Alarm system design of young children being left on school bus based on pressure sensor array. Issue 6 (April 2019) - Liu, Yongjun
Abstract: One detecting method for young child being left on school bus based on the FSR (Force Sensing Resistor) sensor array was put forward and the alarm system was designed, which aimed at the frequent occurrence of safety accidents of young children being left on school bus in summer. Four square or circular FSR sensors were combined parallel together and placed on one seat of school bus as one module. Two strip shape FSR sensors were combined parallel together and placed on the ground between seats and on the aisle of school bus as one module. A certain number of modules placed on seats or aisle were combined parallel together and then connected with one input terminal of microcontroller. The resistance of each FSR module is inversely proportional to the pressure being applied. So, whether the young children were left on school bus alone or not can be detected by the resistance of the FSR module. To protect the FSR sensors were not damaged, the FSR sensors were wrapped in two soft silicone cushions. When the young children being left on the school bus alone was detected, the microcontroller would drive the speaker to play the alarm voice for warning the people nearby the school bus to recuse. The FSR sensors could detect the left child on the school bus accurately and the alarm system can warn timely. The detection method and the alarm system can be used for young children school bus to improving the safety of children riding.