Modified GSM based data logger system with two way communication

In institution., staff monitoring is predominantly based on manual entries. It requires man power and additional cost. Manual entries have greater possibility of error occurrences., so the manual entries were replaced by data loggers. The conventional data loggers are built with fewer features which comprises of fingerprint identification and data acquisition. In this paper we have proposed a modified model of data logger with microcontroller-GSM interface which possesses two way communications. This device sends a message to the staff prior to the schedule. The finger print of the entering staff is registered in the data logger and it is compared with the database and his or her entry is marked.