how to connect a piezo to bs2
Archiver
Posts: 46,084
i know it's a basic question!
how do i connect a piezo speaker to an output of the stamp,
i try with a 470 ohm, but dont have the full volume as if i
connected to straight 5v.
thanks
John
how do i connect a piezo speaker to an output of the stamp,
i try with a 470 ohm, but dont have the full volume as if i
connected to straight 5v.
thanks
John
Comments
johneck790@s... writes:
> i know it's a basic question!
> how do i connect a piezo speaker to an output of the stamp,
> i try with a 470 ohm, but dont have the full volume as if i
> connected to straight 5v.
> thanks
> John
Assuming the peizo you are using is simply supplied with 5 volts you can do
the following;
Get a simple NPN transistor such as a 2n2222. Connect the emitter to ground.
Connect the collector to one side of the peizo and the other end of the peizo
to +5 volts (or +12)
Connect a 1k ohm resistor between the base of the transistor and the output
pin of the stamp.
When you command the stamp pin to go high the peizo should sound and visa
versa.
Ken
[noparse][[/noparse]Non-text portions of this message have been removed]
> In a message dated 3/23/2003 6:27:01 PM Pacific Standard Time,
> johneck790@s... writes:
>
> > i know it's a basic question!
> > how do i connect a piezo speaker to an output of the stamp,
> > i try with a 470 ohm, but dont have the full volume as if i
> > connected to straight 5v.
> > thanks
> > John
>
> Assuming the peizo you are using is simply supplied with 5 volts
you can do
> the following;
>
> Get a simple NPN transistor such as a 2n2222. Connect the emitter
to ground.
> Connect the collector to one side of the peizo and the other end
of the peizo
> to +5 volts (or +12)
> Connect a 1k ohm resistor between the base of the transistor and
the output
> pin of the stamp.
> When you command the stamp pin to go high the peizo should sound
and visa
> versa.
>
> Ken
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
Thanks Ken,
try your circuit, dont work with my piezo, but i substitute a led
with a resistor, and with command freqout the led flash, any idea,
the piezo works fine on 5v
John
johneck790@s... writes:
> Thanks Ken,
> try your circuit, dont work with my piezo, but i substitute a led
> with a resistor, and with command freqout the led flash, any idea,
> the piezo works fine on 5v
>
> John
>
When your piezo does work, are you suppling a pulsed signal, or simply 5v and
ground?
Ken
[noparse][[/noparse]Non-text portions of this message have been removed]
smartdim@a... writes:
> >Thanks Ken,
> >try your circuit, dont work with my piezo, but i substitute a led
> >with a resistor, and with command freqout the led flash, any idea,
> >the piezo works fine on 5v
> >
> >John
> >
>
> When your piezo does work, are you suppling a pulsed signal, or simply 5v
> and
> ground?
>
> Ken
Also, do you know how much current your device consumes?
[noparse][[/noparse]Non-text portions of this message have been removed]
i'm connecting the piezo across +4.8v (4x1.2v nimh) and ground
and the current is 5 ma
thanks
John
--- In basicstamps@yahoogroups.com, smartdim@a... wrote:
> In a message dated 3/24/2003 6:54:21 AM Pacific Standard Time,
> smartdim@a... writes:
>
> > >Thanks Ken,
> > >try your circuit, dont work with my piezo, but i substitute a
led
> > >with a resistor, and with command freqout the led flash, any
idea,
> > >the piezo works fine on 5v
> > >
> > >John
> > >
> >
> > When your piezo does work, are you suppling a pulsed signal, or
simply 5v
> > and
> > ground?
> >
> > Ken
>
> Also, do you know how much current your device consumes?
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
johneck790@s... writes:
> Hi Ken,
>
> i'm connecting the piezo across +4.8v (4x1.2v nimh) and ground
> and the current is 5 ma
>
> thanks
>
hmmmmmmmmm,
If indeed the unit is pulling only 5ma, the stamp should be able to directly
drive the buzzer.
And, the NPN transistor idea should do the same. If I remember correctly,
you stated you could pulse an LED?
When you pulsed the LED, was the stamp providing ground for the buzzer, or
power.
If you pulsed the LED using ground, you should be able to do the same to the
buzzer. And IF YOU ARE SURE the buzzer uses only 5ma, no resistor is needed.
But to be safe, I recommend the transistor idea....Again
2n2222 or 2n3904
emitter to ground, base to the stamp pin through 1k ohms and the collector to
one side of your buzzer and the other side of the buzzer to your + 4.8 volts.
Is the 4.8 volt source using the same ground as the stamp power supply? The
ground for your buzzer must be tied to the same ground as your stamp.
Don't hesistate to write back if more help is needed.
Ken
[noparse][[/noparse]Non-text portions of this message have been removed]
which has it's own circuitry inside, if running it
directly off 5V gives a tone. If that's the case,
pulsing it with the stamp may not work.
--- smartdim@a... wrote:
> In a message dated 3/24/2003 10:59:23 AM Pacific
> Standard Time,
> johneck790@s... writes:
>
> > Hi Ken,
> >
> > i'm connecting the piezo across +4.8v (4x1.2v
> nimh) and ground
> > and the current is 5 ma
> >
> > thanks
> >
>
> hmmmmmmmmm,
>
> If indeed the unit is pulling only 5ma, the stamp
> should be able to directly
> drive the buzzer.
>
> And, the NPN transistor idea should do the same. If
> I remember correctly,
> you stated you could pulse an LED?
>
> When you pulsed the LED, was the stamp providing
> ground for the buzzer, or
> power.
>
> If you pulsed the LED using ground, you should be
> able to do the same to the
> buzzer. And IF YOU ARE SURE the buzzer uses only
> 5ma, no resistor is needed.
> But to be safe, I recommend the transistor
> idea....Again
>
> 2n2222 or 2n3904
>
> emitter to ground, base to the stamp pin through 1k
> ohms and the collector to
> one side of your buzzer and the other side of the
> buzzer to your + 4.8 volts.
>
> Is the 4.8 volt source using the same ground as the
> stamp power supply? The
> ground for your buzzer must be tied to the same
> ground as your stamp.
>
> Don't hesistate to write back if more help is
> needed.
> Ken
>
>
> [noparse][[/noparse]Non-text portions of this message have been
> removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed.
> Text in the Subject and Body of the message will be
> ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
=====
Chris Savage
Knight Designs
324 West Main Street
Montour Falls, NY 14865
(607) 535-6777
http://www.knightdesigns.com
__________________________________________________
Do you Yahoo!?
Yahoo! Platinum - Watch CBS' NCAA March Madness, live on your desktop!
http://platinum.yahoo.com