I would like the sensor values to be updated each 10ms(100Hz) and then run the algorithm and repeat the same process. However, after timing the algorithm it is taking only 2ms, I think the data_ready interrupt is not working as expected. Physical hardware connection is from INT1 of ADXL345 to pin2 of the UNO.
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_ADXL345_U.h>
#include <avr/io.h>
#include <avr/power.h>
#define F_CPU 16000000UL
volatile int sensor_update=0;
//----------------------------------------------------------------------------------------------
//Write to ADXL345 registers
void writeTo(int device, byte address, byte val) {
Wire.beginTransmission(device); //start transmission to device
Wire.write(address); // send register address
Wire.write(val); // send value to write
Wire.endTransmission(); //end transmission
}
//----------------------------------------------------------------------------------------------
/////////////////////////////////////////////////////////////////////////////////////////////
//ISR function
void interrupt(void){
sensor_update=1;
}
//////////////////////////////////////////////////////////////////////////////////////////////////
void buzz(int targetPin, long frequency, long length) {
long delayValue = 1000000/frequency/2; // calculate the delay value between transitions
//// 1 second's worth of microseconds, divided by the frequency, then split in half since
//// there are two phases to each cycle
long numCycles = frequency * length/ 1000; // calculate the number of cycles for proper timing
//// multiply frequency, which is really cycles per second, by the number of seconds to
//// get the total number of cycles to produce
for (long i=0; i < numCycles; i++){ // for the calculated length of time...
digitalWrite(targetPin,HIGH); // write the buzzer pin high to push out the diaphram
delayMicroseconds(delayValue); // wait for the calculated delay value
digitalWrite(targetPin,LOW); // write the buzzer pin low to pull back the diaphram
delayMicroseconds(delayValue); // wait againf or the calculated delay value
}
}
/* Assign a unique ID to this sensor at the same time */
Adafruit_ADXL345_Unified accel = Adafruit_ADXL345_Unified(12345);
void setup(void)
{
if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
Serial.begin(9600);
//Serial.println("Accelerometer Test"); Serial.println("");
pinMode(4, OUTPUT);// buzzer output pin
/* Initialise the sensor */
if(!accel.begin())
{
/* There was a problem detecting the ADXL345 ... check your connections */
//Serial.println("Ooops, no ADXL345 detected ... Check your wiring!");
while(1);
}
/* Set the range to whatever is appropriate for your project */
accel.setRange(ADXL345_RANGE_16_G);
accel.setDataRate(ADXL345_DATARATE_100_HZ);
// displaySetRange(ADXL345_RANGE_8_G);
// displaySetRange(ADXL345_RANGE_4_G);
// displaySetRange(ADXL345_RANGE_2_G);
//Create an interrupt that will trigger when a tap is detected.
attachInterrupt(0, interrupt, RISING);
writeTo(0x1D, 0x2E, 0);
writeTo(0x1D, 0x2F, 0);
writeTo(0x1D, 0x2E, 128);
writeTo(0x1D, 0x2F, 127);
}
void loop(void)
{
if(sensor_update==1 ){
//When sensor_update is set to 1 in the ISR,the algorithm process the data from the accelerometer being updated every 10ms(100Hz)
sensor_update=0;//reset
}
}
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