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Archive for November, 2008

Real Time Clock using CAT89C4051

Real Time Clock using CAT89C4051 Wednesday, November 19th, 2008  »  Posted By Ranjith  »  Total 9 Comments

Hello friends, here is a clock project where CAT89C4051 is used as RTC. LCD is used for display. Using CGRAM area of LCD you cn create cistome characters. Here you will be able to see big and better digits in LCD. The digits are twice the size of the normal digits. PCB design for project [...]

Digital Code lock using AT89C2051

Digital Code lock using AT89C2051 Tuesday, November 18th, 2008  »  Posted By Ranjith  »  Total 23 Comments

Here is a project called ‘Digital Code Lock using AT89C2051′. LCD is used for display and a keyboard is used to input  the keys. This project source code is written in C. Both the C files and hex files are given for download. A Brief Description: This a simple project with efficient hacking prevention from [...]

Control your PC with TV Remote

1 Tuesday, November 18th, 2008  »  Posted By Ranjith  »  Total 23 Comments

Now you can control your mouse cursor and windows media player with your TV remote… So when you are watching a movie or listening songs on your PC, you need not to get up from your seat to change the volume or to change the track.. you can simply use your TV remote to do [...]

Stepper motor control board

1 Monday, November 17th, 2008  »  Posted By Ranjith  »  Total 28 Comments

This project is actually an educational kit. One can study the full operation of unipolar type stepper motor using this board. As it is micro controller based it can be programmable also and one can learn micro controller interfacing with LEDs, key board and stepper motor. Thus single board serves the purpose of learning stepper [...]

Automated multistoried car parking system

Automated multistoried car parking system Friday, November 7th, 2008  »  Posted By Ranjith  »  Total 352 Comments

Introduction Basic idea Hardware description Display section Keyboard, Indicator & Beeper section Lift & motor section Sensor section LCD section Software program 1.Introduction: Automatic multistoried car parking system helps to minimize the car parking area. In the modern world, where parking-space has become a very big problem and in the era of miniaturization, it is [...]

Automatic Railway Gate Control & Track Switching

Automated multistoried car parking system Thursday, November 6th, 2008  »  Posted By Ranjith  »  Total 617 Comments

Present project is designed using 8051 microcontroller to avoid railway accidents happening at unattended railway gates, if implemented in spirit. This project utilizes two powerful IR transmitters and two receivers; one pair of transmitter and receiver is fixed at up side (from where the train comes) at a level higher than a human being in [...]

DC Motor Control using IR data communication

DC Motor Control using IR data communication Thursday, November 6th, 2008  »  Posted By Ranjith  »  Total 32 Comments

Current generation moves into wireless technology. Every one wishes to use remote controls. In this way, the speed of the DC motor is controlled by IR rays. IR rays get modulated with combination of data signal and carrier wave of 38 kHz. At the received end, the modulated signal is demodulated which is given to [...]

To calculate area and circumference of the circle

Thursday, November 6th, 2008  »  Posted By Ranjith  »  Total 0 Comment

Let us start from the beginning. Here discusses a model program for calculating the circumference and the area of the circle, where the radius is specified by the user. Logic: As we know, Circumference is ‘Pi’ times diameter of the circle and Area is ‘Pi’ times the radius squared. Implementing the same is the main [...]

Device control using Telephone

Device control using Telephone Wednesday, November 5th, 2008  »  Posted By Ranjith  »  Total 132 Comments

Controlling devices using switches are common. From  a   few   decades  controlling devices using    remote  control   switches like infrared remote control  switch,  wireless remote control  switches,  light   activated  switches  re becoming popular. But these  technologies  have their own limitations. Laser beams are harmful to mankind. Some  technologies  like  IR  remote control are used for short distance  [...]

DPSK Modulation and Demodulation

DPSK Modulation and Demodulation Wednesday, November 5th, 2008  »  Posted By Ranjith  »  Total 8 Comments

Differential phase shift keying (DPSK), a common form of phase modulation conveys data by changing the phase of carrier wave. In Phase shift keying, High state contains only one cycle but DPSK contains one and half cycle. Figure illustrates PSK and DPSK Modulated signal by 10101110 pulse sequence

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