（一）简介
我们之前学习了OLED屏幕和DHT11温湿度传感器，那么就可以做一个简单的温湿度计项目
通过OLED屏幕可以显示DHT11的温湿度数据
OLED教程：【Arduino uno教程 】（七）0.96寸OLED屏幕
DHT11教程：【Arduino uno教程 】（九）DHT11温湿度传感器

（二）程序
①引入库文件
  1. #include <dht11.h>
  2. #include <U8g2lib.h>
  3. #include <Wire.h>

②定义
定义SCL引脚A5，SDA引脚A4
设置U8G2屏幕库引脚，并且设置屏幕
定义DHT11传感器和引脚
  1. #define BOARD_I2C_SCL   A5
  2. #define BOARD_I2C_SDA   A4   

  4. U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ BOARD_I2C_SCL, /* data=*/ BOARD_I2C_SDA, /* reset=*/ U8X8_PIN_NONE);  

  6. dht11 DHT11;//定义传感器类型
  7. #define DHT11PIN 2//定义传感器连接引脚。


③定义“温湿度”三个字的字模
  1. uint8_t day[][32] =
  2. {
  3. {0x00,0x00,0xC4,0x1F,0x48,0x10,0x48,0x10,0xC1,0x1F,0x42,0x10,0x42,0x10,0xC8,0x1F,
  4. 0x08,0x00,0xE4,0x3F,0x27,0x25,0x24,0x25,0x24,0x25,0x24,0x25,0xF4,0x7F,0x00,0x00},/*"温",0*/

  6. {0x00,0x00,0xE4,0x1F,0x28,0x10,0x28,0x10,0xE1,0x1F,0x22,0x10,0x22,0x10,0xE8,0x1F,
  7. 0x88,0x04,0x84,0x04,0x97,0x24,0xA4,0x14,0xC4,0x0C,0x84,0x04,0xF4,0x7F,0x00,0x00},/*"湿",1*/

  9. {0x80,0x00,0x00,0x01,0xFC,0x7F,0x44,0x04,0x44,0x04,0xFC,0x3F,0x44,0x04,0x44,0x04,
  10. 0xC4,0x07,0x04,0x00,0xF4,0x0F,0x24,0x08,0x42,0x04,0x82,0x03,0x61,0x0C,0x1C,0x70},/*"度",2*/

  12. };


④初始化函数
设置串口通信，波特率位115200
设置U8G2初始化，并且设置字体
  1. void setup()
  2. {  
  3.   Serial.begin(115200);  
  4.   Serial.println("Init u8g2 ....");
  5.   u8g2.begin();
  6.   u8g2.setFont(u8g2_font_ncenB08_tr); //设置字体
  7. }


⑤循环函数
设置temp和humi两个整数型变量
DHT11读取传感器信息
将DHT11传感器的数据保存在变量内
每次更新屏幕时，都清除缓存
U8G2设置中文和变量，并且将屏幕上传缓存区
  1. void loop() {
  2.   int temp = 0;
  3.   int humi = 0;
  4.   DHT11.read(DHT11PIN); //更新传感器所有信息
  5.   
  6.   
  7.   humi = DHT11.humidity;
  8.   temp = DHT11.temperature;
  9.   

  11.   u8g2.clearBuffer();  //清除缓存     

  13.   u8g2.drawXBM(2,2,16,16,day[0]);
  14.   u8g2.drawXBM(18,2,16,16,day[2]);

  16.   u8g2.drawXBM(2,30,16,16,day[1]);
  17.   u8g2.drawXBM(18,30,16,16,day[2]);

  19.   u8g2.setCursor (50, 14);
  20.   u8g2.println(temp);

  22.   u8g2.setCursor (50, 42);
  23.   u8g2.println(humi);
  24.   
  25.   u8g2.sendBuffer();


  28.   Serial.print("当前温度 (℃): ");
  29.   Serial.println(temp);

  31.   Serial.print("当前湿度 (%): ");
  32.   Serial.println(humi);


  35.   delay(2000);


⑥现象展示
9e2da6814e00b72247447a502f11b78.jpg


⑦完整代码
  1. #include <dht11.h>//引入DHT11库
  2. #include <U8g2lib.h>
  3. #include <Wire.h>

  5. #define BOARD_I2C_SCL   A5
  6. #define BOARD_I2C_SDA   A4   

  8. U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ BOARD_I2C_SCL, /* data=*/ BOARD_I2C_SDA, /* reset=*/ U8X8_PIN_NONE);  

  10. /********************###定义###********************/
  11. dht11 DHT11;//定义传感器类型
  12. #define DHT11PIN 2//定义传感器连接引脚。

  14. uint8_t day[][32] =
  15. {
  16. {0x00,0x00,0xC4,0x1F,0x48,0x10,0x48,0x10,0xC1,0x1F,0x42,0x10,0x42,0x10,0xC8,0x1F,
  17. 0x08,0x00,0xE4,0x3F,0x27,0x25,0x24,0x25,0x24,0x25,0x24,0x25,0xF4,0x7F,0x00,0x00},/*"温",0*/

  19. {0x00,0x00,0xE4,0x1F,0x28,0x10,0x28,0x10,0xE1,0x1F,0x22,0x10,0x22,0x10,0xE8,0x1F,
  20. 0x88,0x04,0x84,0x04,0x97,0x24,0xA4,0x14,0xC4,0x0C,0x84,0x04,0xF4,0x7F,0x00,0x00},/*"湿",1*/

  22. {0x80,0x00,0x00,0x01,0xFC,0x7F,0x44,0x04,0x44,0x04,0xFC,0x3F,0x44,0x04,0x44,0x04,
  23. 0xC4,0x07,0x04,0x00,0xF4,0x0F,0x24,0x08,0x42,0x04,0x82,0x03,0x61,0x0C,0x1C,0x70},/*"度",2*/

  25. };


  28. void setup()
  29. {  
  30.   Serial.begin(115200);  
  31.   Serial.println("Init u8g2 ....");
  32.   u8g2.begin();
  33.   u8g2.setFont(u8g2_font_ncenB08_tr); //设置字体
  34. }

  36. void loop() {
  37.   int temp = 0;
  38.   int humi = 0;
  39.   DHT11.read(DHT11PIN); //更新传感器所有信息
  40.   
  41.   
  42.   humi = DHT11.humidity;
  43.   temp = DHT11.temperature;
  44.   

  46.   u8g2.clearBuffer();  //清除缓存     

  48.   u8g2.drawXBM(2,2,16,16,day[0]);
  49.   u8g2.drawXBM(18,2,16,16,day[2]);

  51.   u8g2.drawXBM(2,30,16,16,day[1]);
  52.   u8g2.drawXBM(18,30,16,16,day[2]);

  54.   u8g2.setCursor (50, 14);
  55.   u8g2.println(temp);

  57.   u8g2.setCursor (50, 42);
  58.   u8g2.println(humi);
  59.   
  60.   u8g2.sendBuffer();


  63.   Serial.print("当前温度 (℃): ");
  64.   Serial.println(temp);

  66.   Serial.print("当前湿度 (%): ");
  67.   Serial.println(humi);


  70.   delay(2000);

  72. }