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24466  Forum 2005-2010 (read only) / Troubleshooting / Re: problem with ArduinoBreadboard on: June 01, 2010, 05:23:31 pm
You don't need a LED, I just hold down the reset button, click the upload icon, then wait until the PC says Binary sketch size:, then count 'one' 'two" and release.
24467  Forum 2005-2010 (read only) / Troubleshooting / Re: problem with ArduinoBreadboard on: June 01, 2010, 09:53:12 am
It sounds like you haven't selected the right serial port or board type from the tools menu.
Basically what that error means is that the PC is not getting back the 'right' or any answer back from the arduino when it is being asked to boot.
The other thing to check is that the auto reset circuit is working. There isn't one on that link you posted and unless you are doing exactly the same as the page it won't work.

PS. I hate that site, it is educationally very poor and people often get into trouble with the stuff they produce.
24468  Forum 2005-2010 (read only) / Troubleshooting / Re: Analog output fine until I turn on the car... on: June 01, 2010, 09:56:16 am
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Reasonable size is?

100uF to 470uF
24469  Forum 2005-2010 (read only) / Troubleshooting / Re: Analog output fine until I turn on the car... on: May 28, 2010, 03:42:58 am
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I was thinking more of having it hooked up to the car and the arduino.
That is your problem. Try a separate battery.
24470  Forum 2005-2010 (read only) / Troubleshooting / Re: Analog output fine until I turn on the car... on: May 27, 2010, 07:36:42 am
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Your article does not explain what a choke or inductor
have a look at this:-
http://en.wikipedia.org/wiki/Inductor
It is simply a coil of wire on a ferrite core.
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I can't find anything specific to robotics
There is nothing specific about the application to a robot than anything else.

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When you say "supply decoupling lines" you mean the power supply lines to my sensor board
Anything that supplies power to anything. To be effective decoupling should be applied as close to the chip as possible.

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Kinda like a mini faraday cage
That is only effective if the interference is radiated, it has no effect on conducted interference.
One thing to try is to power your arduino and sensors from a completely independent supply like some batteries. Don't join the grounds together. If you still get the problems then it is likely you have a radiated problem. Then you can look towards screening and suppressing the causes of interference which in your case is likely to be the motor.
24471  Forum 2005-2010 (read only) / Troubleshooting / Re: Analog output fine until I turn on the car... on: May 26, 2010, 03:04:04 am
Have you tried adding inductors in the supply decoupling lines with a capacitor on each side.
The value 47uF is not vital anything over that will do just as well.
24472  Forum 2005-2010 (read only) / Troubleshooting / Re: Analog output fine until I turn on the car... on: May 21, 2010, 06:15:23 am
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Do they mean each board should be decoupled
Well the they is me.  smiley-wink

For best practice it is every chip but it is not necessary to immediately go for that. The arduino has some decoupling on already so I would concentrate on the sensors first. Unfortunately there is no magic bullet so if you try something and it doesn't work then you have to try a more robust form of isolation.
Look to add decoupling on the sensors first, then if you still get trouble the arduino board. Then look at how the ground is connected. It might be that you need to run a pair of wires to a point and not rely on a chassis ground return.
This is the bit of electronics that is more of an art than a science. If capacitors alone won't work the you have to go further and add inductors.
24473  Forum 2005-2010 (read only) / Troubleshooting / Re: Analog output fine until I turn on the car... on: May 21, 2010, 02:32:21 am
The problem you have is with power supply decoupling. Cars are very noisy environments electrically speaking and you need to isolate the rails.
http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html
24474  Forum 2005-2010 (read only) / Troubleshooting / Re: Servo hum on: June 01, 2010, 04:34:28 am
No I'm just getting better at resisting.  smiley-wink
24475  Forum 2005-2010 (read only) / Troubleshooting / Re: Servo hum on: May 28, 2010, 05:54:33 am
Good.
And finally I can't resist any longer.

Why do servos hum?

Because they don't know the words.
24476  Forum 2005-2010 (read only) / Troubleshooting / Re: Servo hum on: May 28, 2010, 04:03:54 am
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Why do I need to common the grounds?

http://www.thebox.myzen.co.uk/Tutorial/Power_Supplies.html
24477  Forum 2005-2010 (read only) / Troubleshooting / Re: digitalWrite() HELP!!!! Wrong Voltage! on: June 01, 2010, 04:22:44 am
Also if you haven't put in that resistor on each of the display segments you are frying your output pins even though they appear to wok.
24478  Forum 2005-2010 (read only) / Troubleshooting / Re: digitalWrite() HELP!!!! Wrong Voltage! on: May 27, 2010, 10:41:30 am
Yes Jim but 0.3V is going to be too low for an LED without a resistor. Even an output going directly into a base will give 0.7V unless you have germanium transistors and I haven't seen one of those for years.
24479  Forum 2005-2010 (read only) / Troubleshooting / Re: Arduino triggers all pins at powerup on: May 28, 2010, 06:27:16 am
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think that the problem lies with the current that passes through the optocoupler to arduinos gnd. Too much?

No that's wrong.
24480  Forum 2005-2010 (read only) / Troubleshooting / Re: Arduino triggers all pins at powerup on: May 26, 2010, 08:01:53 am
So it is not a problem with the arduino itself but your external drivers. You need to post a schematic of what you have in order for us to help you from here.
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