| 摘要 |
A device and method for detecting the viability of a fluorescent light tube of a vending machine is described. A light tube detector circuit includes a photodetector, a circuit means to compensate for ambient light connected to the photodetector, and an output line. A microcontroller may be used to monitor the phase shifts in the pulses generated by the light tube detector circuit, and to determine when one or more fluorescent light tubes are going bad.
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