How was that connected??

Let us look at our hardware connection:

You can see a resistor there right? Yea. The resistor helps to reduce the amount of voltage entering the LEDs. You can do yours without a resistor; but know that the LED is at risk of getting blown/burnt out.    

Congrats. You just started as an Arduino programmer/user.

We shall in our next tutorial, see how each of the connections done above work.

Hello, LEDs

Hi there. Welcome to another tutorial on Arduino. So let us get to work.

Open your IDE (if you did download one)

Then paste the following codes:

//Tutorial on arduino

//Written by Dekatron

//25-06-2016 17:10:01

//FEEL free to tweak anyhow you need to.

int Led1  = 5; //these are the pin numbers we assign to the LEDs

int Led2 = 6; //it means we want our LEDs to have pin numbers 5,6,7 respectively

int Led3 = 7;

void setup() {

  // put your setup code here, to run once:

pinMode (Led1, OUTPUT); //This part of the code would run just once.

pinMode (Led2, OUTPUT); //We used OUTPUT to set the mode of our arduino because we want the pin to apply the voltage

pinMode (Led3, OUTPUT);

}

void loop() {

  // put your main code here, to run repeatedly:

   //This part of the code runs continuously

  

digitalWrite (Led1, HIGH); // we use this line of code to switch on our LEDs

digitalWrite (Led2, HIGH);

digitalWrite (Led3, HIGH);

delay (1000); //this line will let the above code happen for 1 second. 1000 MEANS 1 SECOND

digitalWrite (Led1, LOW); //we used this to shut off the LED1 and so on till LED3

delay (1000);

digitalWrite (Led2, LOW);

delay (1000);

digitalWrite (Led3, LOW);

}

I guess that is done now… so, let us get to the hardware wiring:

            Remember that we said that in our code, we said that the LED1= 5, LED2 = 6, LED3=7. Good. I hope you kept that in mind because I want you to go back to the Arduino picture about….

            Okay,so…you saw that from the above, some ‘holes’ were named with numbers. Okay, you saw the part where you have ‘0 1 2 3 4 ….’ Like that. The gist is that we want to connect our LEDs according to the way we programmed it. You asked what happens if we do not wire it the way the program says? Well, your computer wouldn’t get blown or your Breadboard won’t explodes (actually, you use a 9V battery –max. It’s relatively harmless because it is low voltage and it’s DC). What would happen would be that the LEDs will not light up, and the project would all be nothing. Okay, follow me.

            So there, you saw some erhmm…. Numbers. Some had some symbol next to them, some have inscriptions like Rx Tx (Transmitter Reciever respectively). Now, we attach the positive leg of our LED to the hole labeled ‘2’, ditto for other LEDs.

Here:  

Our code has been compiled