Linkit One Kitchen Timer Using Atmega

Leave a Comment / Using Atmega / By
Circuit 3

In this instructable I’m going to show you how to design a kitchen timer using the Linkit One, the timer has a maximum duration of 30 minutes. And once the timer is done counting down it fires a buzzer to notify you. The time interval can be set in steps of 5 minutes and each led indicating 5 minutes. You can also increase the maximum duration by adding extra LEDs and go up to a maximum of 50 minutes due to the limited number of pins on the Linkit one.

Linkit One Kitchen Timer

Step 1: Tools and Components

Tools and Components 2

 

 

 

 

 

 

 

 

 

 

 

 

All the components you require for this instructable are –

  • Linkit One
  • 6 Leds
  • Push Button
  • Buzzer
  • Jumper wires
  • Breadboard
  • 10k resistor

Step 2: Circuit

Circuit 3

 

 

 

 

 

 

 

 

 

 

 

 

The circuit is quite simple and all you need to do is follow the picture above. There are six LEDs and each LED indicates a 5 minute interval. By adding additional LEDs to the remaining digital pins you can improve the maximum duration of the timer circuit.

Step 3: Code

Code 1 (1)

 

 

 

 

 

 

 

 

 

 

 

Copy the below code and paste the below code in the Arduino IDE and then select a suitable COM port and upload the code to the Linkit One.

