Discussion in 'Programmer's Corner' started by neo1111, Jan 11, 2015.

1. ### neo1111 Thread Starter New Member

Jan 11, 2014
28
1
Hi there!
I want to make a program that reads the movement on X and Y axis and turns a LED on.
For mevement on X axis-turn on Red led and for movement on Y axis-turn on Yellow led.
For the X axis it's ok but i can't find what's wrong for the Y axis.
For the x axis , the program works practically but not for the Y axis.

//program
#define PRAG_X_1 0.5
#define PRAG_X_2 1
#define PRAG_X_3 2
#define PRAG_Y_1 0.5
#define PRAG_Y_2 1
#define PRAG_Y_3 2
//X and Y are the axis of the accelerometer; +/- 3 g it can detect; 0,5/1/2 are the steps
#define SMOOTH_X 0.4
#define SMOOTH_Y 0.4 //this is a filtering that the eye can detect the difference
void setup(){
pinMode(2, OUTPUT);
pinMode(8, OUTPUT);
pinMode(13, OUTPUT); //prin 2,8,13 as outputs
digitalWrite(2, HIGH); // this pin will stay on -reprezenting the z axis
} ]

float oldAccX;
float oldAccY;
void loop() {
float accX = smooth(readAcc(0), SMOOTH_X, oldAccX); //reads 2 measurements :x , y axis
float accY = smooth(readAcc(1), SMOOTH_Y, oldAccY);
if (accX < -PRAG_X_2){
digitalWrite(13, HIGH);
}
else {
digitalWrite(13, LOW);
}
if (accY < -PRAG_Y_2){
digitalWrite(8, HIGH);
}
else {
digitalWrite(8, LOW);
}
}
int miliVolts=map(value,0,,1023,0,3300)-3300/2; // transforms readed value in mV
float acc=(float)miliVolts/360; //adxl generates a 360mV/g
return acc; //returns that value of the acceleration
float smooth(float data, float filterVal, float smoothedVal) {
if (filterVal > 1) {
filterVal = .99;
}
else if (filterVal <= 0){
filterVal = 0; //the bandwich is 100 MHz
}
smoothedVal = (data * (1 - filterVal)) + (smoothedVal * filterVal);
return (float)smoothedVal;
}
ll
The pictures are meant to illustrate that it's functionating for the x axis but not for the y axis.

I wanna know what i must change in the if line for the 8 pin in order to turn a led on when it detects acceleration . I made myself some modifications but i wasn't succesful in my matter .

2. ### neo1111 Thread Starter New Member

Jan 11, 2014
28
1
Problem solved.

3. ### djsfantasi AAC Fanatic!

Apr 11, 2010
2,809
834
And could you share how?