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LED Matrix design issues

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scorrpeio

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Hello,

My only requirement to create LED rolling display is "cost effective".

I have got 256 LEDs, 12V, 2A supply, 74HC373, ULN2003 and 89V51RD2BN to design a LED matrix and a control ckt.

I think 16x16LED matrix would serve purpose with 2 ICs 74HC373 on Rows and 2 on columns all controlled by 89V51. ULN will not be used.

But, will 12V, 2A supply be sufficient for it? Also, can I drive 4 ics 74HC373 using a 89v51? I also have to use UART for programming and few pins for memory interface.

Please let me know, if I am thinking in right direction :idea:. Also, if anyone can suggest better design...he is welcome :p
 

The power requirement depends on the type of the led's you are using.

Most possibly the supply you have is enough for that.

Use a better powersupply, say 12v 5A for testing and measure the current at required brightness of the led's.
 
The LEDs I am using are 3mm LEDs which are locally available in mkt. As per my understanding, 20mA would be enough for all LEDs in series. That is why I though 2A would be enough. But, I missed the voltage rating :(

So, now dilemma is, which combination of Rows x Columns to use ??
 

Medtronic said:
do you want to use scan techniqe or not
Click to expand...

I am not sure, what is scanning technique but I guess, you are saying if I want to use Rows x Columns technique just like keypad matrix.
Yes...as I have to display letters and numbers onto it, scanning technique would be the only solution.
 

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