Changing RGB led display using a hall effect sensor

int day = 0; // store the number of day since the user refills the kit
int count = 0; // store the times user opens the kit each day
int output = 0; // store the output status of magnet sensor
int pre_status = 0; // store the previous status
const int onSwitch = 2; // Define the pin for the magnet sensor 

// Define the pins for RGB LED
const int RED_PIN = 8;
const int GREEN_PIN = 9;
const int BLUE_PIN = 10;


void setup() {
  pinMode(onSwitch, INPUT);
  Serial.begin(9600);
}


void loop() {
  // Get the recorded time and format it into day, hour, minute and second
  long int current_time = millis()/1000;
  int current_day = current_time/(24*3600);
  int hour = (current_time/3600)%24;
  int minute = (current_time/60)%60;
  int second = current_time%60;

  // Print the time to the Serial Monitor
  Serial.print("Day:");Serial.print(current_day);
  Serial.print("  Time:");Serial.print(hour);
  Serial.print(":");Serial.print(minute);
  Serial.print(":");Serial.print(second);
  delay(1000);

  // Reset when the next time period (day here) comes
  if (current_day != day){
    day = current_day;
    count = 0;
  }

  // Change the LED display according to the output and the count

  // Read the output of the hall effect sensor
  int sensorVal = digitalRead(onSwitch);

  // Define two output status based on the sensor output
  if (sensorVal == HIGH){
    output = 0; // box close
  }
  else{
    output = 1; // box opened
  }
  
  // Use "if/else statement" to define 4 action status, as shown in table
  if (count <= 1){
    if (output == 0) {
      if(count == 0){
        showRGB(0);
        pre_status = 0;
        Serial.println("   User has not injected yet");
      }
      else{
        showRGB(2);
        pre_status = 2;
        Serial.print("   User has injected ");
        Serial.print(count);
        Serial.println(" time(s) today");
      }
    } 
    else{
      showRGB(1);
      Serial.println("   User opens the box");
      if (pre_status != 1){
        pre_status = 1;
        count = count + 1;
      }
    }
 }
 // When the count is greater than 1, which means the user probabaliy overdose,
 // the LED blinks to warn.
 else{
   digitalWrite(RED_PIN, HIGH);
   digitalWrite(GREEN_PIN, LOW);
   digitalWrite(BLUE_PIN, LOW);
   delay(300);
   digitalWrite(RED_PIN, LOW);
   delay(200);
   Serial.println("   Overdose");
  }
}


void showRGB(int LED_status)
{
  int redIntensity;
  int greenIntensity;
  int blueIntensity;

  // "if/else statement" is used here to define 4 display status.
  if (LED_status == 0)
  {
    // In status 0, the LED displays green light.
    redIntensity = 0;
    greenIntensity = 255;
    blueIntensity = 0;
  }
  else if (LED_status == 1)
  {
    // In status 1, the LED displays yellow light.
    redIntensity = 200;
    greenIntensity = 130;
    blueIntensity = 0;
  }
  else if (LED_status == 2)
  {
    // In status 2, the LED displays red light.
    redIntensity = 255;
    greenIntensity = 0;
    blueIntensity = 0;
  }

  // analogWrite() is used to set the brightness values of each LED and the
  // LED could generate different lights.
  analogWrite(RED_PIN, redIntensity);
  analogWrite(GREEN_PIN, greenIntensity);
  analogWrite(BLUE_PIN, blueIntensity);
}