View source for CircuitJS/C3/OR-Gate/English

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|| '''Visual Cue'''
|| '''Narration'''
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|| slide:1
|| Welcome to the spoken tutorial on '''OR''' gate using '''circuitjs''' simulator
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|| Slide 2:

Learning Objective
|| In this tutorial, we will learn about:
* OR Gate and
* Verify its truth table

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|| Slide 3:

Prerequisite
|| To follow this tutorial, you should have a basic knowledge of,
* Electrical circuits

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|| Slide 4:

System Requirement
|| To record this tutorial, I am using:
* '''Ubuntu Linux '''20.04 OS
* CircuitJS Application

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|| OR Gate Circuit.png
|| We will create this circuit using switches and LEDs for the '''OR''' Gate''' '''demonstration'''.'''
|- 
|| Show the diagram

OR Gate circuit.png

|| To do this experiment, we will need
* 2 Switches
* 2 Resistors of 220 Ohm
* 1 DC Power supply of 5 Volts
* 1 LED

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|| Keep the circuit diagram on the top right
|| Let us open the '''circuitjs''' interface.

Click on '''File''' and select '''New Blank Circuit.'''
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|| Click on the '''Draw''' option

Browse through the menu
|| Click on the '''Draw''' menu.

Go to the '''Passive Components''', and then select '''Add Switch'''.

Drag and place the switch in the working space.
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|| Point to the switch
|| We will use 2 switches in this circuit.

Right-click on the switch, then select the '''Duplicate '''option to make another one.

Place both the switches in parallel alignment as shown.

In this circuit, these switches act as '''INPUTs''' for the '''OR''' Gate.
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|| Add Resistor
|| Go to '''Draw''', and select the '''Add Resistor''' option.

Drag and draw the resistor as shown.

Change the resistor value to 220 Ohms using the '''Edit''' option.

Use the '''Duplicate''' option to have another resistor of 220 Ohms.

Connect one resistor each to the switches in series connection.
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|| Show the path to find the DC power supply and draw it
|| Now we need a '''DC Power''' supply to make the circuit work.

Click on '''Draw''', then go to '''Inputs and Sources''' to see a list of components.

Select '''Add Voltage Source (2-terminal)''', and drag the DC power supply.

Place the power supply in the working space, as shown in the video.
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|| Add LED
|| We need an LED to show the output of the circuit.

Click on the '''Draw '''menu and then go to the '''Outputs and Labels''' option and

select '''Add LED.'''

Now click and drag to draw the '''LED''' in the working space.
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|| Use wire
|| We have all the required components in the working space. 

Now let's connect the components using wires.
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|| Add Text
|| Use the''' Add Text''' option to label the switches and LED.

Give names to these switches as A and B and to the LED as Y.
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|| Slide:

OR Gate Truth Table.png
|| This is the truth table for the '''OR''' Gate, where A and B are the inputs and Y is the output.

When any one of the inputs is 1, the OR Gate gives the output as 1.

If both the inputs in the OR gate are zero, then the output is zero.
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|| 
|| Let us go to '''circuitJS''' simulator to verify the truth table of '''OR''' gate.
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|| 
|| For the first condition in the truth table, both inputs A and B are 0, i.e. they are LOW.
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|| 
|| This means, we have to open both switches A and B in the circuit.

Click on the center of the switch to open it.

Now we can see that the output LED is not glowing.

This indicates that the output Y is 0, as given in the truth table.

Thus the first condition is verified.
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|| 
|| For the second case, input A is 0 and input B is 1.

To attain this condition in the circuit, keep switch A open and close switch B as shown.

Note that the output LED is now glowing.

This indicates that the output Y is 1, as given in the truth table.

Thus the second condition is verified.
|- 
|| Slide :

Assignment1

Image
|| As an assignment,

* Using the switches and LED circuit, verify the '''OR''' gate truth table 

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|| 
|| Next we will see how to use the '''OR''' gate component provided by '''CircuitJS''' simulator.
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|| Click on '''Draw''', Go to '''Logic Gates, Input and Output.'''

Select '''Add OR Gate''' option.
|| Click on '''Draw''', Go to '''Logic Gates, Input and Output.'''

Select '''Add OR Gate''' option.

Click and drag the cursor in the working space to draw the '''OR gate'''.
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|| 
|| We require two logic inputs and one logic output to see the working of '''OR gate'''.
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||  Click on '''Draw''', Go to '''Logic Gates, Input and Output.'''

Select''' Add Logic Input''' option.
|| Click on '''Draw''', Go to '''Logic Gates, Input and Output.'''

Select''' Add Logic Input''' option.

Click and drag the cursor in the working area to draw the logic input.

Press the '''Esc''' key to deselect the component wherever required.
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|| Right click on the logic input and select the '''Edit''' option. 
|| Right click on the logic input and select the '''Edit''' option. 

In the pop-up window , check the '''Numeric''' box and click on the OK button to save the changes.

By doing this, the input values will be shown in either 0’s or 1’s.

As we require two logic inputs, let us select the '''Duplicate''' option.

Now we have two logic inputs.

Connect these logic inputs to the input pins of the '''OR''' gate as shown.
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|| Go to '''Draw''', click on '''Logic gates, Input and Output.'''

Select '''Add Logic output '''and draw it in the working space.

Right click on the logic output and select the '''Edit''' option. 
|| Next we will add one logic output to the '''OR''' gate.

Now, go to '''Draw''', click on '''Logic gates, Input and Output.'''

Then Select '''Add Logic output '''and draw it in the working space.

Right click on the logic output and select the '''Edit''' option. 

In the pop-up window , check the '''Numeric''' box and click on the OK button to save the changes.

By doing this, the output value will be shown in either 0’s or 1’s.

Connect the logic output to the output pin of '''OR''' Gate.
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|| Click the  '''Add text '''option to give labels to pins.
|| Use the '''Add text '''option to give labels to pins as shown.

Letters A and B are the inputs and Y is the output.
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|| Click on the input B to make its value 1.
|| To change the state of the input value from 0 to 1 or vice-versa, click on the input value.

Now click on the input B to make its value 1.

Notice the output value Y is 1.

It implies that when at least one of the inputs is 1, the output will be 1.

Check the remaining two conditions according to the OR gate truth table.
|- 
|| Only narration
|| This brings us to the end of this tutorial. 

Let us summarize.
|- 
|| Slide

Summary
|| In this tutorial, we learnt about
* OR Gate and
* Verify its truth table

|- 
|| Slide: Assignment 2
|| As an assignment,

* With the '''OR''' gate component, check and verify the '''OR''' gate truth table 

|- 
|| Slide :

About Spoken Tutorial project
|| The video at the following link summarizes the Spoken Tutorial project.

Please download and watch it.
|- 
|| Slide&nbsp;:Spoken Tutorial workshops
|| The&nbsp;'''Spoken Tutorial Project'''&nbsp;Team conducts workshops and gives certificates.

For more details, please write to us.
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|| Slide : Forum for specific questions
|| Please post your timed queries in this forum
|- 
|| Acknowledgement
|| Spoken Tutorial project was established by the Ministry of Education(MoE), Govt of India
|- 
|| Thank You
|| This tutorial has been contributed by FOSSEE and Spoken Tutorial Project, IIT Bombay.

Thanks for watching.
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