // Configure the device to be in 4 wire SPI mode when set to '0' or 3 wire SPI mode when set to 1
                                      // Default: Set to 1
                                      // SPI pins on the ATMega328: 11, 12 and 13 as reference in SPI Library 
   
  adxl.setActivityXYZ(1, 1, 1);       // Set to activate movement detection in the axes "adxl.setActivityXYZ(X, Y, Z);" (1 == ON, 0 == OFF)
  adxl.setActivityThreshold(75);      // 62.5mg per increment   // Set activity   // Inactivity thresholds (0-255)

  adxl.setInactivityXYZ(1, 1, 1);     // Set to detect inactivity in all the axes "adxl.setInactivityXYZ(X, Y, Z);" (1 == ON, 0 == OFF)
  adxl.setInactivityThreshold(75);    // 62.5mg per increment   // Set inactivity // Inactivity thresholds (0-255)
  adxl.setTimeInactivity(3);         // How many seconds of no activity is inactive?

  adxl.setTapDetectionOnXYZ(0, 0, 1); // Detect taps in the directions turned ON "adxl.setTapDetectionOnX(X, Y, Z);" (1 == ON, 0 == OFF)

  // Set values for what is considered a TAP and what is a DOUBLE TAP (0-255)
  adxl.setTapThreshold(50);           // 62.5 mg per increment
  adxl.setTapDuration(15);            // 625 μs per increment
  adxl.setDoubleTapLatency(80);       // 1.25 ms per increment
  adxl.setDoubleTapWindow(200);       // 1.25 ms per increment

  // Set values for what is considered FREE FALL (0-255)
  adxl.setFreeFallThreshold(7);       // (5 - 9) recommended - 62.5mg per increment
  adxl.setFreeFallDuration(30);       // (20 - 70) recommended - 5ms per increment

  // Setting all interupts to take place on INT1 pin
  adxl.setImportantInterruptMapping(1, 1, 1, 1, 1);     // Sets "adxl.setEveryInterruptMapping(single tap, double tap, free fall, activity, inactivity);" 
                                                        // Accepts only 1 or 2 values for pins INT1 and INT2. This chooses the pin on the ADXL345 to use for Interrupts.
                                                        // This library may have a problem using INT2 pin. Default to INT1 pin.
  
  // Turn on Interrupts for each mode (1 == ON, 0 == OFF)
  adxl.InactivityINT(1);
  adxl.ActivityINT(1);
  adxl.FreeFallINT(1);
  adxl.doubleTapINT(1);
  adxl.singleTapINT(1);
  
 attachInterrupt(digitalPinToInterrupt(interruptPin), ADXL_ISR, RISING);   // Attach Interrupt
  pinMode(wakeUpPin, INPUT); 

}

void loop(){

    attachInterrupt(0, wakeUp, RISING);
  int x,y,z;   
  adxl.readAccel(&x, &y, &z);       

  Serial.print(x);
  Serial.print(", ");
  Serial.print(y);
  Serial.print(", ");
  Serial.println(z); 
  
  ADXL_ISR();
}

void ADXL_ISR() {
  byte interrupts = adxl.getInterruptSource();
  
  // Free Fall Detection
  if(adxl.triggered(interrupts, ADXL345_FREE_FALL)){
    Serial.println("*** FREE FALL ***");
    //add code here to do when free fall is sensed
  } 
  
  // Inactivity
  if(adxl.triggered(interrupts, ADXL345_INACTIVITY)){
    
               Serial.flush();        
              adxl.InactivityINT(0);
              LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF);
  }
  
  // Activity
  if(adxl.triggered(interrupts, ADXL345_ACTIVITY)){
    Serial.println("*** ACTIVITY ***"); 
     
     adxl.InactivityINT(1);
     //add code here to do when activity is sensed
  }
  
  // Double Tap Detection
  if(adxl.triggered(interrupts, ADXL345_DOUBLE_TAP)){
    Serial.println("*** DOUBLE TAP ***");
     adxl.InactivityINT(1);
     //add code here to do when a 2X tap is sensed
  }
  
  // Tap Detection
  if(adxl.triggered(interrupts, ADXL345_SINGLE_TAP)){
    Serial.println("*** TAP ***");
    adxl.InactivityINT(1);
  } 
}

void blink() { 
}