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264 Threads found on edaboard.com: Led Matrix Pic
You need a microntroller, a RS-232 cable to establish a serial connection between the PC and microntroller and control the led matric display from PC using the microntroller or make the microntroller to control led matrix display intelligently by making some small program you uploaded to microntroller device itself.
One good book is this: (...)
Electronic Elementary Questions :: 26.08.2004 06:15 :: djalli :: Replies: 3 :: Views: 4131
well i made a led matrix studying many posts from this forum try 'search' u will get many specially this one
but i got the scrolling idea from this code
#include <90s8535.h>
#include
// led display
#def
Microcontrollers :: 03.09.2005 09:14 :: ful babu :: Replies: 3 :: Views: 4902
I've got a 8x5 led matrix, with common anodes and cathodes lined up. Now, of course, I can command it from a uc (like a big pic, 16f877) but it's not too bright, because the pic can't really source too much current, and it has to be multiplexed.
So, I want to build a power level for it, with transistors. Of course, we can (...)
Hobby Circuits and Small Projects Problems :: 12.09.2007 00:49 :: izua :: Replies: 1 :: Views: 1211
Hi leoren_tm,
I don't know exactly what do you want (what means the "dual Dot-matrix") but I'm attached here my old projects about this thema. These are using at89c2051 and 6 or 8 pieces of 7*5 led dot matrix modules. I think the 7*5 is enough but it's easy to modify the circuits and the programs to 8*8 matrix.
For this (...)
Microcontrollers :: 19.05.2008 17:05 :: zuisti :: Replies: 86 :: Views: 39639
ASA to ALL
im eorking on led matrix display consists of 16X16 led matrix can any body tel me what will the appropriate timmer1 relode value for this..... and why if you explain so i clear my concpts for scanning
your input will be highly apprictaed
thx
Microcontrollers :: 25.10.2008 17:53 :: drbizzarow :: Replies: 4 :: Views: 1164
im planning to make my own led matrix display which will be interface to the PC through parallel port.. I
PC Programming and Interfacing :: 19.01.2010 11:25 :: mayena_19 :: Replies: 5 :: Views: 961
i want to make big led matrix display but i dont know how to start
i know how to use pic .
pls can u help me ?
what is the standard siz of led matrix?
what alternative methodes do i have for making the display and what is the avantage and disadvantages of those methodes
tnx
Microcontrollers :: 28.01.2010 08:56 :: gere :: Replies: 0 :: Views: 463
hi all
i want to make big led matrix display but i dont know how to start
i know how to use pic .
pls can u help me ?
what is the standard siz of led matrix?
what alternative methodes do i have for making the display and what is the avantage and disadvantages of those methodes
tnx
Microcontrollers :: 28.01.2010 08:59 :: gere :: Replies: 3 :: Views: 2642
hello
i am about making led matrix project like mr ilker_32 posts here
but my problem is the short memory of pic 16f877a
i need help for using an external memory like 24c64 to save my text in it
and how to programe it via rs232 and how to call my messege saved into 24c64 and display it on m
Microcontrollers :: 04.07.2010 00:11 :: abdoupirat :: Replies: 4 :: Views: 654
Hi,
Before all, I'm not english, so sorry if my words are not correct.
I'm working on a led matrix display,
The code is wrote under MikroC pro.
The pic is a 16f876a,
I have, actually 3 matrix, each drived via a 74hc595, and used SPI protocole.
all is work fine.
Here is my problem,
I have an array contained (...)
Microcontrollers :: 12.08.2010 21:47 :: Hearty :: Replies: 13 :: Views: 3015
check this out.
CircuitDB | 7x7 Monochrome led Display .
Regards,
Jerin.
Microcontrollers :: 27.09.2010 07:58 :: incomplete_jerin :: Replies: 5 :: Views: 694
For a reasonable sum of money 64,000.00 INR (~1,000.00 EUR) I can supply you a fully functional working prototype of scrolling message display based on 5mm or 10mm leds which supports English alphabet. All you have to do is to contact me through private message.
Business, Promotions, Advertising :: 08.05.2011 21:30 :: ZASto :: Replies: 9 :: Views: 2019
Hi anoopmb24,
Yes, If you can write a character(say A or B...) on matrix (you have found the optimum scan-speed for X & Y) next step is completely turn off all leds of character; then turn them on by shifting one-column or one-raw.
Delay between that turn-off and on must be noticeable to naked eye.
