Introduction: Another Arduino Taffic Light

Picture of Another Arduino Taffic Light
       After working with the arduino and not knowing what the heck I'm doing I made Another simple traffic light. I looked around the web to find one that looks about normal and came across none. They seemed too fast. So, I found and modded some code to make this work. The coding is pretty simple.

Step 1: The Parts

Picture of The Parts

1 - Arduino (Obvious)
1 - Breadboard
6 - 270 ohm resistors
2 - Red LED
2 - Yellow LED
2 - Green LED
Misc. - Wires and Patients.

Step 2: Wiring

Picture of Wiring

I used Pins 2 - 7 to make things easy. I don't know if it hurts the Arduino to use both PWM and standard pins or not but, It works.
I wired up the grounds to the ground rail through the 270 OHM Resistors, it seems backwards to me, because I'm and electrician, to go to ground through a resistor but, I have seen this alot.

I took the 6 LED's Anode lead and wired......

Side 1                                  Side 2
1 - Red to Pin 2                  2 - Red to 5
1 - Yellow to 3                    2 - Yellow to 6
1 - Green to 4                    2 - Green to 7                 

Step 3: The Code

I hope I didn't miss anything but if I did just comment.
The code I use seems simple, But I got confused so I had to get some help on figuring out what did what to who and how many.

There are some commented out sections that could come into play later.

void setup(){
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);

void loop(){
  digitalWrite(2, HIGH); //Side 1 Red        ON
  digitalWrite(7, HIGH);  //Side 2 Green      ON
  digitalWrite(7, LOW);  //Side 2 GREEN      OFF   
  // delay(2000);
  digitalWrite(6, HIGH);  //Side 2 Yellow    ON
  digitalWrite(6, LOW);  //Side 2 Yellow     OFF
// delay(2000);
  digitalWrite(5, HIGH);  //Side 2 Red      ON
  digitalWrite(2, LOW);  //Side 1 Red      OFF
  // delay(2000);
  digitalWrite(4, HIGH); //Side 1 Green     ON
  digitalWrite(4, LOW);  //Side 1 Green    OFF
  // delay(1000);
  digitalWrite(3, HIGH); //Side 1 Yellow   ON
  digitalWrite(3, LOW);  //Side 1 Yellow    OFF
  // delay(1000);
  digitalWrite(5, LOW);  //Side 2 Red    OFF
   // digitalWrite(2,LOW);  //Side 1 Red
// delay(1000);


RichenaldA (author)2017-04-09

Thank You so much

dhaggy1980 (author)2012-03-03

I'm going to work on another that has the pedestrian switch, one side will stop traffic and the other side will let traffic go. Sounds neat anyway.

Higgs Boson (author)2012-03-02

On the video you said this is your first time using C++, but I didn't think it was possible to program the arduino using that language.

dhaggy1980 (author)Higgs Boson2012-03-03

I said that because I thought it was c++. I'm used to vb. Could you help me in correcting my statement? What language is it?

Higgs Boson (author)dhaggy19802012-03-03

Good instructable by the way.

dhaggy1980 (author)Higgs Boson2012-03-03

Thank you HIggs. It is my first Instructable.

Higgs Boson (author)dhaggy19802012-03-03

Not really sure. I know it is some variation of c++, but obviously not exactly the same thing. it is simplified and some commands are changed. Over all though it is very similar to c/c++.

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