OY2L
Member
Another great 16F628 project at this link 15x7 DISPLAY
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I'm currently tinkering with something kind of similar. I have an 18F2550 controlling one bi-color (red/green) 5x7 LED matrix (like the one at the top there, but red/green). It uses a 74HC4017N to handle the multiplexing for the 10 columns.Another great 16F628 project at this link 15x7 DISPLAY
Heh. More like 1-3/4" tall. Everybody seems to like that thing.I saw that, it must be 2-3 inches tall
You probably already know, but you can get those from **broken link removed**. The heat sinks you have to source yourself though.OMG those pictures are great (and the supplies )
Ya, my heatsinks aren't necessary. I just like them.I have used this homebuilt supply on my Breadboard for a long time and never need a heatzink at all, never get that hot,
Diode protection is probably not a bad idea in these kinds of supplies, the safety factor should outweigh the wasted power from the diode drop.
I'm currently tinkering with something kind of similar. I have an 18F2550 controlling one bi-color (red/green) 5x7 LED matrix (like the one at the top there, but red/green). It uses a 74HC4017N to handle the multiplexing for the 10 columns.
In this pic I'm still missing two transistors (2N2222A) and haven't wired the 14 rows to the PIC yet.
**broken link removed**
Wow! That's a ton of wiring!Nice project you have reminded me I have got a corker of a future project, a board out of an old fruit machine with 36 5x7 display modules complete with some logic circuits to run the thing, must be serial data in but not sure how yet. I must attempt to work it out some day!
Surely in this case the only way you could give effective protection would be by putting a reverse biased diode across supplies (to negative) and therefore shorting the supply or am I missing an obvious solution here?
How about permanently marking the breadboard for a particular orientation?
Wow! That's a ton of wiring!
I started out with two displays, but soon realized it was going to take all of those two breadboards just to fit the wiring for one. And it's not gonna be pretty!
Yup. I didn't buy those from Futurlec though. I bought the 5x7 red/green's at **broken link removed** for $1.12 each (bought 8 to get the discount).Did you see the 8x8 matrix LEDs on the same page?
Only in my head so far.Do you have a schematic?
Unknown. I've only ordered from Futurlec once.Time to order a bundle of stuff from Futurlec, are the component bundles (e.g. transistors) any good? Or should I order a bunch of separate ones?