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| Printing Image in GLCD |
Graphical LCD's known as GLCD are display devices which are capable of displaying graphical images, customized characters, etc. This paves way for any system to present information to the end user by means of interactive graphics. Bored of using the old 16x2 LCD displays, then you should probably try this one to make your projects more interactive.
This tutorial focused to teach you about printing a simple picture in this GLCD using AVR ( Atmega32) Microcontroller.
128 x 64 GLCD:
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| GLCD Pin diagram |
This GLCD consists of 128 columns and 64 rows in it which are divided in two equal halves. Similar to 16x2 LCD this LCD consists of 8 data pins from (DB0-DB7) and other control pins. Read the complete working of GLCD before you move into the coding section of this tutorial.
EXPLANATION:
We all know that every picture is made up of basic blocks called as pixels and we are going to use that to our desired picture in this GLCD. But this GLCD will not support any colors so we have to prepare the image before printing it into this Graphical display. Since this device only supports 128 x 64 resolution we have to resize our image into the resolution 128 x 64.
After that as i said before these LCD will not support colors, so you have to change your image have Monochrome Bitmap format and you will finally get a black and white image So your final processed image will look like the one below.
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| Monochrome image |
Now you have to assign the each pixel value into an array in your code which will make the image to print in your GLCD. Not to worry a tool known as "Graphic LCD bitmap generator" from Mikrocelectronica will help you to finish your job.
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| Snapshot of Bitmap Generator |
This is a screenshot taken of the Bitmap generator, all you have to do is load your processed image in this application and it will automatically generate the pixel values of the image give the output as array values as you see in the screen shot. You can also invert the pixels if you think that the picture is not good enough to be printed. Now you have to copy the code and place it in your source code of your microcontroller.
You can download the Bitmap generator application in the below link. Not to worry if it doesn't support for you, there are plenty of similar softwares available online.
CODE:
This code was built using AVR studio 4.
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NOTE:
- Replace the words "Your image pixel values" with the values your software have generated for your particular image.
- You can also draw image of your desire on this GLCD by calculating pixels for each block of this Graphical LCD.
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