Keywords: ATmega8 ADC sampled “knocks” at 450 Hz rate, directly.svg ADC at 450 Hz sampling rate The signal was picked up directly from a piezoelectric buzzer shunted with a 680 kΩ resistor used as a microphone Note the relatively large signal falling times resulting from the high internal resistance of the buzzer not allowing for the ADC-internal store and hold capacitor to discarge in timely manner Own Ivan Shmakov 2014-06-08 <gallery mode packed > ATmega8 ADC sampled knocks at 450 Hz rate svg </gallery> ATmega8 Piezoelectricity Cc-zero |