Alarm system for use on bicycle, has plug including two resistors, where microcontroller measures total resistance, which is equal to sum of resistors, by discharging capacitor through resistors

摘要

The system has a box mounted on a bicycle, where the box includes a cable (1) consisting of a number of wires, a plug (2), a capacitor (7) and a microcontroller (6). The plug includes two resistors (3, 4), where the microcontroller measures the total resistance, which is equal to the sum of the resistors, by discharging the capacitor through the resistors.