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valeryi
Joined: 05 Jun 2005
Posts: 18
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 12 Jun 2008 21:59 Re: DOT-matrix display(LED matrix) points for a good design. |
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OBIALOR
Joined: 12 Nov 2005
Posts: 45
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| 13 Jun 2008 12:16 DOT-matrix display(LED matrix) points for a good design. |
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| sohail,it seems you have good project on moving sign display for the forums...
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pcup
Joined: 26 Dec 2007
Posts: 91
Helped: 14
Location: India
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| 14 Jun 2008 1:31 Re: DOT-matrix display(LED matrix) points for a good design. |
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Please help me to drive using I2C communication this Single Colored Led 5x7 dot matrix multiplexed with MAX6953.
Thank you
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leoren_tm
Joined: 19 Dec 2005
Posts: 593
Helped: 19
Location: Silicon valley
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| 14 Jun 2008 7:09 Re: DOT-matrix display(LED matrix) points for a good design. |
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first constract the circiut...then...post it...maybe someone will help you code it..or i can help you..
Added after 1 minutes:
| sohail_akram wrote: |
| THis is bundle of moving message circuits and softawres |
ill try reading it...anyway..i already design one..ill post it out if its finish..
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wizardgrt
Joined: 16 Jun 2008
Posts: 2
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| 16 Jun 2008 23:42 Re: DOT-matrix display(LED matrix) points for a good design. |
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This is a little older solution for a dot matrix display, but it works. It is based on AT90s2313/ATtiny2313 atmel microcontroller. Hope you'll find it useful 
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wizardgrt
Joined: 16 Jun 2008
Posts: 2
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| 16 Jun 2008 23:55 Re: DOT-matrix display(LED matrix) points for a good design. |
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...and another Atmel DOT matrix display project...
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valeryi
Joined: 05 Jun 2005
Posts: 18
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| 17 Jun 2008 5:52 Re: DOT-matrix display(LED matrix) points for a good design. |
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| very good info thanks a lot
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leoren_tm
Joined: 19 Dec 2005
Posts: 593
Helped: 19
Location: Silicon valley
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| 21 Jun 2008 11:13 Re: DOT-matrix display(LED matrix) points for a good design. |
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| sohail_akram wrote: |
| THis is bundle of moving message circuits and softawres |
am i right? most of the program on your upload, are from this forum also...i think you just compiled it...correct me if im wrong..
thanks for the effort
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OBIALOR
Joined: 12 Nov 2005
Posts: 45
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| 21 Jun 2008 13:51 DOT-matrix display(LED matrix) points for a good design. |
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| hello wizardrt let me try to see ur file and if it is helpful ,that will be very good
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joet_x
Joined: 08 Oct 2007
Posts: 9
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| 23 Jun 2008 17:03 DOT-matrix display(LED matrix) points for a good design. |
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| nice design, i will try it.. but how we can update data from pc at external eeprom?
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electronicsrobotics
Joined: 18 May 2008
Posts: 8
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| 23 Jun 2008 17:51 Re: DOT-matrix display(LED matrix) points for a good design. |
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| why don't you look at www.electronicsrobotics.com as it has the best known solution
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syrax
Joined: 15 Sep 2005
Posts: 168
Helped: 7
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| 28 Jun 2008 9:42 Re: DOT-matrix display(LED matrix) points for a good design. |
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I think the best chip for that is MAX7219 - control 8*8 matrix with option for dimming the entire display
here in bulgaria this chip is about 7Euro but it is very good i waiting other chip for 16ch PWM the price is same )
regards from Bulgaria
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sohail_akram
Joined: 26 Feb 2006
Posts: 50
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| 01 Jul 2008 11:34 Re: DOT-matrix display(LED matrix) points for a good design. |
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YES YOU ARE RIGHT Mr.leoren_tm .
I just collect files form this forum and place here.
