Delay switch based on voltage

[prprog]

I am building a drum controller and need a circuit that based on how hard you hit a piezo disc you generate 2 signals - one will activate a switch immediately. A second switch should be activated but with a time delay based on how hard the piezo was hit. Any suggestions?

 

[Nigel Goodwin]

Try googling for existing projects!.

Like this:

 

[prprog]

eDrum site

Thanks for the eDrum site. I check this web site before...but the solution used a PIC , which already got analog inputs (ADC). My project involved no PIC so I am still looking on how to handle a delay switching based on the voltage generated by the piezo.

 

[Nigel Goodwin]

Thanks for the eDrum site. I check this web site before...but the solution used a PIC , which already got analog inputs (ADC). My project involved no PIC so I am still looking on how to handle a delay switching based on the voltage generated by the piezo.

It would seem stupid NOT to use a PIC? - it could be done (and was decades ago), but it makes it MUCH more complicated and expensive.

 

[prprog]

It would seem stupid NOT to use a PIC? - it could be done (and was decades ago), but it makes it MUCH more complicated and expensive.

....(I already made a Basic Stamp circuit and code that work very similar to the eDrum concept. It got ADC's that I added to manage the voltage from the piezo)...so it is not about doing a stupid thing not using a PIC , but more of a challenge...So again any suggestions on how to activate a switch (with time delay) based on the voltage generated by the piezo disc. (I dont want to used PIC or Stamps chips). [I have search the WWW for circuits but since I am not an expert I am not sure were to start] Thanks.

 

[Nigel Goodwin]

Check for 'sample and hold' circuits.

I'm always sceptical though when people say they want a 'challenge', spending lots of time and money to create an inferior project by using old technology - it's usually ONLY because it's a school assignment!.

 

[prprog]

Check for 'sample and hold' circuits.

I'm always sceptical though when people say they want a 'challenge', spending lots of time and money to create an inferior project by using old technology - it's usually ONLY because it's a school assignment!.

Thanks for the tip - I will check sample and hold circuits. No this is not a school assigment. I do electronics as a hobby.

 

[prprog]

delay switch based on piezo sensor

Hi. I am back to work on this project. Let me re-stated what I am trying to do. I have the "internal" circuit board of a MIDI keyboard. It is touch sensitive based on the time it takes to close 2 switches. So I figured that if I can find a circuit that can mimic this time closure switches I can make a drum or mallet controller out if this. So based on how hard you hit a piezo disc you generate 2 signals - one will activate a switch immediately. A second switch should be activated but with a time delay based on how hard the piezo was hit. Again any suggestions.?

 

[Hero999]

A sample and hold circuit can catch the peak voltage value and the control voltage pin on a monostable 555 timer can vary the delay depending on the voltage.