As you'll see from one of the attachments, I have a mess of parts, wonderful "lab" and all kinds of fun stuff with the lab and didn't come with the lab. I've experimented with ATMega 328P-PUs, got some fun things working for it, but would like to try to make things from scratch that I could drive with it. I have a nifty IR LED with an IR sensitive photoresistor ("receiver"), I even have visual spectrum photo-resistors. I have cool parts and doo-dads, but I'd love to learn how to use them. I got 2 books that came with the lab, 1 book that I bought that i managed to get through (focused on digital circuits). I'm not really interested in AC, outside of making something to convert it to DC (actually, i'd rather not make something that i'd plug into the wall and ends up catching the house on fire).
Anyway, the bane of my existence and learning experience is these resistor color codes. I'm not color blind, but half the time i'm looking at these things, I can't tell yellow from red from orange, red from brown from orange, you get it. I've read other places that the paint jobs anymore are horrible, so it might not just be my eyes. I was hoping to try to gain some familiarity with it (or just straight up make a cheat sheet with contrastive resistors just so i can tell the colors apart) by using the resistor modes on my multimeter, but I don't know what the readout should look like. I also find it strange that everything is in terms of 2, but i'm not sure if I should be dividing or multiplying by 2 to figure out what my resistor is. I figure the black plug should be in "COM" but i'm honestly not sure which plug is should be using for which modes, nor do I know what all the modes are. I think the one mode is a diode mode, which seems absolutely pointless.
Honestly, I don't remember if the thing even came with a manual or not, but if it did, it got lost from all the moving of the parts constantly. Supposedly out of my resistor pack from Radio Shack, I have the following.
10 of 10?, 1k?, 10k?, and 100k?.
8 of 47?, 100?, 470?, 2.2k?, 4.7k?, and 1M?.
4 of 150?, 220?, and 15k?.
They're all 5% tolerance, so that's easy to identify.
Each of 5% tolerance. So, i tried to use that kind of power of deduction that the strips of 10 should be of particular interest to me and be the easiest way to identify what some of the colors are, right? As predictable, either my eyes are really bad, i'm doing this wrong, or the actual number of resistors is not what's printed on the package. Not a big deal for me, as i've bought this stuff a long time ago, but i'd really like to get over this hump.
So, I have a few questions (just to get my foot in the door, mostly):
1. For those of you who've done this longer than me, out of what was advertised, what combination do you feel to be the most efficient (fewest resistors displaying the most colors) that i could tape to a piece of paper to have a physical cheatsheet for dealing with various lighting conditions?
2. What should I set my multimeter to, and what should I expect to see, when looking for the resistors to question 1 (I probably don't need an exhaustive list, if it's alot of work for you)?
3. I noticed that my crystals froze the ATMega 328P-PU (Arduino CPU) when one of the capacitors comes undone (22?F, I think, as they just have "22" written on them). When i disconnected both of them from the crystal (16MHz) it worked again. I can't remember if i plugged it directly to ground or not, implying that the capacitors are not actually needed (i wasn't afraid of frying it or anything, since these chips are so cheap). Why is this?
4. Realistically, what is the problem with doing this?
5. Anything I can do with these to slow them down to 16KHz, or hook them up to something else to use them? I only have 11 ATMega chips, but I have like 50 of those crystals. I was curious if I could make an interrupt timer, buzzer, or something like that out of them, and how I would even go about it (maybe even something sensitive to the photoresistors or the IR detector).