(Arduino Study) Led on/off using piezo speaker knock.

source code

const int ledPin = 13;
const int knockSensor = A0;
const int threshold = 100;

int sensorReading = 0;
int ledState = LOW;

void setup(){
  pinMode(ledPin, OUTPUT);

void loop(){
  sensorReading = analogRead(knockSensor);
  if(sensorReading >= threshold)
    ledState = !ledState;
    digitalWrite(ledPin, ledState);


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