Doorbell system and doorbell control device
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United States of America Patent
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Oct 10, 2017
Issued Date -
N/A
app pub date -
Dec 8, 2016
filing date -
Feb 1, 2016
priority date (Note) -
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Abstract
A doorbell system and a doorbell control device are provided. The doorbell system includes a doorbell control device, a transformer, and a doorbell interface device. The doorbell control device has a first pin, a second pin, and a third pin. The doorbell control device includes a speaker unit and a control unit. The control unit is configured to control whether or not the speaker unit produces sound according to a current or a voltage of the second pin. The first pin is coupled to the second pin. The transformer outputs an AC voltage to the first pin and the third pin of the doorbell control device. The doorbell interface device is coupled to the second pin and the third pin of the doorbell control device.
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