Protection against abusive ringing of doorbells is provided by a ring limiting circuit including ring counter and ring timer circuits. Protection can also be implemented in software executed by a digital processor such as a smart home central controller in a wireless doorbell installation.
An automatic doorbell driver that utilizes the power, wiring, and primary load of a conventional doorbell system. The automatic doorbell driver comprising coupling means for coupling the automatic doorbell driver to the conventional doorbell system; power supply means for supplying power to the automatic doorbell driver; sensing means for sensing an object in a proximity zone; and switching means responsive to the sensing means for coupling power to, and thereby controlling the energization and de-energization of, the primary load of the conventional doorbell system; whereby the automatic doorbell driver can easily convert the conventional doorbell system into an automatic doorbell system.
