/*
Voltaat learn (http://learn.voltaat.com)
Link for full tutorial:https://learn.voltaat.com/2023/05/03/measure-and-detect-the-co2-concentration-using-the-arduino-%f0%9f%8f%ad/

Tutorial: Make a Clap Switch with Arduino and Sound Sensor!

The purpose of this sketch is to turn the LED on and off when a clap is detected by the microphone module.

Connections from the Arduino to the breadboard:

• Arduino GND pin → Breadboard ground line

• Arduino 5V pin → Breadboard 5V line



Connections from the Microphone Module :

• Microphone Module VCC pin → Breadboard 5V line

• Microphone Module GND pin → Breadboard ground line

• Microphone Module A0 pin → Arduino pin A0



Connections from the LED :

• LED anode pin → 330 ohm resistor first pin

• LED cathode pin → Breadboard ground line



Connections from the 330 ohm resistor:

• 330 ohm resistor first pin → LED anode pin

• 330 ohm resistor second pin → Arduino pin 3

*/

// Declare variable Sensor and assign it to A0 analog input pin
int Sensor = A0;

// Declare variables
int clap = 0;
long detection_range_start = 0;
long detection_range = 0;
boolean status_lights = false;

// Setup function that runs once at the beginning of the program
void setup() {
// Set Sensor pin as input and pin 3 as output
pinMode(Sensor, INPUT);
pinMode(3,OUTPUT);
}

// Loop function that runs repeatedly throughout the program
void loop() {
// Read the status of the Sensor pin and store it in status_sensor variable
int status_sensor = digitalRead(Sensor);

// If the Sensor pin is LOW (i.e. a clap is detected)
if (status_sensor == 0)
{
// If the clap count is 0 (i.e. first clap is detected)
if (clap == 0)
{
// Record the start time of the clap detection and increment clap count by 1
detection_range_start = detection_range = millis();
clap++;
}
// If the clap count is greater than 0 and the time elapsed since the last clap is more than 50ms
else if (clap > 0 && millis()-detection_range >= 50)
{
// Record the time of the clap detection and increment clap count by 1
detection_range = millis();
clap++;
}
}

// If the time elapsed since the first clap is more than 400ms
if (millis()-detection_range_start >= 400)
{
// If two claps were detected
if (clap == 2)
{
// If the lights are currently off
if (!status_lights)
{
// Turn the lights on and set the status_lights variable to true
status_lights = true;
digitalWrite(3, HIGH);
}
// If the lights are currently on
else if (status_lights)
{
// Turn the lights off and set the status_lights variable to false
status_lights = false;
digitalWrite(3, LOW);
}
}
// Reset the clap count to 0
clap = 0;
}
}