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Rock Band/Guitar hero drum pedal issue

Discussion in 'General Electronics Discussion' started by badger_, Mar 4, 2011.

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  1. badger_


    Mar 3, 2011
    Hello there!

    I'm wondering if someone could help me adapt a circuit from this website:

    This circuit takes an off/on signal from two Rock Band drum pedals and, essentially, allows them to NOT block one another if one of the pedals is down. These pedals work by magnetic switch.

    Unfortunately, I need this circuit to work with the Guitar Hero pedal, which works with a piezoelectric sensor which, from what I can tell, outputs a small voltage spike when the pedal is pressed.

    Does anybody have any idea how I can modify the circuit to accept the sensor inputs and still produce the circuit's output?


    Can I change the sensor output to create an on/off signal the circuit can use?

  2. Laplace


    Apr 4, 2010
    The pulse coming out of pin 4 will have a duration on the order of 0.1 second. So the microswitch in the pedal will need to stay closed for at least 0.1 second. However, a piezoelectric sensor will have a resonant frequency near 3 kHz so the output pulse will likely have a duration much shorter than 0.1 second. Also, peak voltage output of the pulse from the sensor may be much higher than 5 volts. I would replace the RC/Schmitt trigger combination with a 555 monostable to generate the 0.1 second pulse to operate the relay, and give some attention to clamping the input voltage received from the sensor.
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