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Toothbrush Timer


Toothbrush Timer
It has been known since Einstein that time is relative. This seems to apply particularly to children, who can make seconds and minutes seem like days and years when faced with unpopular chores like cleaning their teeth. To get the little dears to spend the three minutes recommended by experts on their teeth, parents concerned for the dental health of their children can resort to electronic means. And so much the better if you can get your children to help out with building the device!
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

R1 = 9-way 1k SIL array
C1,C2 = 22pF
C3 = 100nF
C4,C5 = 10µF, 63V, radial
D1 = LED, green, low current, 5mm
D2-D6 = LED, yellow, low current, 5mm
D7,D8 = LED, red, low current, 5mm
D9 = LED, blue, 5mm
D10 = 1N4001
IC1 = AT90S2313-10PC (programmed, order code 050146-41)
IC2 = 7805
X1 = 4MHz quartz crystal
Case: e.g. Bopla type BOS 503
1 wire link
PCB, order code 050146-1
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