Difference between revisions of "Arduino/C2/First-Arduino-Program/English"

Learning objectives

• Write an Arduino program
• Compile and upload the program and
• Blink an LED

System Requirement

• Arduino UNO Board
• Ubuntu Linux 14.04 operating system
• Arduino IDE

Pre-requisites

• Basic knowledge of Electronics
• Basic knowledge of writing a C or C++ Program
• Arduino UNO Board with USB power cable

By default, it creates the name as Sketch underscore and a name.

Now click on the Save button.

void setup and void loop.

This will help us to see the execution of the program and the output in the board.

Point to the pin number 13 with the marker

It is a digital input/output pin connected to this LED internally.

Notice the highlight with the marker.

Type,

pinMode(13, output)

In our case, pin number 13 has to be set up first.

To do this, we will use an in-built function called pinMode.

It has two parameters - pin number comma mode.

So, type pinMode open brackets 13 comma output close brackets semicolon

It will glow when the voltage is high but it will not glow when the voltage is zero.

We have to configure mode as ‘output’ to serve voltage to the LED.

Type,

digitalWrite(13, HIGH)

There is a function called digitalWrite which will write to a digital pin.

This function has two parameters as pin number and value or state.

Already, we know the pin number as 13. The value should be HIGH or LOW.

So, type: digitalWrite open brackets 13 comma HIGH close brackets semicolon

We want to glow the LED. So, the voltage should be HIGH.

Highlight the compilation status

This will compile our program into binary format which is understandable by the microcontroller.

You can see the compilation status at the bottom of the IDE.

Alternately, you can select Sketch menu and then upload.

Now you can see the LED is glowing.

We have to modify this program such that the second parameter value is LOW.

That is ON and OFF, with one second interval.

Delay is a built-in function which pauses the program for certain amount of time.

I will type: delay open brackets comma 500 close brackets semicolon

Here 500 means, 500 milliseconds, that is, half a second of delay.

digitalWrite(13,LOW)

This makes the digital pin 13 to OFF mode.

delay(500);

Type: delay open brackets 500 close brackets semicolon

Again, we want to OFF it for 500 milliseconds.

The pin number 13 connected to the LED will be in HIGH state for 500 milliseconds .

And then in the LOW state for 500 milliseconds.

This program is executed repeatedly in the loop.

• How to write an Arduino program
• Compile and upload the program
• Blink an LED

• Change the delay timing to 1500 in the above Blink LED program
• Compile and upload the program
• Observe the blinking in the LED

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