JES_V2_N1_RP5 M. Rizwan Khan Basharat Ahmad Journal on Embedded Systems 2278 - 7895 2 1 29 35 ATMega16L, CVAVR, Protection A microcontroller based system is designed and developed to protect the house hold electrical appliances, from double phasing fault and fluctuation of line voltages. This device is tested with upper and lower cutoff voltages set at 150V rms as lower Limit and 250V rms as Upper Limit for the desired voltage range. The system is simulated and tested on Matlab R2010b and then implemented. The ATMega16 Microcontroller from ATMEL is used to implement the system. The Hex file for the microcontroller is developed using Code Vision CVAVR Programming pad and compiler. February - April 2013 Copyright © 2013 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=2237