# How hard would this be to make?

• posted

I got a bit of a weird request for circuit people out there. I want to make a display out of LEDs. I'm not sure of the size of the display as of yet, but I want to be able to program the LEDs to blink in a random fashion, scroll text across them, or a combination of that. How hard of a circuit would this be to build, and what would be the best chip to program from my computer? Thanks in advance.

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• posted

make

- put the leds in a matrix

- use a microcontroller for the sequence (needs "calculation" in case of text)

- control them at rather high frequency, so ni flickering occurs

or just buy an existing module... :-D

• posted

yet,

my

I was thinking of buying an existing one but do they make them in a 5 x 19 LED size? How would I go about making a matrix for the LEDs and what type of microcontroller would you suggest? Thanks.

• posted

fashion,

circuit

from

of

don't know what sizes of display exist, I think many varieties do try googling for it

using an electric matrix of 8x8 lines gives 64 possible led's this only uses 2 processor ports directly OR using addressable latches only uses one processor port and one address decoder using 2 8-bit latches gives you again a matrix of 64 leds the controller to be used can be any kind but must have enough ports

- at least 1 if using addressable latches or

-(number of leds)/64 * 2 ports if controlling directly (=this number is identical to the number of latches if used) and enough calculation power to do the job the needed power of the controller is related to the number of leds to be connected since they must be calculated to be on or off and to create a smooth image if moving

principle of the leds: (2x2 lines depicted)

B1 B2 | | | | A1 ---+--------+----- \ | \ | \| \| + + A2 ---+--------+----- \ | \ | \| \| + + | |

all leds are connected as the diagonal lines are drawn all leds arranged in same polarity (direction) so 2x2 lines gives you 4 led's to control (and one half port or latch to be used)

• posted

This doesn't seem all that hard to do. Do you know of a website that shows this in more detail?

to

19

type

be

• posted

be

examples:

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or just take google, search for led + matrix gives about 4million results :-D

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