To the two of you above: this thread is over a year old and the first thing he said was he cannot disclose how he did it.
(Above) Mike gave a good description of how it can be done. What needs to be explained further?
Hi Mike, Thanks for pointing that out. I read it through from start to finish and only noticed the date from the last reply. I realise he cant give to much info on the sign he made. I thought maybe a wiring diagram and basic code so that i could understand it better. I searched the internet a few months ago but only found projects wit AVR or in C . Im struggling with PICs and ASM. and dont want to switch over to anything else before mastering PICs.
"Mike did you manage to sort out the keypad code."
I am curious as why he did not drive 7 rows with the pic16f628a (7 outputs) and use 3 4017 chips as column drivers. (7x30)
All 4017 chips can use a common clock, and have individual resets to drive them and in sequence. (1 ck + 3 resets = 4 outputs of PIC)
Now you have used 11 outputs of PIC. Putting aside RA4 and RA5, you still have 3 more outputs that can drive 3 more resets of 3 more 4017. Turning this baby into a 7x60!
I welcome any insights.
Chip
I'm a manufacture of signboards.There is a very competitive market over here.That's why I cannot give the full details & techniques I used.Sorry for that.
It doesn't matter how you driving the displays.It can be used shift registers,johnson counters etc.......Finally all you need is to smoothen the display.
Another one did recently.......it uses latch shift registers.
YouTube - Signboard - Train.mov
Last edited by Gayan Soyza; 15th December 2009 at 01:44 AM.
[QUOTE=Gayan Soyza;823672]I'm a manufacture of signboards.There is a very competitive market over here.That's why I cannot give the full details & techniques I used.Sorry for that.
It doesn't matter how you driving the displays.It can be used shift registers,johnson counters etc.......Finally all you need is to smoothen the display.
Another one did recently.......it uses latch shift registers.
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Hi Gayan:
By all means my feedback was not to devaluate your hard work and long hours your put into this project. I understand what you tried to accomplish. Job well done and keep up the good work. I was just was sharing some thought.
I also understand there are many ways of implementing this project. I would have prefered CAT4016 LED drivers myself. But my posting was specific to use of 4017 and pic16f628a with minimal chips and cost as you were doing.
To add to your thoughts and giving you food for thought, you can easily turn the single LED's to RGB and use 3 pins of PIC to deliver the color across the board. A bit more complex. However if you can implement that then you are able to not only create different colors but also turn the project into a 3D sculpture.
Godspeed.
Chip
how to make led sign board 64x8 full circuit
Thats fair enough.Originally Posted by Gayan Soyza
I am slowly getting it together.
compliments on your work, Keep it up.
Hello
This guy explains a lot on ho to program a pic and use a Johnson counter http://users.tpg.com.au/users/talkin...y%20Index.html. Has some interesting stuff on his site.
gogo
I like the wheel the way it is.
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