1.SCLとSDAを接続、プルアップも忘れずに
2.電源の接続
3.下記のソースコードを書き込む
4.コンパイル実行で表示されたら終了
5.おわり

注意
mbedのリビジョンは、125

x PA9,PA10は、いつも間違えるので各自確認のこと

いぞがしい人のために
https://os.mbed.com/users/caa45040/code/AQM0802A_010_test1/

参考
STM32L010のMbedでの温度,STTS751で温度表示(AQM0802A)(STM32L010F4P6)
https://qiita.com/caa45040/items/54b5d2a9425c38b0d908


#include "mbed.h"
 
#define ADDR     (0x7C) //  address
 
//I2C i2c(I2C_SDA, I2C_SCL);
I2C i2c(PA_10, PA_9);

//DigitalOut myled(LED1);
 
//Serial pc(SERIAL_TX, SERIAL_RX);
 
//volatile char TempCelsiusDisplay[] = "+abc.d C";

int main()
{
 
    char data_read[2];
  
    //init
    wait(0.2);

    data_read[0] = 0x0;

    data_read[1]=0x38;
    i2c.write(ADDR, data_read, 2);

    data_read[1]=0x39;
    i2c.write(ADDR, data_read, 2);

    data_read[1]=0x14;
    i2c.write(ADDR, data_read, 2);

    data_read[1]=0x70;
    i2c.write(ADDR, data_read, 2);

    data_read[1]=0x56;
    i2c.write(ADDR, data_read, 2);

    data_read[1]=0x6C;
    i2c.write(ADDR, data_read, 2);

    wait(0.2);

    data_read[1]=0x38;
    i2c.write(ADDR, data_read, 2);

    data_read[1]=0x0C;
    i2c.write(ADDR, data_read, 2);

    data_read[1]=0x01;
    i2c.write(ADDR, data_read, 2);

    wait(0.2);

    data_read[0]='@';
    data_read[1]='a';
    i2c.write(ADDR, data_read, 2);


    while (1) {

        // Display result
//        pc.printf("temp = %s\n", TempCelsiusDisplay);
//        myled = !myled;
        wait(2.0);

    }
 
}