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viperpaki007
Joined: 02 Jul 2008
Posts: 39
Helped: 1
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| 03 Jul 2008 9:28 Re: DOT-matrix display(LED matrix) points for a good design. |
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I am unable to understand what do you mean by dual dot matrix.....but here i a link for 8x8 matrix circuit..i tried this circuit and it works well.....you can also use 74HC595 Serial in parallel out shift register to drive the colums as well but it will cause software code to be a little more complex...ULN2003 is used here for buffering......
url is http://www.elecproc.110mb.com/digital_clock.htm
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ihtashan
Joined: 16 Jul 2008
Posts: 4
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| 16 Jul 2008 15:36 DOT-matrix display(LED matrix) points for a good design. |
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Hi every one!
I am doing project which is display SMS on led dot matrix using AT89c51 microcontroller please help me
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yupng
Joined: 16 Jul 2008
Posts: 36
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| 17 Jul 2008 12:58 Re: DOT-matrix display(LED matrix) points for a good design. |
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anyone can send me DOT-matrix display circuit diagram.......tq
Added after 13 minutes:
anyone can send me DOT-matrix display hardware diagram.......tq
Added after 2 hours 14 minutes:
if i send data using keyboard via wireless (any wireless),then how i send and display it on dot-matrix display board?
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scottiehon
Joined: 21 Jul 2008
Posts: 1
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| 21 Jul 2008 16:01 DOT-matrix display(LED matrix) points for a good design. |
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i'm using 5x7 dot matrix led for fyp. bt why there is 10 pins on upper and bottom respectively? In other hand, 8x8 just hav 8 pins on upper and bottom?
Added after 8 minutes:
how to differentiate between common anode and common cathode?
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yupng
Joined: 16 Jul 2008
Posts: 36
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| 05 Aug 2008 7:36 Re: DOT-matrix display(LED matrix) points for a good design. |
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IF i use a keyboard to enter text then send it out via any wireless to the display board. How i send out the date from keyboard using wireless......
Anyone can help??
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leoren_tm
Joined: 19 Dec 2005
Posts: 593
Helped: 19
Location: Silicon valley
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| 05 Aug 2008 14:05 Re: DOT-matrix display(LED matrix) points for a good design. |
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| scottiehon wrote: |
i'm using 5x7 dot matrix led for fyp. bt why there is 10 pins on upper and bottom respectively? In other hand, 8x8 just hav 8 pins on upper and bottom?
Added after 8 minutes:
how to differentiate between common anode and common cathode? |
read the datasheets to find out the pinout...
or try testing each DOT
Added after 1 minutes:
| scottiehon wrote: |
i'm using 5x7 dot matrix led for fyp. bt why there is 10 pins on upper and bottom respectively? In other hand, 8x8 just hav 8 pins on upper and bottom?
Added after 8 minutes:
how to differentiate between common anode and common cathode? |
Comon cathode? just like regular led, where you put your + pr the ground
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polag
Joined: 13 Oct 2005
Posts: 32
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| 05 Aug 2008 14:27 Re: DOT-matrix display(LED matrix) points for a good design. |
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Is it possible to design a scrolling LED display without using shift registers?
Added after 5 minutes:
I actually want to solder the led matrix myself...
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leoren_tm
Joined: 19 Dec 2005
Posts: 593
Helped: 19
Location: Silicon valley
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| 05 Aug 2008 14:45 Re: DOT-matrix display(LED matrix) points for a good design. |
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| yupng wrote: |
IF i use a keyboard to enter text then send it out via any wireless to the display board. How i send out the date from keyboard using wireless......
Anyone can help?? |
use RS232..and connect to wireless module..
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yupng
Joined: 16 Jul 2008
Posts: 36
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| 05 Aug 2008 16:39 Re: DOT-matrix display(LED matrix) points for a good design. |
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| leoren_tm wrote: |
| yupng wrote: |
IF i use a keyboard to enter text then send it out via any wireless to the display board. How i send out the date from keyboard using wireless......
