Hi, i have used a piezo sensor before to detect pressure, following the example at http://arduino.cc/en/Tutorial/Knock . There, in order to protect the pin of the Arduino, a 1 MOhm resistor is used in parallel with the sensor. [image] Now i want to use the same piezo sensor as a transducer, driven …

Difference between a piezo transducer and a piezo sensor

system February 10, 2013, 12:17am 7

Is that transistor okay ? It seems as if the Emitter and Collector are the other way around.

Did you try that toneAC library with twice the volume ?

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