OK, so I'm attempting to build a stepper motor driven Rev Counter... I've tried the search function and it throws up a bunch of stuff I don't get a definitive answer to.

http://arduino.cc/en/Tutorial/MotorKnob

Is

Code:

// change this to the number of steps on your motor
#define STEPS 100

defined by the stepper motor?

If so, is there a method of determining the amount of steps a motor has?

I am of course assuming that those 100 steps are per full revolution.

In my use I'm only going to need 3/4's of that rev range, so 270 degrees (see piccie below for the guage I'm using - image from fleabay)



I would assume that the amount of steps is down to 360 degrees, so the limitation is on the RPM of the engine to determine it's sweep right?

My application is real world, not sim, so the output is coming from a 12 volt source based on the frequency of it's repetition to generate RPM.  Would this need to be stepped down to 5 volts for use with the Arduino?

Apologies for the newb questions, but I'd rather like to get it right(ish) first time than fry equipment.

Cheers,
Rich

Which egg though?  If it is the one I had Saturday, then it was the chicken... as I had Chicken curry friday night.  

Which came out first... I'm not sure, I'd have to speak to a nutritionist to find out the relative metabolic breakdown for each  :o

Other than that, snakes lay eggs... but can you fry them, and will they taste like chicken eggs?

First woman on the map or was that a mistake?  Tongue

It's a little person, I just clicked the first one.  It could be me just getting out the shower with my towel on, haha.

Yeah it was... I deleted them though, I think?  Unless you were viewing them asd I was messing about???

I'm a bit of a donk when it comes to Google Maps though, it's obviously far less complicated than I'm managing to make it, lol :-?

Realised how to add... not far from you mowcius!

sweet, thankyou very much.  Now to hit google now I know what they're called

I posted it here as I'm not necessarily needing to hook up Arduino for this.

I'm wanting to make a light reactive LED matrix, of sorts that respond to pitch not volume, that will be compact enough to fit inside and XBox 360 face plate.

Problem is... I've tried googling for ideas and getting pretty much no-where.

I'm guessing a simple form of a graphic equaliser but with the LED's being all rather random would be ideal.

Hlp!!

Just use the force and you should be golden

see if I could find a 3.3 VDC or 5VDC output that is only on when the TV is on

Like the power LED for example?

NAH, still MPG here as mowicus said... although you buy fuel per litre now.  It's only taken 40 years to get this far, by the time we're fully indoctrinated we'll all be speaking esperanto  ;D

if they had to go through the hassle of adapting your directions to their toolkit.

A very valid point, hence the most obvious suggestion would be to include both units from the get go... but stick with one unit as the primary.

And regards MPH / KMH (or KPH)... the UK stuck with MPH, yet everything else is Metric.  Go figure that one out!!

Binary.  You can get up to 1023 on your fingers then and it's pretty easy.  I used to do it when I was a photocopy monkey.

You missed a trick there, let's face it when you count, you don't start at Zero as there's nowt to count ... you coulda denoted no fingers as 1024

Just think of all those copies that you coulda have done extra, lol.

Oh, and I still see a billion as a million million too....

Maybe we should expand this to what a billion is... Is it a thousand million or a million million?  Wink

EEEeeek, don't open THAT can of worms, it would bring into question the disarray of associated 'illions (like trillion and squillion and vermillion)

Without entering the world of one is right the other is wrong, I just say go with one measurement system you are happy with from front to back and include the other where necessary in brackets like you suggested.

Personally I'd go Metric throughout due to the proliferation of metric components that a user is going to be ordering regardless of their shoreline and include the Imperial measurements in brackets for the relevant areas, namely wood dimensions.

It's all about fashion anyways... metal and technology is hip n trendy, so they use mm, wood is traditional and guesstimate, ergo inches.  Just my take on it, and both systems are "right" in their own world.

You're aiming your book at a technical market, or at least technical wannabe's (at the simplest level) so stick with the technical nomenclature and add the Imperial / AS for fluffyness (as in feel good)

You should also consider having it translated in to Esperanto in case you upset a new age fundamentalist, lol.  :-X

You mean these ones that I just googled?

http://www.rapidonline.com/productinfo.aspx?tier1=electronic+components&tier2=Integrated+Circuits&tier3=Sensors&tier4=A3214EUA-T+Hall+Effect+switch&moduleno=77082

Might be the .co.uk version of google chucking them up quicker for you, but it was the first link (well, the one that isn't a pdf)