Ds18B20温度传感器

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Arduino网站：http://forum.arduino.cc/index.php?topic=15494.0
Arduino入门笔记：http://www.cnblogs.com/xiaowuyi/p/3395326.html

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变色兔子代码：
[mw_shl_code=bash,true]#include <OneWire.h>
#include <Adafruit_NeoPixel.h>

#define MAX_T   34.20
#define N 12
#define DS18S20_Pin 11
#define PIN A3
Adafruit_NeoPixel strip = Adafruit_NeoPixel(8, PIN, NEO_GRB + NEO_KHZ800);
#define DEBUG   Serial.print
#define DEBUGLN   Serial.println

//#define DEBUG
//#define DEBUGLN

unsigned char colors[N][3] = {
  0, 30, 200,
  0, 100, 200,
  0, 200, 200,
  0, 200, 200,
  0, 200, 120,
  0, 200, 0,
  100, 200, 0,
  200, 200, 0,
  200, 100, 0,
  200, 100, 0,
  200, 50, 0,
  200, 0, 0,
};

OneWire ds(DS18S20_Pin);
float avg_t = 0.0;
////////////////////////////////////////////
void setup(void) {
  Serial.begin(9600);
  strip.begin();
  pinMode(DS18S20_Pin, INPUT_PULLUP);
  //pinMode(DS18S20_Pin, LED_BUILTIN);
  int i = 0;
  while (true) {
    float t = getTemp();
    DEBUGLN(t);
    if ( (t < 50) && t > -50) break;
    delay(30);
  }
  for (i = 0; i < 3; i++) {
    avg_t += getTemp();
    delay(300);
  }
  avg_t = avg_t / i;
  DEBUGLN(avg_t);
}
/////////////////////////////////////////////
void loop(void) {
  float t = getTemp();
  DEBUGLN(t);
  DEBUGLN(avg_t);
  if ( (t < 50) && t > -50) {
    show_led(t);
  }
  delay(30);
}
///////////////////////////////////////////////
void show_led(float t)
{
  int r = colors[0][0], g = colors[0][1], b = colors[0][2];
  float j = N * ((t - avg_t) / (MAX_T - avg_t)) ;
  DEBUG("abc::");
  DEBUGLN(j);
  DEBUG("t::");
  DEBUGLN(t);
  if (j < 1)
    ;
  else if (j >= N) {
    r = colors[11][0];
    g = colors[11][1];
    b = colors[11][2];
  }
  else {
    int jx = floor(j);
    int js = ceil(j);

    int r1 = colors[jx - 1][0];
    int g1 = colors[jx - 1][1];
    int b1 = colors[jx - 1][2];

    int r2 = colors[jx][0];
    int g2 = colors[jx][1];
    int b2 = colors[jx][2];

    r = r1 + (j - jx) * (r2 - r1);
    g = g1 + (j - jx) * (g2 - g1);
    b = b1 + (j - jx) * (b2 - b1);
  }
  for (int i = 0; i < 8; i++)
  {
    strip.setPixelColor(i, strip.Color(r, g, b));
    strip.show();
  }
  delay(50);
}
//////////////////////////////////////////////////
float getTemp() {
  byte data[12];
  byte addr[8];
  if ( !ds.search(addr)) {
    ds.reset_search();
    return -1000;
  }

  if ( OneWire::crc8( addr, 7) != addr[7]) {
    return -1000;
  }

  if ( addr[0] != 0x10 && addr[0] != 0x28) {
    return -1000;
  }

  ds.reset();
  ds.select(addr);
  ds.write(0x44, 1);
  byte present = ds.reset();
  ds.select(addr);
  ds.write(0xBE);
  for (int i = 0; i < 9; i++) {
    data = ds.read();
  }

  ds.reset_search();
  byte MSB = data[1];
  byte LSB = data[0];
  float tempRead = ((MSB << 8) | LSB);
  float TemperatureSum = tempRead / 16;
  return TemperatureSum;
}[/mw_shl_code]

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温度测量总集：http://oszine.com/arduino%E4%BC% ... %E9%87%8F%E7%AF%87/

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里面有库文件：http://www.arduino.cn/thread-1345-1-1.html

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MAX7219点阵模块：http://blog.csdn.net/ling3ye/article/details/53494957

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心率传感器：http://www.arduino.cn/thread-3188-1-1.html