Tuesday, January 4, 2011

Load Switching Mechanism

Since I will be testing our ATS system on a 3.5Kv generator, thus max ampere rating of this generator will be ~15Amperes. So I will be using 30A-heavy duty relays (like those found in a common UPS).   

I have successfully tested operation of these relays on breadboard. Now i will soon be inserting them in a veroboard for further trials, until we make a final PCB of the whole circuit near the end of my project.

Feedback Sensing Module..

I have designed and tested a sensing module on a breadboard that could inform the microcontroller that if main 220V-50Hz electricity source (i.e. from WAPDA) is available or not.
Next I designed, etched and developed a PCB and enclosed that PCB in a regular adapter casing for insulation and protection.


After successful testing of RTC (DS-1307) on bread board, I designed, etched and constructed a PCB that had a pocket for backup cell (CR-2032 [3v] ) so that it could hold time and calender even when the power of the reset of the circuit was cut-off.

GSM Controller continued..

Step 3:
Next I programmed the microcontroller (AT89S52) to send the same sequence of 'at-commands' through serial port. I verified via 'hyperterminal' that the microcontroller was sending those at commands in exact order, with proper delay. This part was really tough. It took me and my group-mate several nights to accomplish.

Step 4:   
It was the time for us to make a cable to connect mobile directly with the microcontroller, so we made a serial male-female cable with tx-rx pins in cross.
After a lot of hardware debugging we were able to successfully communicate mobile with the microcontroller.


Some of my projects...

Link to my Final Year Project Report
(technical details and C++ code)

Click Here

For Line Follower Details

Click here