Seven Segment LED/LCD displays?

Does anyone know a good tutorial on how to use these? Thanks!

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westfw10 years ago
Exactly what do you want to do? There's not a lot TO a 7-segment LED display until you want to connect a bunch of them to microcontroller or something. It's just 7 LEDs with one common connection, and you control what it looks like by which LEDs you light up.

Parallax's "What's a Microcontroller" has a pretty thorough discussion in chapter 6.

An LCD display is more complicated because it needs to be driven with an AC voltage, but the principles are similar...
perkinsb1024 (author)  westfw10 years ago
I want to use two AAA to make it display a 5 It looks like they're attached in series inside, though, so I'm not sure how to do this with only 3 volts and without the chance blowing them out... Then I want to attach that to a 555 timer and make it blink about once a second. That's it. Nothing more, nothing less.
Then all you need to do is tie the positive (anode) lines of segments 1, 2, 4, 5 and 7 together. Then connect that to the positive output of your flash circuit and the Common line to the negitive output (or ground).
perkinsb1024 (author)  LasVegas10 years ago
But wouldn't that only give 3/5 V to each segment? And how would I use a 555 with that? I'm not sure how they work... can someone draw a quick schematic? Thanks guys
No... It would give 3 volts to each segment, but split up the available current from the source. The LEDs are connected in parallel.
perkinsb1024 (author)  LasVegas10 years ago
Well, I'm having trouble getting the 555 timer to work... can someone help me? I found a couple schematics, but they're pretty complex... I have a 220uF capacitor, two 3.3K Ohm resistors, and the timer... does anyone know where to go from here?
I found this circuit that should work fine with your 3v supply.
perkinsb1024 (author)  LasVegas10 years ago
Well, I just tried this, and it didn't work, I'm not saying it's a bad schematic, I know it's my fault... would a picture of my circuit be of any help at all?
Have you verified if the display lights with 3v alone? Are you using a 555CP? The CP indicates a CMOS chip that will run on 3v. Some variants of the chip require at least 5v.
perkinsb1024 (author)  LasVegas10 years ago
Actually I am using 5V now, well... I guess I'm not, I have a resistor to drop it to about 3V... I just got the only one RadioShack had...
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