MSP430 + PIR Motion sensor HC-S501 + Relay Module + Beeper

28/11/2014 admin Gadgets, News

A simple alarm system on MSP430 Launchpad based on http://blog.suspended-chord.info/2010/09/12/connecting-a-parallax-pir-sensor-module-to-the-launchpad/.

Code for Energia:

int calibrationTime = 30;

//the time when the sensor outputs a low impulse
long unsigned int lowIn;

//the amount of milliseconds the sensor has to be low
//before we assume all motion has stopped
long unsigned int pause = 5000;

boolean lockLow = true;
boolean takeLowTime;

int pirPin = A5;    //the digital pin connected to the PIR sensor’s output
int ledPin = 13;
int spkPin = 12;
int relPin = 11;

/////////////////////////////
//SETUP
void setup(){
//  Serial.begin(9600);
pinMode(pirPin, INPUT);
pinMode(ledPin, OUTPUT);
pinMode(spkPin, OUTPUT);
pinMode(relPin, OUTPUT);
digitalWrite(pirPin, LOW);

//give the sensor some time to calibrate
//  Serial.print(“calibrating sensor “);
for(int i = 0; i < calibrationTime; i++){
//      Serial.print(“.”);
delay(1000);
}
//    Serial.println(” done”);
//    Serial.println(“SENSOR ACTIVE”);
delay(50);
}

////////////////////////////
//LOOP
void loop(){

if(digitalRead(pirPin) == HIGH){
digitalWrite(ledPin, HIGH);   //the led visualizes the sensors output pin state
digitalWrite(spkPin, HIGH);
digitalWrite(relPin, LOW);
if(lockLow){
//makes sure we wait for a transition to LOW before any further output is made:
lockLow = false;
//         Serial.println(“—“);
//         Serial.print(“motion detected at “);
//         Serial.print(millis()/1000);
//         Serial.println(” sec”);
delay(50);
}
takeLowTime = true;
}

if(digitalRead(pirPin) == LOW){
digitalWrite(ledPin, LOW);  //the led visualizes the sensors output pin state
digitalWrite(spkPin, LOW);
digitalWrite(relPin, HIGH);
if(takeLowTime){
lowIn = millis();          //save the time of the transition from high to LOW
takeLowTime = false;       //make sure this is only done at the start of a LOW phase
}
//if the sensor is low for more than the given pause,
//we assume that no more motion is going to happen
if(!lockLow && millis() – lowIn > pause){
//makes sure this block of code is only executed again after
//a new motion sequence has been detected
lockLow = true;
//          Serial.print(“motion ended at “);      //output
//          Serial.print((millis() – pause)/1000);
//          Serial.println(” sec”);
delay(50);
}
}
}

The result on the maket plate:

The system will turn on the light before a door and make sound in the another room as an alert.

 

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