Clap Light Project (X02)

About

This project uses the Microphone to detect clapping noises and turns on or off the LED if it senses two claps with a second pause inbetween. This project was designed for the second generation mCookie Maker kits (102 Basic, 202 Advanced and 302 Expert kits).

Required Materials

For 102 Basic Kit

• 1 x mCookie Core
• 1 x mCookie USB TTL
• 1 x mCookie Sensor Hub
• 1 x Single ColorLED
• 1 x Microphone Sensor
• 1 x Buzzer
• 3 x Sensor Cable
• 1 x MicroUSB Cable

Build

1. Connect the Single ColorLED to the Sensor Hub on Pin A0/A1
2. Connect the Buzzer to the Sensor Hub on Pin 6/7
3. Connect the Microphone to the Sensor Hub on Pin A2/A3
4. Grab the mCookie USBTTL and Stack the mCookie Core on top.
5. Stack the mCookie Sensor on top of that.
6. Plug in the MicroUSB cable to the mCookie USBTTL a computer.

Program

Copy and paste the code below and upload.

#include <Adafruit_NeoPixel.h>  //Import the library for the ColorLED.
#include <stdint.h>

#define MIC_PIN A2
#define BUZZER_PIN 6
#define LED_PIN A0

//The minimum amount of clap loudness to be registered as a clap
const uint16_t CLAP_LOUDNESS_THRESHOLD = 400;

//The maximum loudness between the two claps
const uint16_t SLIENT_LOUDNESS_THRESHOLD = 200;

volatile uint16_t mic_value;
unsigned long second_clap_timer;

bool leds_are_on = false;


void setup() {
  pinMode(LED_PIN, OUTPUT);
  
  Serial.begin(9600);
  // put your setup code here, to run once:
  pinMode(MIC_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:


  //Take in mic reading for the first clap
  uint16_t mic_value = analogRead(MIC_PIN);
  //Check if it is greater than the threadhold
  if ( mic_value > CLAP_LOUDNESS_THRESHOLD ) {
    Serial.println("First clap detected!");
    delay(1000); //Wait 500 milliseconds
    //Read in a new mic value for the silence between the claps
    mic_value = analogRead(mic_value);
    Serial.println(mic_value);
    //If the value is under the threshold, then it is slient
    if ( mic_value < SLIENT_LOUDNESS_THRESHOLD ) {
      Serial.println("Slience detected!");
      //wait a bit of time beforce looking for the second clap
      delay(1000);
      second_clap_timer = millis();
      while(((millis() - second_clap_timer) < 2000)){
        mic_value = analogRead(MIC_PIN);
        if(mic_value > CLAP_LOUDNESS_THRESHOLD){
          Serial.println("Second clap detected!");
          tone(BUZZER_PIN, 3038, 200);
          if( leds_are_on == false ){
            activate_light();
          }
          else{
            deactivate_light();
          }
          delay(1000);
          break;
        }
      }
      
    }
  }

  delay(1);
}

void activate_light() {
  digitalWrite(LED_PIN, HIGH);
  leds_are_on = true;
}

void deactivate_light() {
  digitalWrite(LED_PIN, LOW);
  leds_are_on = false;
  return;
}

Usage

Clap once, wait about 1-2 seconds, then clap another time. The LED should turn on. Repeating the sequence will turn off the LED.