STM32G031とGP2Y0A21YK(赤外線距離センサー)で6cmから80cmを求める。 I2C(0x80 7bit(0x40))出力

目的
adcのテスト用
赤外線距離センターを使い距離を測る。

どうしてこうなったかは、6-10,10-20,20-80を参考



![o_con322.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/43c04b5a-e804-391f-fa91-33e477ddd4f1.jpeg)



https://qiita.com/caa45040/items/5032e6905c9425f41495



メインプログラム



```c++


//ir_length_d_031_1

#include <Arduino.h>
#include <Wire.h>


#include "I2C_OUT_0X80_031_1.h"


//80-20
unsigned char qq[] = {
  80, 78, 77, 76, 75, 75, 74, 73, 72, 71,
  70, 69, 68, 68, 67, 66, 65, 65, 64, 63,
  63, 62, 61, 61, 60, 60, 59, 58, 58, 57,
  57, 56, 56, 55, 55, 54, 54, 53, 53, 52,
  52, 51, 51, 50, 50, 50, 49, 49, 48, 48,
  47, 47, 47, 46, 46, 46, 45, 45, 45, 44,
  44, 44, 43, 43, 43, 42, 42, 42, 41, 41,
  41, 41, 40, 40, 40, 40, 39, 39, 39, 38,
  38, 38, 38, 37, 37, 37, 37, 37, 36, 36,
  36, 36, 35, 35, 35, 35, 35, 34, 34, 34,
  34, 34, 33, 33, 33, 33, 33, 32, 32, 32,
  32, 32, 32, 31, 31, 31, 31, 31, 31, 30,
  30, 30, 30, 30, 30, 30, 29, 29, 29, 29,
  29, 29, 28, 28, 28, 28, 28, 28, 28, 28,
  27, 27, 27, 27, 27, 27, 27, 27, 26, 26,
  26, 26, 26, 26, 26, 26, 25, 25, 25, 25,
  25, 25, 25, 25, 25, 25, 24, 24, 24, 24,
  24, 24, 24, 24, 24, 24, 23, 23, 23, 23,
  23, 23, 23, 23, 23, 23, 22, 22, 22, 22,
  22, 22, 22, 22, 22, 22, 22, 22, 21, 21,
  21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
  21, 20, 20, 20, 20, 20, 20, 20, 20, 20,
  20, 20, 20, 20, 20, 20
};

//20-10
unsigned char pp[] = {
  200, 199, 198, 197, 196, 196, 195, 194, 193, 193,
  192, 191, 190, 190, 189, 188, 187, 187, 186, 185,
  185, 184, 183, 183, 182, 181, 181, 180, 179, 179,
  178, 177, 177, 176, 176, 175, 174, 174, 173, 173,
  172, 171, 171, 170, 170, 169, 168, 168, 167, 167,
  166, 166, 165, 165, 164, 163, 163, 162, 162, 161,
  161, 160, 160, 159, 159, 158, 158, 157, 157, 156,
  156, 155, 155, 154, 154, 153, 153, 152, 152, 151,
  151, 151, 150, 150, 149, 149, 148, 148, 147, 147,
  147, 146, 146, 145, 145, 144, 144, 144, 143, 143,
  142, 142, 142, 141, 141, 140, 140, 140, 139, 139,
  138, 138, 138, 137, 137, 136, 136, 136, 135, 135,
  135, 134, 134, 134, 133, 133, 132, 132, 132, 131,
  131, 131, 130, 130, 130, 129, 129, 129, 128, 128,
  128, 127, 127, 127, 126, 126, 126, 125, 125, 125,
  125, 124, 124, 124, 123, 123, 123, 122, 122, 122,
  121, 121, 121, 121, 120, 120, 120, 119, 119, 119,
  119, 118, 118, 118, 117, 117, 117, 117, 116, 116,
  116, 116, 115, 115, 115, 114, 114, 114, 114, 113,
  113, 113, 113, 112, 112, 112, 112, 111, 111, 111,
  111, 110, 110, 110, 110, 109, 109, 109, 109, 108,
  108, 108, 108, 107, 107, 107, 107, 107, 106, 106,
  106, 106, 105, 105, 105, 105, 105, 104, 104, 104,
  104, 103, 103, 103, 103, 103, 102, 102, 102, 102,
  102, 101, 101, 101, 101, 101, 100, 100, 100, 100,
  100
};

//10-6
unsigned char oo[] = {
  100, 99, 98, 98, 97, 97, 96, 96, 95, 95,
  94, 94, 93, 93, 92, 92, 91, 91, 90, 90,
  90, 89, 89, 88, 88, 87, 87, 86, 86, 86,
  85, 85, 84, 84, 84, 83, 83, 82, 82, 82,
  81, 81, 81, 80, 80, 80, 79, 79, 78, 78,
  77, 77, 76, 76, 75, 75, 74, 74, 74, 73,
  73, 72, 72, 71, 71, 71, 70, 70, 69, 69,
  68, 67, 66, 66, 65, 64, 63, 63, 62, 61,
  61, 60, 60
};


//赤外線距離センサー(GP2Y0A21YK)の電圧から距離を求める。
//Voltage //電圧
int ir_len_i(int Voltage)
{

  int ir_length;   //長さ

  if (Voltage >= 0    && Voltage <= 400 ) {
    return (800);
  }
  if (Voltage >= 3120 && Voltage <= 5000) {
    return (60);
  }

  if        (Voltage >= 400 && Voltage <= 1300 ) { //80-20

    ir_length = (int)qq[(Voltage - 400) >> 2];
    ir_length = ir_length * 10;

  } else if (Voltage >= 1300 && Voltage <= 2300 ) { //20-10

    ir_length = (int)pp[(Voltage - 1300) >> 2];

  } else if (Voltage >= 2300 && Voltage <= 3120  ) { //10-6

    ir_length = (int)oo[(Voltage - 2300) / 10];

  }//end if

  //戻り値
  return (ir_length);

} //ir_le_i


//初期化
void setup() {

  //i2cの初期化
  pc.beginNS(9600);

}//setup


//メインループ
void loop() {

  int sensorValue; //センサーの読み取り値
  int Voltage;     //電圧
  int ir_length;   //長さ

  //アナログ値の読み込み

  analogReadResolution(12); //adc 12bit mode
  //sensorValue = analogRead(A3); // PA11 PIN5 031
  sensorValue = analogRead(A9); // PB7  PIN1 031

  //sensorValue = analogRead(A0); //UNO


  //アナログ値を電圧に変換

  Voltage = (sensorValue * 3300) >> 12; //stm32

  //V <- S*4.882 UNO +-1mV
  //Voltage = ((sensorValue * 8) + ( (sensorValue * 8) / 10 ) + ( (sensorValue * 2) / 100 )) / 10  + (sensorValue * 4);


  //赤外線距離センサー(GP2Y0A21YK)の電圧から距離を求める。
  ir_length = ir_len_i(Voltage);


  //値の表示
  //pc.printNS(sensorValue);
  pc.printNS("800");
  pc.printNS(",");

  //前の0を削る
  //  0123  add
  // [1234] data
  int yy = 0;
  if     (ir_length >= 1000) {
    yy = 0;
  }
  else if (ir_length >= 100) {
    yy = 1;
  }
  else if (ir_length >= 10)  {
    yy = 2;
  }
  else                      {
    yy = 3;
  }

  pc.printNS( (char *)(ch_hex_a(ir_length) + yy) );

  pc.printNS(",");
  pc.printNS("0");



  //リターン
  pc.printNS("\r\n");



  delay(10);// 1/100秒待つ

}//loop






