A microcontroller driven doorbell circuit with features:
Note: this schematic predates the changes made for the printed circuit board, so some of the output port pins are incorrect. The PCB and the microcontroller source code are consistent.
Note: the board is intended for other purposes, so it is not excessively optimised. The component numbering doesn't match the schematic.
- 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.
Schematic
Timing Logic
Printed Circuit Board
- as PostScript for printing,
- as original for use by pcb,
Source Code
- assembly source code for use by gpasm,
- build instructions for use by GNU make,
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