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16  Topics / Robotics / 14 wire stepper motor on: July 24, 2012, 08:18:57 pm
I have a stepper motor from a Canon scanner. I have had no luck googling up a datasheet or any info on it. I'm not so much worried about the pinout, as that is easy enough to figure out with a multimeter, but I'm unsure about voltage and everything else. Plus it would be nice to have a datasheet. Is there some secret datasheet hideout I could check?

The numbers on it;
17  Using Arduino / General Electronics / Re: Building a powersuply from an old computer psu on: July 12, 2012, 01:50:35 am
I found a potential polarity candidate. I'll see what any of you guys come up with before I say.

18  Using Arduino / General Electronics / Re: Building a powersuply from an old computer psu on: July 12, 2012, 12:34:30 am
That's why I asked. I was thinking it would be as easy as a voltage doubler on a 12V rail, but then I started thinking about some of the stuff you were saying. I was just trying to think of things i could do to it just for the experience of it, but I don't want to spend my time building shit, either. As it turns out, there is plenty to do just converting a computer psu to a benchtop powersupply. I have made one of these before from a cigar box, but it was just hacked together quick and dirty. I used it for quite a while and it never let me down, but this one is gonna be pretty nice.

I have one more power supply question, though. What is the proper polarity for the power cord? I don't see anything about c14 and polarity. I know it's really the device that will mind or not, but I want it wired the way it's supposed to be.

I said no more power supply questions, but I do have a mystery. I was just going to use my meter and check the cord, then it would be easy enough to tell how the male part should be. When I put my test leads in the end of the cord it blew the 8a250V fuse. I switched the positive lead over to the 10A jack before I did that, I usually don't. I can't help but think that had something to do with it. I felt a buzz as soon as I got both probes in there and I immediately snatched them back out, but it was too late. The cord works fine powering a tattoo machine powersupply, so I doubt the cord is faulty. I have never had that happen to me. Any advice what I did wrong?
19  Using Arduino / General Electronics / Building a powersuply from an old computer psu on: July 11, 2012, 01:06:45 am
How hard would it be to add a low amperage 24V rail? I was thinking of a switch that would disconnect every other rail when ever you turned the 24V rail on. Max output is listed at 480 Watts.

I know that it's not arduino related, but it kinda is as this is to power my projects.
20  Using Arduino / Sensors / Re: Open Energy Monitor-Something's not right on: July 05, 2012, 11:01:50 am
I've seen the blue smoke before. However, at this time I do not have extra microprocessors, so I have to be really careful. I have a lot going on today, but if I get the chance I will take a pic of my breadboard. Maybe somebody will see something wrong. Worth a shot.
21  Using Arduino / Sensors / Re: Open Energy Monitor-Something's not right on: July 04, 2012, 05:48:46 pm
Yes sir, I'm using both. Would you like a pic of my breadboard? I thought I addressed all the mistakes in my schematics, ie things that aren't like I have them on my breadboard, but I guess not. I really need someone to look at the project page, then my schematic and tell me what's wrong, and then I'll build it like the schematic, rather trying to match a picture, which is what I've done. But the mistakes you point out are not mistakes, I have exactly like you say. Like I said, I'm trying to follow the instructions as closely as possible.
22  Using Arduino / Sensors / Re: Open Energy Monitor-Something's not right on: July 03, 2012, 04:41:28 am
Thanks for the replies, guys. I could not keep my eyes from crossing last night lol. None of this project has been engineered or calculated by me. I'm, following the instructions found at the link I posted as closely as I can. I ordered the parts they said to order, down to doing copy pasta on the item numbers. I can't imagine why my hardware would be any different at all, or why anything would be different. For the CT power supply I am getting that from the arduino, 5V, unless there is something I am not understanding about the way this is all wired together, which it's safe to say that I do not. I am afraid now that I'm going to do something to smoke my arduino. Not having a schematic that I trust is about to make me just buy an energy monitor since I can't stand the thought of seeing the blue smoke.

The burden resistor I am using is 33 ohms. It is what the project page recommended if using 5V. I have to finish this or buy one since I need to begin auditing my energy use in preparation to install solar. I would much rather finish it. I have attached a pic of the front and the back of my CT. I hope that helps. Thanks for the help guys!

23  Using Arduino / Sensors / Re: Open Energy Monitor-Something's not right on: July 02, 2012, 01:27:42 am
I would appreciate if anyone could make sure my 3 grader level schematics are accurate. I'm just going to start over before I try troubleshooting this thing.

Here's the pic I am going by

And here are my schematics.

**Edit** The pin number is wrong in the power supply schematic, it goes to 2, not 1(doesn't matter but I figured I'd say I did see that). Also I deleted the entire post and changed it to this. If I could verify the schematics I think I could trust it enough to figure it out.

Edit Edit I somehow renamed one of my drawings the wrong thing and they are both the same drawing, just different names. I'm sorry for being such a spaz tonight. Been up for way too long and getting tired. Don't see a way to delete the attachment. I'm sure I'm just missing it.

Edit Edit Edit Here is the right one for the powersupply, I THINK. I'm going to bed now lol.

