[PD] [OT] Using a webcam to measure a wheel's rotation speed

[Matteo Sisti Sette]

On 09/02/2010 06:19 PM, Roman Haefeli wrote:

>
> I don't think that using a camera for this is the best approach.

Yeah I didn't expect it to be, I just thought it might work :)


> The arduino approach is likely easier to implement, depending on what
> kind of sensors you can use.
>
> You could do it even without using an arduino at all: hook up the
> resistor/LDR to your sound card input and use [dfreq~] from zexy to
> measure the rate. I think you can't get a more precise setup than this
> (by using the high sample rate of a common sound card). I once used that
> to measure the speed of a turntable.

That's a great idea!!

I guess the same would apply to using a hall effect sensor, wouldn't it?

Thanks a lot
m.