A GSM-Based Intelligent Monitoring System for Improving Robotics Laboratory Safety

Incorporating industrial robots into current robotics curricula has become a key component for engineering and technology programs. Recently, Toyota Motor Engineering & Manufacturing North America donated a Kawasaki ZB150S industrial robot to the Engineering Technology Programs at Northern Kentucky University. The entire Kawasaki industrial robot system was installed in a safeguard cage; however, the safeguard cage was not always able to prevent unauthorized students from coming into the working area of the robot. The lab manager/staff expressed an urgent need for a smart tool that could monitor occurrences of unauthorized operating conditions to help them improve laboratory safety. Thus, a Global System for Mobile (GSM)-based intelligent monitoring system has been designed and developed to provide a safe robotics lab operating environment for students. This intelligent monitoring system was divided into two subsystems: one was the Embedded Laboratory Environmental Monitoring and Robot Power Control (ELEMRPC) subsystem; the other was the GSM communication subsystem. The ELEMRPC subsystem received the presence-sensing signals from the light curtains at the cage entrance and disarmed the power supply of the robot when unauthorized students were detected. Additionally, the lab environmental parameters were monitored. The GSM subsystem wirelessly transmitted text messages (e.g., lab safety information) to designated cellular phones. These text notifications can alert lab manager/staff immediately to prevent potential accidents within the footprint of the robot safety cage. This paper discusses in greater detail the design, development, and hardware implementation of the robotics laboratory safety monitoring system.