yuhan-03.cpp

#include <Adafruit_NeoPixel.h>
#define PIN 6
Adafruit_NeoPixel strip = Adafruit_NeoPixel(240, PIN, NEO_GRB + NEO_KHZ800);
int threshold = 160;
int sampleVal = 0;
int numPixels = 240;

void setup() {
  Serial.begin(9600);
  pinMode(13, OUTPUT);
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
}

void loop()
{
  sampleVal = analogRead(0);
  if (sampleVal > threshold) {
    for (int j = 0; j < numPixels; j++) {
      strip.setPixelColor(j, 255,255,255);
    }
    strip.show();
  }
  for (int j = 0; j < numPixels; j++) {
      strip.setPixelColor(j, 0,0,0);
    }
 strip.show();
  digitalWrite(13, LOW);
  Serial.print(0);
  Serial.print(" ");
  Serial.print(300);
  Serial.print(" ");
  Serial.print(threshold);
  Serial.print(" ");
  Serial.println(sampleVal);
}