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1  Using Arduino / Project Guidance / Re: LCD Clock on: Today at 10:54:17 am
You probably have it unzipped at the wrong level.

When I unzipped it into the library folder I got datetime inside datetime, which is an extra level. If you got that you need to do away with the outer datetime folder and move everything up one level.
2  Using Arduino / Project Guidance / Re: LCD Clock on: Today at 10:27:33 am
How do I get that library, then?

Over 12 million Google hits for "datetime.h" and the first one's a winner....

http://playground.arduino.cc/Code/dateTime
3  Using Arduino / Project Guidance / Re: LCD Clock on: Today at 10:06:27 am
To be honest, I don't know.

That'll be a "no" then, since it's not a standard library and you would know if you had installed it.

I get the exact same message trying to compile your code and I don't have that library.
4  Using Arduino / Project Guidance / Re: program to find rpm on: Today at 08:21:51 am
I think I see a potential problem in your code.... I haven't had a long look (I'm at work, 15h20 here), but I think you'll get multiple counts per pass of the sensor. The pin may be read more quickly than the effect of the passing metal and you'll get many count++'s per pass.

I think you may need to look at interrupts, and look for the edge of the signal, rather than its presence.
5  Using Arduino / Project Guidance / Re: pull down resistor on: Today at 07:55:37 am
The lovely ladyada has this tutorial whch may help.
6  Topics / Education and Teaching / Re: prospect of a good beginner book on: Today at 07:45:20 am

By pdf the OP might mean "free"  smiley-cool
7  Using Arduino / Project Guidance / Re: program to find rpm on: Today at 07:37:07 am
Well you can at least try to compile it: you don't need the hardware for that.

Right now it doesn't compile: you have a typo in one of your variable names.....

Make life easier for everyone and use the # button above the  smiley-sweat to put your code in tags

Code:
so that
{
it looks like
}
this...

And as I said earlier, if you use Serial, don't use pin 1. In fact don't use pin 1 any way.

Also bad practice to change your code in one post since then the comments after it make no sense to other readers. Right now my previous comment on "spin" now makes no sense since you changed the name to "sensorpin"
8  Using Arduino / Programming Questions / Re: Reading the value of a sensor every X millis (best practise?) on: Today at 07:30:38 am
Quote
I was trying to use the rest of the time

There is no "rest of the time".... that doesn't make sense.  Seems you're thinking "delay" still, where yes you delay for say 1 second where the system sits and does nothing. But in the "without delay" case, that's not what happens.

This video may help,
9  Using Arduino / Project Guidance / Re: program to find rpm on: Today at 07:14:51 am
Not being funny, but why ask us? Why don't you test it?

In any case it's difficult to understand someone else's code with not on single comment in it, and we don't know what a "proximity sensor" actually is.

One thing I do see though, is that with spin = 1, a digitalRead(spin) will be reading pin 1 which is a no-no when you use Serial, since it also uses that pin.
10  General Category / General Discussion / Re: Noob question on: Today at 05:50:00 am

Ah! I was thinking click as in making a sound....
11  Topics / Education and Teaching / Re: prospect of a good beginner book on: Today at 05:07:44 am
thanks bro but I want a book in electronic eBook format (pdf)

Then maybe you should edit your original post to say so
12  Topics / Education and Teaching / Re: prospect of a good beginner book on: Today at 04:02:51 am
Forum member CrossRoads and his wife published this last year:

http://www.amazon.com/Arduino-Teens-For-Course-Technology/dp/1285420896
13  Using Arduino / Motors, Mechanics, and Power / Re: Minimizing power consumption of an Uno? on: Today at 03:31:08 am
I'm really not sure how to fit the multimeter between the USB cable and the Arduino.

Yeah I guess that might be tricky.... maybe sacrifice a cable and peel it open and break one of the conductors?

I once tried to measure the voltage at the end of a usb cable and found it very tricky not to short things, so good point.

You could maybe use a battery and provide power to the barrel jack or the Vin, which might make using the meter a bit simpler.
14  Using Arduino / Motors, Mechanics, and Power / Re: Minimizing power consumption of an Uno? on: Today at 03:11:24 am
What is the base power draw with nothing attached with an empty sketch?

Surely you have a meter and can measure that* yourself?

If you don't have a meter, you really really really should get one tout de suite.

*edit: Well the current anyway, not the power as such, not with a standard meter
15  General Category / General Discussion / Re: Noob question on: Today at 03:04:43 am
On the Arduino site is the function click. (or similar to that)

This is the Arduino site. I don't see a function called click, or similar to that, here: http://arduino.cc/en/Reference/HomePage.

So you'll need to provide a link, else it's likely nobody will know what you're talking about.
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