Arduino-Based Pressure Cooker Whistle Indicator

Problem Statement

People with a hearing disability or busy housewives are sometimes unable to keep track of the how many times the pressure cooker has whistled. This Arduino-based device will assist them to overcome the problem.

Project Description

This is an Arduino-based project to help hearing disabled persons or housewives keep track of the pressure cooker's whistling. Whenever the cook is not around, this device will record the number of times the pressure cooker whistles using a sound sensor. And whenever that number matches with predefined number, this device will start beeping thus alerting the user.

Hardware Parts List:

(can be bought from any local electronics store)

• Arduino UNO Development Board

• Arduino sound sensor module

• Piezo Buzzer

• Male-female jumpers

• 7 segment display module

• Push switch (push-on, push-off)

Working Principle

First, the user has to preset the desired counter for the pressure cooker (ex. 2, 4, 5...up to 9) through a push button attached to the device. Now the device will consider any heavy sound as input and start increasing its internal counter. Whenever the pressure cooker whistles, the counter increases. And if it matches with the preset number (we set before using the push button switch), the buzzer will get triggered and alert the user that desired count has been reached.

Arduino Code

 //product Designed by Sourav Paul 
 //Date last updated on 05/06/18 , 07:09 AM
const int buttonPin = 13;     // the number of the pushbutton pin
const int buttonPowerPin =  2;      // the number of the LED pin
const int soundPin = 3; // the number of the sound sensor pin
int counter = 1; // set initial counter to value 1
const int buzzerPin = A1; // the number of buzzer pin
int whistle = 0; // initial whistle value to zero.
int buttonState = 0;         // current state of the button
int lastButtonState = 0;     // previous state of the button
int whistlestate = 0;
int lastwhistlestate = 0;     // previous state of the whistle
volatile int state = LOW;
boolean Counterflag = true;
unsigned long start, finished, elapsed;
//declare variables for 7 segment display
int seg_a = 11; // declare the variables
int seg_b = 10;
int seg_c = 9;
int seg_d = 8;
int seg_e = 7;
int seg_f = 6;
int seg_g = 5;
int seg_dp = 4;
int com = 12;
void blink() { 
  //ISR function
  state = !state; //toggle the state when the interrupt occurs
}
void print0()
{
 digitalWrite(seg_a,HIGH);
 digitalWrite(seg_b,HIGH);
 digitalWrite(seg_c,HIGH);
 digitalWrite(seg_d,HIGH);
 digitalWrite(seg_e,HIGH);
 digitalWrite(seg_f,HIGH);
 digitalWrite(seg_g,LOW);
 digitalWrite(seg_dp,LOW);
}
void print1()
{
 digitalWrite(seg_a,LOW);
 digitalWrite(seg_b,HIGH);
 digitalWrite(seg_c,HIGH);
 digitalWrite(seg_d,LOW);
 digitalWrite(seg_e,LOW);
 digitalWrite(seg_f,LOW);
 digitalWrite(seg_g,LOW);
 digitalWrite(seg_dp,LOW);
}
void print2()
{
  digitalWrite(seg_a,HIGH);
 digitalWrite(seg_b,HIGH);
 digitalWrite(seg_c,LOW);
 digitalWrite(seg_d,HIGH);
 digitalWrite(seg_e,HIGH);
 digitalWrite(seg_f,LOW);
 digitalWrite(seg_g,HIGH);
 digitalWrite(seg_dp,LOW);
}
void print3()
{
 digitalWrite(seg_a,HIGH);
 digitalWrite(seg_b,HIGH);
 digitalWrite(seg_c,HIGH);
 digitalWrite(seg_d,HIGH);
 digitalWrite(seg_e,LOW);
 digitalWrite(seg_f,LOW);
 digitalWrite(seg_g,HIGH);
 digitalWrite(seg_dp,LOW);
}
void print4()
{
digitalWrite(seg_a,LOW);
 digitalWrite(seg_b,HIGH);
 digitalWrite(seg_c,HIGH);
 digitalWrite(seg_d,LOW);
 digitalWrite(seg_e,LOW);
 digitalWrite(seg_f,HIGH);
 digitalWrite(seg_g,HIGH);
 digitalWrite(seg_dp,LOW);
}
void print5()
{
 digitalWrite(seg_a,HIGH);
 digitalWrite(seg_b,LOW);
 digitalWrite(seg_c,HIGH);
 digitalWrite(seg_d,HIGH);
 digitalWrite(seg_e,LOW);
 digitalWrite(seg_f,HIGH);
 digitalWrite(seg_g,HIGH);
 digitalWrite(seg_dp,LOW);
}
void print6()
{
 digitalWrite(seg_a,HIGH);
 digitalWrite(seg_b,LOW);
