Automated Teller Machine (ATMs) security plays a major role in day to day life, providing protection against physical and electronic theft from ATMs and protecting their installations is much considerable since people usage is increasing steadily now a days. The aim of proposed work is to implement low cost stand-alone security system using advanced sensors like k-band Doppler radar which has a coverage area of about 360 degree. In order to improve the security here we use gas sensor which is used to detect toxic gases and RFID module that is used to provide high security.