第三篇、基于Arduino uno，用oled0.96寸屏幕显示dht11温湿度传感器的温度和湿度信息——结果导向

0、结果

说明：先来看看拍摄的显示结果，如果是你想要的，可以接着往下看。

1、外观

说明：本次使用的oled是0.96寸的，别的规格的屏幕不一定适用本教程，一般而言有显示白色、蓝色和蓝黄一起显示的，虽然dht11温湿度模块形态各异，但是代码都是适用的，因为它们的模块都是一样的。

2、连线

说明：只需要连接三根线。

uno————dht11

    5V--------------VCC
GND--------------GND

    D7--------------DATA

说明：只需要连接四根线。

uno————oled 0.96

    5V--------------VCC
GND--------------GND

 SCL--------------SCL

 SDA--------------SDA

3、源程序

说明：采用非阻塞方式编写，一定时间检测和显示一次温湿度数据，并将对应功能进行函数化，方便移植。

/****************************************dht11 part****************************************/
#include <dht11.h>                                      //include library
#define dht11Pin 7                                      //Define DHT11 sensor connection pins
#define dht11TimeInterval 1000                          //Detect the time interval of a tripdht11 DHT11;                                            //Instantiate an object
unsigned long dht11Times = 0;                           //Record the device running time
int dhtTemp = 0, dht11Humi = 0;                         //Storage temperature  //Storage humidity
/****************************************oled96 part****************************************/
#include <Arduino.h>                                                          //include library
#include <U8g2lib.h>                                                          //include library
#include <Wire.h>                                                             //include libraryU8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);#define oledTimeInterval 1000                                                 //Detect the time interval of a trip
unsigned long oledTimes = 0;                                                  // Record the device running time/****************************************set up and loop part*********************************/
void setup() {u8g2.begin();                                                               //Example Initialize the IIC
}
void loop() {getTempData();                                                              //Obtain the temperature and humidity valuesoledDisplayMath();                                                          //Display math
}
/****************************************oled96 part****************************************/
/*Display math*/
void oledDisplayMath() {if (millis() - oledTimes >= oledTimeInterval) {                              //This command is executed once in a whileoledTimes = millis();u8g2.setFont(u8g2_font_ncenB14_tr);                                         //u8g2_font_6x12_tru8g2.setFontDirection(0);u8g2.firstPage();do {u8g2.setCursor(0, 15);                                                    //0 means start at the first column and 15 means end at row 15u8g2.print("Temp:");u8g2.setCursor(64, 15);                                                    //0 means start at the first column and 15 means end at row 15u8g2.print(dhtTemp);u8g2.setCursor(96, 15);                                                    //0 means start at the first column and 15 means end at row 15u8g2.print(" C");u8g2.setCursor(0, 31);                                                    //0 means start at the first column and 15 means end at row 15u8g2.print("Humi: ");u8g2.setCursor(64, 31);u8g2.print(dht11Humi);u8g2.setCursor(96, 31);                                                    //0 means start at the first column and 15 means end at row 15u8g2.print(" %");} while ( u8g2.nextPage() );}
}
/****************************************dht11 part****************************************/
/*Obtain the temperature and humidity values*/
void getTempData() {if (millis() - dht11Times >= dht11TimeInterval) {dht11Times = millis();DHT11.read(dht11Pin);                               //Update all sensor informationdhtTemp = DHT11.temperature;dht11Humi = DHT11.humidity;Serial.print("Temperature: ");Serial.print(dhtTemp);Serial.print(" (C), ");Serial.print("Humidity: ");Serial.print(dht11Humi);Serial.println(" (%).");}
}

4、注意事项

说明：需要在线下载<u8glib.h>库文件和<dht11.h>库文件。