Hi Marino,

What type of mouse is it???

My mouse does an initialization when it is first powered up, drawing 30=20
mA for about 10 seconds. I'm not sure a fet across the power switch is a=20
good idea, mostly because mosfets don't like slow rising input=20
transitions and an RC time constant will make the gate voltage=20
transition horribly slow.

My idea to defeat the oscillator after the wake up timer expires leaves=20
the mouse in a mode that consumes near zero power AND that allows it to=20
continue scanning almost instantaneously when the wake up timer=20
indicates mouse movement.

I have some micropower comparators on order and a mess of sensors.. Time=20
will tell which (if any) method works.

Any other suggestions?? Seriously, I appreciate any input!

Thanks all suggestions.

AG



On 10/01/2015 08:30 PM, Isaac Marino Bavaresco wrote:
> I just turned my mouse off and on again, and immediately moved it. I
> could not notice any turn-on delay.
>
> I think that a good design could be using an N-Channel MOSFET on the
> negative battery wire (or a P-Channel on the positive wire) and a piezo
> transducer to its gate, with a very large resistor from gate to source.
> The resistor and the gate capacitance would create an R/C timer that
> keeps the mouse on for a while and then turn it off automatically. A
> movement would make the piezo transducer to produce a voltage spike that
> charges the gate capacitance again.
>
> This circuit would "harvest" energy from users movement to keep the
> mouse on and would not use any quiescent energy from the battery.
>
> Perhaps an external capacitor and a Zener diode may be necessary.
>
>
> Cheers,
>
> Isaac
>
>
> Em 01/10/2015 17:39, James Cameron escreveu:
>> On Thu, Oct 01, 2015 at 08:02:45AM -0400, Art wrote:
>>> So, my question is WHAT METHOD DO I USE TO STOP THE MOUSE FROM DRAWING
>>> CURRENT FROM THE BATTERY WHEN THE WAKE UP SENSOR TIMES OUT??
>> No idea, it would depend on the design of the existing circuit, and
>> the microcontroller code already in place.
>>
>> You might also consider replacing the battery with something of
>> greater energy density.
>>
>
>

--=20
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