Tuesday, April 15, 2014
The program of LEDs and Accelerator
In this week, our group made a monitor by using LEDs to react the change of accelerator.
Now, we will show and explain how this program work.
const int groundpin = 18; // analog input pin 4 -- ground
const int powerpin = 19; // analog input pin 5 -- voltage
const int xpin = A0; // x-axis of the accelerometer
const int ypin = A1; // y-axis
const int zpin = A2; // z-axis (only on 3-axis models)
int ledx=13; // the pin of x-axis LED
int ledy=10; // the pin of y-axis LED
int ledz=4; // the pin of z-axis LED
void setup()
{
// initialize the serial communications:
Serial.begin(9600); // set the data rate in bits per second
//initialize the digital pin as an output.
digitalWrite(groundpin, LOW);
digitalWrite(powerpin, HIGH);
pinMode(ledx, OUTPUT);
pinMode(ledy,OUTPUT);
pinMode(ledz,OUTPUT);
}
void loop()
{
// set the initial value of accelerator
int ax = analogRead(xpin); // the initial value of x-axis
int ay = analogRead(ypin); // the initial value of y-axis
int az = analogRead(zpin); // the initial value of z-axis
while (true) // loop, tracking and reacting the change
{
int Tax = analogRead(xpin); // reading the x-axis value after changing
// determining the changing margin of x-axis' value
// if value change bigger than 50, the LED will blink
// if not, it will closs
if (abs(Tax - ax) > 50)
{
digitalWrite(ledx, HIGH);
}
else
{
digitalWrite(ledx, LOW);
}
int Tay = analogRead(ypin);
if (abs(Tay - ay) > 50)
{
digitalWrite(ledy, HIGH);
}
else
{
digitalWrite(ledy, LOW);
}
int Taz = analogRead(zpin);
if (abs(Taz - az) > 50)
{
digitalWrite(ledz, HIGH);
}
else
{
digitalWrite(ledz, LOW);
}
}
// delay before next reading:
delay(100);
}
