Password based Door locking system using PIC Microcontroller

This is a Password based Door locking system with GSM. The project mainly consisting of PIC microcontroller (16F877), 16x2 LCD Display, GSM Modem, Keypad and misc.(Relay, Crystal oscillator, power supply which is not shown in circuit diagram) The program is compiled using PICC Compiler and simulated on Proteus 8. All Header and simulation files are given at the bottom of this post. The default password is set as 123.

This project can be implemented anywhere where, higher security is required. If the user enters correct password, that is “123”, the relay gets active and opens the door. If an un-authorised person trying to access the system and enters the password incorrectly three times, the system gets locked and alert the owner by sms using Gsm modem. Once the system gets locked a count down timer will appear on lcd and you have to wait that predetermined time period.

How New Mobile Devices Charge Themselves?

self mobile charging


It has happened to everyone at some time: Just when you were in the middle of an animated conversation with someone on your cellphone, the battery gave up its ghost and went dead on you. Cursing the phone or even yourself had not helped any, had it? It is precisely with this in mind that various entities have been trying to get the batteries recharge themselves.

Are Robot Cars Smoother, Safer Drivers Than People

This is a question that many people have currently as robotic cars begin to become more of a reality in the modern world. Whether it's the one being developed by Google or all the other automatic vehicles that are being developed, it's a very exciting time to be alive if you love technology. Still, many people wonder if computers can replace humans as drivers and do a better job. Over at the MIT Technology Review, they've taken a closer look at this problem.

Robotic car without human driver
Photo credits: Juhan Sonin

Chris Urmson - from Google - made the claim earlier this year that Google's auto-driving Prius and Lexus cars are smoother than humans. He made the announcement at a robotics conference this summer in Santa Clara, California.

Binary Frequency Shift Keying (BFSK) using 555 Timer

Frequency-shift keying (FSK) is a type of frequency modulation scheme in which the digital information is transmitted through discrete frequency changes of a carrier wave. The simplest FSK is binary FSK (BFSK). BFSK transmits only the binary information of a message signal, zeros or ones.

Simple Object/Visitors Counter Circuit using LDR

After a short time off, I am back with a simple object/visitor detecting and counting circuit, dedicated to  all electronics hobbiests. This project counts how many objects or persons passed through its field of visibility. In order to keep the circuit simple, it is implemented with a single digit seven segment display, so it can count only up to 9. It is also possible to extend the count by interfacing more seven segment display and its driver IC’s (CD4033). This simple electronics project mainly consists of two sections