One of the mains undervoltage and overvoltage alarm circuits
Source: InternetPublisher:containsmachine Keywords: Alarm circuit light emitting diode BSP Updated: 2020/09/04
It uses three light-emitting diodes to indicate whether the mains voltage is normal, that is, whether it is within
the allowed fluctuation range of rated voltage ±10% (about 200~240V).
When the mains voltage is lower than 200V (reached by adjusting the potentiometer RPi), the yellow light-emitting diode VLi lights up; when the mains
voltage is higher than 240V (reached by adjusting the potentiometer RPi), the red light-emitting diode VLz lights up. When the voltage is within the normal range, only
the green LED VL3 lights up.
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