Arduino/C2/First-Arduino-Program/English-timed

Time	Narration
00:01	Welcome to the Spoken Tutorial on First Arduino Program.
00:06	In this tutorial, we will learn how to: write an Arduino program, Compile and upload the program and Blink an LED.
00:19	Here, I am using: Arduino UNO Board,
00:23	Ubuntu Linux 14.04 operating system and Arduino IDE.
00:30	To follow this tutorial, you should have: basic knowledge of Electronics,
00:36	basic knowledge of writing a C or C++ program,
00:41	and, Arduino UNO Board with USB power cable.
00:46	Let us open the Arduino IDE to write our first program.
00:52	Here, we can see various menus in the Menu bar.
00:57	In Arduino environment, each program is saved as Sketch.
01:03	By default, it creates the name as Sketch underscore and a name.
01:11	You can change the name by clicking on the File and then on Save.
01:18	Type the filename as BlinkLed. Now click on the Save button.
01:26	This is the default program environment with two empty functions -void setup and void loop.
01:35	Now, we will write an Arduino program to blink the LED.
01:41	I have placed my IDE and the Arduino board side by side.
01:47	This will help us to see the execution of the program and the output in the board.
01:54	For this LED program, I want to blink pin number 13.
02:00	It is a digital input/output pin connected to this LED internally.
02:07	Notice the highlight with the marker.
02:10	Now, we have to write our code.
02:13	void setup function stands for setting up a microcontroller.
02:18	In our case, pin number 13 has to be set up first.
02:24	To do this, we will use an in-built function called pinMode.
02:31	It has two parameters - pin number comma mode.
02:36	So, type: pinMode open brackets 13 comma output close brackets semicolon.
02:48	Why should we keep the mode as output?
02:51	This is because the pin number 13 is internally connected to the LED.
02:58	It will glow when the voltage is high but it will not glow when the voltage is zero.
03:05	We have to configure mode as ‘output’ to serve voltage to the LED.
03:12	Next we will write code to the void loop function.
03:17	Before we blink a LED, let us glow a LED.
03:22	There is a function called digitalWrite which will write to a digital pin.
03:29	This function has two parameters as pin number and value or state.
03:36	Already, we know the pin number as 13. The value should be HIGH or LOW.
03:44	So, type: digitalWrite open brackets 13 comma HIGH close brackets semicolon.
03:55	We want to glow the LED. So, the voltage should be HIGH.
04:00	That's all. The code is very simple.
04:04	Next step is to compile the program.
04:08	Click on the Tick icon on the menu bar to verify the program.
04:14	This will compile our program into binary format which is understandable by the microcontroller.
04:22	You can see the compilation status at the bottom of the IDE.
04:27	Next we need to upload the program to the microcontroller.
04:32	Click on Right arrow button on the menu bar to upload. Alternately, you can select Sketch menu and then upload.
04:48	You can see the TX RX blinks for a while. This indicates the transmission is ON.
04:57	Now you can see the LED is glowing.
05:01	How to turn off the LED? We have to modify this program such that the second parameter value is LOW.
05:11	Now, let us compile and upload this program.
05:16	You can see the LED is off now.
05:20	We know how to turn ON and OFF the LED.
05:25	Next, we will modify the program to make the LED to blink,
05:31	that is, ON and OFF, with one second interval.
05:36	We will change the program as shown. Delay is a built-in function which pauses the program for certain amount of time.
05:46	I will type: delay open brackets 500 close brackets semicolon. Here, 500 means 500 milliseconds, that is, half a second of delay.
06:01	Next, type as digitalWrite open brackets 13 comma LOW close brackets semicolon.
06:12	This makes the digital pin 13 to OFF mode.
06:17	How long we want to turn it OFF? Type: delay open brackets 500 close brackets semicolon.
06:28	Again, we want to OFF it for 500 milliseconds.
06:34	Let me explain the Void loop program line by line again.
06:40	Void loop is an infinite loop and it will execute continuously.
06:45	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.
06:57	This program is executed repeatedly in the loop.
07:02	Let us upload the program.
07:05	We can see our LED is blinking.
07:10	This brings us to the end of this tutorial. Let us summarize.
07:16	In this tutorial, we learnt about: how to write an Arduino program,
07:21	Compile and upload the program and blink an LED.
07:27	Do the following assignment. Change the delay timing to 1500 in the above Blink LED program.
07:37	Compile and upload the program and observe the blinking in the LED.
07:45	The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.
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08:35	This tutorial has been contributed by FOSSEE and Spoken Tutorial Project, IIT Bombay. Thanks for watching.

Contributors and Content Editors

PoojaMoolya, Sandhya.np14