Arduino Room Comfort Thermometer

#include "Wire.h"    // imports the wire library for talking over I2C 
#include <OneWire.h>
#include <DallasTemperature.h>
#include <Adafruit_NeoPixel.h>
#define ONE_WIRE_BUS 5

OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature sensors(&oneWire);
 float Celcius=0;

 int buttonPin = 2;    // momentary push button on pin 0
    int oldButtonVal = 0;

#define NUM_PIXEL 50 
#define PIN 6 
Adafruit_NeoPixel strip = Adafruit_NeoPixel(NUM_PIXEL, PIN, NEO_GRB + NEO_KHZ800); 




 int nPatterns = 3;
    int lightPattern = 1;
int out =0;
int t =0;

void setup() 
{
  Serial.begin(9600); //turn on serial monitor
strip.begin();
clearStrip();
strip.show();
strip.setBrightness(10);
pinMode(buttonPin, INPUT);
    digitalWrite(buttonPin, HIGH);  // button pin is HIGH, so it drops to 0 if pressed

sensors.begin();

}
void testing(){
  for(int L = 0; L<50; L++) { 
clearStrip();
    strip.setPixelColor(L,wheel(((205+(L*3)) & 255)));//Gradient from blue (cold) to green (ok) to red (warm), first value here 205 = start color, second value here 42 = end color
 strip.show();
delay(100);
}
for(int L = 49; L>=0; L--) { 
clearStrip();
    strip.setPixelColor(L,wheel(((205+(L*3)) & 255)));//Gradient from blue (cold) to green (ok) to red (warm), first value here 205 = start color, second value here 42 = end color

strip.show();
delay(100);
}
delay(1000);
}
void dot() {
   sensors.requestTemperatures(); 
   Celcius=sensors.getTempCByIndex(0)*2;
  
int t = map(Celcius, 20, 70, 0, NUM_PIXEL);

for(uint16_t L = 0; L<t; L++) { 
clearStrip();
strip.setPixelColor(L,wheel(((205+(L*3)) & 255))); //Gradient from blue (cold) to green (ok) to red (warm), first value here 205 = start color, second value here 42 = end color
} 
strip.show(); //Output on strip 
Serial.print("The Temperature is: ");
Serial.print(Celcius);

delay(1000); 
} 

void line() {
   sensors.requestTemperatures(); 
   Celcius=sensors.getTempCByIndex(0)*2;
  
int t = map(Celcius, 20, 70, 0, NUM_PIXEL);

for(uint16_t L = 0; L<t; L++) { 

strip.setPixelColor(L,wheel(((205+(L*3)) & 255))); //Gradient from blue (cold) to green (ok) to red (warm), first value here 205 = start color, second value here 42 = end color
} 
strip.show(); //Output on strip 
Serial.print("The Temperature is: ");
Serial.print(Celcius);

delay(1000); 
} 

void loop() {
  // read that stapressurete of the pushbutton value;
  int buttonVal = digitalRead(buttonPin);
  if (buttonVal == LOW && oldButtonVal == HIGH) {// button has just been pressed
    lightPattern = lightPattern + 1;
  }
  if (lightPattern > nPatterns) lightPattern = 1;
  oldButtonVal = buttonVal;
  
  switch(lightPattern) {
    case 1:
      dot();
      break;
    case 2:
   line();
      break;
      case 3:
      testing();
      break;
       }
}
//Color wheel ################################################################ 
uint32_t wheel(byte WheelPos) { 
if(WheelPos < 85) { 
return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0); 
} 
else if(WheelPos < 205) { 
WheelPos -= 85; 
return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3); 
} 
else { 
WheelPos -= 205; 
return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3); 
} 
} 
void clearStrip(){ 
for(int i = 0; i < NUM_PIXEL; i++) { 
strip.setPixelColor(i, 0); 
} 
}