microbit-adc-2/main.cpp, micro:bit adc read, P0

main.cpp

//microbit-adc-2/main.cpp

#include "mbed.h"

#include <stdio.h>
#include <string>
Serial mPc(USBTX, USBRX);
AnalogIn mySensor(P0_3 );

//
long convert_Map(long x, long in_min, long in_max, long out_min, long out_max) {
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}

// reading LM60BIZ
int getTempNum(){
    int iRet=0;
    //unsigned long reading  = 0;   
    float read=0;
    for (int i=0; i<10; i++) {
      //  reading= P0.getAnalogValue();
        read= mySensor.read();
//      delay(100);
    }
    read =read * 1000;
    mPc.printf("read=%d\n" , (int)read ) ;
//    mPc.printf("read=%f\n" ,  read ) ;
    
    int voltage=convert_Map((int) read , 0, 1000, 0,3300);  // V
    mPc.printf("v=%d\n" ,voltage);
    int iTemp = (voltage - 424) / 6.25;
    iRet= iTemp;
    return iRet;
}

//
int main() {
    mPc.baud( 115200 );
    mPc.printf("#start-microbit-adc-2 \n");
//    AnalogIn mySensor(P0_3 );
    while (true)
    {
//        mPc.printf("%f\r\n" ,mySensor.read() );
        int iT1 =getTempNum();
        mPc.printf( "iT1=%d\n",iT1) ;
        wait(1.0 );
    }
    return 0;
}