I'm playing a standard seatbelt chime of 2kHz into a microphone, then into a LM321 op amp with a gain of 10. Then the op amp output into an Arduino Uno with an LCD display that comes with an Arduino Starter Kit and an LED indicator. I'm trying to get the Arduino to recognise whether the seatbelt ch…

Making an Arduino Uno recognise whether the frequency/sound on A0 is correct

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