You may experiment with variable time-delays to f
Microcontrollers :: 16.01.2011 13:31 :: DineshSL :: Replies: 4 :: Views: 927
you need a common source for current
proteus isnt so hard
i made these models you need in leds matrix
labcenter made a poor copy
do you need them #? pm me
Microcontrollers :: 16.01.2011 15:42 :: VSMVDD :: Replies: 50 :: Views: 7398
i want my led matrix in rows to be in cathode and columns in cathode? what appropriate transistors should i use in my columns and in my rows? if i use 74ls154 in my rows what transistors will use.. and in my columns 74hc595?
Microcontrollers :: 07.02.2011 17:13 :: cuber18 :: Replies: 19 :: Views: 714
Hello-
I am designing a 8x8 led matrix with RGB leds. So 192 leds altogether.
I want to control them using PWM so that I can have all of the colors.
I am going to use a pic with 5-8 PWM channels.
I am looking at some different led drivers from Allegra and also from ST Microelectronics. (...)
Microcontrollers :: 07.02.2011 21:15 :: Nora :: Replies: 0 :: Views: 569
how can a PNP transistor source current for a cathode row led matrix?
PNP transistor can only source current from the positive rail down, that is, it can drive anode row/column led matrix ..
The same applies to P-channel mosfets ..
IanP
:wink:
Microcontrollers :: 19.02.2011 12:56 :: IanP :: Replies: 65 :: Views: 2779
I am trying to build a circuit that will run an 8x8 led matrix. The data for which leds should be lit is stored in a 74HC259 8 bit addressable latch.
I think I have got the basic block level circuit worked out (see attached diagram). A binary counter goes from 0 to 7. This produces the address for which the 8 bits of data are stored in (...)
Hobby Circuits and Small Projects Problems :: 06.07.2011 18:42 :: Simon27 :: Replies: 3 :: Views: 1127
is there any led matrix pcb cirucits for as an example ?
PCB Routing Schematic Layout software and Simulation :: 14.11.2011 13:15 :: thannara123 :: Replies: 12 :: Views: 1544
I have another led matrix has 12x12 pin.
can you tell me how can i find connect this to a pic.
Hobby Circuits and Small Projects Problems :: 09.05.2012 00:58 :: Sallam :: Replies: 10 :: Views: 3174
I need advice how to drive led display with 16x80 leds. My approach is to connect anodes to 4-16 decoder 74HC154, and cathodes to MBI5026GF constant current shift registers. Refresh display is 100Hz, and characteristics of leds I have are 3.0-3.2V, max. 18mA.
According to datasheet, MBI5026 is enable to deliver max. 90mA per pin.
I (...)
Microcontrollers :: 24.04.2012 15:09 :: deniah :: Replies: 8 :: Views: 728
If you are scanning by rows (rather than columns) then you need to put your current liming resistor in the column (anode) path, otherwise the brightness of the leds will vary depending on how many are turned on. Since you are scanning by rows, it's the NPNs that must sink 11x20ma, not the PNPs, as would be the case for column scanning.
Microcontrollers :: 28.08.2012 15:58 :: barry :: Replies: 14 :: Views: 665
Hello guys,
This is my first post here, "plus" a newbie, so please be nice :P
So I have 64 White leds multiplexed. I tested my matrix by connecting each column to GND and +5v (from Teensy) to each row one by one "without resistor". All worked well.
Let me explain why without resistor.
Before making the matrix, I tested all the (...)
Hobby Circuits and Small Projects Problems :: 12.11.2012 10:59 :: aly.yousuf7 :: Replies: 3 :: Views: 539
The pic you want to use can drive up to 13 leds (13 I/O pins are available), but if you intend to use some I/O pins for other purposes you should use a led driver. A led driver is an integrated circuit that decodes an input code and outputs high or low (based on the code you send) on the pins used to drive the (...)
Microcontrollers :: 12.02.2013 21:16 :: T3STY :: Replies: 2 :: Views: 152
Hi
If anybody know any hardware details about the moving pannel display for led matrix, whcih displays graphics also. Is there is any character map generator IC? pl give the implementation details how can we address each led individually. I will be using 89C51 for the implementation of the project
Every suggestions (...)
Professional Hardware and Electronics Design :: 20.09.2002 22:37 :: viterbi :: Replies: 2 :: Views: 1726
check Dallas/Maxim.
There is a chip from led Dot matrix Controller.
