My goal is to have a sound effect play when a person first walks into the field of view of my PIR. So far I can get it to work, but the sound “stutters” for about 4 seconds before it will play through all the way.
The parts that I am using are:
http://www.mdfly.com/products/microsd-tf-card-mp3-wav-player-module-ttl.html (datasheet: http://mdfly.oss-cn-hangzhou.aliyuncs.com/board%2Faudio%2FAU5017.pdf )
and an arduino uno
besides vcc and ground, my arduino’s pins connect pin7 to my mp3 board’s number 1 pin (which is active low) and also from my arduino’s pin3 to the out/signal from my PIR sensor.
I have tried a couple different example sketches and modified them to something that i thought would work, but they both have similar problems with “stuttering”. Below are the sketches after modification. (note: I haven’t finished changing some of the commenting yet.)
I would be very thankful for any and all help. I can admit, I’m not very good at this kind of thing. This project is for halloween in 2016. I’m so bad (and I realize it) that I’m starting a year in advance.
FIRST SKETCH:
// Uses a PIR sensor to detect movement, buzzes a buzzer
// more info here: http://blog.makezine.com/projects/pir-sensor-arduino-alarm/
// email me, John Park, at jp@jpixl.net
// based upon:
// PIR sensor tester by Limor Fried of Adafruit
// tone code by michael@thegrebs.com
int MP3Song1Pin = 7; // choose the pin for the mp3 board
int inputPin = 3; // choose the input pin (for PIR sensor)
int pirState = LOW; // we start, assuming no motion detected
int val = 0; // variable for reading the pin status
void setup() {
pinMode(MP3Song1Pin, OUTPUT); // declare mp3 board as output
pinMode(inputPin, INPUT); // declare sensor as input
Serial.begin(9600);
}
void loop(){
val = digitalRead(inputPin); // read input value
if (val == HIGH) { // check if the input is HIGH
digitalWrite(MP3Song1Pin, LOW); // turn mp3 board on
delay(10);
digitalWrite(MP3Song1Pin, HIGH); // turn mp3 board
if (pirState == LOW) {
// we have just turned on
Serial.println("Motion detected!");
// We only want to print on the output change, not state
pirState = HIGH;
}
} else {
digitalWrite(MP3Song1Pin, HIGH); // turn mp3 board OFF
if (pirState == HIGH){
// we have just turned off
Serial.println("Motion ended!");
// We only want to print on the output change, not state
pirState = LOW;
}
}
}
SECOND SKETCH:
/*
* //////////////////////////////////////////////////
* //making sense of the Parallax PIR sensor's output
* //////////////////////////////////////////////////
*
* Switches a LED according to the state of the sensors output pin.
* Determines the beginning and end of continuous motion sequences.
*
* @author: Kristian Gohlke / krigoo (_) gmail (_) com / http://krx.at
* @date: 3. September 2006
*
* kr1 (cleft) 2006
* released under a creative commons "Attribution-NonCommercial-ShareAlike 2.0" license
* http://creativecommons.org/licenses/by-nc-sa/2.0/de/
*
*
* The Parallax PIR Sensor is an easy to use digital infrared motion sensor module.
* (http://www.parallax.com/detail.asp?product_id=555-28027)
*
* The sensor's output pin goes to HIGH if motion is present.
* However, even if motion is present it goes to LOW from time to time,
* which might give the impression no motion is present.
* This program deals with this issue by ignoring LOW-phases shorter than a given time,
* assuming continuous motion is present during these phases.
*
*/
/////////////////////////////
//VARS
//the time we give the sensor to calibrate (10-60 secs according to the datasheet)
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 = 3; //the digital pin connected to the PIR sensor's output
int ledPin = 7;
/////////////////////////////
//SETUP
void setup(){
Serial.begin(9600);
pinMode(pirPin, INPUT);
pinMode(ledPin, 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, LOW); //the led visualizes the sensors output pin state
delay(50);
digitalWrite(ledPin, HIGH);
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, HIGH); //the led visualizes the sensors output pin state
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);
}
}
}
