ULTIMATE 64 x 256 PWM 8x8 LED MATRIX

http://circuit-ed.com
64 LED with individual PWM using an 8x8 LED Matrix. 64 LED's with 256 levels of light and differing period start times. Watch any single LED and see the level change. Driven directly by PIC18F452 @ 40MHz on 2 ports with no limiting resistors. Code written and compiled using mikroBasic.

Excuse the flicker... it's a cheap digital camera. All PWM is very smooth and flicker free.

Category:

Howto & Style

Tags:

• PWM
• LED
• 8x8
• Matrix
• PIC
• 18F452
• EasyPIC4
• mikroBasic
• technology

[bamboohaaa]

Tell me is it possible to make it with decoders and connect the first's enable pin to a single PWM source and therefore controlling the PWM of each LED?

[circuited]

Yes, you can build it with serial to parallel decoders. You would apply a PWM signal on the OE output enable pin of the decoder IC and it will dim the whole display evenly. Individual PWM like above must be done in software by controlling on-off timings for each bit/dot.

[bamboohaaa]

So you control each PWM for each LED dynamically?

[circuited]

Yes... and with only 16 lines!

[PicExamples]

Warren, with a little much effort you will display a TV picture ;-)

[circuited]

Hadn't thought about it but why not... 256 level grey-scale.

[cromo1074]

I wish you'd enviase this program in C language

[exonerator]

forgive me but i cant help but say you guys seem to be talking really complex stuff.. at least to me

[bamboohaaa]

Ahh thanks, I asked this question, because I want to control the matrix with the already built in CCP module.