View source for Arduino/C2/Display-counter-using-Arduino/English-timed

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| '''Time'''
|'''Narration'''

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| 00:01
| Welcome to the''' Spoken Tutorial''' on''' Display counter using Arduino.'''

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|00:07
|In this tutorial, we will learn to:

Connect an''' LCD''' and a '''Push button''' to''' Arduino''' board and
 
Write a program to increase the count whenever the '''pushbutton''' is pressed'''.'''

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| 00:22
| To follow this tutorial, you should have:

Basic knowledge of''' Electronics '''and

Basic knowledge of''' C''' or''' C++''' programming language

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| 00:34
| To record this tutorial, I am using:

'''Arduino UNO Board'''
'''Ubuntu Linux 14.04''' operating system and
'''Arduino IDE'''

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| 00:47
| In an earlier tutorial in this series, we had created a circuit using '''Arduino''' and '''LCD'''.
We will use the same '''circuit''' in this tutorial.

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| 01:00
| Here, we will add a '''pushbutton''' and make a simple counter.

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| 01:06
|We have already learnt about the working of pushbutton in an earlier tutorial.

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| 01:12
| Now let us learn the connection circuit details.

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| 01:17
| A '''pushbutton '''is connected to a '''100 ohm resistor.'''

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| 01:22
|The''' pushbutton''' is connected to '''pin '''number''' 7 '''and a '''100 ohm resistor''' is connected to the '''ground'''.

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| 01:31
|All other connections are exactly the same as in our previous experiment.

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| 01:37
| This is the live setup of the connection, as shown in the circuit diagram.

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| 01:44
| Now we will write a program in the '''Arduino IDE.'''So let’s switch to the '''Arduino IDE'''.

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| 01:54
| First, we need to include the '''Liquid crystal library.'''

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| 01:59
| Type the code as shown.

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| 02:02
|I have initialized a variable '''lcd '''of type''' LiquidCrystal. '''

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| 02:08
|Here, '''pin '''number''' 12''' is initialized as '''Register''' '''Select '''and '''pin '''number''' 11''' as '''Enable.'''

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| 02:19
|The next 4 parameters represent '''data lines''' of '''LCD.'''

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| 02:25
| In the '''void setup function''', type '''lcd.begin 16 comma 2 '''as shown.
This command initializes the '''LCD''' with rows and columns.

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| 02:41
| Next we will setup the '''pin '''number''' 7''' as '''INPUT'''.Type the code as shown.

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| 02:49
|In another way, we can store the '''pin''' number in a variable '''pbutton.'''
Let us define the '''pbutton '''variable as shown.

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| 03:01
| Now we will write the code for '''void loop.'''
Whenever the '''pushbutton''' is pressed, one count is increased on the '''LCD'''.

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| 03:11
| We will write a simple '''if statement''' to check whether the '''pushbutton''' is pressed or not.

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| 03:19
| Before displaying the count, let us check the status of the button.

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| 03:25
|This command will set the cursor position in the '''LCD'''.

'''lcd.print''' will print the message.

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|03:35
| We will now '''compile''' and '''upload''' the program. Now, I will press the '''pushbutton'''.

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| 03:43
| Here we see the message '''“button pressed”''' in the '''LCD'''. 
It shows that the '''pushbutton''' is working successfully.

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| 03:54
| Next we will modify the program to set a '''counter'''.

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| 03:58
| We need a variable for counter. Now, we will initialize the variable '''count''' to '''zero'''.

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| 04:08
| Modify the '''print''' statement as shown here.

'''count++ '''will increase the count by one, each time the button is pressed.

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| 04:21
|Let us now '''compile''' and '''upload''' the program. Now, I will press the '''pushbutton'''.

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| 04:29
| It didn't work as expected. We see a different count displayed here.
Why is this so?

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| 04:37
| This is because we specified the status for button pressed.
But we didn't mention the status for button released.

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| 04:46
|The output shows the incremented number based on the button pressed time.

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| 04:52
| So, we will write a '''while statement,''' as shown here.

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| 04:57
|This will display the count when the '''pushbutton''' is in pressed state. 

That means the '''pin 7''' is in '''HIGH''' mode.

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| 05:07
|When you release the button, the state is '''LOW''' and it will come out of the '''while''' '''loop'''.

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| 05:14
| Let me explain the program.

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| 05:17
|The program starts with initialization of the '''LCD'''. We have the variable '''pbutton '''and''' count.'''

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| 05:26
|Inside the '''void setup function''', we have initialized the '''LCD''' with 16 columns and 2 rows.
Then the '''pinMode''' is input for the '''pin '''number''' 7'''.

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| 05:42
|In the''' void loop function''', we are checking the condition whether the '''pushbutton''' is '''HIGH''' or not.

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| 05:49
|When the '''pushbutton''' is pressed, the cursor is set to position zero comma zero.

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| 05:56
|The '''lcd.print statement '''will print the count value.
Initially '''count''' is zero. '''Count plus plus''' would be 1.

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| 06:09
|When the button is released, it will break the '''while''' '''loop''' and come out of the loop.

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| 06:15
|Again, if you press the button, the next iteration begins and it increases the count.

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| 06:23
| Let us '''compile''' and '''upload''' the program.

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| 06:27
| Now I'll press the button once and release it.

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| 06:32
| Again I'll press and release the button.You can see that the count is increased whenever the button is pressed.

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| 06:42
| This brings us to the end of this tutorial. Let us summarize.

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| 06:47
|In this tutorial, we learnt to:

Connect an''' LCD''' and '''pushbutton''' to''' Arduino''' board and
 
Write a program to display the count''' '''whenever the pushbutton is pressed.

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| 07:03
| Do the following assignment.

Change the same program to display the count as 2,4,6 and so on.

'''Compile''' and '''upload''' the program and

Observe the count displayed in the '''LCD'''.

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| 07:21
| The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.

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| 07:29
| The''' Spoken Tutorial Project''' Team:
conducts workshops and gives certificates.For more details, please write to us.

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| 07:38
| Please post your timed queries in this forum.

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| 07:42
| Spoken Tutorial project is funded by NMEICT, MHRD, Government of India.More information on this mission is available at this link.

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| 07:53
|This tutorial has been contributed by FOSSEE and Spoken Tutorial Project, '''IIT Bombay'''. Thanks for watching.

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