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// Projeto 4 – Semáforo interativo
int carRed = 12; // estabelece o semáforo para carros
int carYellow = 11;
int carGreen = 10;
int pedRed = 9; // estabelece o semáforo para pedestres
int pedGreen = 8;
int button = 2; // pino do botão
int crossTime = 5000; // tempo para que os pedestres atravessem
unsigned long changeTime; // tempo desde que o botão foi pressionado
void setup() {
pinMode(carRed, OUTPUT);
pinMode(carYellow, OUTPUT);
pinMode(carGreen, OUTPUT);
pinMode(pedRed, OUTPUT);
pinMode(pedGreen, OUTPUT);
pinMode(button, INPUT); // botão no pino 2
// acende a luz verde
digitalWrite(carGreen, HIGH);
digitalWrite(pedRed, HIGH);
}
void loop() {
int state = digitalRead(button);
/* verifica se o botão foi pressionado e se transcorreram 5 segundos desde a última vez que
 isso ocorreu */
if (state == HIGH && (millis() - changeTime) > 5000) {
 
// Chama a função para alterar as luzes
changeLights();
}
}
void changeLights() {
digitalWrite(carGreen, LOW); // apaga o verde
digitalWrite(carYellow, HIGH); // acende o amarelo
delay(2000); // espera 2 segundos
digitalWrite(carYellow, LOW); // apaga o amarelo
digitalWrite(carRed, HIGH); // acende o vermelho
delay(1000); // espera 1 segundo, por segurança
digitalWrite(pedRed, LOW); // apaga o vermelho dos pedestres
digitalWrite(pedGreen, HIGH); // acende o verde dos pedestres
delay(crossTime); // espera por um intervalo de tempo predefinido
// pisca o verde dos pedestres
for (int x=0; x<10; x++) {
digitalWrite(pedGreen, HIGH);
delay(250);
digitalWrite(pedGreen, LOW);
delay(250);
}
// acende o vermelho dos pedestres
digitalWrite(pedRed, HIGH);
delay(500);
digitalWrite(carYellow, HIGH); // acende o amarelo
digitalWrite(carRed, LOW); // apaga o vermelho
delay(1000);
digitalWrite(carGreen, HIGH); // acende o verde
digitalWrite(carYellow, LOW); // apaga o amarelo
// registra o tempo desde a última alteração no semáforo
changeTime = millis();
// depois retorna para o loop principal do programa
}
 

prog.c: In function ‘setup’:
prog.c:11:1: warning: implicit declaration of function ‘pinMode’ [-Wimplicit-function-declaration]
 pinMode(carRed, OUTPUT);
 ^~~~~~~
prog.c:11:17: error: ‘OUTPUT’ undeclared (first use in this function)
 pinMode(carRed, OUTPUT);
                 ^~~~~~
prog.c:11:17: note: each undeclared identifier is reported only once for each function it appears in
prog.c:16:17: error: ‘INPUT’ undeclared (first use in this function)
 pinMode(button, INPUT); // botão no pino 2
                 ^~~~~
prog.c:18:1: warning: implicit declaration of function ‘digitalWrite’ [-Wimplicit-function-declaration]
 digitalWrite(carGreen, HIGH);
 ^~~~~~~~~~~~
prog.c:18:24: error: ‘HIGH’ undeclared (first use in this function)
 digitalWrite(carGreen, HIGH);
                        ^~~~
prog.c: In function ‘loop’:
prog.c:22:13: warning: implicit declaration of function ‘digitalRead’ [-Wimplicit-function-declaration]
 int state = digitalRead(button);
             ^~~~~~~~~~~
prog.c:25:14: error: ‘HIGH’ undeclared (first use in this function)
 if (state == HIGH && (millis() - changeTime) > 5000) {
              ^~~~
prog.c:25:23: warning: implicit declaration of function ‘millis’ [-Wimplicit-function-declaration]
 if (state == HIGH && (millis() - changeTime) > 5000) {
                       ^~~~~~
prog.c:28:1: warning: implicit declaration of function ‘changeLights’ [-Wimplicit-function-declaration]
 changeLights();
 ^~~~~~~~~~~~
prog.c: At top level:
prog.c:31:6: warning: conflicting types for ‘changeLights’
 void changeLights() {
      ^~~~~~~~~~~~
prog.c:28:1: note: previous implicit declaration of ‘changeLights’ was here
 changeLights();
 ^~~~~~~~~~~~
prog.c: In function ‘changeLights’:
prog.c:32:24: error: ‘LOW’ undeclared (first use in this function)
 digitalWrite(carGreen, LOW); // apaga o verde
                        ^~~
prog.c:33:25: error: ‘HIGH’ undeclared (first use in this function)
 digitalWrite(carYellow, HIGH); // acende o amarelo
                         ^~~~
prog.c:34:1: warning: implicit declaration of function ‘delay’ [-Wimplicit-function-declaration]
 delay(2000); // espera 2 segundos
 ^~~~~

Standard output is empty