Arduino LED Blink : Arduino 5th Lesson of Arduino Tutorial

In previous 4 lessons, you got basic idea about what is Arduino, and how to control Arduino IDE. This is the first post we are going to teach you how to create something using Arduino. First you need to have an Arduino board and Arduino IDE with you. Also, the cable that gives ability to connect PC and Arduino board. Here is the list what you need.

• x1 LED
• x1 220ohm Resistor
• x1 Arduino Board
• x1 Suitable Cable for Arduino Board
• x3 Male to Male Jumper Wires
• x1 Project board

Don’t you know how project board works? Go and see the inside of project board by clicking below button.

Here is the circuit diagram. You have to make the circuit according to this image.

So, this LED is for output and we are using 220ohm resistor for decreasing current that comes to Arduino board. 220ohm resistor makes Arduino board more secure. Without resistor is also ok. But not safe one. Breadboard is for connecting all parts together. I used 5^th pin of Arduino to use LED. You can use another pin. 

Now let’s have a look about the code.

You have to put code like this for making the LED on.

We initialized 5^th pin as an output in this Void Setup. We are putting ‘pinMode’ for initialize a pin. So, ‘digitalWrite’ makes the output. ‘HIGH’ in the ‘digitalWrite’ function is make digital high output. In simple words it makes current on in that pin. ‘LOW’ in the ‘digitalWrite’ function is make digital low output. In simple words it makes current off in that pin. Remember to put correct spellings in the correct positions, because otherwise your code will not work properly. Now we have test Arduino LED Blink project.

You have to put initializing in the Void Setup as I mentioned above. Then you can add high function and make a delay. Delay is always coming with milliseconds. So, you can put 1000 milliseconds and get 1 second delay. After putting delay, you need to put digitalWrite low function. It will off the light. Then put 1000 millisecond delay again and make the code complete. Then your Arduino blink project is ok. If you don’t have a LED or resistor, don’t worry. Arduino’s 13 pin always connected with Arduino inbuilt light. So, you can put 13th pin instead of 5th pin mentioned in those codes.

This is an advanced type of Arduino LED blink. If you like to learn more about Arduino, here you can learn. If you want learn only basics, you can skip this.

We are putting the pin as a variable. So, it will make larger codes easier. If you type 5^th pin, 5^th pin always at the code. There is a possibility to forgot the use of 5^th pin. If you make variable in the beginning of the code as 5^th pin is defined as LED, you only have to type ‘LED, HIGH’ in the code. Now you can understand the value of this technique.

This is much more advanced part in Arduino LED blink. You can add number value instead of HIGH function in Arduino. In number values, you can control the brightness of the LED. Maximum number you can use for digitalWrite is 255 and lowest one is 0. You can understand much more using below code.