[Noisebridge-discuss] buzzer code

e at eden2.com e at eden2.com
Thu Jul 7 17:06:23 PDT 2011


when you say buzzer, i think piezo buzzer (those gold disc things), and when you get a sound out of it from straight dc voltage, i think self-driven piezo buzzer. this implies two things: to get a different sound out of it, you'll need to drive the raw element itself, without its built-in supporting electronics (or hack the supporting electronics), and even if you did that, piezo buzzers have a very narrow frequency response, so your much-lower-frequency sound will also now be much quieter.

On Jul 7, 2011, at 4:26 PM, Sean Cusack <sean.p.cusack at gmail.com> wrote:

> Hey noisebridge!
> 
> For tose of hyou that may not know, I'm in brooklyn right now competing in the red bull creation contest. We're 10 hours in. We're building a see saw that rotates 360 degrees instead of going up and down. A little tricky to explain in words, but there have been video cams everywhere, so I'm sure you'll get a chance to see it :).
> 
> I'm doing a bunch of the electronics, and have a stupidly simple question that has been stumping me all day - I've got a set of three 12V horns that look like they act just like buzzers, but I am having a hell of a time driving them with a 12V power supply. A 500Hz PWM signal to them sounds like garbage...I'm really looking for a much lower, satisfying BOOP instead of a high pitched WHEE that I'm getting right now. Any ideas / link to example code that can be run on an arduino that can make a sweet low pitched BOOP (that's really f-ing loud BTW) using a buzzer setup?
> 
> Any help would be appreciated...62 hours left to go in the comp...and its super exciting!
> 
> xoxo -
> Sean
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