Hello,
I am trying to use an axis module as a sensor for an alarm (movement detection). When the values (z,x,y) change it triggers a relay.
Here is my code to check it. I use "calibration" function in order to set the "Starting" position and min max limits. If the relay triggers (it detects some movement) it must calibrate again in order to check if the movement was momentary or permanent. The problem with my code is that after the first trigger the relay keeps triggering....
PS sorry if my code is not very good but I am a newbie. 
#include <HMC5883L.h>
#include <Wire.h>
HMC5883L compass;
const int anoigma = 2;
const int kleisimo = 3;
const int buzzPin = 12;
int buttonState = 0;
int buttonState1 = 0;
int onState = 0;
int offState = 0;
int tiltval;
int relay = 5;
int relaytimer;
//Accelerometer limits
int xMin; //Minimum x Value
int xMax; //Maximum x Value
int xCal; //Calibrated x Value
int xCur; //Current x Value
int yMin; //Minimum y Value
int yMax; //Maximum y Value
int yCal; //Calibrated x Value
int yCur; //Current x Value
int zMin; //Minimum z Value
int zMax; //Maximum z Value
int zCal; //Calibrated x Value
int zCur; //Current x Value
int tolerance = 40;
const int ledPin = 13;
int ledState = LOW;
unsigned long previousMillis = 0;
const long interval = 1000;
void setup() {
pinMode(buzzPin, OUTPUT);
pinMode(anoigma, INPUT);
pinMode(relay, OUTPUT);
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
}
void loop() {
digitalWrite(relay, HIGH);
buttonState = digitalRead(anoigma);
if (buttonState == HIGH) {
calibration ();
digitalWrite(buzzPin, HIGH);
delay(50);
digitalWrite(buzzPin, LOW);
delay(50);
digitalWrite(buzzPin, HIGH);
delay(50);
digitalWrite(buzzPin, LOW);
delay(50);
digitalWrite(buzzPin, HIGH);
delay(50);
digitalWrite(buzzPin, LOW);
delay(600);
digitalWrite(buzzPin, HIGH);
delay(50);
digitalWrite(buzzPin, LOW);
Serial.println("anoikse");
onState = 1;
do
{
unsigned long currentMillis = millis();
if (currentMillis - previousMillis >= interval) {
// save the last time you blinked the LED
previousMillis = currentMillis;
// if the LED is off turn it on and vice-versa:
if (ledState == LOW) {
ledState = HIGH;
} else {
ledState = LOW;
}
// set the LED with the ledState of the variable:
digitalWrite(ledPin, ledState);
}
// Serial.println("trexei while");
Vector raw = compass.readRaw();
xCur = raw.XAxis;
yCur = raw.YAxis;
zCur = raw.ZAxis;
if (xCur > xMax || xCur < xMin || yCur > yMax || yCur < yMin || zCur > zMax || zCur < zMin)
{
Serial.println("tsoup");
relaytimer = 0;
alarm();
}
buttonState1 = digitalRead(kleisimo);
if (buttonState1 == HIGH) {
onState = 0;
}
} while (onState == 1);
digitalWrite(buzzPin, HIGH);
delay(50);
digitalWrite(buzzPin, LOW);
delay(50);
digitalWrite(buzzPin, HIGH);
delay(50);
digitalWrite(buzzPin, LOW);
delay(50);
digitalWrite(buzzPin, HIGH);
delay(50);
digitalWrite(buzzPin, LOW);
digitalWrite(ledPin, LOW);
Serial.println("ekleise");
}
}
void alarm()
{
while (offState == 0) {
digitalWrite(relay, LOW);
buttonState1 = digitalRead(kleisimo);
relaytimer++;
//Serial.println(relaytimer);
delay (10);
if (buttonState1 == HIGH) {
offState = 1;
}
if (relaytimer > 1000) {
offState = 1;
}
}
digitalWrite(relay, HIGH);
offState = 0;
calibration ();
}
void calibration ()
{
//calibration
Vector raw = compass.readRaw();
Serial.print(" Xraw = ");
Serial.print(raw.XAxis);
xCal = raw.XAxis;
xMin = (xCal - tolerance);
xMax = (xCal + tolerance);
Serial.print(" xMin = ");
Serial.print(xMin);
Serial.println(" xMax = ");
Serial.print(xMax);
Serial.println("\n");
Serial.print(" Yraw = ");
Serial.print(raw.YAxis);
yCal = raw.YAxis;
yMin = (yCal - tolerance);
yMax = (yCal + tolerance);
Serial.print(" yMin = ");
Serial.print(yMin);
Serial.print(" yMax = ");
Serial.print(yMax);
Serial.println("\n");
Serial.print(" Zraw = ");
Serial.print(raw.ZAxis);
zCal = raw.ZAxis;
zMin = (zCal - tolerance);
zMax = (zCal + tolerance);
Serial.print(" zMin = ");
Serial.print(zMin);
Serial.print(" zMax = ");
Serial.print(zMax);
Serial.println("\n");
}