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Ooops, I thought you were asking about LCDs. Anyways, there are multiplexed LEDs, which use a lot less pins. I like driving the segments directly from the pics using BJT transistors. Maybe it's not the best way but it's simple and uses less components.
Robert
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I'm looking at maxim 7219 which I believe can drive up to 8 digits, 8 segments using only 3 pins (load,Din,clk) from a pic say RB0-Rb2 on a
16f84
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1339
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Hi archendekta,Originally Posted by revelator
You can buy an LED display that uses SPI or Shiftout commands on 3 pins from BRUCE at RENTRON, and others . . . http://www.rentron.com/SLED-C4.htm Or just buy the driver chip from him.Here is another brand from China.http://cgi.ebay.com/1-5-Character-He...3A7%7C294%3A50
and they can be daisy chained.
Last edited by Archangel; - 2nd April 2009 at 09:22.
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wow, a lot of great input here to keep me thinking and tinkering. my display looks like the one in "Byte_Butcher's" post.
my display: ltc-4727jr
my pic: 18f2620 i/sp #although i don't [have] to use this model
a friend dropped by a cd74hct138e 3-to-8 decoder saying it would help my pin usage issue. we'll see...
many thanks to all for your input. i'll study all the suggestions and links and see what i can do. thanks again for your time.
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