View source for OpenPLC-version1-with-LDmicro/C2/OpenPLC-Traffic-Light-module/English



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

|| In this tutorial, we will learn about
* '''OpenPLC Traffic light''' module
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|| Slide 3: System Requirements
* Ubuntu Linux 18.04 operating system
* OpenPLC Traffic light 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 version 1 Mainboard'''
* '''24V, 2A SMPS'''
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|| Slide 4: Pre-requisites
|| * 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.

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|| Slide 5: Traffic Light module
|| This module is used to 
* implement the working of traffic lights and
* visualize the status of any process with the built-in LEDs.
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|| 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.'''
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|| led-connectors.png

|| You can access all of these '''LEDs''' using the connectors present below. 
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|| 

|| 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.
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|| 
|| Let us see how to do simple experiments using a single '''LED'''.
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|| 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'''.
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|- 
|| 

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

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

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

Note that the rightmost pin marked as '''‘EN’''' is not an '''LED''' connector. 
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|- 
|| 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 for red '''LED''' marked as '''STOP'''
# Re for yellow '''LED''' marked as '''READY'''
# G is for green '''LED''' marked as '''GO'''
# L is for green '''LED''' marked as '''LEFT'''.
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|| 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.
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|| Slide 6: LED to glow (patch-ledtoglow.webm)* +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 grounded or given a logic-low signal.

|- 
|| 
|| Now we’ll see the working of the module.
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|| 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.
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|| SMPS-Mainboard.jpg - add in editing
|| Connect the SMPS to the Mainboard as shown here.
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|| 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’'''.
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|| demo1.png

|| Make the connections as shown in the picture.

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

The red, yellow and middle green '''LED''' has started glowing.
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|| 
|| 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. 
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|| 
|| Now disconnect the '''‘EN’''' pin.

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

Connect 0V to the pin marked GND.
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|| 
|| 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.
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|| 
|| Turn off the power supply.
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|| 
|| We have seen how traffic light module can be used in different ways.
|- 
|| 
|| This brings us to the end of this tutorial.

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

|| In this tutorial, we learnt about
* '''OpenPLC Traffic light''' 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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