M
mpm
- Jan 1, 1970
- 0
This is general enough to be of use to several folks.
Anybody got a simple momentary keypad-switchable ON-OFF circuit for a
8051 (or similar)?
Figure about 100 mA MAX, and will be battery operated (9-Volt).
Program will run for a minute or so, then the device should shutdown
(under uPC control) until the next time it's needed. Probably do
this about 20 times a day. Battery lifetime is important.
MINIMUM cost, and minimum parts count would be nice too!
The only thing I can think of is a FET controlling the input to a
switch mode power supply / regulator. (But admittedly, I don't do
much battery-only stuff, and my solar design are higher current and
not easily adaptable for low cost.)
Thanks.
Anybody got a simple momentary keypad-switchable ON-OFF circuit for a
8051 (or similar)?
Figure about 100 mA MAX, and will be battery operated (9-Volt).
Program will run for a minute or so, then the device should shutdown
(under uPC control) until the next time it's needed. Probably do
this about 20 times a day. Battery lifetime is important.
MINIMUM cost, and minimum parts count would be nice too!
The only thing I can think of is a FET controlling the input to a
switch mode power supply / regulator. (But admittedly, I don't do
much battery-only stuff, and my solar design are higher current and
not easily adaptable for low cost.)
Thanks.