View source for OpenPLC-version1-with-LDmicro/C2/OpenPLC-Traffic-Light-and-Switchboard-Modules/English


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|| '''VISUAL CUE'''
|| '''NARRATION'''
|-
|| Slide 1: 
|| Welcome to the spoken tutorial on '''OpenPLC Traffic Light & Switchboard modules.'''
|- 
|| Slide 2: Learning Objectives
* OpenPLC''' '''Traffic light module
* OpenPLC Switchboard module

|| In this tutorial, we will learn about
* '''OpenPLC Traffic light''' module
* '''OpenPLC Switchboard''' module
|- 
|| Slide 3: System Requirements
* Ubuntu Linux 18.04 operating system
* OpenPLC Traffic light module
* OpenPLC Switchboard module
* OpenPLC version 1 Mainboard
* 24V, 2A SMPS

|| To record this tutorial I am using:
* '''Ubuntu Linux 18.04''' operating system
* '''OpenPLC''' '''Traffic light''' module
* '''OpenPLC Switchboard''' module
* '''OpenPLC version 1 Mainboard'''
* '''24V, 2A SMPS'''
|- 
|| Slide 4: Pre-requisites
* OpenPLC version 1 Mainboard
* If not, please refer to the relevant tutorials from [https://spoken-tutorial.org/ Home | spoken-tutorial.org]

|| 
* To follow this tutorial, you should know about '''OpenPLC version 1''' '''Mainboard'''.
* If not, please refer to the relevant tutorials in this series on this website.

|- 
|| 
|| First we will learn about the '''OpenPLC Traffic light module'''.
|- 
|| Slide 5: Traffic Light module

This '''module''' is used to 
* implement the working of '''traffic lights'''
* visualize the status of any process with the '''built-in LEDs'''
|| 
This '''module''' is used to
* implement the working of '''traffic lights''' and
* visualize the status of any process with the '''built-in LEDs'''.

|- 
|| Traffic.jpg

|| This is a picture of the '''Traffic light module'''.

This '''module''' replicates a '''traffic light'''. 

It has one red '''LED''' marked as '''STOP''' and one yellow '''LED''' marked as '''READY'''. 

At the bottom, it has 3 green '''LEDs''' marked as '''LEFT, GO '''and''' RIGHT.'''
|- 
|| led-connectors.png

|| You can access all these '''LEDs''' using the '''connectors''' present below. 
|- 
|| traffic-sled.png or (traffic.jpg)

|| The red '''LED''' can also be accessed through the two '''connectors''' on the right of it.

If you want to use a single '''LED''' you can use these '''connectors'''.
|- 
|| 
|| Let us see how to do simple experiments using a single '''LED'''.
|- 
|| traffic.jpg
|| The '''anode''' and '''cathode''' of the red '''LED''' are given as '''connectors''' to the right of it.

The '''anode''' is marked as '''+5V''' and '''cathode''' as '''GND''', which is '''Ground'''.
|-
|- 
|| 

|| These '''connectors''' can be connected in 3 different ways.

We will see one by one.
|- 
|| traffic.jpg

|| We can connect '''+5V pin''' to '''5V''' and '''GND pin''' to any '''I/O pin''' of the '''microcontroller'''.
|- 
|| traffic.jpg
|| Connect '''GND pin''' to 0V and '''+5V pin''' to any '''I/O pin''' of the '''microcontroller'''.
|- 
|| traffic.jpg
|| Otherwise connect both '''+5V''' and '''GND pins''' to the '''I/O pins''' of the '''microcontroller'''. 
|- 
|| Led-connectors.png

traffic.jpg image
|| We will see how to use '''LEDs''' with the '''connectors''' at the bottom of the '''module'''.

Each '''LED’s cathode''' is taken out through the '''connectors''' at the bottom of the '''module'''.

Note that the rightmost '''pin''' marked as '''‘EN’''' is not an '''LED connector'''. 
|-
|- 
|| Led-connectors.png

traffic.jpg image
|| Each '''connector''' is marked with the first letter of the respective '''LED''' name.

We will see one by one starting from right.
# '''Ri''' is for green '''LED''' marked as '''RIGHT'''
# '''S''' is for red '''LED''' marked as '''STOP'''
# '''Re''' is for yellow '''LED''' marked as '''READY'''
# '''G''' is for green '''LED''' marked as '''GO'''
# '''L''' is for green '''LED''' marked as '''LEFT'''.

|- 
|| traffic-enable.png
|| '''‘EN’''' is an '''active low enable pin''' which enables all the '''LED pins'''.

To the left of the yellow '''LED''', we can find a '''connector''' marked '''+5V'''.

This is the '''power pin''' of the '''module'''.

