Interfacing Accelerometer ADXL345 (GY-291) with Arduino UNO/ Mega

Interfacing Accelerometer ADXL345 (GY-291) with Arduino UNO/ Mega

Accelerometer ADXL345 is a 3-dimensional accelerometer, that measures acceleration in 3 dimensions X, Y and Z axis.

Connection Diagram:

To Interface ADXL345 Accelerometer with Arduino UNO:

To Interface ADXL345 Accelerometer with Arduino Mega:

ADXL345 Library Installation on Arduino:

Search for “ADXL345”, then Select and Install “Adafruit ADXL345”

After that search for “Adafruit unified Sensor” Library and select and Install it.

Arduino Program:

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_ADXL345_U.h>
/* Assign a unique ID to this sensor at the same time */
Adafruit_ADXL345_Unified accel = Adafruit_ADXL345_Unified(12345);

void displaySensorDetails(void)
{
sensor_t sensor;
accel.getSensor(&sensor);
Serial.println("------------------------------------");
Serial.print ("Sensor: "); Serial.println(sensor.name);
Serial.print ("Driver Ver: "); Serial.println(sensor.version);
Serial.print ("Unique ID: "); Serial.println(sensor.sensor_id);
Serial.print ("Max Value: "); Serial.print(sensor.max_value); Serial.println(" m/s^2");
Serial.print ("Min Value: "); Serial.print(sensor.min_value); Serial.println(" m/s^2");
Serial.print ("Resolution: "); Serial.print(sensor.resolution); Serial.println(" m/s^2"); 
Serial.println("------------------------------------");
Serial.println("");
delay(500);
}

void displayDataRate(void)
{
Serial.print ("Data Rate: ");

switch(accel.getDataRate())
{
case ADXL345_DATARATE_3200_HZ:
Serial.print ("3200 "); 
break;
case ADXL345_DATARATE_1600_HZ:
Serial.print ("1600 "); 
break;
case ADXL345_DATARATE_800_HZ:
Serial.print ("800 "); 
break;
case ADXL345_DATARATE_400_HZ:
Serial.print ("400 "); 
break;
case ADXL345_DATARATE_200_HZ:
Serial.print ("200 "); 
break;
case ADXL345_DATARATE_100_HZ:
Serial.print ("100 "); 
break;
case ADXL345_DATARATE_50_HZ:
Serial.print ("50 "); 
break;
case ADXL345_DATARATE_25_HZ:
Serial.print ("25 "); 
break;
case ADXL345_DATARATE_12_5_HZ:
Serial.print ("12.5 "); 
break;
case ADXL345_DATARATE_6_25HZ:
Serial.print ("6.25 "); 
break;
case ADXL345_DATARATE_3_13_HZ:
Serial.print ("3.13 "); 
break;
case ADXL345_DATARATE_1_56_HZ:
Serial.print ("1.56 "); 
break;
case ADXL345_DATARATE_0_78_HZ:
Serial.print ("0.78 "); 
break;
case ADXL345_DATARATE_0_39_HZ:
Serial.print ("0.39 "); 
break;
case ADXL345_DATARATE_0_20_HZ:
Serial.print ("0.20 "); 
break;
case ADXL345_DATARATE_0_10_HZ:
Serial.print ("0.10 "); 
break;
default:
Serial.print ("???? "); 
break;
} 
Serial.println(" Hz"); 
}

void displayRange(void)
{
Serial.print ("Range: +/- ");

switch(accel.getRange())
{
case ADXL345_RANGE_16_G:
Serial.print ("16 "); 
break;
case ADXL345_RANGE_8_G:
Serial.print ("8 "); 
break;
case ADXL345_RANGE_4_G:
Serial.print ("4 "); 
break;
case ADXL345_RANGE_2_G:
Serial.print ("2 "); 
break;
default:
Serial.print ("?? "); 
break;
} 
Serial.println(" g"); 
}

void setup(void) 
{
Serial.begin(9600);
Serial.println("Accelerometer Test"); Serial.println("");

/* 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);
// displaySetRange(ADXL345_RANGE_8_G);
// displaySetRange(ADXL345_RANGE_4_G);
// displaySetRange(ADXL345_RANGE_2_G);

/* Display some basic information on this sensor */
displaySensorDetails();

/* Display additional settings (outside the scope of sensor_t) */
displayDataRate();
displayRange();
Serial.println("");
}

void loop(void) 
{
/* Get a new sensor event */ 
sensors_event_t event; 
accel.getEvent(&event);

/* Display the results (acceleration is measured in m/s^2) */
Serial.print("X: "); Serial.print(event.acceleration.x); Serial.print(" ");
Serial.print("Y: "); Serial.print(event.acceleration.y); Serial.print(" ");
Serial.print("Z: "); Serial.print(event.acceleration.z); Serial.print(" ");Serial.println("m/s^2 ");
delay(500);
}

Results:

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