Code for an Arduino project - description here: https://medium.com/@samathy_barratt/an-electronics-project-presence-box-aca93d6c5d87

presenceBox

#include <CapacitiveSensor.h>
#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
  #include <avr/power.h>
#endif

#define CAPSENSORPIN 3
#define CAPCPIN 2

#define THERMRESISTORVAL 10000    
#define THERMISTORPIN A4

#define NEOPIN 5
#define NEONUMPIXELS 4

#define NEOBASELINE 30 //Baseline brightness

#define TEMPNOMINAL 19



Adafruit_NeoPixel pixels = Adafruit_NeoPixel(NEONUMPIXELS, NEOPIN, NEO_GRB + NEO_KHZ800);
CapacitiveSensor   cs_5_2 = CapacitiveSensor(CAPCPIN,CAPSENSORPIN);        // 10 megohm resistor between pins 4 & 2, pin 2 is sensor pin, add wire, foil

int currentRed;
int currentGreen;
int currentBlue;

int neofactor;

int readTemp()  //Read the temperature from the thermistor. Returns temp in degrees C
{
    float reading;
    
    reading = analogRead(THERMISTORPIN);
           
    // convert the value to resistance
    reading = (1023 / reading)  - 1;
    reading = THERMRESISTORVAL / reading;
    Serial.print("Thermistor resistance "); 
    Serial.println(reading);
    
    float steinhart;
    steinhart = reading / THERMRESISTORVAL;     // (R/Ro)
    steinhart = log(steinhart);                  // ln(R/Ro)
    steinhart /= 3950;                   // 1/B * ln(R/Ro)
    steinhart += 1.0 / (25 + 273.15); // + (1/To)
    steinhart = 1.0 / steinhart;                 // Invert
    steinhart -= 273.15;                         // convert to C
    
    return steinhart;
  
}

long readCapacitance()  //Read the capacitance from the proximity sensor. Return value.
{
    long prox =  cs_5_2.capacitiveSensor(30);

    return prox;
}


void changeAllPixels(int r, int g, int b)
{

        
        for (int i=0; i<NEONUMPIXELS;i++)
        {
            pixels.setPixelColor(i, pixels.Color(r,g,b-20));

        }

        pixels.show();

        delay(10);

    return;
}

float percent(int val, int perc)
{
  return val * perc / 100;
}



void setup()                    
{

   Serial.begin(9600);

   #if defined (__AVR_ATtiny85__)
      if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
   #endif

  pixels.begin(); // This initializes the NeoPixel library.
  neofactor = 10;

}

void loop()                    
{
    int temperature = readTemp();
    int proximity = readCapacitance();



      if (proximity >= (neofactor+20))
      {
          if (NEOBASELINE+neofactor+20 <= 210)
          {
              neofactor = neofactor+20;
          }
      }
      else if(proximity < (neofactor - 20))
      {
        neofactor = neofactor -20;
      }


    
    Serial.print("neofactor is:");
    Serial.println(neofactor);
    Serial.println(NEOBASELINE+neofactor+currentRed);
    
    

    Serial.println("Values are:");
    Serial.print("Temperature: ");
    Serial.println(temperature, DEC);
    Serial.print("Capacantance");
    Serial.println(proximity);


    if (temperature <= TEMPNOMINAL-1)
    {
      currentRed = TEMPNOMINAL-temperature;
        
      changeAllPixels(NEOBASELINE+neofactor+currentRed,0,NEOBASELINE+currentBlue);
    }
    else if (temperature >= TEMPNOMINAL+1)
    {
      currentBlue = TEMPNOMINAL+temperature;
      changeAllPixels(NEOBASELINE+currentRed,0,NEOBASELINE+neofactor+currentBlue);
    }
    else
    {
            changeAllPixels(NEOBASELINE+neofactor+(TEMPNOMINAL - 10),0,NEOBASELINE+neofactor+(TEMPNOMINAL- 10));
    }

    delay(1);

    
}