Codigo parcial

Punto 4int led_Amarillo = 13;
int led_Azul = 12;
int led_Rojo = 8;
int led_Verde = 2;
const int BOTON = 7; 
int val = 0; 
int state = 0; 
int old_val = 0; 

void setup() {
  
pinMode(led_Amarillo, OUTPUT);
pinMode(led_Azul, OUTPUT);
pinMode(led_Rojo, OUTPUT);
pinMode(led_Verde, OUTPUT);
}

void loop(){
val= digitalRead(BOTON); 
  
if ((val == HIGH) && (old_val == LOW)){
state=1-state;
delay(10);
}
old_val = val; 
if (state==1){
digitalWrite(led_Amarillo,HIGH); // encender Amarillo verde
delay(2000); // mantener por 2 segundos
digitalWrite(led_Amarillo,LOW); // apagar LED Amarillo
digitalWrite(led_Azul,HIGH); // encender LED Azul
delay(2000); // mantener por 2 segundos
digitalWrite(led_Azul,LOW); // apagar LED Azul
digitalWrite(led_Rojo,HIGH); // encender LED rojo
delay(2000);  // mantener por 2 segundos
digitalWrite(led_Rojo,LOW); // apagar LED  rojo
digitalWrite(led_Verde,HIGH); // encender LED Verde
delay(2000); // mantener por 2 segundos
digitalWrite(led_Verde,LOW); // apagar LED Verde
}
}
Punto 5
const int buttonPin = 2;     
const int ledPin =  13;       
int time=0;
int dato =0;
int buttonState = 0;         

void setup() {
 // initialize the LED pin as an output:
 pinMode(ledPin, OUTPUT);      
 // initialize the pushbutton pin as an input:
 pinMode(buttonPin, INPUT);  
Serial.begin(9600);  
}

void loop(){
 // read the state of the pushbutton value:
 buttonState = digitalRead(buttonPin);
 SerialReceive();
 if ( (buttonState == HIGH) || ( dato == 1 )) {  
        time = millis(); //  1000miilis is un second  
   if(time <= 30000){  // mientras 30 second
        // turn LED on:    
   digitalWrite(ledPin, HIGH);
   
   }
 else {
   // turn LED off:
   digitalWrite(ledPin, LOW);
  buttonState ==  LOW ;
  time= 0;
 }
}
else if ( (((buttonState == LOW) && ( time <= 30000) ))  ||  ( (dato == 0 ) && ( time <= 30000)) )
     {  digitalWrite(ledPin, LOW);
         buttonState ==  LOW ;
         time =0;
     }
}
void SerialReceive()
{
 while(Serial.available())
 { 
 dato = Serial.read();
 }