💡 孩子的成就感 + 安全性升级！炫书包：夜光LED与传感器结合 🚀

小学毕业的儿子准备上中学了，自己搜索选购了一款“我的世界“夜光书包。

受其发光警示作用的激发~夜路更安全，我决定用LED灯带和传感器给它添点炫酷效果。

【简单功能】

1.根据环境光强自动决定开关炫彩（随机七种）灯光

2.蜂鸣声音提示背后7米左右有人尾随

3.触摸开关可切换关闭蜂鸣提示

【材料清单】

6.UNO+IO传感器扩展板【实验用方便】

7.Cheapduino控制器【书包用简洁】

8.电源、开关、线材

【信号线针脚图】

【盖住环境光传感器模拟黑夜】

【Arduino 代码】

注：书包上的控制器最好选CheapDuino,小巧，低功耗，可用旧手机电池（3.7~4.2V）

[mw_shl_code=cpp,true]
#include <Adafruit_NeoPixel.h>
#define BUZZER_PIN A0
#define AmbientLight_PIN A5
#define TOUCH_PIN 10
#define PIXEL_PIN 9
#define PIR_PIN    11

// Parameter 1 = number of pixels in strip,  neopixel stick has 8
// Parameter 2 = pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
// NEO_RGB    Pixels are wired for RGB bitstream
// NEO_GRB    Pixels are wired for GRB bitstream, correct for neopixel stick
// NEO_KHZ400  400 KHz bitstream (e.g. FLORA pixels)
// NEO_KHZ800  800 KHz bitstream (e.g. High Density LED strip), correct for neopixel stick
Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800);

bool oldTouch = LOW;
bool newTouch = LOW;
bool touchState = 0;
///////////////////////////////////////////////////////
void setup() {
  pinMode(AmbientLight_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(PIR_PIN, INPUT);
  pinMode(TOUCH_PIN, INPUT_PULLUP);
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
}
///////////////////////////////////////////////////////
void loop() {
  // Get current button state.
  int ambLight = analogRead(AmbientLight_PIN);
  bool newTouch = digitalRead(TOUCH_PIN);
  bool pirYes = digitalRead(PIR_PIN);
  // Check if state changed from high to low (button press).
  if( ambLight < 5 ){
      if( (oldTouch == LOW) && (newTouch == HIGH )){
            touchState = 1 - touchState;
            delay(25);
      }

      if(touchState == 1)
         startShow(random(8));
      else if(pirYes == HIGH){
         startShow( 7 ); // Red
         buzzerAlarm();
      }else
         startShow(random(8));
  }
   // Set the last button touchState to the old state.
oldTouch = newTouch;
} // end ambLight
//////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////

void startShow(int i) {
  switch(i){
case 0: colorWipe(strip.Color(0, 0, 0), 20); // Black/off
         break;
case 1: colorWipe(strip.Color(0, 0, 0), 20); // Black/off
         colorWipe(strip.Color(255, 0, 0), 20);  // Red
      break;
case 2: colorWipe(strip.Color(0, 0, 0), 20); // Black/off
         colorWipe(strip.Color(0, 255, 0), 20);  // Green
         break;
case 3: colorWipe(strip.Color(0, 0, 0), 20); // Black/off
         colorWipe(strip.Color(0, 0, 255), 20);  // Blue
         break;
case 4: colorWipe(strip.Color(0, 0, 0), 20); // Black/off
         theaterChase(strip.Color(127, 127, 127), 20);  // white
         break;
case 5: colorWipe(strip.Color(0, 0, 0), 20); // Black/off
         rainbow(10);
         break;
case 6: colorWipe(strip.Color(0, 0, 0), 20); // Black/off
         rainbowCycle(1);
         break;
case 7: colorWipe(strip.Color(0, 0, 0), 20); // Black/off
         for(int i=0;i<5;i++){
            colorWipe(strip.Color(255, 0, 0), 10); // Red
            colorWipe(strip.Color(0, 0, 0), 10); // Black/off
         }
         break;
  }
}
////////////////////////////////////
void buzzerAlarm(){
         for(int i=0;i<80;i++){  // Buzzer start
            digitalWrite(BUZZER_PIN, HIGH);
            delay(1);
            digitalWrite(BUZZER_PIN, LOW);
            delay(1);
         }
         for(int i=0;i<100;i++){
            digitalWrite(BUZZER_PIN, HIGH);
            delay(2);
            digitalWrite(BUZZER_PIN, LOW);
            delay(2);
         }
}  // Buzzer end
///////////////////////////////////////////////////////
// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
  for(uint16_t i=0; i<strip.numPixels(); i++) {
strip.setPixelColor(i, c);
strip.show();
delay(wait);
  }
}

void rainbow(uint8_t wait) {
  uint16_t i, j;

  for(j=0; j<256; j++) {
for(i=0; i<strip.numPixels(); i++) {
   strip.setPixelColor(i, Wheel((i+j) & 255));
}
strip.show();
delay(wait);
  }
}

// Slightly different, this makes the rainbow equally distributed throughout
void rainbowCycle(uint8_t wait) {
  uint16_t i, j;

  for(j=0; j<256*5; j++) { // 5 cycles of all colors on wheel
for(i=0; i< strip.numPixels(); i++) {
   strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
}
strip.show();
delay(wait);
  }
}

//Theatre-style crawling lights.
void theaterChase(uint32_t c, uint8_t wait) {
  for (int j=0; j<10; j++) {  //do 10 cycles of chasing
for (int q=0; q < 3; q++) {
   for (int i=0; i < strip.numPixels(); i=i+3) {
      strip.setPixelColor(i+q, c); //turn every third pixel on
   }
   strip.show();

   delay(wait);

   for (int i=0; i < strip.numPixels(); i=i+3) {
      strip.setPixelColor(i+q, 0);       //turn every third pixel off
   }
}
  }
}

//Theatre-style crawling lights with rainbow effect
void theaterChaseRainbow(uint8_t wait) {
  for (int j=0; j < 256; j++) {    // cycle all 256 colors in the wheel
for (int q=0; q < 3; q++) {
   for (int i=0; i < strip.numPixels(); i=i+3) {
      strip.setPixelColor(i+q, Wheel( (i+j) % 255)); //turn every third pixel on
   }
   strip.show();

   delay(wait);

   for (int i=0; i < strip.numPixels(); i=i+3) {
      strip.setPixelColor(i+q, 0);       //turn every third pixel off
   }
}
  }
}

// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(byte WheelPos) {
  WheelPos = 255 - WheelPos;
  if(WheelPos < 85) {
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if(WheelPos < 170) {
WheelPos -= 85;
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
}[/mw_shl_code]

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