Arduino/C3/AVR-GCC-programming-through-Arduino/English-timed
From Script | Spoken-Tutorial
| 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. |
