This sketch read the voltage of a Grove temperature sensor and calculates the temperature in degrees C.

04.10_-_Grove_temperature_sensor.ino

/*  04.010 - Grove temperature sensor (Temperature Sensor V1.1/1.2)
 *   
   This sketch read the voltage of a Grove temperature sensor and
   calculates the temperature in degrees C.

   The temperature sensor is an analog sensor.
   
   
   Components
   ----------
    
    - Grove Base Shield
    - An Arduino Uno compatible board (such as Arduino/Genuino Uno or Seeeduino)
    - Grove Temperature Sensor V1.1/1.2
    - One Grove cable
    
    IDE
    ---
    
    Arduino IDE
    
    Libraries
    ---------
    
    - Math
    
    Connections
    -----------
    
    Use a Grove cable to connect the temperature module to Base Shield connector A0.
    
    Other information
    -----------------
    
    - Use this sketch along side the video lecture 04.010 of Grove For Busy People
    - Original sketch location: http://wiki.seeedstudio.com/Grove-Temperature_Sensor_V1.2/ by Loovee @ 2015-8-26
    - Grove component: https://txplo.re/4hc
    - Thermistor datasheet: http://www.mwftr.com/emblab/Temp%20Sensor%20-NCP18WF104F03RC.pdf
    - Thermistor model: NCP18WF104F03RC (NTC- Negative Temperature Coefficient)
    - Learn about temperature coefficient: https://en.wikipedia.org/wiki/Temperature_coefficient

    Github Gist
    -----------
    <script src="https://gist.github.com/futureshocked/79960bb8bebaa0ff5b1a4c7534a805e1.js"></script>

    https://gist.github.com/futureshocked/79960bb8bebaa0ff5b1a4c7534a805e1
    
    For course information, please go to https://techexplorations.com/product/grove-for-busy-people/
            
    Created on July 5 2019 by Peter Dalmaris
*/

#include <math.h>

const int B = 4275;               // B value of the thermistor
const int R0 = 100000;            // R0 = 100k
const int pinTempSensor = A0;     // Grove - Temperature Sensor connect to A0

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

void loop()
{
    int a = analogRead(pinTempSensor);
    float R = 1023.0/a-1.0;   
    R = R0*R;
    float temperature = 1.0/(log(R/R0)/B+1/298.15)-273.15; // convert to temperature via datasheet

    Serial.print("temperature = ");
    Serial.println(temperature);

    delay(100);
}