ArduinoUNO와 온도 센서 MCP9701로 액정 표시 (Arduino) (AQM0802A)

#include <Wire.h> //I2C library

//STM32G031J6M6
#define sdaPin PA12    // ArduinoA4
#define sclPin PA11    // ArduinoA5

// I2C  address. 
#define I2Cadr  0x3e  // 固定

int     tempval;                //温度
char    data_read[2]={'@','t'}; //i2cバッファー
int     ii;                     //ループカウンター

char INIT_com[]={0x0,0x38,
0x0,0x39,
0x0,0x4,
0x0,0x14,
0x0,0x70,
0x0,0x56,
0x0,0x6C,
0x0,0x38,
0x0,0xC,
0x0,0x1,
0x40,0x41};

char INIT_cls[]={0x0,0x1};

void i2c_led_w(char *buff1){
  Wire.beginTransmission(I2Cadr);
  Wire.write(buff1[0]);
  Wire.write(buff1[1]);
  Wire.endTransmission();
  delay(2);
}//i2c_led_w

void setup()
{  

  //i2cの初期化
  Wire.begin(); // initialise the connection //767 UNO
  //Wire.begin(sdaPin,sclPin); //STM32G031J6M6

  //液晶の初期化
  for(ii=0;ii<11;ii++){
    i2c_led_w(&INIT_com[ii*2]);
  } //for

} //end setup

void loop()
{

  //画面のクリア
  i2c_led_w(INIT_cls);

  //センサーの値を読み込む
  tempval = analogRead(A0); // UNO

  //tempval = 20 << 2; //0  debug
  //tempval = 40 << 2; //20 debug

  //センサーの値を温度に変換
  tempval = (tempval >> 2) - 20;

  //液晶に表示
  data_read[1] = '0' + (tempval / 10);
  i2c_led_w(data_read);
  data_read[1] = '0' + (tempval % 10);
  i2c_led_w(data_read);

  delay(1000); //1秒待つ
}//loop