Using Piezo element with BS2
TonyA
Posts: 226
Hi,
I am interested in using a piezo element to pickup vibrations from a guitar and then use pulsin to trigger midi messages from the BS2 out.
Could I use a piezo element from radio shack. If so would I need to amplify the voltage before it enters the stamp?
I tried previously to use an opamp with a schmitt trigger IC to convert the raw voltage from a guitar output jack into a square wave. Then that square wave read by the stamp using pulsin. I just plugged a guitar into an op amp and schmitt trigger and then ---> the stamp. The line level signal was too weak for some reason and I could barely read the voltages untill I hooked up a guitar preamp. I was trying to read individual frequencies with this. (Note frequencies from an electric guitars output jack. The stamp was able to read frequencies but only after I ridiculously amplified the signal before going into the stamp.)
I used this code from Gillilands book:
x var word
Main:
pulsin 0,1,x
x=x*2
debug?x
goto Main
I've scanned a page with the schem and code from Gillilands book (the MicroController App. Cookbook 2).
Is it easier than doing the above? (Piezo --->stamp (pulsin), or use "IN" and somekind of IF statement to send my midi messages out? Right now.
like:
IF IN0 = 1 THEN
Serout [noparse][[/noparse]status byte, data byte, data byte,]
Would that work?
Thanks,
Tony
Post Edited (TonyA) : 9/5/2005 5:45:04 PM GMT
I am interested in using a piezo element to pickup vibrations from a guitar and then use pulsin to trigger midi messages from the BS2 out.
Could I use a piezo element from radio shack. If so would I need to amplify the voltage before it enters the stamp?
I tried previously to use an opamp with a schmitt trigger IC to convert the raw voltage from a guitar output jack into a square wave. Then that square wave read by the stamp using pulsin. I just plugged a guitar into an op amp and schmitt trigger and then ---> the stamp. The line level signal was too weak for some reason and I could barely read the voltages untill I hooked up a guitar preamp. I was trying to read individual frequencies with this. (Note frequencies from an electric guitars output jack. The stamp was able to read frequencies but only after I ridiculously amplified the signal before going into the stamp.)
I used this code from Gillilands book:
x var word
Main:
pulsin 0,1,x
x=x*2
debug?x
goto Main
I've scanned a page with the schem and code from Gillilands book (the MicroController App. Cookbook 2).
Is it easier than doing the above? (Piezo --->stamp (pulsin), or use "IN" and somekind of IF statement to send my midi messages out? Right now.
like:
IF IN0 = 1 THEN
Serout [noparse][[/noparse]status byte, data byte, data byte,]
Would that work?
Thanks,
Tony
Post Edited (TonyA) : 9/5/2005 5:45:04 PM GMT
752 x 944 - 62K
Comments
·· Is this related to your post in the Sandbox?
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Chris Savage
Parallax Tech Support
csavage@parallax.com
Yes, I guess it is. I thought I'd post here since I had some specific BS2 programming questions.
Thanks,
Tony
Post Edited (TonyA) : 9/6/2005 12:33:50 AM GMT