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16  Using Arduino / Project Guidance / Re: electronic abacus on: Today at 03:26:24 am
You are wrong in all respects with that answer.

If you don't want to know then don't ask the question.
17  Using Arduino / General Electronics / Re: The important of calibration of oscilloscopes. Or not? on: Today at 03:24:16 am
A scope is the only way to measure pulsed voltages or the time of non repeditave pulses. So if you need to measure these things, which you do a lot then a scope is the only way.

For example how can you measure the baud rate of an aysynchronous series signal without one?
18  Using Arduino / General Electronics / Re: Individual servo control using flex sensor readings on: Today at 03:19:14 am
You could have edited your original post you know. Even on an iPad.

Why are you using two Arduinos, ther is no need you are just making things more complicated for you.
You have no way of sorting out what number corresponspds to servo with the code you have. You can do this in many ways.
1) send all the readings in a packet with a header and end of packet marker.
2) tag individual readings with a alpherbetic prefix
3) send the data as two hex bytes as each reading is only 10 bits, and use the empty bits to tag each byte with a unique bit pattern.
4) Best of all just use one arduino
19  Using Arduino / Project Guidance / Re: HELP! Project on creating an all-in-one tuner on: Today at 03:10:04 am
The hard / almost impossible bit is getting the octave correct.
This is because the strongest harmonic is not always the fundamental.
20  Using Arduino / Project Guidance / Re: electronic abacus on: Today at 03:07:31 am
You need to look at the transition of a button state not the level. So you compaire the button state with the paste state and only do something when the passed state was unpressed and the current state is pressed.
Look at the state change example in the IDE examples menu.
21  Using Arduino / Project Guidance / Re: Asking Arduino to do too much? on: Today at 03:04:39 am
Well if you are just asking if it can be done then sure that is no problem.

A few notes.
If it were me I would use FETs instead of relays. It sounds like the discharge is going to have high current and relays being mechanical will ware out.
Rather than pulse discharge the battries I would continuously discharge them. With pulse discharge you are giving the battery time to recover and that does not reflect a real life situation.
22  Using Arduino / General Electronics / Re: Individual servo control using flex sensor readings on: Today at 12:36:58 am
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The proble is strictly in the programing
I doubt it.

Read the how to use the forum sticky and post that code correctly.
23  Using Arduino / General Electronics / Re: Ohm's Law. on: Today at 12:34:32 am
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There really no crap it's simple ADC
Looks like it to me.
Either you missunderstand things or your language skills are not up to explaining the situation.
That last post was nothing to do with " waves of power" what ever that means. An ADC measures voltage not power.
24  Using Arduino / General Electronics / Re: Issues with sensors and external power on: September 01, 2014, 04:28:17 pm
The issue could be any power supply.

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Since the PCB is already printed, this could get interesting, trying to cram a bunch of caps in there...
Use surface mount caps, you can solder them between pins of a 0.1" pitch chip.
25  Using Arduino / Sensors / Re: A lot of flowsensors on: September 01, 2014, 04:19:49 pm
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But port expanders are pretty slow, aren't they? Don't most of them use I2C?
No and no.
Most of the ones I use are SPI.
26  Using Arduino / General Electronics / Re: Ohm's Law. on: September 01, 2014, 04:10:22 pm
Sorry I have checked and it is not April the first so why all this crap?
27  Using Arduino / General Electronics / Re: Issues with sensors and external power on: September 01, 2014, 03:23:18 pm
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and I'm wondering if all those resistors hanging off of the 5V out on the Arduino are causing problems.
Have you measured the 5V? Is it sagging.
What about your decoupling?
http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html

It is time to fault find by measuring what happens to the voltages rather than just saying it does not work.
28  Using Arduino / General Electronics / Re: Laser Woes on: September 01, 2014, 03:19:22 pm
Start here
http://www.thebox.myzen.co.uk/Tutorial/De-coupling.html
29  Using Arduino / General Electronics / Re: Electrical connection plugs for project on: September 01, 2014, 03:04:25 pm
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My intention was to use something like the circular pin sockets on many electronics devices, and provide the pins to the customer to put on wires.  But I'm looking for a UK stockist and can't find anything.
Those are called DIN plugs and everyone has them, from Maplin to Farnell and everywhere in between.
30  Using Arduino / General Electronics / Re: Ohm's Law. on: September 01, 2014, 03:02:28 pm
Diversions come about when some one is wrong and has to be corrected.
Like your use of the word intensity, what does that mean in this context.
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