x かころぐみよ
参考
結果

/*
/* Grove - Temperature Sensor demo v1.0
*  This sensor detects the environment temperature,
*  Connect the signal of this sensor to A0, use the
*  Serial monitor to get the result.
*  By: https://www.seeedstudio.com
*/
#include <math.h>
int a;
float temperature;
int B=3975;                  //B value of the thermistor
float resistance;

void setup()
{
    Serial.begin(9600);
}

void loop()
{
    //a=analogRead(0);
    //a=analogRead(15);
    a=analogRead(1);
    //resistance=(float)(1023-a)*10000/a; //get the resistance of the sensor;

    float v1,a1,o1; 
    v1 = ((float)a) * 0.001;      //電圧を求める
    a1 = v1 / 10000.0;            //電流を求める
    o1 = 5.0 / a1;                //全体の抵抗を求める
    resistance = o1 - 10000.0;    //全体の抵抗から検出抵抗を引く
    //Serial.println(v1); //debug
        
    temperature=1/(log(resistance/10000)/B+1/298.15)-273.15;//convert to temperature via datasheet&nbsp;;
    delay(1000);
    Serial.print("Current temperature is ");
    Serial.println(temperature);
}