const int buttonPin = 2;     // the number of the pushbutton pin
const int ledPin =  13;      // the number of the LED pin
const int led2Pin = 12;
const int led3Pin = 11;
const int led4Pin = 10;      // the number of the LED pin
const int led5Pin = 9;
const int led6Pin = 7;
const int led7Pin = 6;      // the number of the LED pin
const int led8Pin = 5;
const int led9Pin = 4;
const int led10Pin = 3;
const int speakerOut = 1;// variables will change:
int buttonState = 0;         // variable for reading the pushbutton status
int tastyTimeVariable = 0;        // my time variable that has 1 added
int i;
int n;void setup() {
// initialize the LED pin as an output:
pinMode(ledPin, OUTPUT);    
pinMode(led2Pin, OUTPUT); 
pinMode(led3Pin, OUTPUT);
pinMode(led4Pin, OUTPUT);    
pinMode(led5Pin, OUTPUT); 
pinMode(led6Pin, OUTPUT); 
pinMode(led7Pin, OUTPUT);    
pinMode(led8Pin, OUTPUT); 
pinMode(led9Pin, OUTPUT); 
pinMode(led10Pin, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);     
pinMode(speakerOut, OUTPUT);  delay(3000);
}void loop(){
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);  // check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(ledPin, HIGH);
} 
else {
}
delay(1000);
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(led2Pin, HIGH);
} 
else {
} delay(1000);buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(led3Pin, HIGH);
} 
else {
}
delay(1000);
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(led4Pin, HIGH);
} 
else {
}
delay(1000);
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(led5Pin, HIGH);
} 
else {
}
delay(1000);
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(led6Pin, HIGH);
} 
else {
}
delay(1000);
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(led7Pin, HIGH);
} 
else {
}
delay(1000);
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(led8Pin, HIGH);
} 
else {
} delay(1000);buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(led9Pin, HIGH);
} 
else {
} delay(1000);buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {     
// add to timer    
tastyTimeVariable = tastyTimeVariable + 1;
digitalWrite(led10Pin, HIGH);
} 
else {
} delay(1000);
digitalWrite(led10Pin, LOW);
digitalWrite(led9Pin, LOW);
digitalWrite(led8Pin, LOW);
digitalWrite(led7Pin, LOW);
digitalWrite(led6Pin, LOW);
digitalWrite(led5Pin, LOW);
digitalWrite(led4Pin, LOW);
digitalWrite(led3Pin, LOW);
digitalWrite(led2Pin, LOW);
digitalWrite(ledPin, LOW);delay(1000);if (tastyTimeVariable == 0) {
}else if (tastyTimeVariable == 1) {
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
for (i=0; i < 20; i++) {
analogWrite(speakerOut,128);
delay(250);
digitalWrite(speakerOut, LOW);
delay(250);
}
}
else if (tastyTimeVariable == 2) {
digitalWrite (led2Pin, HIGH);
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
digitalWrite (led2Pin, LOW);
delay(300L * 1000L);
for (i=0; i < 20; i++) {
analogWrite(speakerOut,128);
delay(250);
digitalWrite(speakerOut, LOW);
delay(250);
}
//sound alarm
}else if (tastyTimeVariable == 3) {
digitalWrite (led3Pin, HIGH);
digitalWrite (led2Pin, HIGH);
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
digitalWrite (led3Pin, LOW);
delay(300L * 1000L);
digitalWrite (led2Pin, LOW);
delay(300L * 1000L);
for (i=0; i < 20; i++) {
analogWrite(speakerOut,128);
delay(250);
digitalWrite(speakerOut, LOW);
delay(250);
}
//sound alarm
}
else if (tastyTimeVariable == 4) {
digitalWrite (led4Pin, HIGH);
digitalWrite (led3Pin, HIGH);
digitalWrite (led2Pin, HIGH);
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
digitalWrite (led4Pin, LOW);
delay(300L * 1000L);
digitalWrite (led3Pin, LOW);
delay(300L * 1000L);
digitalWrite (led2Pin, LOW);
delay(300L * 1000L);
for (i=0; i < 20; i++) {
analogWrite(speakerOut,128);
delay(250);
digitalWrite(speakerOut, LOW);
delay(250);
}
//sound alarm
}
else if (tastyTimeVariable == 5) {
digitalWrite (led5Pin, HIGH); 
digitalWrite (led4Pin, HIGH);
digitalWrite (led3Pin, HIGH);
digitalWrite (led2Pin, HIGH);
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
digitalWrite (led5Pin, LOW);
delay(300L * 1000L);
digitalWrite (led4Pin, LOW);
delay(300L * 1000L);
