ADXL345 가속도 센서를 이용한 기울어짐 상태 파악

<준비물>

ㅇ Arduino

ㅇ ADXL345 가속도 센서 모듈 

ㅇ 만능기판

ㅇ 점퍼 케이블

 

<연결>

• 5V
• GND
• SCL
• SDA

 

<Source Code>

/*******************************************************

Name: ADXL345_Example



******************************************************/

#include <Wire.h>

#include <ADXL345.h>



ADXL345 adxl; //variable adxl is an instance of the ADXL345 library



void setup(){

  Serial.begin(9600);

  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(0);

  adxl.setTapDetectionOnY(0);

  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); //625μs 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 interupts 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 interupt 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 loop(){

  //Boring accelerometer stuff   

  int x,y,z;  

  adxl.readAccel(&x, &y, &z); //read the accelerometer values and store them in variables  x,y,z



  // Output x,y,z values - Commented out

  Serial.print("X:");

  Serial.print(x);

  Serial.print(", Y:");

  Serial.print(y);

  Serial.print(", Z:");<<

  Serial.println(z);



  delay(1000);

  

}

 

 

<결과>

1. 그림과 동일한 상태

X:0, Y:0, Z:256

 

2. 오른쪽(짧은 선을 기준으로 ) 회전

X:0, Y;256, Z:0

 

3. (다시 1의 위치로 정한 다음) 앞쪽(긴 선을 기준으로) 회전

X:-256, Y:0, Z:0