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Hi Gorgon,
That is not possible because for all 12rows I have only one set of shift register array. If I sent data for the 1st row to the shift register then for the second to i should sent another fresh set of data to shift register. What you had said is possible only when each...
Hi Klausst,
Thanks for explaining the procedures. I was rewriting the whole code and is half way but till now it seems to be promising both flicker free and much brighter (not brightest) than before. I will paste the code soon after the completion. Thanks again.
Im posting the code, It's quite amateur since im not perfect in C program.
#define F_CPU 20000000UL
#include <avr/io.h>
#include <util/delay.h>
/***************************************
Configure Connections
****************************************/
#define HC595_PORT PORTB
#define...
Thanks for the reply Fvm,
if you are talking about pin 13 it is ok. But how can pin 13 help my display flicker free. What is its purpose?
- - - Updated - - -
Thanks for the reply venkadesh,
I will send the code. The real problem with the code is the row will be activated only after sending...
Thanks for the reply all.
Hi burn and learn,
I am using ATmega16 microcontroller. I think it has SPI but I don't know what is it and how to use it.
The external frequency of the crystal is 20Mhz.
I also forgot to tell that I am using ULN2003 for rows to deal with the current issues. Please read...
Hi,
Thanks for the reply. Sorry, i have connected the latch (output enable pin13) to low for all the shift registers also i mentioned that row is connected to microcontroller columns are connected to shift registers. The 10ms is just an example it is not an actual value used. Thank you...
Hi,
I had developed an led sign board (120X12 it is quite lengthy) and its length is around 3 meters. I am using 74HC595 shift register for the columns and 12 lines from microcontroller directly to the rows. The problem I'm facing is my code is designed like the row is activated only after...
Chineese led display board link:
http://wap.ebay.com/Pages/ViewItem.aspx?nborh=http%3A%2F%2Fwww.ebay.com%2Fbhp%2Fled-display-board&emvAD=1024x800&nbpr=1&nbcol=1%7Cunknown&ebayref=/itm/3-75-Unit-Board-64-16-Dot-Matrix-LED-Display-Screen-F3-75-Module-Good-/171504962659
Onbon led controller...
Hi,
I would like to know how these Chinese led sign board is made.
1. How many rows of shift registers are used in a led board.?
2. Whether I can connect ONBON LED CONTROLLER with my home made led board with one set row of shift registers?
Thank you.
Hi KlausST, I've uploaded a circuit with this reply. Did u meant in a way I've drawn? If it is, when the switch is open from where do the OR gate will get the continues Vcc? The capacitor discharges only for few moments. Also using 74LS32 would be ok?
Thanks for the reply klausST, voltage should be 5V. I'm planning the reset by switching off whole circuit. Could you please suggest OR gate ICs compatible for this circuit.
Hi,
I need a circuit which will give output continue sly if an input is given only once. The input will be given only once but the output should start continue sly when it receives the input. Please help me.
Thank you.
Thanks for the reply fvm, bmigai, klauseST, but fvm, the display has the best brightness if the delay is 10ms ( takes one sec interval for each row scanning) . If it is an issue of current then it may not get this bright. I assume. I am trying to ad an internal interrupt ie: Sending data to...
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