Free and Open Source Embedded Designs

PC Interface to Six Digit Display via USB Port

2011-05-16T00:15:00.001+05:30

we have designed a digital display with USB interface to PC. This device is MODBUS compatible and data sent via USB interface from PC can display any value.

The attached photo is showing count for AMITYUNI page on facebook.

A sample program in PC picks up like counter for a facebook page is here

https://github.com/facebook/python-sdk Python + facebook SDK

http://pastebin.com/AgffVnUf - Application program as created by Anuvrat Parasher of Amity Univeristy Computer Science

http://kovshenin.com/archives/facebook-fans-count-using-python-and-the-graph-api/ - PC program was developed by using information from this link

http://pastebin.com/c1a3eN7Q Program for display of date and time with dot point is here

MODBUS specs for this device are on our facebook page and can be seen here https://www.facebook.com/gvcsystems#!/notes/gvc-systems/tech-specs-of-usb-2-display-devices/213868321973943

Arduino Based Starter Kit with LCD + IR + USB PORT + RTC + Sensors + LED DRIVERS

2011-05-16T00:04:00.000+05:30

We have designed a PCB with following features

Arduino ATMEGA 328 with boot loader for programming
Alphanumeric LCD (20 Char X 4 Lines)
Real Time Clock with battery back up
I2C based EEPROM
Infra red sesnor + Infra red remote handset with more than 21 keys
Light Sensor
Temperature sensor
USB port to connect to computer / program

We have also created test programs for quick starting up -

Lab 1 - Send "Hello World" to PC thru USB port
Lab 2 - Display "Hello World" on LCD and PC
Lab 3 - Same as Lab 2 + Display counting from 1 onward on LCD as well as PC
Lab 4 - Same as Lab 3 + counting starts from key pressed on PC Keyboard
Lab 5 - Accept Hours and Mins from PC. Display Digital Clock in Hours:Mins:Secs in 24 hour formar
Lab 6 - Read time from battery backed up RTC. Display time on LCD and PC, Time setting from PC when needed
Lab 7 - Decode key pressed on IR Remote handset based on uPD6121. Display all four codes on LCD/PC.
Lab 8 - Sequential switching on of seven leds one by one
Lab 9 - Remote controlled switch. Control of seven leds by IR Remote.

All these nine labs are here in a single zip files
http://www.box.net/shared/2bys2bz59o

PCB Design, Circuit Design and BOM are here

http://www.box.net/shared/2gs0u7uepu

Arduino based Traffic Light Dual Color Count Down Timer

2011-05-15T23:47:00.001+05:30

A construction article by Vinay Chaddha based on his commercial project of traffic light is published in May 2011 issue of Electronics For You.

This project is the advanced version of count down timers used in Delhi/Other metros.

The articles has complete software, hardware, construction details and even the programming instructions.

This is the sixth article by Vinay Chaddha. The other five are

Set Top Converter - June 1997
Caller ID for landline - Apr 1999
Remote Control Audio - Sep 1999
Access Control Systems - Oct 2002
Beverage Vending Machine - Oct 2006

We also plan to share few more designs based on same hardware but with different functions. The ones in pipeline are

Parking Counter
Gaming Timer
MODBUS controlled Display Unit

2009-12-02T00:11:00.003+05:30

Arduino Lab 2 0

View more documents from Vinay Chaddha.

2009-12-02T00:11:00.001+05:30

Arduino Lab 1 1

View more documents from Vinay Chaddha.

2009-12-02T00:10:00.001+05:30

Arduino Lab 1 0

View more documents from Vinay Chaddha.

2009-12-02T00:08:00.001+05:30

Arduino Labs

View more documents from Vinay Chaddha.

Open Source Embedded at google sites

2009-07-22T12:58:00.002+05:30

We created google site for open source embedded.

http://sites.google.com/a/gvc.in/open-embedded/home

This can be easily accessed via tinyurla or bitly also

http://tinyurl.com/open-source-embedded

http://bit.ly/open-embedded

Google Ad campaign launched on July 14,2009

2009-07-15T06:44:00.003+05:30

On July 14,2009 we launched ad camapaign for open embedded software development using google adwords. We started with a monthly ad budget of Rs 1000/- only.