That is, none of the '''LED''' glows unless you make these two connections.
|- 
|| Slide 6: LED to glow 
* +5V pin should be given 5V.
* EN and the respective '''LED''' pin should be grounded or given a logic-low signal.

|| Therefore, for any '''LED''' to glow you should follow the below:
# '''+5V pin''' should be given '''5V'''.
# '''EN''' and the respective '''LED pin''' should be '''ground'''ed or given a '''logic-low signal'''.

|- 
|| 
|| Now we’ll see the working of the '''module'''.
|- 
|| Slide 7: How can the '''Traffic Light module''' be powered?

'''Traffic Light module''' can be powered using the output power pins of the Mainboard
|| How can the '''Traffic Light module''' be powered?

It can be powered using the output '''power pins''' of the '''Mainboard'''.
|- 
|| SMPS-Mainboard.jpg - add in editing
|| Connect the '''SMPS''' to the '''Mainboard''' as shown here.
|- 
|| led-connectors.png
|| First we will see the demo of this '''module''' using the '''connectors''' available at the bottom.
|- 
|| demo1.png

Point to the image as per narration
|| Connect '''5V''' to the '''power pin''' i.e. '''+5V pin''' to the left of the yellow '''LED'''. 

Connect '''0V''' to the '''‘EN’ pin'''.

Then, connect '''0V''' to any of the '''LEDs'''.

I’m connecting it to the '''pins''' marked '''‘G’''', '''‘Re’''' and '''‘S’'''.
|- 
|| demo1.png
|| Make the connections as shown in the picture.

Remember to turn '''off''' the '''power supply''' when you change or make new connections.
|- 
|| Turn '''on''' the '''power supply''' 
|| After making all the connections turn '''on''' the '''power supply''' of the '''Mainboard'''.

The red, yellow and middle green '''LED''' has started glowing.
|- 
|| 
|| Do not use '''I/O pins''' of the '''Mainboard''' to power up the '''pin''' marked '''+5V'''.

Because it may affect the intensity of the '''LED'''. 
|- 
|| Disconnect the '''‘EN’ pin'''
|| Now disconnect the '''‘EN’ pin'''.

We can observe that all '''LEDs''' go '''off'''.
|- 
|| Turn '''off''' the '''power supply'''
|| Turn '''off''' the '''power supply'''.
|- 
|| traffic-sled.png
|| Next, we will see the demo on how to use this '''module''' when a single '''LED''' is needed.
|- 
|| demo2.png
|| Connect '''5V''' to the '''+5V pin''' on the right of the red '''LED'''.

Connect '''0V''' to the '''pin''' marked '''GND'''.
|- 
|| Turn '''on''' the '''power supply'''
|| Turn '''on''' the '''power supply'''.

This will make only the red '''LED''' to glow.

Thus, there is no need to connect power and enable '''pins''' for this connection.
|- 
|| Turn '''off''' the '''power supply'''
|| Turn '''off''' the '''power supply'''.
|- 
|| 
|| We have seen how '''Traffic light module''' can be used in different ways.
|- 
|| 
|| Now we’ll learn about the '''OpenPLC Switchboard module'''.
|- 
|| Slide 5: Switchboard module
* The goal of this '''module''' is to get familiarized with different types of '''switches'''
* In particular their usage in the real time applications in industries
|| 

The goal of this '''module''' is to get familiarized with different types of '''switches'''.

In particular their usage in the real time applications in industries.
|- 
|| Slide 6: Main Components
* 4 Normally Open '''switches'''
* 4 Normally Closed '''switches'''
* 2 '''Latched action switches''' and
* '''LEDs''' for each '''switch'''

|| This module has
* 4 Normally Open '''switches'''
* 4 Normally Closed '''switches'''
* 2 '''Latched action switches''' and
* '''LEDs''' for each '''switch'''

|- 
|| switchboard.jpg
|| This is the '''Switchboard module'''.
|- 
|| Slide 7: Types of Switches:
* Normally open (NO)
* Normally closed (NC)
* Latched action (L)

|| In this '''module''', there are three kinds of '''switches''' available.

They are '''Normally Open, Normally Closed '''and''' Latched action switches.'''

'''Normally Open''' is represented as '''NO''' and '''Normally Closed''' is represented as '''NC'''.

'''Latched action switches''' are represented as '''L'''.
|- 
|| SB-switches.png
|| We will now look at their arrangement on the '''module''' from bottom to top.
|- 
|| SB-switches.png

Highlight Latch switches

Then NC and then NO
|| At the bottom, we have two '''Latched action switches'''.

Above that we have 4 '''Normally Closed''' and then 4 '''Normally Open switches'''.
|- 
|| SB-leds.png

|| Above these '''switches''' we have '''LEDs''' corresponding to each '''switch'''. 

