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[[User:Guru|Guru]] ([[User talk:Guru|talk]]) 14:35, 7 November 2015 (IST)
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[[Category:AVR Tutorials]]
 
[[Category:AVR Tutorials]]
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After blinking the leds, its time to control these leds depending on external inputs. In this tutorial we will interface a DIP switch to one of the Port's and display its status on LED's connected to other port.
 +
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=Register Configuration =
 +
Please refer the below tutorial for basics of GPIO register configuration.
 
<html>
 
<html>
<title>The Rock (1996)</title>
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<ul>
<meta property="og:title" content="The Rock" />
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<a href="https://www.exploreembedded.com/wiki/2._AVR_I/O_Register_Configuration">AVR I/O Register Configuration
<meta property="og:type" content="video.movie" />
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</a>
<meta property="og:url" content="http://www.imdb.com/title/tt0117500/" />
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</ul>
<meta property="og:image" content="http://ia.media-imdb.com/images/rock.jpg" />
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</html>
 
</html>
We will interface a DIP switch to one of the port pins and LED's to other port pins.
 
  
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=Code=
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Below points needs to be considered for this example.
 +
* Include the io.h file as it has the definitions for all the PORT registers.
 +
* Configure PORTA as inputs to read the switch status.
 +
* Configure the PORTC as Output to display the switch stauts on Leds.
 +
* Continuously read the switch status and display it on Leds.
 +
<html>
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<script src="https://gist.github.com/SaheblalBagwan/310b1582e0bec2ad28ad.js"></script>
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</html>
  
=Hookup=
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==LEDs and Switches Wiring diagram==
You may look this up with the simple breadboard as shown in section below or you could use the Ultra AVR dev kit if do not wish to jumble with wires and resistors.
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[[File:Switch_led_AVR.png]]
==Type 1:Breadboard with Explore AVR 40 Pin Breakout Board with Atmega32==
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===Components Used===
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{| class="wikitable"
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=Explore Ultra AVR Dev Kit=
|-
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| 1||
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<html><img src ="https://www.exploreembedded.com/blog/wp-content/uploads/img-collections/avr-mcu-breakout/1-dsc02958.jpg" width="300 px"></html>
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|| AVR 40 pin breakout board with Atmega32<br />
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[https://www.exploreembedded.com/product/AVR%2040%20Pin%20Breakout%20Board%20with%20Atmega32 Click here to buy from our store]
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|-
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|2||
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<html><img src ="https://www.exploreembedded.com/blog/wp-content/uploads/img-collections/breadboard-large/breadboard_large.jpg" width="300 px"></html>
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|| Breadboard <br />
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[https://www.exploreembedded.com/product/Large%20Breadboard Click here to buy from our store]
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|-
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| 3||
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<html><img src ="https://www.exploreembedded.com/blog/wp-content/uploads/img-collections/male-to-male-jumper-wires-pack-of-40/1-dsc04497.jpg" width="300 px"></html>
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|| Male to Male Jumper Wires <br />
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[https://www.exploreembedded.com/product/Male%20to%20Male%20Jumper%20Wires%20-%20Pack%20of%2040 Click here to buy from our store]
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|-
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| 4||
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<html><img src ="https://www.exploreembedded.com/blog/wp-content/uploads/img-collections/led-5mm-red/5mm_red_led.jpg" width="300 px"></html>
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|| LED - 5mm RED <br />
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[https://www.exploreembedded.com/product/LED%20-%205mm%20RED Click here to buy from our store]
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|-
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| 5||
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<html><img src ="https://www.exploreembedded.com/blog/wp-content/uploads/img-collections/resistor/3_resistors.jpg" width="300 px"></html>
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|| Resistor <br />
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[https://www.exploreembedded.com/product/10K%20ohm%20Resistor Click here to buy from our store]
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|-
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|| 6||
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<html><img src ="https://www.exploreembedded.com/blog/wp-content/uploads/img-collections/dip-switche-8-position/8-way-dip-switch.jpg" width="300 px"></html>
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|| DIP Switch - 8 Position <br />
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[https://www.exploreembedded.com/product/DIP%20Switch%20-%208%20Position Click here to buy from our store]
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|}
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==Wiring diagram==
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<html><img src ="https://www.exploreembedded.com/blog/wp-content/uploads/img-collections/fritzing-tutorials_de69ccc2/switch_breadboard_bb.png" width="670 px"></html>
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==Type 2:Using Explore Ultra AVR Dev Kit==
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===Components Used===  
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The Explore Ultra AVR Kit comes with all the things required, not just for this experiment but for the entire series. And even if you think of migrating to PIC or Arduino, you'll have breakout boards that fit on to this, hence we believe it is a great investment for learning hands on Embedded Systems. The kit is fully open source, you may use the schematics, the design files and all of the source code and build something cool on your own. And when you do that do not forget to share with us what you've done. We would be happy to see you building something cool.
 
