Arduino Triple Axis Accelerometer ADXL345 Sensor Board Module

Arduino Triple Axis Accelerometer ADXL345 Sensor Board Module

Breakout board for the Analog Device ADXL345. The ADXL345 is a small, thin, low power, 3-axis accelerometer with high resolution (13-bit) measurement at up to ±16 g. Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4-wire) or I2C digital interface.

The ADXL345 is well suited to measures the static acceleration of gravity in tilt-sensing applications, as well as dynamic acceleration resulting from motion or shock. Its high resolution (4 mg/LSB) enables measurement of inclination changes less than 1.0°.

Several special sensing functions are provided. Activity and inactivity sensing detect the presence or lack of motion and if the acceleration on any axis exceeds a user-set level. Tap sensing detects single and double taps. Free-fall sensing detects if the device is falling. These functions can be mapped to one of two interrupt output pins. An integrated, patent pending 32-level first in, first out (FIFO) buffer can be used to store data to minimize host processor intervention. Low power modes enable intelligent motion-based power management with threshold sensing and active acceleration measurement at extremely low power dissipation.

Specifications:
- 2.0-3.6VDC Supply Voltage
- Ultra Low Power: 40uA in measurement mode, 0.1uA in standby@ 2.5V
- Tap/Double Tap Detection
- Free-Fall Detection
- SPI and I2C interfaces

Documents: DataSheet

Ardiono Simple Code:

//I2C (sparkfun breakout)
  #define Register_ID 0
  #define Register_2D 0x2D
  #define Register_X0 0x32
  #define Register_X1 0x33
  #define Register_Y0 0x34
  #define Register_Y1 0x35
  #define Register_Z0 0x36
  #define Register_Z1 0x37

  #include

  int ADXAddress = 0xA7 >> 1; // the default 7-bit slave address
  int reading = 0;
  int val=0;
  int X0,X1,X_out;
  int Y0,Y1,Y_out;
  int Z1,Z0,Z_out;
  double Xg,Yg,Zg;

void setup()
{
  Wire.begin();
  Serial.begin(19200);
  delay(100);
  // enable to measute g data
  Wire.beginTransmission(ADXAddress);
  Wire.send(Register_2D);
  Wire.send(8); //measuring enable
  Wire.endTransmission(); // stop transmitting
}

void loop()
{
//--------------X
  Wire.beginTransmission(ADXAddress); // transmit to device
   Wire.send(Register_X0);
  Wire.send(Register_X1);
  Wire.endTransmission();
   Wire.requestFrom(ADXAddress,2);
  if(Wire.available()<=2)
   {
    X0 = Wire.receive();
     X1 = Wire.receive();
     X1=X1<<8;
     X_out=X0+X1;
   }

//------------------Y
  Wire.beginTransmission(ADXAddress); // transmit to device
  Wire.send(Register_Y0);
  Wire.send(Register_Y1);
  Wire.endTransmission();
  Wire.requestFrom(ADXAddress,2);
   if(Wire.available()<=2)
  {
     Y0 = Wire.receive();
     Y1 = Wire.receive();
     Y1=Y1<<8;
     Y_out=Y0+Y1;
  }
  //------------------Z
   Wire.beginTransmission(ADXAddress); // transmit to device
   Wire.send(Register_Z0);
  Wire.send(Register_Z1);
   Wire.endTransmission();
   Wire.requestFrom(ADXAddress,2);
  if(Wire.available()<=2)
  {
    Z0 = Wire.receive();
    Z1 = Wire.receive();
    Z1=Z1<<8;
    Z_out=Z0+Z1;
  }
//
  Xg=X_out/256.0;
  Yg=Y_out/256.0;
  Zg=Z_out/256.0;
  Serial.print("X= ");
  Serial.print(Xg);
  Serial.print(" ");
   Serial.print("Y= ");
   Serial.print(Yg);
   Serial.print(" ");
  Serial.print("Z= ");
   Serial.print(Zg);
  Serial.println(" ");
  delay(200);
  }

Package Included:
- 1 x Triple Axis Accelerometer ADXL345 Module