 digitalWrite(seg_c,HIGH);
 digitalWrite(seg_d,HIGH);
 digitalWrite(seg_e,HIGH);
 digitalWrite(seg_f,HIGH);
 digitalWrite(seg_g,HIGH);
 digitalWrite(seg_dp,LOW);
}
void print7()
{
 digitalWrite(seg_a,HIGH);
 digitalWrite(seg_b,HIGH);
 digitalWrite(seg_c,HIGH);
 digitalWrite(seg_d,LOW);
 digitalWrite(seg_e,LOW);
 digitalWrite(seg_f,LOW);
 digitalWrite(seg_g,LOW);
 digitalWrite(seg_dp,LOW);
}
void print8()
{
 digitalWrite(seg_a,HIGH);
 digitalWrite(seg_b,HIGH);
 digitalWrite(seg_c,HIGH);
 digitalWrite(seg_d,HIGH);
 digitalWrite(seg_e,HIGH);
 digitalWrite(seg_f,HIGH);
 digitalWrite(seg_g,HIGH);
 digitalWrite(seg_dp,LOW);
}
void print9()
{
 digitalWrite(seg_a,HIGH);
 digitalWrite(seg_b,HIGH);
 digitalWrite(seg_c,HIGH);
 digitalWrite(seg_d,HIGH);
 digitalWrite(seg_e,LOW);
 digitalWrite(seg_f,HIGH);
 digitalWrite(seg_g,HIGH);
 digitalWrite(seg_dp,LOW);
}
void setup() {
 digitalWrite(com,LOW);
 // initialize the pushbutton pin as an input:
 pinMode(buttonPin, INPUT);
 pinMode(buttonPowerPin, OUTPUT);
 digitalWrite(buttonPowerPin, HIGH);
 Serial.begin(9600);
 pinMode(soundPin, INPUT);
 pinMode(buzzerPin, OUTPUT);
 attachInterrupt(digitalPinToInterrupt(soundPin), blink, FALLING);
 pinMode(seg_a,OUTPUT); // configure all pins used to outputs
 pinMode(seg_b,OUTPUT);
 pinMode(seg_c,OUTPUT);
 pinMode(seg_d,OUTPUT);
 pinMode(seg_e,OUTPUT);
 pinMode(seg_f,OUTPUT);
 pinMode(seg_g,OUTPUT);
 pinMode(seg_dp,OUTPUT);
 pinMode(com,OUTPUT);
}
// func to play buzzer
void playbuzzer()
{
 digitalWrite(buzzerPin, HIGH);
 }
 // detect button state change
 void buttontstateChanged()
 {
   // read the pushbutton input pin:
buttonState = digitalRead(buttonPin);
 // compare the buttonState to its previous state
 if (buttonState != lastButtonState) {
   // if the state has changed, increment the counter
   if (buttonState == HIGH) {
     // if the current state is HIGH then the button went from off to on:
     counter++;
   } else {
   }
   // Delay a little bit to avoid bouncing
   delay(50);
 }
 // save the current state as the last state, for next time through the loop
 lastButtonState = buttonState;
 }
// print counter number in 7 segment display unit
void printcounterValue()
{
 switch(counter){
   case 1:
   print1();
   break;
   case 2:
   print2();
   break;
   case 3:
   print3();
   break;
   case 4:
   print4();
   break;
   case 5:
   print5();
   break;
   case 6:
   print6();
   break;
   case 7:
   print7();
   break;
   case 8:
   print8();
   break;
   case 9:
   print9();
   break;
 }
}
// print whistle number into 7 segment display 
void printwhistleValue()
{
 switch(whistle){
   case 0:
   print0();
   break;
   case 1:
   print1();
   break;
   case 2:
   print2();
   break;
   case 3:
   print3();
   break;
   case 4:
   print4();
   break;
   case 5:
   print5();
   break;
   case 6:
   print6();
   break;
   case 7:
   print7();
   break;
   case 8:
   print8();
   break;
   case 9:
   print9();
   break;
 }
}
//func to pre-set desired counter
void setCounter()
{
 start=millis();
 while(elapsed<=50000)    // 50 seconds time is given for setting counter timer
 {
 buttontstateChanged();
 printcounterValue();
 finished=millis();
 elapsed=finished-start;
 }
  Counterflag = false;
 }
void loop() {
 //Set counter at beginning of program
 if(Counterflag == true)
 {
 setCounter();
 }
 //calling whistle detecting function
printwhistleValue();
if(state==HIGH)
{
  whistle++;
 printwhistleValue();
  delay(20000); // 20 secs minimum gap is given between two whistle sounds.
  state = LOW;                                                                                                                                                                                                                                            ;
}
//compares if whistle number is greater than equal to pre-set counter, if yes then kick off buzzer alarm.
if(whistle>=counter)
{
 playbuzzer();
}
}