{"id":644,"date":"2014-11-28T11:41:44","date_gmt":"2014-11-28T09:41:44","guid":{"rendered":"http:\/\/dety.net.ua\/?p=644"},"modified":"2014-11-28T11:42:10","modified_gmt":"2014-11-28T09:42:10","slug":"msp430-pir-motion-sensor-hc-s501-relay-module-beeper","status":"publish","type":"post","link":"https:\/\/dety.net.ua\/?p=644","title":{"rendered":"MSP430 + PIR Motion sensor HC-S501 + Relay Module + Beeper"},"content":{"rendered":"

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\/<\/a>.<\/p>\n

Code for Energia:<\/p>\n

int calibrationTime = 30;<\/p>\n

\/\/the time when the sensor outputs a low impulse
\nlong unsigned int lowIn;<\/p>\n

\/\/the amount of milliseconds the sensor has to be low
\n\/\/before we assume all motion has stopped
\nlong unsigned int pause = 5000;<\/p>\n

boolean lockLow = true;
\nboolean takeLowTime;<\/p>\n

int pirPin = A5;\u00a0\u00a0\u00a0 \/\/the digital pin connected to the PIR sensor’s output
\nint ledPin = 13;
\nint spkPin = 12;
\nint relPin = 11;<\/p>\n

\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
\n\/\/SETUP
\nvoid setup(){
\n\/\/\u00a0 Serial.begin(9600);
\npinMode(pirPin, INPUT);
\npinMode(ledPin, OUTPUT);
\npinMode(spkPin, OUTPUT);
\npinMode(relPin, OUTPUT);
\ndigitalWrite(pirPin, LOW);<\/p>\n

\/\/give the sensor some time to calibrate
\n\/\/\u00a0 Serial.print(“calibrating sensor “);
\nfor(int i = 0; i < calibrationTime; i++){
\n\/\/\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print(“.”);
\ndelay(1000);
\n}
\n\/\/\u00a0\u00a0\u00a0 Serial.println(” done”);
\n\/\/\u00a0\u00a0\u00a0 Serial.println(“SENSOR ACTIVE”);
\ndelay(50);
\n}<\/p>\n

\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/
\n\/\/LOOP
\nvoid loop(){<\/p>\n

if(digitalRead(pirPin) == HIGH){
\ndigitalWrite(ledPin, HIGH);\u00a0\u00a0 \/\/the led visualizes the sensors output pin state
\ndigitalWrite(spkPin, HIGH);
\ndigitalWrite(relPin, LOW);
\nif(lockLow){
\n\/\/makes sure we wait for a transition to LOW before any further output is made:
\nlockLow = false;
\n\/\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.println(“—“);
\n\/\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print(“motion detected at “);
\n\/\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print(millis()\/1000);
\n\/\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.println(” sec”);
\ndelay(50);
\n}
\ntakeLowTime = true;
\n}<\/p>\n

if(digitalRead(pirPin) == LOW){
\ndigitalWrite(ledPin, LOW);\u00a0 \/\/the led visualizes the sensors output pin state
\ndigitalWrite(spkPin, LOW);
\ndigitalWrite(relPin, HIGH);
\nif(takeLowTime){
\nlowIn = millis();\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/save the time of the transition from high to LOW
\ntakeLowTime = false;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/make sure this is only done at the start of a LOW phase
\n}
\n\/\/if the sensor is low for more than the given pause,
\n\/\/we assume that no more motion is going to happen
\nif(!lockLow && millis() – lowIn > pause){
\n\/\/makes sure this block of code is only executed again after
\n\/\/a new motion sequence has been detected
\nlockLow = true;
\n\/\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print(“motion ended at “);\u00a0\u00a0\u00a0\u00a0\u00a0 \/\/output
\n\/\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.print((millis() – pause)\/1000);
\n\/\/\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Serial.println(” sec”);
\ndelay(50);
\n}
\n}
\n}<\/p><\/blockquote>\n

The result on the maket plate:<\/p>\n

\"IMG_20141128_113146\"<\/a>The system will turn on the light before a door and make sound in the another room as an alert.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,13],"tags":[],"class_list":["post-644","post","type-post","status-publish","format-standard","hentry","category-gadgets","category-novosti"],"_links":{"self":[{"href":"https:\/\/dety.net.ua\/index.php?rest_route=\/wp\/v2\/posts\/644","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dety.net.ua\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dety.net.ua\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dety.net.ua\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dety.net.ua\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=644"}],"version-history":[{"count":2,"href":"https:\/\/dety.net.ua\/index.php?rest_route=\/wp\/v2\/posts\/644\/revisions"}],"predecessor-version":[{"id":647,"href":"https:\/\/dety.net.ua\/index.php?rest_route=\/wp\/v2\/posts\/644\/revisions\/647"}],"wp:attachment":[{"href":"https:\/\/dety.net.ua\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=644"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dety.net.ua\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=644"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dety.net.ua\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=644"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}