accel.h

#include <Adafruit_Sensor.h>
#include <Adafruit_ADXL345_U.h>
Adafruit_ADXL345_Unified accel = Adafruit_ADXL345_Unified(12345);

#define ACCEL_IRQPIN 25
unsigned long accelLastHit = 0;
unsigned long accelLastHitReal = 0;

bool accelInAlert = false;

bool AccelIsInAlert()
{
  return accelInAlert;
}

void IRAM_ATTR  AccelMotion()
{
  accelLastHit = millis();
  accelLastHitReal = accelLastHit;
  accelInAlert = true;
  wakeUpByTimer = false;
}

bool AccelTimeOuted()
{
  unsigned long current = millis();
  return ( (current - accelLastHit)> (60000 * STUFFON) );
}

int AccelLastHitSec()
{
   unsigned long current = millis();
  return ( (current - accelLastHit) /  1000);
}

void AccelResetEvent()
{
    accel.readRegister(0x30);
    accelInAlert = false;
}


bool InitAccel()
{
  accelLastHit = millis();//fake to get 5 minutes of work
  pinMode(ACCEL_IRQPIN, INPUT);   
  
  if(!accel.begin())
  {
    Serial.println("Ooops, no ADXL345 detected ... Check your wiring!");
    return false;
  }
  //accel.setRange(ADXL345_RANGE_16_G);  // accel.setRange(ADXL345_RANGE_8_G);  // accel.setRange(ADXL345_RANGE_4_G);  //accel.setRange(ADXL345_RANGE_2_G);
  accel.setRange(ADXL345_RANGE_4_G);
  accel.writeRegister(0x31, 0b00000001); //int invert, range
  accel.writeRegister(0x2d, 0b00001001); //0x2D—POWER_CTL
  accel.writeRegister(0x27, 0b11100000); //0x27—ACT_INACT_CTL
  accel.writeRegister(0x24,2); //THRESH_ACT
  accel.writeRegister(0x25, 1); //0x25—THRESH_INACT
  accel.writeRegister(0x2f, 0); //INT_MAP
  accel.writeRegister(0x2e, 16); //INT_ENABLE

  AccelResetEvent();//initial reset events
  attachInterrupt(digitalPinToInterrupt(ACCEL_IRQPIN), AccelMotion, RISING);
  return true;
}



void DebugAccel()
{
  sensors_event_t event; 
  accel.getEvent(&event);
  SerialMon.print("X: "); SerialMon.print(event.acceleration.x); SerialMon.print("  ");
  SerialMon.print("Y: "); SerialMon.print(event.acceleration.y); SerialMon.print("  ");
  SerialMon.print("Z: "); SerialMon.print(event.acceleration.z); SerialMon.print("  ");SerialMon.print("m/s^2 "); 
  int x = analogRead(35);
  SerialMon.print("   Analog: ");+
  SerialMon.println(x);
  if (AccelIsInAlert()) Serial.println(" ALERT"); else Serial.println("No alert");
}