If you new in microcontroller project. May be you want to build just a simple electronic project. Like Doorbell created by Quozl. He used microcontroller PIC 16F84 for the main processor. I know that we can build simple doorbell without microcontroller. But, take a look the feature of this project.
A microcontroller driven doorbell circuit with features:
* one second instant pulse output,
* one second delayed pulse output,
* two minute lighting output,
* latching has been triggered indicator,
* processor alive indicator,
* ignore additional trigger for preset duration.
Do you want to build the project? Ok, here is the source code, schematic and the pcb.
source
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