Arduino/C3/AVR-GCC-programming-through-Arduino/English-timed

Time	Narration
00:01	Welcome to the Spoken Tutorial on AVR-GCC programming through Arduino.
00:08	In this tutorial, we will learn to: interface a seven segment display to Arduino board,
00:15	write an AVR-GCC program to display a digit on seven segment display and display digits 0 to 9 on the seven segment display.
00:27	To follow this tutorial, you should have basic knowledge of :
00:31	electronics,
00:34	C Programming and AVR-GCC.
00:39	To record this tutorial, I am using: Arduino UNO Board and Ubuntu Linux operating system version 14.04.
00:50	GCC stands for GNU Compiler Collection.
00:54	It is a compiler which supports various programming languages.
00:59	AVR-GCC is a part of GCC and supports compiling C programs for AVR microcontrollers.
01:08	Since Arduino uses ATMEGA328P, this is a suitable compiler.
01:15	We also require some external devices such as: Seven-Segment Display,
01:22	220 ohm Resistor,
01:26	Breadboard,
01:28	Arduino UNO Board and Jumper Wires.
01:33	In this experiment, we will be using the common anode seven-segment display.
01:39	Please refer to the basic level tutorials of this series to know more about Seven segment display.
01:46	Refer the pin mapping for Arduino and microcontroller.
01:51	Do the circuit connection as shown here.
01:55	The Dot pin of the Seven Segment Display is connected to the pin 13 of the Arduino.
02:02	Any one of the common pins is connected to the +5 Volts through a resistor.
02:09	This is the live setup of the connection.
02:12	Now, we will write an AVR-GCC program to blink the Dot LED on the seven segment display.
02:22	We need to install AVR-GCC assembler and an AVR-LIBC library.
02:29	AVR-GCC will generate a hex file and upload it to Arduino board.
02:35	AVR-LIBC contains the required library files that can be used in the program.
02:42	Open the terminal by pressing Ctrl + Alt + T keys together.
02:48	Type: sudo space apt hyphen get space install space avr hyphen libc space gcc hyphen avr and press Enter.
03:03	Enter the administrative password if prompted and press Enter.
03:09	We can see the installation process has begun.
03:13	Press 'Y' wherever there is a prompt during installation to confirm the configuration.
03:20	Installation will take some time to complete depending upon the internet speed.
03:26	We can see that the installation has been completed successfully. Let me clear the terminal.
03:34	Now, let us connect the Arduino board to the computer.
03:38	To check the port number of Arduino, I will type: ls space forward slash dev forward slash ttyACM asterisk and press Enter.
03:51	We can see the output as shown. Here ttyACM0 represents the port number of Arduino.
04:00	You may get a different port number. Make a note of your port number.
04:06	Download the file Makefile from the Code files link of this tutorial.
04:12	Makefile enables us to create a dot hex file and upload it to Arduino.
04:19	Save the Makefile in the folder where you will be saving the C program.
04:24	Let us write the avr-gcc program to blink the Dot LED and upload it to the microcontroller.
04:32	Open any text editor and type the following.
04:36	We have to include the libraries required for our program.
04:41	avr slash io dot h contains all the basic libraries required to perform the input and output operations.
04:50	util slash delay dot h contains the libraries for the delay function.
04:56	Arduino board has an LED at PB5.
05:00	Set PB5, that is pin 13 of Arduino as output.
05:05	Sending 0 to PB5 turns on the LED.
05:09	Sending 1 to PB5 turns off the LED.
05:13	These two steps will run in an infinite while loop making the LED blink.
05:19	Source code that are used in this tutorial are available in the Code Files link of this tutorial. You can download and use it.
05:28	I’ll save the code as dot hyphen blink dot c in the Downloads folder.
05:37	Switch to the terminal.
05:39	Go to the Downloads folder where dot hyphen blink dot c file is saved.
05:45	Type: make space FNAME in capital equals dot hyphen blink and press Enter. This command creates a dot hex file and uploads it to the Arduino.
06:00	Now, you can see that the Dot LED in the seven segment is blinking.
06:06	Next, we will display digit 2 on the seven segment display.
06:11	To display '2', a, b, d, e, g segments should be high and the other LEDS should be low.
06:19	Pins a, b, c, d, e, f and g of the seven segment display are connected to the pins 2, 3, 4, 5, 6, 7 and 8 of the Arduino respectively.
06:32	The common pin is connected to +5 Volts through resistor.
06:37	Let us see the live connection setup.
06:42	Let us see the source code for this program.
06:46	Open any text editor and type the following code.
06:50	The first two lines of the code in the 'main' function set pins 2 to 8 as output pins.
06:58	The codes inside the while loop are used to control the state of the respective LEDs.
07:05	Sending 0 will cause the LED to glow and sending 1 will turn it off.
07:11	Save it as two.c file.
07:15	Switch back to the terminal. Clear the terminal now.
07:21	Type: make space FNAME in capital equals two and press Enter.
07:30	Now you can see that the digit two in the seven segment is glowing.
07:38	Pause the tutorial and do the below assignment. Modify the above code to display any other digit from 0 to 9.
07:48	Next, we will display the numbers 0 to 9 on the Seven Segment Display.
07:54	Setup remains the same.
07:57	Let us see the source code for this program. Open any text editor and type the following code.
08:04	The for loop is used to count from 0 to 9. Each time, the variable 'i' is incremented by one and the value is passed to 'sevenseg' function.
08:16	The 'sevenseg' function receives an integer ranging from 0 to 9. Based on the input, the case structure is executed.
08:27	Thus displaying the digits from 0 to 9.
08:32	Save it as counter.c file.
08:36	Switch back to the terminal and clear it.
08:40	Type: make space FNAME in capital equals counter and press Enter.
08:50	Now, we can see the digits 0 to 9 are displayed in the seven segment display.
09:02	This brings us to the end of this tutorial. Let us summarize.
09:06	In this tutorial, we learnt to interface a Seven-segment display to Arduino board,
09:13	write an AVR-GCC program to display a digit on seven-segment display and
09:19	display digits 0 to 9 on the Seven segment display.
09:24	The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.
09:32	The Spoken Tutorial Project team conducts workshops and gives certificates. For more details, please write to us.
09:42	Please post your timed queries in this forum.
09:46	Spoken Tutorial project is funded by NMEICT, MHRD, Government of India. More information on this mission is available at this link.
09:56	This tutorial has been contributed by FOSSEE and Spoken Tutorial Project, IIT Bombay. This is Priya from IIT Bombay. Thanks for joining.

Contributors and Content Editors

PoojaMoolya, Sandhya.np14