Vijayalakshmi. R, Arul Selvan. C, Balakrishnan. K, Kavin Kumar. P and Mahabalaji. P 2017. Wireless digital circular system . International journal of intellectual advancements and research in engineering computations. 5, 2 (Aug. 2017), 1162–1167. DOI:https://doi.org/10.61096/ijiarec.v5.iss2.2017.1162-1167.