DARKROOM TIMER Project

A DARKROOM (or common process timer) has been
developed because of raw stock film changes etc.
to normal Ortho Film and Riston Exposure needs

Note : No Electronics magazine here in Australia has
EVER designed or presented a 'usefull' timer that can
be used (in a darkroom) to control Exposure of an accurate
repeatable procedure for the production of Ortho B/W negatives
or to provide repeatable UV Exposures for RISTON clad
circuit boards, I have searched from 1939 to present day.

This project 'PROTIME' can be presented as a single (large board)
for excellent training for would be programmers (of PICs)
who can develop up an *.asm then a *.hex  so as to make a
commercially designed circuit board operate with all full functions
The circuit board has been developed and tested and is used
by some TAFE colleges / High Schools for internal training
as well as us here as a commercial Circuit Board maker for
day to day common use in our manufacturing procedures.

This project HAD to be developed when 'muggins' me misplaced
our 'STAG' timer and I was advised by a magazine editor
"that NO One uses LED's these days" . . . .  quote, unquote
and for me "to use a RED Torch and a Wall Clock", hmmmmm
then when I researched EVERY Electronics magazine, they
all resulted in NOTHING EVER was anyways practical
to ACCURATELY operate the 'Exposure light/s' and
now the added luxury of a turning off/on the 'Safelights'
while you are 'focussing' or setting up etc.
in case you were using an 'enlarger' for prints
No, it does NOT have PAY TV, or MUSAK background
It is a real useable DARKROOM TIMER with some nice frills
one minor item, Traffic Lights these days use LED's and NOT Incandescant or CFIL's

RED LEDs for normal Ortho B/W film or RISTON 'AE' exposures
GREEN LEDs if you are using PHOTO-TYPESETTING B/W Film

To suggest using LCD's in a darkroom is a sure sign that the person
has NO working understanding of commonsense correct procedures
Darkroom means NO White light, even from idiotic small LCD's with
'white' Backlights, as even this can/will fog Ortho Film for negatives

for more information send an S.A.E. and
ask for PROTIME 'checkplots' of the project
(A,B,C,D are on a ready to go (as is) circuit board)
for T.A.F.E. PIC writing applications useage
PROTIME project will be RCS 2033a(abcd), 2033e, 2033f
(PROTIMEE has a plug in o.9" set of LEDs for remote use)
(PROTIMEF has a plug in set of JAYCAR Maxi 2.3" LEDs)

The circuit board set can be sold as a '1 piece' with a fully working
PIC 16F84 Pre-programmed microcomputer (I.C.),
also the blank project boards are available to anybody who
wishes to write a program for their own (from asm > hex) as a
PIC programming (personal or class) exercise, it is called
'reverse engineering' for a proven 'tested' circuit board
or it can be cut into 3 (4) separate boards, (no charge)
and we suggest the (A+B) and the (C+D) sets so as
it can drop neatly into a JAYCAR HB6094, sloping panel
type Jiffy box, RED Perspex drop in front cover panels
will also be available for final appearances upon asking.

some photographs will appear here in a few weeks
when slack Bob gets around to taking them
and putting them up here on the web.

Section B ----:----------- Section A ------------:----------- Section D on top of Section C
(240v Safelight & Exposure) --- (Main PIC CPU & 7 Segment Driver) --- Push Buttons and LED Displays

click onto any section for an explanation of 'what it does' &'how it works'