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Create a semaphore with Arduino Arduino Massimo Banzi has

Wandering the Internet, I realized that there are few guides or examples in Italian about Arduino, so I wanted to help try to give some examples with explanation.

And here is a source code that allows you to enable multiple outputs, so as to create a "traffic light". Let's see how:

# include "WProgram.h"

void setup () {

pinMode ( LED_PIN, OUTPUT ) / / enable pin 10 for output

pinMode ( LED_PIN1, OUTPUT ) / / enable pin 11 for output

pinMode ( LED_PIN2, OUTPUT ) / / enable pin 12 for output

}

void loop () {

digitalWrite ( LED_PIN, HIGH ) / / red LED lights

delay ( 10000 ) / / wait 10 seconds

digitalWrite ( LED_PIN, LOW ) / / RED LED

digitalWrite ( LED_PIN2, HIGH ) / / green LED lights

delay ( 10000 ) / / wait 10 seconds

digitalWrite ( LED_PIN2, LOW ) / / the green LED

digitalWrite ( LED_PIN1, HIGH ) / / Yellow LED lights

delay ( 2000 ) / / wait 2 seconds

digitalWrite ( LED_PIN1, LOW ) / / off LED YELLOW

}

Obviously you have to respect the colors of the LEDs according to the pin, then:

RED LED PIN 10

LED YELLOW PIN 11

GREEN LED PIN 12