We also created a google for to collect data from students and hobbyists so that they can be contacted and updated regularly. The link is

http://tinyurl.com/open-embedded

http://spreadsheets.google.com/embeddedform?key=tFdhmhTbMo1BeJL--rRR-HQ

Two new projects by GVC released

2009-06-30T22:46:00.004+05:30

GVC Systems has released two products under GNU General Public License V2.

Project 1 deals with CCTV switcher and is a commercially successful design. Details are at
http://code.google.com/p/camera-switchers/

Project 2 deals with remain time counter at a traffic signal intersection. Details are at
http://code.google.com/p/traffic-signal-timer/

License used by Arduino

2009-06-26T11:58:00.002+05:30

As we are also starting to publish open source hardware on the net, it is required to know about the license which is used by Arduino and other open source projects.
So i found the list of available open source license http://opensource.org/licenses

The famous Arduino project uses
Code license: GNU General Public License v2
Content license: Creative Commons 3.0 BY-SA

So to publish hardware content, we have adopted GNU General Public License v2

Why the Arduino Matters

2009-06-22T10:52:00.003+05:30

Why the Arduino Matters
http://www.urbanhonking.com/ideasfordozens/2009/05/why_the_arduino_matters.html

A good story about how arudino will change the world of embedded development for hobbyists and bggineers and professionals

ARDUINO ON MAC OSX

2009-06-08T09:44:00.001+05:30

1. Use BAFO USB2SERIAL Converter. Installed driver. You can check installation using a normal PC and ZTERM program for MAC. (see other mail related to MAC)

Install Arduino. Select serial port from selection. There may be two options

dev/tty/usbserial

dev/cu/usbserial

select dev/cu/usbserial. This does not look for hardware signal for handshake.

2. Arduino on MAC works in 32 bit. To open application in 32 bit, press CTRL and left click on icon and select GET INFO.

Under get info, there is a box named as "Open in 32 bit Mode" check that box.

Arduino in an hour

2009-05-26T14:27:00.002+05:30

After working on arduino for over a month, i feel like sharing the information to all about how to start the basic working on an arduino. as i have arduino severino with me, I've created document as per it. you can download the file here.

Gobetwino

2009-04-29T14:55:00.002+05:30

Gobetwino is kind of a "genreric proxy" for Arduino. It's a program running on a PC (Windows only - sorry), that will act on behalf of Arduino and do some of the things that Arduino can't do on its own. So it works like a go between, hence the name.

Gobetwino is free, comes with a detailed user manual, and sample Arduino sketches to show how it can be used.

Gobetwino can bedownloaded here. Check this blog for information about updates, user suggestionns, and bugs.

What Is Bootloader?

2009-04-23T14:23:00.002+05:30

A Boot Loader program is placed inside
the Boot Section of the Flash memory.
This program handles communication
with the host PC, and facilitates programming
of both Flash and EEPROM.
Once programmed, different levels of protection
can be individually applied to both
the boot and application portion of the
Flash memory.

Read the complete article at:
http://embsys.technikum-wien.at/staff/veigl/MDBA/Projects/Bootloader_HowTo.pdf

Burning Bootloader in ATmega8 with STK500

2009-04-23T12:57:00.004+05:30

earilier i mentioned a post regarding how to burn bootloader in ATmega168 using STK500.
bit to burn bootloader in ATmega8, there was some problems as the fuses, memory and lock bits of ATmega8 are different than ATmega168.
so i created a new batch file, and followed the same procedure like ATmega168, to burn bootloader in ATmega8.

the commands of batch file are given below:

: We're assuming a few things:
: 1) Your firmware is at C:\arduino-0009\bootloader8, and it is the ATmegaBOOT.hex
: 2) Your STK software is at C:\Program Files\Atmel\AVR Tools\STK500\Stk500.exe
: 3) You're trying to program a ATmega168 using the high-voltage mode of the STK-500
:If they're not, make the edits below!

