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16  Using Arduino / General Electronics / Re: Damaged capacitor on UNO (board "working") on: April 15, 2014, 11:32:14 am
They are for supply decoupling. Without it the supply produces more noise, might oscillate and is more susceptible to interference. This problem is worse the more current you draw so you might well "get away with it" on a lightly loaded system.
17  Using Arduino / General Electronics / Re: Running super bright IR LEDs at 38khz off PN2222 on: April 15, 2014, 11:30:05 am
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And how is that going to help, another 6mA of collector current?
Well, I've seen this problem before, ...................
I can't see anything in that explanation that would account for it being a fix for anything. I find the terms turn off and rise time confusing in the open collector context.
Even if your explanation were true then according to you the LEDs would be on for too long ( slow turn off ) but as the OP says they look dimmer not brighter. They would look brighter if the turn off were to be too slow not dimmer.
18  Using Arduino / General Electronics / Re: Maximizing RFID Reader Operating Range on: April 15, 2014, 11:24:42 am
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Are there any benefits to tuning by varying the capacitance instead?
Only that it is easy to keep putting smaller and smaller capacitors in parallel.
19  Using Arduino / Motors, Mechanics, and Power / Re: Control moteur asynchrone with arduino on: April 15, 2014, 09:16:25 am
You can not make a variable frequency three phase supply out of a single phase supply without first turning it into DC supply and then switching that DC to make AC again.

What you are trying to do will not work, can never work and is not going to work.
20  Topics / Robotics / Re: Can the Arduino save values in the EEPROM memory when they are generated? on: April 15, 2014, 09:11:36 am
Do you not think that you are trying to build something here on little or no foundations.
Making a robot learn a maze is not a trivial problem yet you ask the most trivial questions. Not that trivial questions are a problem they are an essential part of learning but by the time you get onto an advanced task you need to have all this stuff under your belt.

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Why then in the code you sent me shall I store data after the if statement?
You don't have to that was just an illustration of what you might want to do and store stuff.

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Why I have to put EEPROM.write (0,21)
You don't.

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that if statement should go In the setup or in the loop
See what I mean, you don't have the basic grasp of how a program is laid out.

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Is the above the 255 (0xFF) message?
Yes 255 is exactly the same as the bit pattern 0xff - the 0xff means the number ff in hex.

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but now in an Arduino where I have never written anything in the EEPROM before:
Just because you have never written to it does not mean that there have been no writes to it. It could have been a factory test to see the EEPROM was OK in a finished arduino or anything.

You might be better putting a switch on the robot that indicates if you want to follow a path already in EEPROM or you want to forge a new path.

However I would do a whole lot more tutorials before you play about on your own.
21  Using Arduino / General Electronics / Re: Can code be a substitute for a resistor? (noob alert!) on: April 15, 2014, 09:01:09 am
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Dew knot trussed yore spell cheque or two fined awl missed aches.
Yep but if you are dyslexic you don't have much choice do you.

Oh come off it, do you not get the joke?
22  Using Arduino / Project Guidance / Re: Arduino multiple motor driver switch system on: April 15, 2014, 08:59:03 am
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1. I can control 6 H-Bridges on one Uno. = 12 motors
No but you can control 6 H-bridges that is 6 motors with 12 output pins, is that what you meant?

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2. I don't have to use the IC2 communication. (see below)
Correct

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3. I used the sketch with delay, so the Arduino can't control multiple motors together at the same time.
Yes you NEVER use delay if you want things to happen at the same time.

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I also have a brushless motor witch I assume isn't possible to control with the H-bridge
Correct.

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acting like a motor orchestra where every motor has it's starting - direction - pausing - stopping in any order.
Just hold on there.
Whole new ball game opened up which you did not mention before. This is very annoying, why do you do this?
Just what are you trying to do?
Turning a motor on fir a fixed time is not going to result in the motor having traveled the same distance each time or ending up in the same place.
You haven't even grasped how to drive a motor and now it seems you want to make it do something impossible.

So come clean and say what it is you are doing.
23  Using Arduino / General Electronics / Re: Running super bright IR LEDs at 38khz off PN2222 on: April 15, 2014, 08:50:01 am
Try using a pull-up resistor (i.e. 1K) connected from the 6V power to the collector. I suspect, at 38khz, the signal at the collector would have a fast fall-time but have a very slow rise-time.
And how is that going to help, another 6mA of collector current?
24  Using Arduino / General Electronics / Re: Can code be a substitute for a resistor? (noob alert!) on: April 15, 2014, 01:51:51 am
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Rhymes with "sync" ?
Homophone

Not that there's anything wrong with that.
As long as they are consenting adults.
25  Using Arduino / General Electronics / Re: Amplifying Audio signal for use with TIP31 power transistor and LED array on: April 15, 2014, 01:42:47 am
Several things puzzle me about this project,

How do you expect to drive a matrix from an audio signal, a matrix needs precicse signals driving coloum and rows?
Where does the Arduino fit in?
Why a TIP31? These things have a very low gain.
What do you hope it looks like at the end?

It sounds to me like a crappy instructables project.
26  Using Arduino / General Electronics / Re: Running super bright IR LEDs at 38khz off PN2222 on: April 15, 2014, 01:22:32 am
Try using only two LEDs you bill find the Vsat of the transistor is taking up a volt or so.
Check the transistor is the right way round, maybe post a photo correctly sized.
27  Using Arduino / Project Guidance / Re: Help with TDOA Arduino on: April 15, 2014, 01:10:32 am
Indeed it is a very difficult project dispite sounding easy.

Have you examined the sound on an oscilloscope? You will find that the signal from each channel looks quite different. For a start have you checked the phase from the two signals are the same.

Rather than a simple trigger you need to take a seriese of samples from both sources and apply a sliding correlation between the two to find the actual delay. I am not sure if the arduino is up to that due to the A/D speed you need.
28  Topics / Robotics / Re: Can the Arduino save values in the EEPROM memory when they are generated? on: April 14, 2014, 05:23:07 pm
Stick and wrong end.

You can write in the loop function but not every time round the loop only when data needs to be written, like when you find a new turning.

To test for any value use an if statement.

Erase is an odd concept in this context, writing zeros is erasing as is writing all ones in a byte.
There is no such thing as erasing memory always has to have something in it.
29  Topics / Robotics / Re: Can the Arduino save values in the EEPROM memory when they are generated? on: April 14, 2014, 01:10:00 pm
Yes no problem, just use the EEPROM read and write functions as normal.
Saving to EEPROM is not as quick as SRAM but it is in the few milliseconds range.
30  Using Arduino / Project Guidance / Re: First Post! L298 and L297 driver question... on: April 14, 2014, 09:09:23 am
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I discovered that there is no way to connect the three L298 drivers to the UNO
By definition you can not discover something that is not true.

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and that the L298s need an L297 connected between the Arduino and the L298.
Wrong again. The L297 is a chip that works with the L298 to make it into a chopping regulator. With the right supply and motors it is not needed to control a stepping motor.

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