Sound Location Finder

1/*
2 File/Sketch Name: SoundLocator
3
4 Version No.: v1.0 Created  8 September, 2019
5 
6 Original Author: Clyde A. Lettsome, PhD, PE, MEM
7  
8 Description:  This code/sketch makes finding the general direction of sound  easy. This code/sketch is for a sound location finder using two microphone sensors
9  in conjunction with an Arduino Uno. The code/sketch polls two microphone sensors  in a sound location finder circuit. If sound is detected in one microphone sensor  and not the
10 other, the Arduino request a stepper motor in the circuit to turn  the sound detection board in the direction of the sound. If the sound is detected  in both microphones or no
11 sound is detected, the circuit does nothing and continues  to poll the microphone sensors.
12
13 License: This program is free software;  you can redistribute it and/or modify it under the terms of the GNU General Public  License (GPL) version 3, or any later
14 version of your choice, as published by  the Free Software Foundation.
15
16 Notes: Copyright (c) 2019 by C. A. Lettsome  Services, LLC
17 For more information visit https://clydelettsome.com/blog/2019/09/08/my-weekend-project-sound-location-finder/
18
19  */
20const int stepsPerRevolution = 400;  // change this to fit the number of steps  per revolution for your motor
21const int numberOfSteps = stepsPerRevolution/8;  //45 degree turns
22const int dirPin=12; 
23const int stepPin=13;
24const int  rightSensorPin=7;
25const int leftSensorPin=8;
26const int enablePin=5 ;
27boolean  rightVal = 0;
28boolean leftVal = 0;
29
30void setup()
31{
32  pinMode(leftSensorPin,  INPUT); //Make pin 8 an input pin.
33  pinMode(rightSensorPin, INPUT); //Make pin  7 an input pin.
34  pinMode (stepPin, OUTPUT); //Make pin 13 an output pin.
35  pinMode (dirPin, OUTPUT); //Make pin 12 an output pin.
36  pinMode (enablePin,  OUTPUT); //Make pin 5 an output pin.
37
38  digitalWrite(enablePin, LOW); //Enable  is active low
39  Serial.begin (9600); // initialize the serial port:
40}
41  
42void loop ()
43{
44  //poll inputs for signal
45  rightVal =digitalRead(rightSensorPin);
46  leftVal =digitalRead(leftSensorPin);
47  
48  // when the sensor detects a signal  above the threshold value set on sensor, turn finder to the direction of sound
49  if (leftVal==LOW && rightVal==HIGH)
50  {
51    Serial.println("Turning Right");
52    digitalWrite(dirPin,LOW); //turn counter-clockwise
53    
54    //turn finder  in the direction of the sound
55    for(int steps = 0; steps < numberOfSteps; steps++)
56    {
57      //create pulse to turn motor one step at a time
58      digitalWrite(stepPin,HIGH);
59      delayMicroseconds(10000);
60      digitalWrite(stepPin, LOW);
61      delayMicroseconds(10000);
62    }
63    delayMicroseconds(100000);
64    rightVal = 0;
65    leftVal = 0;
66  }
67  else if (leftVal==HIGH && rightVal==LOW)
68  {
69    Serial.println("Turning  Left");
70    digitalWrite(dirPin,HIGH); //turn clockwise
71      
72    //turn  finder in the direction of the sound
73    for(int steps = 0; steps < numberOfSteps;  steps++)
74    {
75      //create pulse to turn motor one step at a time
76      digitalWrite(stepPin,HIGH);
77      delayMicroseconds(10000);
78      digitalWrite(stepPin, LOW);
79      delayMicroseconds(10000);
80    }
81    delayMicroseconds(100000);
82    rightVal = 0;
83    leftVal = 0;
84  }
85  else 
86  {
87    //Do nothing
88    rightVal = 0;
89    leftVal =  0;
90  }
91}
92
93