Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: spizzak on July 26, 2009, 08:01:16 PM

Title: Buzzer
Post by: spizzak on July 26, 2009, 08:01:16 PM

Hey, I got this buzzer to use with one of my robots but I'm not sure it will work. When I connect it to 5V the sound it makes is barely audible. Am I doing something wrong? Is there a special way to connect it? Is it even mean for DC?

http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&WT.mc_id=hp_go_button&KeyWords=668-1101-ND&x=&y=

Title: Re: Buzzer
Post by: wil.hamilton on July 26, 2009, 08:15:53 PM

it says it only handles 1 mA.  I'm wondering if you fed it too much current and fried it?

and yes, that would work w/ dc

Title: Re: Buzzer
Post by: spizzak on July 26, 2009, 09:00:03 PM

well it still makes a sound its just very quiet.. and it wasn't like it was loud for a quick burst and then quieted

Title: Re: Buzzer
Post by: billhowl on July 27, 2009, 04:26:55 AM

In the spec it said:

Quote

Type    Piezo Transducer, External Drive
Frequency   3.8kHz
Voltage Range   1 ~ 20Vp-p
Voltage - Rated   5Vp-p

By External Drive it mean it need to drive with 3.8 KHz AC and not DC, may be you can connect it to PWM pin

Title: Re: Buzzer
Post by: spizzak on July 27, 2009, 07:02:02 AM

Any ideas on how I would do that (software-wise anyway)?

Title: Re: Buzzer
Post by: billhowl on July 27, 2009, 08:03:28 AM

Check out this tutorial

Making sounds with PWM
http://www.societyofrobots.com/member_tutorials/node/235 (http://www.societyofrobots.com/member_tutorials/node/235)

Title: Re: Buzzer
Post by: spizzak on July 27, 2009, 09:01:11 PM

How do I make sure its not getting too much current?

Title: Re: Buzzer
Post by: Razor Concepts on July 27, 2009, 09:25:27 PM

It will only draw as much current as it needs as long as its at 5 volts  ;D