:Change to firmware directory
cd C:\arduino-0009\bootloader8

: Set fuse bits, lock bits, voltages
"C:\Program Files\Atmel\AVR Tools\STK500\Stk500.exe" -dATmega8 -ut5.2 -e -ua5.0 -!3686400 -lFF -LFF -fCAFF -ECA -mp -q

: Burn Arduino hex bootloader file
"C:\Program Files\Atmel\AVR Tools\STK500\Stk500.exe" -dATmega8 -pf -vf -ifATmegaBOOT.hex -mp -q

: Lock it down
"C:\Program Files\Atmel\AVR Tools\STK500\Stk500.exe" -dATmega8 -lFF -LFF -mp -q

@echo CHECK FOR PROBLEMS ABOVE before closing this window!
pause

A bootloader for the ATmega8 AVR microprocessor

2009-04-23T11:44:00.003+05:30

What is a bootloader?
What is it good for?
What is the main benefit of a boot loader?
Who does need a bootloader?
What was the motivation for creating the bootloader that is published here?
What is the history behind this piece of software?
What do I have to know about he hardware configuration?

All this and many more answers about bootloader can be found at
http://www.dl5neg.de/bootloader/bootloader.html

PIC TO LCD INTERFACE

2009-04-18T17:38:00.003+05:30

DESCRIPTION:
This article here is about how to interface PIC with LCD. Here in this project I am using PIC 16F84A and HD44780 compatible LCD. Though any character and line LCD can be used as long as it has HD44780 based controller, I used 16x2 line LCD. LCD can be interfaced both in 8 bit and 4 bit mode. I am using 4 bit interface mode so Port A and bit 0 of port B of PIC are free for any use.

DOWNLOAD FILE:
lcd4.asm
lcd4.hex
http://patna.sancharnet.in/guria741/pic2lcd/pic2lcd.htm

LOCK PROJECT WITH KEYPAD AND LCD USING PIC

2009-04-18T16:43:00.003+05:30

DESCRIPTION:
It is a simple combination lock with lcd and keypad both the harwares are interfaced with PIC micocontroller it is an eight bit controller.This project is written in C language. The basic user lock is of 2 Digits.The input is taken from a 4x3 Keypad (please see the schematic for more information) and Display the user input on a 2x16 LCD. A pin is assigned as output for activating and deactivating the lock. For demonstration I have connected an LED to that pin.
How combination lock works:
1. Turn switch on (5V DC voltage power supply)
2. A message name “Combination Lock” will display on LCD at first row,
3. Second row display “Enter Pass:” it asked you to enter password for open doors.
4. In this lock design it has three doors. These are the code locks to open doors “door1=05, door2=28, door3=82, door1 & door2 = 33”.
5. If you entered one of the codes in step 4 then press enter key that door will open. For example, you enter 05 for door 1 it’s then open and close door 1 after 5 seconds.
6. If codes you entered are not matched one of the code in step 4 then led door is not turn on.
7. If your first attempt failed the message “invalid code’ display on screen.
8. Then you pressed any key to clear and you can try for second attempt.After you have reached three attempts but you have not entered correct password. Next Any Keys press alarm will activate for 5 seconds.Using the Keypad:Keypad has 12 keys (4x3) starting from 1,2,3,4,5,6,7,8,9,*,0,# (please see the schematic for layout). Numeric keys are used for entering numbers. '*' is used as the Cancel key and '#' is used as the Enter key.

