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Re: GPIO on consoleLCD-VX

by Edward Y :: Rate this Message:

Hi Dave,

Oops, I didn't use a current-limiting resistor; I'll go get one.

The LED I got is labeled 'Can be driven directly with 3-12VDC', maybe it's got an integrated resistor but it looks very ordinary and small.

As for the buzzer, I didn't know I would need a driver circuit for the buzzer. I'll figure it out.

The buzzer I got is labeled, 'Operating Voltage: 3-8Vac', 'Frequency: 2400Hz'.

Also, on the example circuit what does P2.0 mean?

Thanks for your advises.
Edward

Dave Hylands wrote:

Hi Edward,

> I can light a LED which is connected to GPIO13 (X_MOST) and the GND right
> above it.
>
> The LED blinks when I do echo "GPIO out set" > /proc/gpio/GPIO13.
>
> Is blinking the right behavior for my LED?

No - the LED should go on solid. Hopefully you connected an LED and a
current limitnig resistor.

> I'm would like to attach a buzzer and a LED so that they function as status
> indicators for my gumstix.
>
> Do you have any suggestion?

I've never tried driving a buzzer, but presumably you could. You'd
need some type of driver circuitry.

There is a PWM output on the gumstix which might be usable. You'd need
to look at the frequency range that it can produce.

You Should be able to use an ordinary speaker with a simple circuit like this:
<http://www.sixca.com/micro/mcs51/music51/index.html>

You just need to provide a square wave on the P2.0 line with the
frequency you'd like to produce.

--
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/

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