The following link provides you detailed information on how to design a simple doorbell for home application. The consists of: AC power input, doorbell transformer, bypass switch, solid state relay, doorbell button, , capacitor, and a 5 watt power supply. The ATtiny11/12 is a low-power CMOS 8-bit microcontroller designed and produced by ATMEL semiconductor.

Simple Doorbell Wiring Diagram

Find more information regarding the design of simple here (source: cappels.org)

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