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31  Using Arduino / General Electronics / Re: NTC ID please. on: October 15, 2014, 06:51:35 pm
Instead of making us guess, what are you trying to do?

Is this meant as some kind of soft start for the power supply?
32  Using Arduino / Motors, Mechanics, and Power / Re: Does a continuous rotation servo mind short bursts of too heavy load? on: October 15, 2014, 06:07:04 pm
It depends on the quality of the servo. Plastic gears may strip.
33  Using Arduino / Motors, Mechanics, and Power / Re: How to measure Instantaneous Current and Voltage in AC system on: October 15, 2014, 06:06:00 pm
Quote
I drew this up for use with a DC motor being used as a generator...

In another thread, a gentleman's son is doing a science fair project, I think it was, using a DC motor as a wind generator.
34  Using Arduino / Motors, Mechanics, and Power / Re: Choosing motor driver/controller and basic project feasibility on: October 15, 2014, 02:25:46 pm
That should do it.
35  Using Arduino / Motors, Mechanics, and Power / Re: Choosing motor driver/controller and basic project feasibility on: October 15, 2014, 11:26:35 am
From the same website, you'll need three of these to control all 6 motors:
http://www.robotshop.com/ca/en/sabertooth-dual-12a-regenerative-motor-driver.html
36  Using Arduino / Motors, Mechanics, and Power / Re: High Resolution Stepper Motor Speed Control on: October 15, 2014, 11:24:06 am
arg110, when you said "multimeter", I think you meant "potentiometer".
37  Using Arduino / Motors, Mechanics, and Power / Re: How to measure Instantaneous Current and Voltage in AC system on: October 15, 2014, 09:50:13 am
Oh, and connect A1 to the junction of the 10k resistors so you can measure that as a reference point.
38  Using Arduino / Motors, Mechanics, and Power / Re: How to measure Instantaneous Current and Voltage in AC system on: October 15, 2014, 09:47:35 am
I drew this up for use with a DC motor being used as a generator, where he also needed to measure voltage when the motor is turning backwards and therefore generating a negative voltage.

Insert the current transformer in place of the motor. You may want to change that 0.1uF cap across it into a 1nF instead. Select RL so that the maximum peak voltage is never greater than 2.5V.
39  Using Arduino / Motors, Mechanics, and Power / Re: How can i power and control 2 motors? on: October 15, 2014, 09:40:03 am
Let me emphasize something MarkT said - do NOT use the 3.3V output from the Arduino to power those motors. You'll likely smoke the regulator on the Arduino. That is a low current output, motors typically draw a lot of current when starting. It is called Stall Current.
40  Using Arduino / Motors, Mechanics, and Power / Re: High Resolution Stepper Motor Speed Control on: October 15, 2014, 09:21:42 am
That is very confusing. You might be better off starting over.
41  Using Arduino / General Electronics / Re: Arduino AC dimmer circuit on: October 15, 2014, 09:19:50 am
Please post as a JPG, GIF, or PNG, not a Powerpoint file. Not everyone has Microsoft Office.
42  Using Arduino / Motors, Mechanics, and Power / Re: Nema34 Motor Not Running on: October 15, 2014, 06:43:56 am
No! Please don't teach him using delay. Horrible idea. Nonscalable. Can't do anything else while it is delaying.

OK, I'm calmed down. That'll do for testing.
43  Using Arduino / Motors, Mechanics, and Power / Re: High Resolution Stepper Motor Speed Control on: October 14, 2014, 11:32:57 pm
Please use the code tags. If you click "Preview", it is the button with a # symbol on it.

I'd very much like to see -all- the code to tell what is going on.

Which stepper driver board(s) is it using? Pictures? Links, if you know where they came from?
44  Using Arduino / Project Guidance / Re: Advice on my Microphone Placement Device on: October 14, 2014, 10:20:38 pm
So you are the feedback and control part of the circuit, yes? You listen to the sound, then decide where to move the microphone.

Just about any Arduino will work. Probably more of an issue is the motor noise - it is going to be nearly impossible to isolate motor noise from the microphone while it is moving.

The simplest to drive are probably RC servos modified for continuous rotation because the Arduino only has to supply a series of logic pulses for which there is already a library, but the gear noise is going to be rather high. Stepper motors take a bit more circuitry to run but will be somewhat quieter, even more so with a belt and rubber mount providing some noise isolation. Stepper motors on microstepping should be quieter, too.

With an Arduino Uno R3, there are shields you can plug in that can then have three stepper motor driver circuits plugged into it.
45  Using Arduino / Motors, Mechanics, and Power / Re: High Resolution Stepper Motor Speed Control on: October 14, 2014, 10:09:11 pm
Do you have the source code?
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