K.Kalaiselvan, SP.Umayal, T,Sengolrajan, P. Suresh Pandiarajan,. “DETECTION OF VOLTAGE AND FREQUENCY VARIATIONS IN POWER GRID WITH ARDUINO ”. Design Engineering (September 15, 2021): 2446-2452. Accessed May 5, 2024. http://www.thedesignengineering.com/index.php/DE/article/view/4337.