The '''LEDs''' are arranged in the same order as that of '''switches'''.
|- 
|| 
|| Each '''LED''' glow indicates a corresponding '''switch''' press.
|- 
|| SB-connectors.png
|| On the top we have '''female berg connectors''' for connections.
|- 
|| SB-connectors-z.png

Point to each particular pin
|| Next, we will see about the '''pins'''.

Starting from the right, the first two '''pins''' are '''GND''' and '''5V''' respectively.

These are the input '''power pins''' of this '''module.'''

Then we have 4 '''pins''' for 4 '''NO switches '''and 4 pins for 4 '''NC switches.''' 

The last 2 '''pins''' are for 2 '''latched action switches'''.
|- 
|| Slide 8: Important Note
* NO and latched action '''switches''' must be connected to the '''I/Os''' of the '''microcontroller'''
* Only then the '''LEDs''' of the corresponding '''switches''' will work
* '''LEDs''' of '''NC switches''' will work, even if they are not connected to '''I/Os'''

|| '''NO''' and '''Latched action switches''' must be connected to the '''I/Os''' of the '''microcontroller'''.

Only then the '''LEDs''' of the corresponding '''switches''' will work.

LEDs of '''NC switches''' will work, even if they are not connected to the '''I/Os''' of the '''microcontroller'''.
|- 
|| 
|| Now, we’ll learn how each type of the '''switch''' works.
|- 
|| Slide 9: Normally Open Switch
* The output '''pin''' of a '''NO switch '''will read '''logic 0''' when it is not pressed
* When the '''switch''' is pressed, the output '''pin''' will read '''5V'''
* This is due to the supply from the '''microcontroller'''’s internal '''pull up register'''

|| The output '''pin''' of a '''NO switch '''will read '''logic 0''' when it is not pressed.

When the '''switch''' is pressed, the output '''pin''' will read '''5V'''.

This is due to the supply from the '''microcontroller'''’s internal '''pull up register'''.
|- 
|| Slide 10: Normally Closed switch
* The output '''pin''' of a '''NC switch''' will read '''5V''' when it is not pressed
* This is due to the supply from the '''microcontroller'''’s internal '''pull up register'''
* Upon '''switch''' press, the output '''pin''' will read '''logic 0''' or '''ground'''

|| The output '''pin''' of a '''NC switch''' will read '''5V''' when it is not pressed.

This is due to the supply from the '''microcontroller'''’s internal '''pull up register'''.

Upon '''switch''' press, the output '''pin''' will read '''logic 0''' or '''ground'''.
|- 
|| Slide 11: Latched action switch
* It is basically a '''push-to-make, push-to-break''' type of '''switch'''
* That is, the output '''pin''' will read '''5V''', when it is pressed for the first time
* The output '''pin''' will read '''0V''', when it is pressed for the second time

|| '''Latched action switch''' is basically a '''push-to-make, push-to-break''' type of '''switch'''.

That is, the output '''pin''' will read '''5V''', when it is pressed for the first time.

The output '''pin''' will read '''0V''', when it is pressed for the second time.

Working of the '''LED''' of a''' latched action switch '''corresponds to that of a''' NO switch.'''
|- 
|| Slide 12: How can the Switchboard module be powered?

'''Switchboard module''' can be powered using the output '''power pins''' of the '''Mainboard'''
|| How can the '''Switchboard module''' be powered?

It can be powered using the output '''power pins''' of the '''Mainboard'''.
|- 
|| 
|| We have learnt about the different types of '''switches''' in the '''Switchboard module'''.
|- 
|| 
|| Using these '''modules''' we will learn about '''LDmicro''' instructions on '''OpenPLC''' in future tutorials.
|- 
|| 
|| This brings us to the end of this tutorial.

Let us summarize.
|- 
|| Slide 8: Summary
* '''OpenPLC Traffic light module'''
* '''OpenPLC Switchboard module'''

|| In this tutorial, we learnt about
* '''OpenPLC Traffic light module'''
* '''OpenPLC Switchboard module'''
|- 
|| Slide 9: About

Spoken Tutorial project
|| The video at the following link summarises the Spoken Tutorial project.

Please download and watch it
|- 
|| Slide 10:

Spoken Tutorial workshops
|| The''' Spoken Tutorial Project''' team:
*conducts workshops using spoken tutorials and
*gives certificates on passing online tests.

For more details, please write to us.
|- 
|| Slide 11:

Forum for specific questions:
|| Please post your timed queries in this forum.
|- 
|| Slide 12:

Forum for specific questions:
|| Do you have any general / technical questions on OpenPLC?

Please visit the FOSSEE forum and post your question.
|- 
|| Slide 13:

Acknowledgement
|| Spoken Tutorial Project is funded by MHRD, Government of India.
|- 
|| Slide 14:

Thank you slide
|| This tutorial has been contributed by FOSSEE and Spoken Tutorial Project, IIT Bombay.

And this is Harsha Priyanka from the FOSSEE team, signing off.

Thanks for watching.
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