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
}
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