digitalWrite (led3Pin, LOW);
delay(300L * 1000L);
digitalWrite (led2Pin, LOW);
delay(300L * 1000L);
for (i=0; i < 20; i++) {
analogWrite(speakerOut,128);
delay(250);
digitalWrite(speakerOut, LOW);
delay(250);
}
//sound alarm
}
else if (tastyTimeVariable == 6) {
digitalWrite (led6Pin, HIGH);
digitalWrite (led5Pin, HIGH); 
digitalWrite (led4Pin, HIGH);
digitalWrite (led3Pin, HIGH);
digitalWrite (led2Pin, HIGH);
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
digitalWrite (led6Pin, LOW);
delay(300L * 1000L);
digitalWrite (led5Pin, LOW);
delay(300L * 1000L);
digitalWrite (led4Pin, LOW);
delay(300L * 1000L);
digitalWrite (led3Pin, LOW);
delay(300L * 1000L);
digitalWrite (led2Pin, LOW);
delay(300L * 1000L);
for (i=0; i < 20; i++) {
analogWrite(speakerOut,128);
delay(250);
digitalWrite(speakerOut, LOW);
delay(250);
}
//sound alarm
}
else if (tastyTimeVariable == 7) {
digitalWrite (led7Pin, HIGH);
digitalWrite (led6Pin, HIGH);
digitalWrite (led5Pin, HIGH); 
digitalWrite (led4Pin, HIGH);
digitalWrite (led3Pin, HIGH);
digitalWrite (led2Pin, HIGH);
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
digitalWrite (led7Pin, LOW);
delay(300L * 1000L);
digitalWrite (led6Pin, LOW);
delay(300L * 1000L);
digitalWrite (led5Pin, LOW);
delay(300L * 1000L);
digitalWrite (led4Pin, LOW);
delay(300L * 1000L);
digitalWrite (led3Pin, LOW);
delay(300L * 1000L);
digitalWrite (led2Pin, LOW);
delay(300L * 1000L);
for (i=0; i < 20; i++) {
analogWrite(speakerOut,128);
delay(250);
digitalWrite(speakerOut, LOW);
delay(250);
}
//sound alarm
}
else if (tastyTimeVariable == 8) {
digitalWrite (led8Pin, HIGH);
digitalWrite (led7Pin, HIGH);
digitalWrite (led6Pin, HIGH);
digitalWrite (led5Pin, HIGH); 
digitalWrite (led4Pin, HIGH);
digitalWrite (led3Pin, HIGH);
digitalWrite (led2Pin, HIGH);
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
digitalWrite (led8Pin, LOW);
delay(300L * 1000L);
digitalWrite (led7Pin, LOW);
delay(300L * 1000L);
digitalWrite (led6Pin, LOW);
delay(300L * 1000L);
digitalWrite (led5Pin, LOW);
delay(300L * 1000L);
digitalWrite (led4Pin, LOW);
delay(300L * 1000L);
digitalWrite (led3Pin, LOW);
delay(300L * 1000L);
digitalWrite (led2Pin, LOW);
delay(300L * 1000L);
//sound alarm
}
else if (tastyTimeVariable == 9) {
digitalWrite (led9Pin, HIGH);
digitalWrite (led8Pin, HIGH);
digitalWrite (led7Pin, HIGH);
digitalWrite (led6Pin, HIGH);
digitalWrite (led5Pin, HIGH); 
digitalWrite (led4Pin, HIGH);
digitalWrite (led3Pin, HIGH);
digitalWrite (led2Pin, HIGH);
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
digitalWrite (led9Pin, LOW);
delay(300L * 1000L);
digitalWrite (led8Pin, LOW);
delay(300L * 1000L);
digitalWrite (led7Pin, LOW);
delay(300L * 1000L);
digitalWrite (led6Pin, LOW);
delay(300L * 1000L);
digitalWrite (led5Pin, LOW);
delay(300L * 1000L);
digitalWrite (led4Pin, LOW);
delay(300L * 1000L);
digitalWrite (led3Pin, LOW);
delay(300L * 1000L);
digitalWrite (led2Pin, LOW);
delay(300L * 1000L);
//sound alarm
}
else if (tastyTimeVariable == 10) {
digitalWrite (led10Pin, HIGH);
digitalWrite (led9Pin, HIGH);
digitalWrite (led8Pin, HIGH);
digitalWrite (led7Pin, HIGH);
digitalWrite (led6Pin, HIGH);
digitalWrite (led5Pin, HIGH); 
digitalWrite (led4Pin, HIGH);
digitalWrite (led3Pin, HIGH);
digitalWrite (led2Pin, HIGH);
digitalWrite (ledPin, HIGH);
delay(300L * 1000L);
digitalWrite (led10Pin, LOW);
delay(300L * 1000L);
digitalWrite (led9Pin, LOW);
delay(300L * 1000L);
digitalWrite (led8Pin, LOW);
delay(300L * 1000L);
digitalWrite (led7Pin, LOW);
delay(300L * 1000L);
digitalWrite (led6Pin, LOW);
delay(300L * 1000L);
digitalWrite (led5Pin, LOW);
delay(300L * 1000L);
digitalWrite (led4Pin, LOW);
delay(300L * 1000L);
digitalWrite (led3Pin, LOW);
delay(300L * 1000L);
digitalWrite (led2Pin, LOW);
delay(300L * 1000L);
for (i=0; i < 20; i++) {
analogWrite(speakerOut,128);
delay(250);
digitalWrite(speakerOut, LOW);
delay(250);
}
//sound alarm
}
else if (tastyTimeVariable > 10)  {
}
}

Step 4: Finishing

Finishing

 

 

 

 

 

 

 

 

 

 

 

 

Read more: Linkit One Kitchen Timer

 

Leave a Comment

Your email address will not be published. Required fields are marked *