You will get easy in programmning
Hobby Circuits and Small Projects Problems :: 12.12.2002 00:22 :: eYe :: Replies: 18 :: Views: 13636
i try to make a rotating text on eight 7x7 led matrix displays with two max6952 IC's
how can i connect a microcontroller to this chip
( PINS DOUT, CLK, CS, and DIN)
Link to max6952
Please give me a schematic with software
Microcontrollers :: 15.06.2003 16:32 :: The Puma :: Replies: 1 :: Views: 1028
Hello,
There are a couple of projects on this subject on the forums, just search for moving message display or led matrix.
However all of them uses a microcontroller of some sort. I don't think you can do it without one since it is programmable? Unless you use the PC parallel port or something like this.
Regards,
Gam
Hobby Circuits and Small Projects Problems :: 27.05.2004 14:41 :: gam :: Replies: 3 :: Views: 2467
Hello ,
im trying to work with a two digit 5x7 matrix led .can any one give links or help on how to work it with a pic16f87x series in C language
thank you a lot
Microcontrollers :: 21.01.2005 20:39 :: ZeleC :: Replies: 4 :: Views: 4584
You are going to have to provide more information
if you want anyone to be able to provide much help.
You can find all of the electrical specs in the datasheet.
How are you driving the led's? The pic is only good
for 50ma, so if you are trying to drive 4-7 regular led's
directly, at say 10ma, you're going to have problems.
I'm (...)
Microcontrollers :: 13.02.2005 23:17 :: Nick C. :: Replies: 4 :: Views: 815
Depending on what you want to do with these led's,
I would agree that addressing them in a matrix might
be the way to go. Or you could always go with several
cascaded SIPO shift registers, such as the 74HC595, but
the wiring alone would be a nightmare. :roll:
Yet another alternative might be a pair of MAX7221's.
That will give you cont
Electronic Elementary Questions :: 17.02.2005 23:52 :: Nick C. :: Replies: 6 :: Views: 1399
Hi,
Search Elektroda forum:
................
Microcontrollers :: 20.03.2005 18:10 :: hugo :: Replies: 9 :: Views: 3881
Hello boys,
Does anyone used the max6953 to drive 4 5x7 led matrix displays? I would be very grateful for some sample code to address the max6953 from a pic(16f84A). I have difficulties understanding the protocol from the datasheets.
Thanks
Nikos Geronikolos
Microcontrollers :: 28.03.2005 15:46 :: ngeronikolos :: Replies: 4 :: Views: 906
Hi all,
I'm building a 256 shades Monochrome led Display, it's a 55 x 35 leds matrix.
I intend to use xilinx CPLDs for row PWM generation, an atmel 8051 member uC runs at 33 MHz and a 512 KB RAM chip. I have some questions:
1- Do i have to calculate the frame animation at runtime or i can simply download the whole frames from PC into (...)
Microcontrollers :: 06.07.2005 00:18 :: Bus Master :: Replies: 52 :: Views: 14368
hi ,
it is not a technical problem ,
you have 12x8x8 = 96x8 dots which is your screen , now you should design different arabic fonts on it or if you are using few sentences , you can save them as a sentence not separate fonts .
you should show ( refresh ) them on the screen as you do with english , saving 010101101 .... in the program and out
Microcontrollers :: 15.09.2005 17:30 :: hm_fa_da :: Replies: 9 :: Views: 5118
include led for testing this board . such as blink program
Microcontrollers :: 23.08.2006 05:38 :: nooknikz :: Replies: 20 :: Views: 5690
Hi,
As far as I can see from datasheets you can replace 2 74hc595s and 2 ULN2803 by one STP16C596. There are two differences:
1. ULN2803 has greater current sink capability (500 vs. 120 mA)
2. STP16C596 has courent sources so that you don't need resistors in series with led's, and you can regulate currents through all leds by one resistor only
Hobby Circuits and Small Projects Problems :: 25.08.2006 18:40 :: pop48m :: Replies: 4 :: Views: 1671
Hi,
I use this software and hardware in my led message display. On original project text message is put in internal eeprom on pic16f628 and is limited to 128 characters.
I need help how can I implement external serial eeprom to enlarge number of text character.
I need schematis for connection serial eeprom to pic16f628 and please someone (...)
Microcontrollers :: 02.01.2007 02:02 :: pasicr :: Replies: 24 :: Views: 6984
Hello everybody
I want to make one project that support to my Master programme.
