Click not Biiiinnnnggggg
John Couture
Posts: 370
PROBLEM DESCRIPTION:
In moving my circuit from a breadboard to a perfboard (i.e. soldered connections), the piezo does not seem to want to give up a nice tone but rather sounds more like a click.·· When I run the perfboard from the SX-KEY I get the tone, but when I take the key off and try to run it from the 4mhz resonator, I get the click.··Running SX18 at 4mhz. ·Other notes:
1) The breadboard version gives tone with either the key or the resonator.
2) I swapped the SX and the resonator with the breadboard, no change, tone/click on perfboard, tone/tone on breadboard.
3) I soldered in the resonator, no change
Because the perfboard works ok with the SX-Key but not with the resident resonator, I'm guessing that it is not a wiring or component issue but rather something that is present on the SX-Key but not in my circuit?
Schematic attached for those intersted.
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John J. Couture
San Diego Miramar College
In moving my circuit from a breadboard to a perfboard (i.e. soldered connections), the piezo does not seem to want to give up a nice tone but rather sounds more like a click.·· When I run the perfboard from the SX-KEY I get the tone, but when I take the key off and try to run it from the 4mhz resonator, I get the click.··Running SX18 at 4mhz. ·Other notes:
1) The breadboard version gives tone with either the key or the resonator.
2) I swapped the SX and the resonator with the breadboard, no change, tone/click on perfboard, tone/tone on breadboard.
3) I soldered in the resonator, no change
Because the perfboard works ok with the SX-Key but not with the resident resonator, I'm guessing that it is not a wiring or component issue but rather something that is present on the SX-Key but not in my circuit?
Schematic attached for those intersted.
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John J. Couture
San Diego Miramar College
Comments
If you experience the problem when you change ONLY the SX-Key by replacing it with a 4Mhz resonator then I suspect you likely have a resonator related problem. The resonator section of your circuit diagram looks fine to me.
What resonator setting are you using in your DEVICE directive? Is it OSC4MHZ or something else?
- Sparks
Ok, based on what you two suggested,
1) I wrote a simple program that just sounds the piezo (see attached) so that we can eliminate sofware problems
2) Tested program and same characteristics (click on perf, tone on sx-key)
3) I added a .01uf from positive·on·piezo to ground.· The Piezo then clicked on BOTH the resonator and the SX-Key
4) Removed cap and got click on resonator, beep on key
5) The program seemed to freeze up randomlly when the SX-Key is disconnected.· Apparently·when I put my finger across the four terminals where the SX-KEY is connected it seems to execute the program (albiet click, click, click).· Thus, it must be something about capacitance???
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John J. Couture
San Diego Miramar College
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John J. Couture
San Diego Miramar College
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John J. Couture
San Diego Miramar College
You were spot on with the caps identified in the SOUND command help file. My apologies for not knowing that. Thanks guys!
P.S. I was also tickled that I had the parts. After a couple of years of collecting various values of caps, resistors and IC's I was beginning to wonder if I overdid it (grin).
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John J. Couture
San Diego Miramar College
Here is some information on driving a piezo, that might be helpful....
http://forums.parallax.com/showthread.php?p=466534
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Beau Schwabe
IC Layout Engineer
Parallax, Inc.
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John J. Couture
San Diego Miramar College