Scrolling message display using two 'PIC16F84A' chips

by Roman P. Vaughan
(Auckland, New Zealand)

This message display was based on the dot matrix display in the project area on this site.

The reason I built it this way was because I had no 'johnson counter' so I got a second pic16f84a to act like one :P

The Letters a-z and numbers 0-9 are stored in an array. There is a second array containing the order the letters are displayed on the dot matrix and uses the binary left shift operator (<<) to move them to the left.

Project schematic

Scrolling message display using two 'PIC16F84A' chips
(CLICK to view pdf)
 PIC16F84A (16F84) Scolling led message display


Source code

Click to download zip file


Here's a video of the project in action:

Comments for Scrolling message display using two 'PIC16F84A' chips

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Sep 28, 2015
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asome
by: Anonymous

asome...
asome...

Jan 14, 2015
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16×32
by: Ajoy Chakraborty

I want 16×32 led scrrol masseg curcuit.

Dec 12, 2014
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program
by: sivakumar

sir, ur project is very nice but give me some tips on how to program these two pic microcontroller. and I am doing project in designing an arrow in the display.. plz give me some tips about coding for that. here is my mail id "siva_saratha@yahoo.com"

Oct 19, 2014
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hussein
by: hussein

hello hussein

Mar 29, 2013
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youness
by: Anonymous

is very good

Mar 04, 2013
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GUYS
by: Anonymous

can you help me how to write a running message using dot matrix led 8x8! Using the language of basic compiler in picSimulator!this my email.!jesue000123@gamil.com

Mar 04, 2013
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GUYS
by: jesue

Can help me how to Code running message in PicSimulator using basic compiler language!

Jan 28, 2011
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Good
by: PRADEEP

code is failed to program the PIC and .ASM also not building up Hex code My E mail - anshu.pkg@gmail.com

Nov 26, 2010
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what programming language
by: Anonymous

hello sir! i am now having my research study and i decided to choose this one. i just want to know if what are the programming languages you have used to run the message in the 8x8? and may i know if i can extend it to make it a LED PANEL DISPLAY? hope you will response for this one. i'll really appreciate your help sir, thank you...... my email ad is kiko_pellen@yahoo.com.............

Oct 03, 2010
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excellent .............
by: rinu

hello i have a request. pls give me the circuit and source code on how to connect it to a lcd display pls............. my e mail is rbm007@ymail.com

Sep 10, 2010
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about the .asm files
by: kuringmondu

what is the programming tool you used to program the pic16f84a?

i used the MPLAB ide v.8.53

i tried to load the .asm file in that programming tool but it failed.

please help me out...

giann_eymard17@yahoo.com

Sep 10, 2010
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about the .asm files
by: kuringmondu

what is the programming tool you used to program this project?...

i have seen your .asm file but it is not the same with the programming tool i am using.

i am using the MPlab ide... version 8.53


Sep 10, 2010
Rating
starstarstarstarstar
about the .asm files
by: kuringmondu

what is the programming tool you used to program this project?...

i have seen your .asm file but it is not the same with the programming tool i am using.

i am using the MPlab ide... version 8.53


Feb 28, 2010
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8x8
by: Anonymous

why your hex file cannot be burn to pic16f84a?
is it the real schematic and source code?

Jan 24, 2010
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help on schematic
by: sparky

could anyone please help with the connection of
8x8 led panel.please email me at pieter@contractor.net

Thanks

Pieter
South Africa

Oct 02, 2007
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Excellent Project
by: Valdir Lima

This project is very good.
Valdir Lima - Brazil. Brasilia/DF

Sep 03, 2007
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starstarstarstar
PIC as Johnson Counter... Great Idea!
by: circuited

I like the idea of a second PIC for a Johnson Counter and also that it can be sync'd with another PIC.

Using a PIC that has 2 ports (28 & 40 pin) I have run a series of interesting demos on YouTube with an 8x8 LED matrix. All programming using mikroBasic and connected directly to PIC without limiting resistors:


My videos On YouTube

Aug 28, 2007
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Mr.
by: ABE TOrkelton


Aug 23, 2007
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Innovative use of PIC
by: John Main

I was going to give it 4 stars as it doesn't make sense using two PIC16F84A chips but it's an innovative way of getting round not having a 4017 Johnson counter chip.



So it gets 5 stars for innovation!



Note: The use of one clock output fed into the other PIC chip which means they are both synchronized together. It saves a crystal here.

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