```



I2C_OUT_0X80_031_1.hのプログラム



```c++



#ifndef TEST_H
#define TEST_H

//I2C_OUT_0X80_031_1


//10の割り算 0から1028までは、正しい。主に0から999
#define DIV10(n) ((n*205)>>11)

char ch_hex_a_b[16];
char *ch_hex_a(int x)
{

    ch_hex_a_b[4] = 0;

    if       ( x >= 9000 ) {x = x - 9000; ch_hex_a_b[0] = '9';
    } else if( x >= 8000 ) {x = x - 8000; ch_hex_a_b[0] = '8';
    } else if( x >= 7000 ) {x = x - 7000; ch_hex_a_b[0] = '7';
    } else if( x >= 6000 ) {x = x - 6000; ch_hex_a_b[0] = '6';
    } else if( x >= 5000 ) {x = x - 5000; ch_hex_a_b[0] = '5';
    } else if( x >= 4000 ) {x = x - 4000; ch_hex_a_b[0] = '4';
    } else if( x >= 3000 ) {x = x - 3000; ch_hex_a_b[0] = '3';
    } else if( x >= 2000 ) {x = x - 2000; ch_hex_a_b[0] = '2';
    } else if( x >= 1000 ) {x = x - 1000; ch_hex_a_b[0] = '1';
    } else                 {              ch_hex_a_b[0] = '0';
    }//if

    ch_hex_a_b[3] = '0' + (  x - (DIV10(x) * 10)  );  // 3  <- 120 - 123
    x = DIV10(x);                                     // 12 <= 123 / 10
    ch_hex_a_b[2] = '0' + (  x - (DIV10(x) * 10)  );  // 2  <- 12 - 10
    ch_hex_a_b[1] = '0' +  DIV10(x);                  // 1  <- 12 / 10

    return(ch_hex_a_b);

} //ch_hex_a


//クラスの定義
struct _pc
{
  void beginNS(int sp);      //メソッドの宣言
  int  putcNS(char ch);      //メソッドの宣言
  int  printNS(char *str1);  //メソッドの宣言
  int  printNS(int num);     //メソッドの宣言 オーバーロード
};


#define ADDR1  0x40

//STM32G031J6M6 i2cピンの定義
#define sdaPin PA12    // ArduinoA4
#define sclPin PA11    // ArduinoA5


//ポートをhiにする 初期化
//メソッドの定義
void _pc::beginNS(int sp)
{
  //i2cの初期化
  Wire.begin(sdaPin, sclPin); //STM32G031J6M6
}


//仮想シリアルへの一文字出力 9600bps
//メソッドの定義
int _pc::putcNS(char ch)
{
  //I2Cに送信
  Wire.beginTransmission(ADDR1);
  Wire.write( ch );
  Wire.endTransmission();

  delay(1);//連続送信防止の為に1ms待つ

  //戻り値
  return (0);
}


//文字列の表示
//メソッドの定義
int _pc::printNS(char *str1)
{
  //文字の中身がゼロか
  while (*str1) {

    //一文字出力
    putcNS(*str1 ++);

  } //while

  //戻り値
  return (0);
}


//文字列の表示 オーバーロード 4桁
//メソッドの定義
int _pc::printNS(int num)
{
  if(num < 0) { putcNS('-'); num = 0 - num;   }
    
  char *str1 = ch_hex_a(num);
  
  //文字の中身がゼロか
  while (*str1) {

    //一文字出力
    putcNS(*str1 ++);

  } //while

  //戻り値
  return (0);
}


//実体の作成
_pc pc;


#endif





```