Anyone can help?? |
use RS232..and connect to wireless module.. |
can u explain more detail on this topic
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yupng
Joined: 16 Jul 2008
Posts: 36
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| 06 Aug 2008 3:38 Re: DOT-matrix display(LED matrix) points for a good design. |
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| how to send out the data from keyboard or PC (using any wireless) to the DOT-matrix display board with wireless connection??
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yupng
Joined: 16 Jul 2008
Posts: 36
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| 18 Aug 2008 13:08 Re: DOT-matrix display(LED matrix) points for a good design. |
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Anyone can help me do a "wireless announcement board" using dot-matrix.
The data(text) is send out from keyboard via wireless to dot-matrix display.
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leoren_tm
Joined: 19 Dec 2005
Posts: 593
Helped: 19
Location: Silicon valley
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| 19 Aug 2008 5:20 Re: DOT-matrix display(LED matrix) points for a good design. |
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| yupng wrote: |
| leoren_tm wrote: |
| yupng wrote: |
IF i use a keyboard to enter text then send it out via any wireless to the display board. How i send out the date from keyboard using wireless......
Anyone can help?? |
use RS232..and connect to wireless module.. |
can u explain more detail on this topic |
explain.....you can have a wireless module that accept RS232 signal from your PC(maybe you can use hyperterminal of your PC to enter the data from keyboard)..
search EDA, there lot sample project..it would be difficult to explain..cause i dont know, your KD(knowledge domain )...
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yupng
Joined: 16 Jul 2008
Posts: 36
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| 25 Aug 2008 14:17 Re: DOT-matrix display(LED matrix) points for a good design. |
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HELP.....wireless control announcement board using Dot-Matrix.
Any ideal.....
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leoren_tm
Joined: 19 Dec 2005
Posts: 593
Helped: 19
Location: Silicon valley
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| 26 Aug 2008 16:16 Re: DOT-matrix display(LED matrix) points for a good design. |
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| yupng wrote: |
HELP.....wireless control announcement board using Dot-Matrix.
Any ideal..... |
you will use PC or not??
PC----RS232----(max232)TTL---Wireless module Trasmitter(maxtrem)--Wireless module reciever---(UART)MCU--Display board
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yupng
Joined: 16 Jul 2008
Posts: 36
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| 26 Aug 2008 19:22 Re: DOT-matrix display(LED matrix) points for a good design. |
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| leoren_tm wrote: |
| yupng wrote: |
HELP.....wireless control announcement board using Dot-Matrix.
Any ideal..... |
you will use PC or not??
PC----RS232----(max232)TTL---Wireless module Trasmitter(maxtrem)--Wireless module reciever---(UART)MCU--Display board |
can use PC or dun use PC. Any type also can consider. See which one is easier.
How to connect the Wireless module Transmitter to PC port?
Really need help about this.
Thanks for any reply.
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leoren_tm
Joined: 19 Dec 2005
Posts: 593
Helped: 19
Location: Silicon valley
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| 27 Aug 2008 15:37 Re: DOT-matrix display(LED matrix) points for a good design. |
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First i would say..you need to research, its not that difficult..
you can buy module that are ready to receive RS232 signal, or it not you can convert that to TTL signal, which you could use transistor and resistor only, then the wireless module would be the one to packet your data, on any protocol to make it easier buy
a tranceiver(2) search on maxtreamm download datasheets and readm it is indicated on there documentation..i think it would be easier if you use a PC, cause you could use higher language on your interface and not a keypad matrix with another microcontroller..there are lot sample projects, but still you need to do some work...it could not be done by CUT-AND-PASTE method
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yupng
Joined: 16 Jul 2008
Posts: 36
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| 02 Oct 2008 2:43 Re: DOT-matrix display(LED matrix) points for a good design. |
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I am trying to build an Infrared Transmitter and receiver that will take an RS-232 signal, convert it into TTL, then Pulse Width Modulation would be applied, and then finally transmitted. On the reciever side, basically extracting the orignal TTL signal from the Pulse Width Modulated signal and converting it back to RS-232.
Anyone can give me some guidance about this project?
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