24  Using Arduino / Sensors / Open Energy Monitor-Something's not right on: July 01, 2012, 08:50:20 pm
I just built the Open Energy Monitor(, and something seems off about the numbers. There are two things I feel could be contributing factors that I should mention first. First off, the CT sensor I have is the SCT-013-000, the one recommended by the guide I linked, which I assume to be the "official" project page for this. By all indications it would seem that this particular CT sensor needs a burden resistor in order to function properly. The only reason I even question this is when I unscrew the cover from the 1/8" jack and test the connections with my meter I get a 200 ohm reading between the lead that I'll call common(the one that is attached to the largest part of the jack, usually ground on a headphone or audio jack) and the other lead, the one that goes to the tip. I know it has a diode installed, maybe that's why I'm getting that, or I thought it could possibly be a pre-installed burden resistor, but the value is too big. in other words, both leads are already tied together somehow with 200 ohms, is this the way it should be?

Secondly I have been unable to find a schematic. All I have to go by is the picture on the page I linked. I know there is a schematic somewhere, but I haven't been able to find it. Would anyone happen to know where one is? I'd feel a whole lot better about the wiring if I could just look at a schematic.

Btw, I do have the right power adapter, 120VAC to 9VAC, if anyone should be wondering. Below are a handful of the values from my serial monitor. The values, from left to right are; real power, apparent power, power factor, rms voltage and rms current. The extreme range of the real power value is mostly what looks wrong, but the others are fluctuating pretty widely as well, but nothing like real power. I should probably mention as well, that this was the maiden voyage with the Open Energy Monitor and just to see it work I put the CT sensor on my laptop's power cable. Not sure if that would cause this ridiculously wide variation in values, but it is worth mentioning.

6.98 33.78 233.25 0.14 0.21

4.06 30.44 233.13 0.13 0.13

7.57 36.91 232.99 0.16 0.21

0.42 29.95 231.97 0.13 0.01

0.68 34.87 233.18 0.15 0.02

1.95 26.99 232.97 0.12 0.07

5.15 32.39 233.07 0.14 0.16

4.17 30.94 233.17 0.13 0.13

4.34 31.37 233.01 0.13 0.14

0.50 29.88 233.24 0.13 0.02

3.35 30.19 232.07 0.13 0.11

2.51 21.46 233.03 0.09 0.12

4.26 27.67 233.24 0.12 0.15

4.30 28.34 233.20 0.12 0.15

1.65 28.18 233.05 0.12 0.06

2.02 25.13 233.06 0.11 0.08

5.69 33.19 231.96 0.14 0.17

1.63 29.89 233.07 0.13 0.05

6.24 29.78 232.89 0.13 0.21

2.06 27.65 233.05 0.12 0.07

4.20 28.76 232.96 0.12 0.15

0.32 25.79 233.21 0.11 0.01

4.84 31.68 232.03 0.14 0.15

4.61 32.97 232.99 0.14 0.14

7.24 32.40 232.99 0.14 0.22

1.30 26.35 232.81 0.11 0.05

4.29 29.58 231.89 0.13 0.14

4.26 41.10 232.83 0.18 0.10

3.20 30.32 233.10 0.13 0.11

Any advice, clues, rtfm with a link, anything would help. I'm mostly worried about the 200 ohm resistance where I expected no circuit at all.

Thanks guys.
25  Using Arduino / Project Guidance / Re: Is my project feasbile? on: June 24, 2012, 01:01:06 pm
I ask because if they are big enough there may be other, arduino-able, ways to do it. You could detect a 1mm with regular ol ir I bet. You could also think about repurposing a rangefinder maybe??? 1mm is a pretty big crack. Hairline stress fractures are really the ones I would think you want to find. Don't suppose you have an old Xray or mammography machine laying around? Anyway, just some incoherent ramblings of a random internet troll.
26  Using Arduino / Project Guidance / Re: Is my project feasbile? on: June 23, 2012, 09:10:56 pm
OP, what's a rail track? What's it made of? What size are the cracks potentially?
27  Using Arduino / General Electronics / Re: Teach me how to USE Ohm's law on: June 23, 2012, 03:42:26 pm
Good info, majenko, I'll have to chew on that for a minute. Fwiw, I'm powering two servos that want 5V and an LCD that wants 5V. I tried using a tattoo machine power supply set to 5V, but the LCD flickers and the servos jerk around all spastic like. I have to assume this is because the power supply needs to be forked so the LCD has a solid steady source and the servos can pull what they need when they need it. I don't wanna just buy my way out of it. I wanna use this to learn how to get X volts from Y volts supply. Your post will no doubt help me work through that.

Thanks again!
28  Using Arduino / General Electronics / Re: From breadboard to perfboard on: June 23, 2012, 11:36:14 am
I have wondered many times how in the hell people can design complicated layouts. I am a Linux user, and have used the gEda package before. Anyone have any tips on using the layout tool in gEda? Will it actually help you decide the best layout, or is it just a glorified autocad for circuits? I have never even tried it since I have only taken one project from the breadboard to pcb and I just jumpered all the connections because I could not wait to have a working unit. Next time I'd like to do it right.
29  Using Arduino / General Electronics / Teach me how to USE Ohm's law on: June 23, 2012, 11:16:21 am
I know Ohm's law, have since I was 2. But, I don't know how to use it. All my experimenting life I have sought out the power supply I need, rather than make due with what I have. Well, no more. I need a power supply, 5V. I have all sorts of wall warts and old lappy bricks.

How do I get 5V from say a laptop brick that is rated 19V. I know it's a stupid question, but I can't be the only learning disabled one here.
30  Using Arduino / Project Guidance / Re: Three way servo control on: June 22, 2012, 07:58:02 pm
Thanks guys. I'll let you know how it goes.

Anymore ideas, just spit it.
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