Arduino+DS18b20+OLED Display

DS18b20获取到温度数值保存到变量中，然后和天气图标还有滚动字幕一起发送到OLED 屏幕上显示

需要用到的库均可在Arduino库管理器下载。

电路图：

图中屏幕接线已在代码中写出，温度传感器date口需要接一个4.7k欧的电阻；

最终效果如下图：

代码如下：

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

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

// DS18b20数据输出脚接开发板数字引脚
#define ONE_WIRE_BUS 8

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif
//选择自己的屏幕驱动
U8G2_SSD1306_128X64_NONAME_F_4W_SW_SPI u8g2(U8G2_R0, /* clock=*/ 4, /* data=*/ 5, /* cs=*/ 3, /* dc=*/ 7, /* reset=*/ 6);

#define SUN_CLOUD  1
//绘制天气图标
void drawWeatherSymbol(u8g2_uint_t x, u8g2_uint_t y, uint8_t symbol)
{
  switch(symbol)
  {
    case SUN_CLOUD:
      u8g2.setFont(u8g2_font_open_iconic_weather_6x_t);
      u8g2.drawGlyph(x, y, 65);
      break;
  }
}
//绘制显示界面
void drawWeather(uint8_t symbol, int val)
{
  //绘制天气符号
  drawWeatherSymbol(0, 48, symbol);
  //绘制温度
  u8g2.setFont(u8g2_font_logisoso32_tf);
  u8g2.setCursor(48+3, 42);
  u8g2.print(val);
  u8g2.print("°C");   // requires enableUTF8Print()
}
//绘制滚动字幕
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;

  u8g2.setDrawColor(0);   // clear the scrolling area
  u8g2.drawBox(0, 49, u8g2.getDisplayWidth()-1, u8g2.getDisplayHeight()-1);
  u8g2.setDrawColor(1);   // set the color for the text

  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 val)
{
  int16_t offset = -(int16_t)u8g2.getDisplayWidth();
  int16_t len = strlen(s);

  u8g2.clearBuffer();         // clear the internal memory
  drawWeather(symbol, val);    // draw the icon and degree only once
  for(;;)             // then do the scrolling
  {

    drawScrollString(offset, s);        // no clearBuffer required, screen will be partially cleared here
    u8g2.sendBuffer();        // transfer internal memory to the display

    delay(20);
    offset+=2;
    if ( offset > len*8+1 )
      break;
  }
}

void setup(void) {
  Serial.begin(9600);
  sensors.begin(); //初始化DS18b20
  u8g2.begin();  //初始化OLED
  u8g2.enableUTF8Print();//打开UTF8输出
}

void loop(void) {
    sensors.requestTemperatures(); // 发送命令获取温度
    int val = sensors.getTempCByIndex(0);//将获取到的温度数值保存在变量中
    draw("What a beautiful day!", SUN_CLOUD, val);//调用函数绘制最终界面
}