Input tests (Blink)

Input test: accelerometer (model adxl335)

Wiring: use 3 short wires to connect X, Y, and Z to A0, A1, and A2 respectively.

use 2 more wires (measured to fit) to connect GND (accelerometer) to GND (arduino) and VCC to 3.3V.

Coding:

//Set pins

const int X_PIN = 0;

const int Y_PIN = 1;

const int Z_PIN = 2;

const int NUM_AXES= 3;

const int PINS[NUM_AXES]={X_PIN,Y_PIN,Z_PIN};

//Input comes really fast, so set a buffer for averaging values

const int BUFFER_SIZE=16;

int buffer[NUM_AXES][BUFFER_SIZE];

int buffer_pos[NUM_AXES]={0};

void setup()

{

Serial.begin(9600);

}

int get_axis(const int axis)

{

//Give arduino time to switch pins

delay(1);

//Read values into the buffer

buffer[axis][buffer_pos[axis]]=analogRead(PINS[axis]);

buffer_pos[axis]=(buffer_pos[axis]+1)%BUFFER_SIZE;

long sum=0;

//Average buffer values

for(int i=0;i

{

sum+=buffer[axis][i];

return round(sum/BUFFER_SIZE);

}

int get_x(){return get_axis(0);}

int get_y(){return get_axis(1);}

int get_z(){return get_axis(2);}

void loop()

{

//Print values

Serial.print("X: ");

Serial.print(get_x());

Serial.print("Y: ");

Serial.print(get_y());

Serial.print("Z: ");

Serial.println(get_z());

}

Tweaking:

Values from x and y axes are between ~8 and ~800 while z is between ~200-~750

Using these values, I need to set up a bit of code to detect when the unit is rotated along one of its axes within tolerances. The output should only read once after detecting this change.