Download File Information:
Flowchart.jpg
Combination_lock.c
Diagram bitmap.bmp
Lock_EBES_MODEL.DSN ( Using Proteus to run this file)
Combination_Lock.hex
All the above files downloaded by this link
http://www.8051projects.net/downloads195.html

ELECTRONIC VOTING MACHINE

2009-04-18T15:17:00.002+05:30

DESCRIPTION:
Electronic voting machine (EVM) is capable of saving considerable printing stationery and transport of large volumes of electoral material. It is easy to transport, store, and maintain. It completely rules out the chance of invalid votes. Its use results in reduction of polling time, resulting in fewer problems in electoral preparations, law and order, candidates' expenditure, etc. and easy and accurate counting without any mischief at the counting centre. It is also eco friendly.Our EVM consists mainly of two units - (a) Control Unit (CU) and (b) Ballot Unit (BU) with cable for connecting it with Control unit. Both the units consists of one microcontroller (8052) each. The CU consists of one LCD, one hex keypad and a couple of switches, while BU consists of a candidate panel, a votecast panel and a buzzer, etc. This project is based on assembly language programming. The software platform used in this project are Keil uVision3.

FILE INFO:
CIRCUIT:
8051_board.jpg : PCB layout diagram.
Ballot.jpg: Schematic diagram for ballot unit.
Controlunit.jpg : Schematic diagram for control unit.
CODING:
finalbu.a51: Assembly code for ballot unit.
nointerrupt.hex: Hex code for ballot unit.
voting.a51: Assembly code for control unit.
voting.hex: Hex code for control unit.
http://www.8051projects.net/downloads205.html

After you finish making the hardware. You have to do the following things:
1. Load cufirst.hex file in your controller.
2. Run your circuit.
3. Wait for 2-3 seconds.
4. Load voting.hex which is the real control unit program.5. Run it.

AUTOMATIC ROOM LIGHT CONTROLLER WITH VISITOR COUNTER USING MICROCONTROLLER

2009-04-18T15:04:00.002+05:30

DESCRIPTION:
This Project “Automatic Room Light Controller with Visitor Counter using Microcontroller” is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/ visitors in the room very accurately. When somebody enters into the room then the counter is incremented by one and the light in the room will be switched ON and when any one leaves the room then the counter is decremented by one. The light will be only switched OFF until all the persons in the room go out. The total number of persons inside the room is also displayed on the seven segment displays.The microcontroller does the above job. It receives the signals from the sensors, and this signal is operated under the control of software which is stored in ROM. Microcontroller AT89c2051 continuously monitor the LDR’s 1 & 2 (Light Dependent Resistor), When any object pass through the LDR’s then the light falling on the LDR’s are obstructed , this obstruction is sensed by the Microcontroller.

FILE INFO:
Room.gif: circuit diagram
Room1.gif : circuit diagram
Light.a51: Assembly code.

PICTURE OF DIGITAL CLOCK

2009-04-18T14:56:00.002+05:30

Day, date , month , year , hour , minute and second on the LCD.

DIGITAL CLOCK USING RTC

2009-04-18T14:14:00.004+05:30

DESCRIPTION:

With the help of this project we can display the time ,month , year and day. we can also set the alarm,time increment or decrement the value. These all things are controlled by 8-bit microcontroller AT89C51 and RTC,for dispaly we will use the 1x16 LCD and for the alarm a buzzer we will use in our project . All the used components are easily available.

FILE INFO:

clock.hex : Direct hex file load and run.

lcd.c and lcd.h : lcd routine and header file.

rtc.c and rtc.h : routine and header file.

project.c and portc.h: routine and header file.

http://www.8051projects.net/downloads20.html

we can download above described all the files from this link.

DIGITAL VOLTMETER

2009-04-18T13:00:00.003+05:30

DESCRIPTION:

This is a Digital voltmeter project mainly focusing on designing condition circuits and demonstrating a use of Analog to Digital Converter (ADC).Voltage range is 0v to 15v. Sustem controlled with the help of 8-bit microcontroller AT89C51,and the voltage will be dispalyed on LCD.All the components are easily available.

File Info:

Voltmeter.hex: Direct hex file load and run

LCD.c LCD.h: LCD Routines and header file

Voltmeter.c: Main C file and ADC Routines

Volt.txt: Explanation of conditioning circuit

http://www.8051projects.net/downloads214.html

All the above mentioned file downloaded from this link .

Enjoy