please dont rip this site

Piezo Speaker Output


Dave VanHorn says

Driving a piezo from a micro usually follows a pattern..

One lead grounded, one lead to the micro. Too soft.

Both leads to the micro, driven in opposition. Nice and loud.

Then the strange behaviour begins.

After a while, you notice the similarity in the schematic between a charge pump voltage doubler and your piezo element and port pins, and you realize that every time you flip the piezo, you are flirting with SCR Latchup or glitching your micro.

Then you drive it through a pair of HC inverters at least, and get "happy beeps"

PWM@ Speakers

Piezos are also used as pressure sensors +

See also:

file: /Techref/piezos.htm, 1KB, , updated: 2006/1/24 09:35, local time: 2012/5/24 07:47,
TOP NEW HELP FIND: 
38.107.179.232:LOG IN
 ©2012 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE! / 

<A HREF="http://www.ecomorder.com/techref/piezos.htm"> Piezos</A>
After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?
 
Stepper motors CAN be smooth!
And stepper controllers can be strong and cheap. Roman Black's Linistep stepper controller kits:
o 18th microstep
o Linear smoothing 		  o Open source
o Full kit $25!
 

Robotics nuts!

Check out http://users.frii.com/dlc/robotics/projects/botproj.htm from Dennis Clark. This guy ROCKS! He has made (and sells but also releases code, docs, etc...) for a number of cool little robotic modules including whiskers, IR proximity detect and remote control, Sonar proximity detect, PWM, Servo, compass. Most of these use the little PIC 12C508 controller which costs basically nothing and is soooo tiny.
The 4 servos, 2400 baud serial servo controller is a wonder of magic and he sells the programmed chip for $8. Wow!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .