Quozl's Doorbell

| quozl@us.netrek.org | up |

18th September 2006

doorbell

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.

Pictures

Schematic

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.

in PostScript format for viewing if you have a PostScript viewer, or for use in xcircuit,

Timing Logic

Printed Circuit Board

Note: the board is intended for other purposes, so it is not excessively optimised. The component numbering doesn't match the schematic.

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,

Repository

darcs repository (see below for instructions).

Using Darcs

Darcs is a distributed revision control system by David Roundy designed to replace centralised CVS. The source is provided via darcs to encourage contributions.

install darcs : apt-get install darcs

checkout initial copy : darcs get http://quozl.linux.org.au/doorbell
(this creates a directory doorbell in your current directory)

propose a change : darcs record darcs send
(this sends a mail to me with your changes)

update : darcs pull
(this updates your directory with changes made by me and others)

install darcs :	`apt-get install darcs`
checkout initial copy :	`darcs get http://quozl.linux.org.au/doorbell` (this creates a directory `doorbell` in your current directory)
propose a change :	`darcs record darcs send` (this sends a mail to me with your changes)
update :	`darcs pull` (this updates your directory with changes made by me and others)

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