That project is pic (16F628A) accepts the every character from usb and display on the led matrix array .The character display is at least 10 character and more how to accept the character .
Can anyone help me and Thanks.
Microcontrollers :: 10.08.2007 12:49 :: nck :: Replies: 3 :: Views: 3681
when using my pic simulator. there are outputs. but in implementing my design, there are absolutely no outputs visible. what is the correct way to connect pin 1 of pic16f788? what about pin 11,12,31,and 32? what about pin 13 and 14?:cry:
Microcontrollers :: 10.09.2007 19:54 :: programmer143 :: Replies: 4 :: Views: 3695
Hello Friends,
I am a hobbyist, and enjoyed my time learning pic microcontrollers. I have developed a barely basic, pic training kit for my friends. This kit is based upon pic 16F628A @20MHZ, and comes complete with a training manual, and PROTON-BASIC lite compiler. The training manual takes you through all the steps, from installing the (...)
EDA Jobs :: 01.10.2007 20:32 :: ameriq :: Replies: 1 :: Views: 1570
Here's a brief overview of a large led display controlled by FPGAs. The article talks mostly about the controller, not the led drivers.
"Sign of the Times - Xilinx makes high-tech outdoor advertising in Times Square possible"
Microcontrollers :: 18.02.2008 05:47 :: echo47 :: Replies: 68 :: Views: 17554
Hello,
if this are led displays, you can use multiplexing. Segment current multiplies with the number of digits, you probably need drivers (can be simple transistor switches) for segments as for digits. To further minimize the number of lines, you can use an encoder for digit selection. But I see, that 877 hasn't enough pins even for a multiplex
Microcontrollers :: 27.01.2008 23:20 :: FvM :: Replies: 12 :: Views: 7001
Hi for all,
I use led driver (picture 1) drive led matrix 5x7 (one led is 5mm, picture I buy led matrix but larger with 2x5mm led (5x7, picture old le
Microcontrollers :: 30.01.2008 23:35 :: pasicr :: Replies: 8 :: Views: 5270
Hi,
Recently I got a gaming machine display board from ebay, It has 6 5x7 matrix ,32 bar graph led's and 4 MM5450 controllers. Is it possible to use these controllers with AVR or pic to make a moving display..? I am attaching the circuit and the picture of the pcb..
Thanks
Surej
Microcontrollers :: 19.03.2008 10:50 :: Surej :: Replies: 3 :: Views: 4515
Hello,
I've just designed an RS485 network. The network was successfully tested by connecting two PCs to the network using the Hyperterminal.
In the second step of my ork, my goal is to control 2 matrix led displayer from the PC. The 2 matrix led Displayer are connected to the Netwok via an interface RS232/485 and (...)
PC Programming and Interfacing :: 22.07.2009 16:05 :: mouzid :: Replies: 6 :: Views: 2471
>how do i interface an external eeprom to my pic
Descide how much storage you need
Descide how fast you need to read and write to the eeprom, eg some eeprom memorys take 10mS to perform a write operation which is too slow for some applications.
Read eeprom device datasheets
Decide if you are going to directly control the logic levels on all t
Microcontrollers :: 26.08.2009 19:11 :: throwaway18 :: Replies: 3 :: Views: 3487
sorry sir..actually i did not even draw my schematic out using any software.
i'll base on the source code to connect my leds
in my source code as i attach.. PORTB is GND
and PORTD is the output/vcc .
Microcontrollers :: 30.08.2009 15:47 :: edmondren_89 :: Replies: 4 :: Views: 1755
Hi edaboarders,
I do not really understand how to use the ULN2003a for my dot matrix project. The matrix led that I have is common anode, I connect the PORT B of my pic to the ULN2003. The output of the ULN goes to the row of the matrix, the PIN 9, of the ULN is connected to +5V and the PIN 8 to GND. (...)
Microcontrollers :: 11.09.2009 15:01 :: mouzid :: Replies: 2 :: Views: 1838
Hi
I like make a litle matrix with leds I think 10x10 whit pic18542.
this is my matrix:
A B C D E F G H I J
A
B
C
D
E
F
G
H
I
J
I need control pixel by pixel like AA,AB,AC, etc
for example AA is "output_high(PIN_B7);ouput_high(PIN_D7);" for after can make some imagens?
my question is how I (...)
Microcontrollers :: 18.09.2009 14:45 :: filjoa :: Replies: 2 :: Views: 591
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