30 January, 2013


Last semester, we had experimented with our first communication project- an obstacle detector. From our group of 10 people, 4 of us had great co-ordination and it was highly encouraging working with those technically intelligent minds. During our project-demo, we were pretty sure of having a new project at hand soon. And, we got this opportunity within 2 months after Texas Instruments announced its Analog Design Contest 2012.

Discussion of ideas is core-ingredient of any successful project.From soup to nuts, everything depends on the idea finalized. Thought-sharing process was highly interactive and argumentative(which always leads to progress) to decide which of the put-forth ideas were feasible and how would it change the present scenario. During that period, the newspaper headlines often read-"Robbers burst into house mid-day", "Crime-Theft-Robbery", "Accidents in kitchens due to gas-leakage", "Wastage of water by overflowing from tanks"...Also my neighbor when returning home from a vacation encountered an intruder in home and it was quite frightening experience. Finally, we decided to materialize the idea "A Sure Cure To Be Safe and Secured."

The project consist of integration of four modules which would keep a home safe and secured. One module was at door and other at the window. Doors and windows would chime and it alerts you when someone is coming into or leaving the house.Next is gas-leakage detector, which helps in identifying potentially hazardous gas leaks in kitchen. And lastly, considering the importance of pure water and unnecessary wastage by flooding of water-tanks, we added a water level detector. Having a home alarm with this modules is one of the best deterrents to prevent burglaries and home invasion. It gives one piece of mind, knowing that his family and home is protected. Knowing most of this critical situations happen only when owner is out of town or no-one is present is at home we added a new feature by embedding GSM technology which would send messages to owner's cellphone in alert situations so that he could take appropriate steps.


From our University, seven teams had sent their proposals, out of which five were given the opportunity to continue further. The entire contest was divided into three Phases, each having strict deadlines. In Phase 1-A, the faculty mentor in each team had to send a letter confirming that team was willing to take part in the contest abiding the Rules and Regulations(Deadline-5th August,2012 !). The Components Request had to be uploaded in which a budget of $200 for hardware development boards/kits from TI and $100 for TI components (along-with some free TI components) was given .(Deadline-15th August 2012-Indian Independence day !)

In Phase 1, Analog System Lab Starter Kit (ASLKv2010 Starter Kit) was provided to each of the participating college and each team was given a different problem statement. My team had problem statement regarding a non-inverting differentiator built using TL082CP Op-Amp from Texas Instruments.
We had to derive its transfer function, stimulate the system and obtain frequency response, build it using starter kit and compare GB through all three methods-(theoretical, practical and stimulated one). This is small video throwing light on the experiment we performed.

For the next phase, TI provided us with components before their deadlines (30th September 2012). We were expected to complete the hardware and software design and implementation and testing and submit the final report alongwith video demonstration of prototype by Jan 26,2012 i.e. Indian Republic day(another deadline !) This was the main phase which carried 70% weightage of final evaluation.


Our complete implementation is made up of four modules taking input from its surroundings based on its use, acting like a cluster of four inputs to a micro controller which in turn processes then input and passes the desired output to the GSM module which in turn does the processing of input to it and output in form of text message to the owner of the security system.

The very first module of the system is obstacle detector for door, which works on IR based sensor. Because of it being in small size, it is easy to implement and hide, which detects the vulnerable intrusion of any kind with the changed values in receiving the IR signal back from and to the transmitter.

The second module consists of the Ultrasonic motion detector, it works on ultrasonic waves being transmitted and received, as soon as it detects and movement in air, (sensitive up to meters and small detections), and glows the LED and a buzzer with input signal to micro-controller. The sound coming out of the buzzer is too loud and high pitched making it easier to hear.

The third module is a gas leakage detector. What it does it that it contains a Gas sensor, which detects the gas and signals the output to the micro-controller with an alarm through buzzer. The circuit is kept small and low powered so there is no generation of spark in any case.

The fourth module consists of the water level detector, which works on four different levels of aluminum wire exposed to the water directly at different heights and corresponding LED’s at different heights too. This let the user to know about the water level in the tank. It is cheap circuit made up of few transistors and resistors without any IC. It works efficiently at different levels making it easy for the user to keep check on the level of water.

All of the four modules, are connected to the Micro-controller (Arduino, in our case), which receives the high signal as a trigger to perform specific tasks related to the respective signal generators.

Arduino triggers GSM in all of the four cases, it act as an interface between the sensor modules and the GSM. The GSM is sent a code respective to the module generating signal which is then processed and GSM sends the message to the user.

The working Demonstration of our project can be found here .


The most important thing which I learned was working as a team how to analyze task requirements, questioning, critically interpreting the material and qualities like conflict management and resolution, flexibility, negotiations, compromise, organizing meeting and time management skills. As we progressed we started learning many things like how an idea is implemented, how to proceed with different sparks that come to our mind, how problems crop up and how we solve them. This project deepened my interest into the analog systems. We searched and studied lot for the project to get it accomplished. And finally, lucky to have Texas project which gave a chance to learn and make something practical which we had been studying in theory till now.There is a huge difference in theoretical and practical approaches to anything in this world. One of the main reason is the due to the ideal situations assumed in theoretical approach .. :D The major source of learning by making mistakes. Getting lost is the best way to find new ways out. Overall it was indeed a very good learning experience which would help up taking new projects in future. 


The "Eureka Moments" when we would have the ouputs as desired.. :) and the head-banging moments when working for hours we were still struck at the same moment. :( And the day before DEADLINES ! I always wonder about the super-natural power every deadline has which makes 2-week work to complete in 2-days..!! :P

Lastly, I would like to thank Prof. Subhajit Sen, our mentor for providing us excellent guidance and my team-mates Vaibhavi Desai, Yash Shah, Vamshi Chenna, Saagar Takhi and Jineet Doshi without whom this project was hard to imagine. And of-course, DA-IICT for providing us necessary infrastructure to complete the project.

Thank You for spending your valuable time reading this blog. Any comments or suggestions are warmly welcomed. :)


  1. Blog nicely written and nyc workkkk!!!!

  2. ur blogs are as gud as ur captions !! :D

    1. Favorable responses of captions inspired me to write blogs..!!

  3. Remove the Hello World caption ! It looks very juvenile :P
    Baaki jordar che..haju aakhu nai vachyu pan ;)

    1. Done..!!
      Read it at your convenience boss..!!

  4. naiceee !! (y)(y)
    how about taking it to market? I saw the video too .. cheap water level detector can be a hit :P (one needed at my home only) You have the investors believe me ;)

    1. yeah.. Need to make a business model out of it.. !!
      We invested just 100 INR for water-level thing..cheapest and most useful..should I courier one to Baroda or Canada.. ??!! ;)

  5. Bravo Amazo group ... :) where (so-called) group-leader is the only DE-motivated guy who has stopped thinking in this domain of eleKtronics :p :D

  6. too nice blog :) May be we should have a website for our group what say ?

    1. Still the last task remains.. When are you free sir ? It wont take more than 24 hrs to make our website I guess !