MP022 Datasheet, PDF (1/2 Pages) List of Unclassifed Manufacturers – Low Cost Iron Safety Timer

SIMPLECIRCUIT™
Low Cost Iron Safety Timer
Author:
Jason Wolfson
Lipider Corp.
Duxbury ,MA
USA
email: [e-mail]
INTRODUCTION
Clothes irons and curling irons are high powered appli-
ances that can start house fires. Many times after leav-
ing for work you forget if you shut-off or unplug the
dangerous appliances. This timer will allow the appli-
ance to have power for only a fixed amount of time
(without motion/use). Then it will shut-off power. A reset
switch will restart the appliance.
FIGURE 1:
FLOWCHART
Power-up
Turn on Triac
Zero Detect? ^No
Yes
Decrement time
No
Time-out?
Yes
Turn off
No
Check switch?
Yes
FIGURE 2: SCHEMATIC
Vcc
GP2/TOCKI
GP3
GP1
PIC12C508
Load
Microchip Technology Incorporated, has been granted a nonexclusive, worldwide license to reproduce, publish and distribute all submitted materials, in
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© 1997 Microchip Technology Inc.
DS40160A/3_022-page 3-15