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测试代码，串口输出温度和湿度

#include "mbed.h"
#include "SHT21_ncleee.h"


DigitalOut myled(LED1);
I2C i2c(D14, D15);
SHT21 sht(&i2c);


int main() {

    printf("Hello World...\n Testing temperature and humidity sensor\n");
    
    float temperature;
    float humidity;
   

    while(1) {
        temperature = sht.readTemp();
        humidity = sht.readHumidity();
       
        
        printf("Temperature=%.1f Humidity=%.1f%%\n",temperature,humidity);
    
        myled = 1;
        wait(2.5);
        myled = 0;
        wait(2.5);
    }
}

就可以从串口看到采集的信息了，如果有网络就可以传到云上

查到的一些关于SHT2X传感器的资料

官方资料

http://www.sensirion.com/en/products/humidity-temperature/download-center/

中文文档

http://www.doc88.com/p-300249736621.html

Arduino库

https://github.com/sparkfun/HTU21D_Breakout

找到虚拟串口的编号，然后用arduino的ide打开就好了，默认波特率9600