What I wanted to learn, and why it interested me: Knowing how to install the hardware and   control the LED strip by programing it. LED could efficiently create visual effect and useful in both life and artwork.

Process and reflection: 

A very useful little project. It gave me the opportunity to learn about the LED light strips that I had been curious about for a long time. I gained more understanding in the aspects of soldering LEDs and signal flow.

Besides, I fund that when the input is very sensitive, the changes in the LEDs may not be easily observable within a small space.

#include <PololuLedStrip.h>

const int LEDSTRIPPIN = 2; // LED strip data pin

const int NUMLEDS = 13;    // number of LEDs in the strip

const int LDRPIN = A0;     // Photoresistor data pin A0

PololuLedStrip<LEDSTRIPPIN> ledStrip;

rgb_color colors[NUMLEDS];

const int THRESHOLD = 800; // Brightness of environment

void setup(){

  pinMode(LDRPIN, INPUT);

  Serial.begin(9600); // 

}

"void loop(){

  int sensorValue = analogRead(LDRPIN);  // 0 ~ 1023     

  if(sensorValue > THRESHOLD){

    // Light is bright, turn off the LED

    for(int i = 0; i < NUMLEDS; i++){

      colors[i] = rgb_color(0, 0, 0);

    }

  } else {

    // lightness go lower, the light getting darker

    // 将 [0 ~ THRESHOLD] 映射到 [255 ~ 0]

    int brightness = map(sensorValue, 0, THRESHOLD, 255, 0);

    // 限制范围，避免异常

    brightness = constrain(brightness, 0, 255);

    rgb_color yellow = rgb_color(brightness, brightness, 0);

    for(int i = 0; i < NUMLEDS; i++){

      colors[i] = yellow;

    }

  }" CITATION HERE, Rewrite by CHATGPT

  ledStrip.write(colors, NUMLEDS);

  delay(30); 

}