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Member #862939

Member Since: November 7, 2016

Country: United States

  • Could you explain the theory behind putting the resistor in parallel with the sensor to reduce the voltage? I did some testing with the circuit with smaller and larger resistor values, and it seems that when you increase the resistance, the measured voltage on the Arduino's pins increases, and when you decrease the resistance, the measured voltage is decreased. This would seem to mean that the piezo is acting like a really large resistor and the resistor in parallel is actually making the circuit a voltage divider, where the arduino is measuring the voltage across the resistor. But if that's the case, why not use a larger resistor and measure the voltage across the sensor instead?

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