SIMPLECIRCUIT鈩?/div>
Low Cost Iron Safety Timer
Author:
Jason Wolfson
Lipider Corp.
Duxbury ,MA
USA
email: jason@ultrnet.com
FIGURE 1:
FLOWCHART
Power-up
Turn on Triac
INTRODUCTION
Clothes irons and curling irons are high powered appli-
ances that can start house 鏗乺es. 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 鏗亁ed amount of time
(without motion/use). Then it will shut-off power. A reset
switch will restart the appliance.
Zero Detect?
Yes
Decrement time
No
Time-out?
Yes
Turn off
No
Check switch?
Yes
No
FIGURE 2:
SCHEMATIC
Vcc
GP2/TOCKI
Load
GP3
GP1
PIC12C508
Microchip Technology Incorporated, has been granted a nonexclusive, worldwide license to reproduce, publish and distribute all submitted materials, in
either original or edited form. The author has af鏗乺med that this work is an original, unpublished work and that he/she owns all rights to such work. All
property rights, such as patents, copyrights and trademarks remain with the author.
漏
1997 Microchip Technology Inc.
DS40160A/3_022-page 3-15
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