I have connected my stripLED connected to a pin set as an output and I would like to control it with 3 or more pin inputs and I couldn't. Help me

[linges8]

#include "Arduino.h"
#include <FastLED.h>

#define LED_PIN 6 //LED Strip Signal Connection
#define SignalA 3
#define SignalB 4
#define SignalC 5
#define NUM_LEDS 120 //Total no of LEDs in the LED strip
#define BRIGHTNESS 50

int BlinkerSpeed1 = 20; //Turn Signal Running LED Speed
int BlinkerSpeed2 = 500;
CRGB leds[NUM_LEDS];

void setup() {
FastLED.addLeds<WS2812, LED_PIN, GRB>(leds, NUM_LEDS);
pinMode(SignalA, INPUT);
pinMode(SignalB, INPUT);
pinMode(SignalC, INPUT);
pinMode(LED_PIN, OUTPUT);
}

void loop() {

if((digitalRead(SignalA)==0)&&(digitalRead(SignalB)==0)&&(digitalRead(SignalC)==0))
{
fullgreen();
}

if((digitalRead(SignalA)==1)&&(digitalRead(SignalB)==0)&&(digitalRead(SignalC)==1))
{
fullred();
}

if((digitalRead(SignalA)==0)&&(digitalRead(SignalB)==1)&&(digitalRead(SignalC)==0))
{
fullyellow();
}

if((digitalRead(SignalA)==0)&&(digitalRead(SignalB)==1)&&(digitalRead(SignalC)==1))
{
fullblue();
}

if((digitalRead(SignalA)==1)&&(digitalRead(SignalB)==0)&&(digitalRead(SignalC)==0))
{
fullwhite();
}

if((digitalRead(SignalA)==1)&&(digitalRead(SignalB)==0)&&(digitalRead(SignalC)==1))
{
frontwhiteandbackred();
}

if((digitalRead(SignalA)==1)&&(digitalRead(SignalB)==1)&&(digitalRead(SignalC)==0))
{
yellowrightturn();
}

if((digitalRead(SignalA)==1)&&(digitalRead(SignalB)==1)&&(digitalRead(SignalC)==1))
{
yellowleftturn();
}
}
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

void fullgreen()
{
for (int i = 0; i < 120; i++)/////////////FullGreen////////
{
leds[i] = CRGB(0, 255, 0);
}
FastLED.show();
}

void fullred()
{
for (int i = 0; i < 120; i++)/////////////FullRed//////////////
{
leds[i] = CRGB(255, 0, 0);
}
FastLED.show();
}

void fullwhite()
{
for (int i = 0; i < 120; i++)/////////////FullWhite//////////
{
leds[i] = CRGB(255, 255, 255);
}
FastLED.show();
}

void fullblue()
{
for (int i = 0; i < 120; i++)/////////////FullBlue//////////
{
leds[i] = CRGB(0, 0, 255);
}
FastLED.show();
}

void fullyellow()
{
for (int i = 0; i < 120; i++)/////////////FullYellow///////////////////
{
leds[i] = CRGB(255, 255, 0);
}
FastLED.show();
delay (BlinkerSpeed2);
for (int i = 0; i < 120; i++)
{
leds[i] = CRGB(0, 0, 0);
}
FastLED.show();
delay (BlinkerSpeed2);
}

void frontwhiteandbackred()
{
for (int i = 0; i < 60; i++)/////////////White-Front//////////
{
leds[i] = CRGB(255, 255, 255);
}
for (int i = 60; i < 120; i++)/////////////Red-Back///////////
{
leds[i] = CRGB(255, 0, 0);
}
FastLED.show();
}

void yellowleftturn()
{
for (int i = 0; i < 40; i++)/////////////White-Front//////////////
{
leds[i] = CRGB(255, 255, 255);
}
for (int i = 80; i < 120; i++)/////////////Red-Back///////////////
{
leds[i] = CRGB(255, 0, 0);
}
for (int j = 40; j< 60; j++)////////////YellowLeftturn///////////
{
leds[j] = CRGB(255, 255, 0);
leds[(NUM_LEDS/2-1)+((NUM_LEDS/2)-j)] = CRGB(255, 255, 0);
FastLED.show();
delay (BlinkerSpeed1);
}
for (int j = 40; j< 60; j++)
{
leds[j] = CRGB(0, 0, 0);
leds[(NUM_LEDS/2-1)+((NUM_LEDS/2)-j)] = CRGB(0, 0, 0);
delay (BlinkerSpeed1);
}
}

void yellowrightturn()
{
for (int i = 20; i < 60; i++)/////////////White-Front///////////////////
{
leds[i] = CRGB(255, 255, 255);
}
for (int i = 60; i < 100; i++)/////////////Red-Back///////////////////
{
leds[i] = CRGB(255, 0, 0);
}
FastLED.show();
for (int j = 19; j >= 0; j--)////////////YellowRightturn///////////
{
leds[j] = CRGB(255, 255, 0);
leds[(NUM_LEDS/2-1)+((NUM_LEDS/2)-j)] = CRGB(255, 255, 0);
FastLED.show();
delay (BlinkerSpeed1);
}
for (int j = 19; j >= 0; j--)
{
leds[j] = CRGB(0, 0, 0);
leds[(NUM_LEDS/2-1)+((NUM_LEDS/2)-j)] = CRGB(0, 0, 0);
delay (BlinkerSpeed1);
}
}

[UKHeliBob]

Welcome to the forum

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What actually happens when you run your code ?
Have you got pullup or pulldown resistors in place to keep the inputs in a known state at all times ? I suspect not

[Koepel]

Welcome to the forum.

Could you read this: How to get the best out of this forum
If you show your sketch, put it between code tags. Use the '</>' button or put the sketch between lines with three single backslash quotes:

```
Your sketch
```

Can you explain the problem ?
The sketch is doing something: a-very-long-title.ino - Wokwi Arduino and ESP32 Simulator

You don't have to: #include "Arduino.h"
That is already automatically included.

A variable for a pin number, can have "Pin" in its name. It prevents confusion. For example: switchPinA

The FastLED library takes care of the pin for the ledstrip, you don't have to set it as output with pinMode().

A digitalRead() returns HIGH or LOW, not 0 or 1. For example: if (digitalRead(SignalA) == LOW && ...

You could read the switches just once and put that in variables.

void loop() {
  int valueA = digitalRead(SignalA);
  int valueB = digitalRead(SignalB);
  int valueC = digitalRead(SignalC);

  if (valueA == LOW && valueB == LOW && valueC == LOW)
  {
    fullgreen();
  }
  ...

The sketch can be improved when you separate reading the buttons from writing to the leds. Then you need a extra global variable 'state' which tells the sketch what to send to the ledstrip and the buttons can set an other state.