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I've been told 15-20 is the max you can reasonably multiplex. After that, you don't have enough time to hit a suitable refresh rate
Yeah, I don't see any issues with it either. That's what I'm trying to figure out. I mean, if you design with a smaller resistor vs. a larger resistor, do you...
Hi! :)
You said that the time each led is on depends on the number of leds. It seems that it also depends on the amout of brightness you want. It may seem silly of me to ask, but is it usually a given that you design around getting the maximum brightness? Also, let's say you made a design...
Thanks rkidaira.
What are some general rules for what size resistor to pick. Is it better one way or the other - longer on time, bigger resitor vs. shorter on time, smaller resitor? Should you always try to have them on as long as possible and design around how many are multiplexing? Either...
Regarding multiplexing LEDs, I've been learning a little bit about refresh rate and duty cycle. If you want to turn on an LED for a shorter amount of time each cycle and/or keep it off for a longer time, I've been told that you need to supply more instantaneous current . So do you alter how...
Hi everyone.
I want to make a LED grid to print custom messages and graphics. Let's say it's 128x64 for now. What are the limits of how many I can multiplex on the same circuit and how do you do that? All I know so far is how to do it with 7seg displays. How do I control so many circuit...
Re: Where to buy hardware parts? (levers, springs, buttons,
I found another place called Cherry: www.cherrycorp.com
Some nice pieces there.
There's gotta be some more places, right? What place do you know of? Tell us what you know.
Re: Where to buy hardware parts? (levers, springs, buttons,
Thanks Sceadwian. I just checkout out their website. BTW, I found a link on their website to download the catalog (it's a .pdf).
Hi all.
I am looking for a little direction and maybe someone can please help me. I am getting into control design. Where are some good places to buy parts such as springs, levers, spring loaded levers, buttons, switches, battery holders, etc. (eg. parts for things like a MIDI keyboard...
I was hoping to get a little more input on the development systems.
Can anyone else attest to the Mikroelectronica development systems? I was looking at EasyPIC3 and that looks pretty nice. What about the ones at Microchip? Anyone know of other companies selling development systems? Any...
I decided I was going to learn how to do this stuff about 2 weeks ago. I've had to decide what chip to program for. I've read a little in these forums, talked to some people who work in the field, and researched the web. My conclusion (based on me being a beginner and having a few ideas of...
randika -
Thanks for the suggestion and the link. I've heard conflicting things about which chip to start on. Some say 8051 and some say PIC. I'd figure it out either way, so now I'm thinking that it's better to get the best design kit. I've seen some cool proto/develeper boards with...
8051 vs. PIC
I am just learning about microcontrollers. There seems to be 2 main types talked about: 8051 and PIC. What are the similarities/differences? Is one more suited for certain types of applications over the other?
First off, hello everyone. This is my first time here.
I am working on my first project and I need some direction please. I want to use an 8051 microcontroller which controls a 7 segment display and have one button to start/stop things, etc. I figured this would be a good starting point. I...
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