3D 打印的室内温度计，基于 Arduino 和 OLED 屏幕

MAKER:Bnbe_club／译：趣无尽 Cherry（转载请注明出处）

天冷了，养热带花草和宠物的同学们需要多留意室内温度。下面给大家推荐一个实用性强、制作简单的温度计。使用 DS18B20 温度传感器和 OLED 模块构建，这里使用的开发板是 Piksey Pico，代码是兼容 Arduino 的，你也可以使用 Arduino 来完成它。

制作步骤配有视频：

材料清单

Arduino 或 Piksey Pico × 1
DS18B20 温度传感器 × 1
0.96 英寸 OLED 模块 × 1
电平转换器模块 × 1

编程和测试

1、将代码文件上传至 Arduino。

2、显示器上的图形可以根据自己的具体情况来修改。

3、将所有的组件安装到面包板上。接线方式如图所示。

代码如下：

#include <Arduino.h>
#include <U8g2lib.h>
#include <OneWire.h> 
#include <DallasTemperature.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

/*
  U8glib Example Overview:
    Frame Buffer Examples: clearBuffer/sendBuffer. Fast, but may not work with all Arduino boards because of RAM consumption
    Page Buffer Examples: firstPage/nextPage. Less RAM usage, should work with all Arduino boards.
    U8x8 Text Only Example: No RAM usage, direct communication with display controller. No graphics, 8x8 Text only.
    
  This is a page buffer example.    
*/

// Please UNCOMMENT one of the contructor lines below
// U8g2 Contructor List (Picture Loop Page Buffer)
// The complete list is available here: https://github.com/olikraus/u8g2/wiki/u8g2setupcpp
// Please update the pin numbers according to your setup. Use U8X8_PIN_NONE if the reset pin is not connected

U8G2_SSD1306_128X64_NONAME_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);   // All Boards without Reset of the Display

// End of constructor list

#define SUN    0
#define SUN_CLOUD  1
#define CLOUD 2
#define RAIN 3
#define THUNDER 4

char i=0;
/********************************************************************/
// Data wire is plugged into pin 2 on the Arduino 
#define ONE_WIRE_BUS 2 
/********************************************************************/
// Setup a oneWire instance to communicate with any OneWire devices  
// (not just Maxim/Dallas temperature ICs) 
OneWire oneWire(ONE_WIRE_BUS); 
/********************************************************************/
// Pass our oneWire reference to Dallas Temperature. 
DallasTemperature sensors(&oneWire);
/********************************************************************/ 

void drawWeatherSymbol(u8g2_uint_t x, u8g2_uint_t y, uint8_t symbol)
{
  // fonts used:
  // u8g2_font_open_iconic_embedded_6x_t
  // u8g2_font_open_iconic_weather_6x_t
  // encoding values, see: https://github.com/olikraus/u8g2/wiki/fntgrpiconic
  
  switch(symbol)
  {
    case SUN:
      u8g2.setFont(u8g2_font_open_iconic_weather_6x_t);
      u8g2.drawGlyph(x, y, 69);    
      break;
    case SUN_CLOUD:
      u8g2.setFont(u8g2_font_open_iconic_weather_6x_t);
      u8g2.drawGlyph(x, y, 65);    
      break;
    case CLOUD:
      u8g2.setFont(u8g2_font_open_iconic_weather_6x_t);
      u8g2.drawGlyph(x, y, 64);    
      break;
    case RAIN:
      u8g2.setFont(u8g2_font_open_iconic_weather_6x_t);
      u8g2.drawGlyph(x, y, 67);    
      break;
    case THUNDER:
      u8g2.setFont(u8g2_font_open_iconic_embedded_6x_t);
      u8g2.drawGlyph(x, y, 67);
      break;      
  }
}

void drawWeather(uint8_t symbol, int degree)
{
  drawWeatherSymbol(0, 55, symbol);
  u8g2.setFont(u8g2_font_logisoso32_tf);
  u8g2.setCursor(48+3, 55);
  u8g2.print(degree);
  u8g2.print("°C");        // requires enableUTF8Print()
}

/*
  Draw a string with specified pixel offset. 
  The offset can be negative.
  Limitation: The monochrome font with 8 pixel per glyph
*/
void drawScrollString(int16_t offset, const char *s)
{
  static char buf[36];    // should for screen with up to 256 pixel width 
  size_t len;
  size_t char_offset = 0;
  u8g2_uint_t dx = 0;
  size_t visible = 0;
  len = strlen(s);
  if ( offset < 0 )
  {
    char_offset = (-offset)/8;
    dx = offset + char_offset*8;
    if ( char_offset >= u8g2.getDisplayWidth()/8 )
      return;
    visible = u8g2.getDisplayWidth()/8-char_offset+1;
    strncpy(buf, s, visible);
    buf[visible] = '\0';
    u8g2.setFont(u8g2_font_8x13_mf);
    u8g2.drawStr(char_offset*8-dx, 62, buf);
  }
  else
  {
    char_offset = offset / 8;
    if ( char_offset >= len )
      return;    // nothing visible
    dx = offset - char_offset*8;
    visible = len - char_offset;
    if ( visible > u8g2.getDisplayWidth()/8+1 )
      visible = u8g2.getDisplayWidth()/8+1;
    strncpy(buf, s+char_offset, visible);
    buf[visible] = '\0';
    u8g2.setFont(u8g2_font_8x13_mf);
    u8g2.drawStr(-dx, 62, buf);
  }
  
}

void draw(const char *s, uint8_t symbol, int degree)
{
  int16_t offset = -(int16_t)u8g2.getDisplayWidth();
  int16_t len = strlen(s);
  for(;;)
  {
    u8g2.firstPage();
    do {
      drawWeather(symbol, degree);
     // drawScrollString(offset, s);
    } while ( u8g2.nextPage() );
    delay(20);
    offset+=2;
    if ( offset > len*8+1 )
      break;
  }
}

void setup(void) {

  /* U8g2 Project: SSD1306 Test Board */
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);

  /* U8g2 Project: T6963 Test Board */
  //pinMode(18, OUTPUT);
  //digitalWrite(18, 1);    

  /* U8g2 Project: KS0108 Test Board */
  //pinMode(16, OUTPUT);
  //digitalWrite(16, 0);    

  /* U8g2 Project: LC7981 Test Board, connect RW to GND */
  //pinMode(17, OUTPUT);
  //digitalWrite(17, 0);    

  /* U8g2 Project: Pax Instruments Shield: Enable Backlight */
  //pinMode(6, OUTPUT);
  //digitalWrite(6, 0);    

  u8g2.begin();  
  u8g2.enableUTF8Print();
  sensors.begin(); 
}

void loop(void) {
  
  sensors.requestTemperatures();
  
  u8g2.firstPage();
  do {
     drawWeather(SUN_CLOUD, sensors.getTempCByIndex(0));
  } while ( u8g2.nextPage() );
    
  delay(1000);
}

或在项目文件库中下载。
https://make.quwj.com/project/180