Hi guys
I am trying to get my atmega328p (bare bones arduino) to wake from sleep using an interrupt generated from the ADXL345. I can read all the values from the chip over the I2C bus, but cannot get it to generate an interrupt out of "INT1".
Chip datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADXL345.pdf
Library: GitHub - Seeed-Studio/Accelerometer_ADXL345: Seeed 3-Axis Digital Accelerometer library
Can anyone see what I am doing wrong?
My code is as follows
// **** INCLUDES *****
#include "LowPower.h"
#include <avr/wdt.h>
#include "Wire.h"
#include <ADXL345.h>
const int manualwakeuppin = 3;
ADXL345 adxl; //variable adxl is an instance of the ADXL345 library
void wakeUp()
{
// Just a handler for the pin interrupt.
}
void setup()
{
wdt_enable(WDTO_8S);
setupIO();
Wire.begin();
Serial.begin(9600);delay(1000);
Serial.println("BEGIN CODE OR LOCKED UP"); delay(1000);
setupaccelerometer();
}
void loop()
{
wdt_reset();
wdt_disable();
Serial.println("GOING TO SLEEP"); delay(1000);
attachInterrupt(digitalPinToInterrupt(manualwakeuppin), wakeUp, CHANGE);
LowPower.powerDown(SLEEP_FOREVER, ADC_OFF, BOD_OFF);
wdt_enable(WDTO_8S);
detachInterrupt(digitalPinToInterrupt(manualwakeuppin));
//interrupt test
if (digitalRead(manualwakeuppin) == HIGH) {
Serial.print("Accelerometer wake up at "); delay(1000);
}
wdt_reset();
printacceldata();
}
//accelerometer functions
void printacceldata(){
//Boring accelerometer stuff
int x,y,z;
adxl.readXYZ(&x, &y, &z); //read the accelerometer values and store them in variables x,y,z
// Output x,y,z values
Serial.print("values of X , Y , Z: ");
Serial.print(x);
Serial.print(" , ");
Serial.print(y);
Serial.print(" , ");
Serial.println(z);
double xyz[3];
double ax,ay,az;
adxl.getAcceleration(xyz);
ax = xyz[0];
ay = xyz[1];
az = xyz[2];
Serial.print("X=");
Serial.print(ax);
Serial.println(" g");
Serial.print("Y=");
Serial.print(ay);
Serial.println(" g");
Serial.print("Z=");
Serial.print(az);
Serial.println(" g");
Serial.println("**********************");
delay(500);
}
void setupaccelerometer() {
adxl.powerOn();
//set activity/ inactivity thresholds (0-255)
adxl.setActivityThreshold(75); //62.5mg per increment
adxl.setInactivityThreshold(75); //62.5mg per increment
adxl.setTimeInactivity(10); // how many seconds of no activity is inactive?
//look of activity movement on this axes - 1 == on; 0 == off
adxl.setActivityX(1);
adxl.setActivityY(1);
adxl.setActivityZ(1);
//look of inactivity movement on this axes - 1 == on; 0 == off
adxl.setInactivityX(1);
adxl.setInactivityY(1);
adxl.setInactivityZ(1);
//look of tap movement on this axes - 1 == on; 0 == off
adxl.setTapDetectionOnX(1);
adxl.setTapDetectionOnY(1);
adxl.setTapDetectionOnZ(1);
//set values for what is a tap, and what is a double tap (0-255)
adxl.setTapThreshold(50); //62.5mg per increment
adxl.setTapDuration(15); //625us per increment
adxl.setDoubleTapLatency(80); //1.25ms per increment
adxl.setDoubleTapWindow(200); //1.25ms per increment
//set values for what is considered freefall (0-255)
adxl.setFreeFallThreshold(7); //(5 - 9) recommended - 62.5mg per increment
adxl.setFreeFallDuration(45); //(20 - 70) recommended - 5ms per increment
//setting all interrupts to take place on int pin 1
//I had issues with int pin 2, was unable to reset it
adxl.setInterruptMapping( ADXL345_INT_SINGLE_TAP_BIT, ADXL345_INT1_PIN );
adxl.setInterruptMapping( ADXL345_INT_DOUBLE_TAP_BIT, ADXL345_INT1_PIN );
adxl.setInterruptMapping( ADXL345_INT_FREE_FALL_BIT, ADXL345_INT1_PIN );
adxl.setInterruptMapping( ADXL345_INT_ACTIVITY_BIT, ADXL345_INT1_PIN );
adxl.setInterruptMapping( ADXL345_INT_INACTIVITY_BIT, ADXL345_INT1_PIN );
//register interrupt actions - 1 == on; 0 == off
adxl.setInterrupt( ADXL345_INT_SINGLE_TAP_BIT, 1);
adxl.setInterrupt( ADXL345_INT_DOUBLE_TAP_BIT, 1);
adxl.setInterrupt( ADXL345_INT_FREE_FALL_BIT, 1);
adxl.setInterrupt( ADXL345_INT_ACTIVITY_BIT, 1);
adxl.setInterrupt( ADXL345_INT_INACTIVITY_BIT, 1);
}
void setupIO(){
pinMode(manualwakeuppin, INPUT);
pinMode(2, INPUT_PULLUP);
pinMode(4, INPUT_PULLUP);
pinMode(5, INPUT_PULLUP);
pinMode(6, INPUT_PULLUP);
pinMode(7, INPUT_PULLUP);
pinMode(8, INPUT_PULLUP);
pinMode(9, INPUT_PULLUP);
pinMode(12, INPUT_PULLUP);
pinMode(13, INPUT_PULLUP);
pinMode(A1, INPUT_PULLUP);
pinMode(A2, INPUT_PULLUP);
pinMode(A3, INPUT_PULLUP);
pinMode(A4, INPUT_PULLUP);
pinMode(A5, INPUT_PULLUP);
}