The Explore Ultra AVR Kit comes with all the things required, not just for this experiment but for the entire series. And even if you think of migrating to PIC or Arduino, you'll have breakout boards that fit on to this, hence we believe it is a great investment for learning hands on Embedded Systems. The kit is fully open source, you may use the schematics, the design files and all of the source code and build something cool on your own. And when you do that do not forget to share with us what you've done. We would be happy to see you building something cool.
 
 
<html>
 
<html>
 
<ul>
 
<ul>
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</html>
 
</html>
  
<html><img src ="https://www.exploreembedded.com/blog/wp-content/uploads/img-collections/fritzing-tutorials_de69ccc2/switch_bb.png" width="670 px"></html>
 
  
=Code=
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=Video Tutorial=
<syntaxhighlight>
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For those of you, who would like to watch instead of read we have made a video with all the gyan.
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<br>
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{{#ev:youtubehd|-lNAmSNV2-Q|640}}
  
/*-----------------------------------------------------------------------------
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[[File:0Switch LED AVR.gif|none]]
                Program to demonstrate Switches and Leds
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  -----------------------------------------------------------------------------
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note:  
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1.Leds are  connected to PORTC
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2.Switches are connected to PORTA
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------------------------------------------------------------------------------*/
 
  
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= Downloads=
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Download the complete project folder from the below link:
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https://github.com/ExploreEmbedded/ATmega32_ExploreUltraAvrDevKit/archive/master.zip<br>
  
/*contains the definition of all ports and SFRs */
 
#include <avr\io.h>
 
#include "stdutils.h"
 
  
#define Switches PINA
 
#define LEDs PORTC
 
  
/* start the main program */
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Have a opinion, suggestion , question or feedback about the article let it out here!
void main()
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{{DISQUS}}
{
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  unsigned char SwitchData;
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  /*Configure the PORTA as I/p to read the switch data */
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  DDRC = C_PortOutput_U8;
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  DDRA = C_PortInput_U8;
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  while(1)
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    {
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  /*Read the switch position */
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  SwitchData =  Switches;
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/*Turn on the respective led depending on Switch position */
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  LEDs=SwitchData;
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  }
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  }
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</syntaxhighlight>
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=Video Tutorial=
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For those of you, who would like to watch instead of read we have made a video with all the gyan.
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<br>
+
{{#ev:youtubehd|-lNAmSNV2-Q|640}}
+

Latest revision as of 11:21, 19 April 2016


After blinking the leds, its time to control these leds depending on external inputs. In this tutorial we will interface a DIP switch to one of the Port's and display its status on LED's connected to other port.

Register Configuration

Please refer the below tutorial for basics of GPIO register configuration.

Code

Below points needs to be considered for this example.

  • Include the io.h file as it has the definitions for all the PORT registers.
  • Configure PORTA as inputs to read the switch status.
  • Configure the PORTC as Output to display the switch stauts on Leds.
  • Continuously read the switch status and display it on Leds.

LEDs and Switches Wiring diagram

Switch led AVR.png

Explore Ultra AVR Dev Kit

The Explore Ultra AVR Kit comes with all the things required, not just for this experiment but for the entire series. And even if you think of migrating to PIC or Arduino, you'll have breakout boards that fit on to this, hence we believe it is a great investment for learning hands on Embedded Systems. The kit is fully open source, you may use the schematics, the design files and all of the source code and build something cool on your own. And when you do that do not forget to share with us what you've done. We would be happy to see you building something cool.


Video Tutorial

For those of you, who would like to watch instead of read we have made a video with all the gyan.

0Switch LED AVR.gif


Downloads

Download the complete project folder from the below link: https://github.com/ExploreEmbedded/ATmega32_ExploreUltraAvrDevKit/archive/master.zip


Have a opinion, suggestion , question or feedback about the article let it out here!