简单的实现土味实时声音可视化

const int analogInPin = A0;  // Analog input pin that the potentiometer is attached to
const int analogOutPin = 9; // Analog output pin that the LED is attached to
const int analogOutPin2 = 10;
int sensorValue = 0;        // value read from the pot
int outputValue = 0;        // value output to the PWM (analog out)
int outputValue2 = 0;
void setup() {
  // initialize serial communications at 9600 bps:
  Serial.begin(9600);
}
void loop() {

  // read the analog in value:
  sensorValue = analogRead(analogInPin);
  // map it to the range of the analog out:
  outputValue = 255-map(sensorValue, 0, 1023, 0, 255);
  outputValue2 = outputValue;
  // change the analog out value:
  analogWrite(analogOutPin, outputValue);
  analogWrite(analogOutPin2, outputValue2);
  // print the results to the Serial Monitor:
  Serial.print("sensor = ");
  Serial.print(sensorValue);
  Serial.print("\t output = ");
  Serial.println(outputValue);
  // wait 2 milliseconds before the next loop for the analog-to-digital
  // converter to settle after the last reading:
  delay(2);
}