A piezo buzzer element fed into a sub-microamp comparator, which drove a=20
PIC interrupt pin  is what woke up early versions of an activity monitor=20
that a previous employer made.  The comparator threshold was really=20
small, milli-volts, IIRC.  Clamp the piezo voltage with diodes.  It=20
would be fairly sensitive, but more movement than just moving a mouse.

I think the newer technology uses a 3 axis Kionix accelerometer, with=20
programmable wake thresholds.

Joe W

On 8/29/2015 8:54 PM, Dwayne Reid wrote:
> My Microsoft Bluetooth wireless Intellimouse doesn't have a power
> switch and the batteries (2x "AA") seems to last a couple of years.
>
> My Logitech Laser V470 mice *do* have power switches but the
> batteries also seem to last a really long time.
>
> With both mice, I have to shake the mouse if it has been sitting idle
> before the mouse pointer starts to move.  I'm used to it and it
> doesn't bother me.
>
> dwayne
>
>
> At 05:01 PM 8/29/2015, Art wrote:
>> Hi everyone,
>>
>> I am trying to find a low power wireless optical mouse without a power
>> switch. While the microprocessor can be throttled back and the wireless
>> transceiver can sleep when no movement is detected, the LED must still
>> be powered as long as there might be movement. So, there is always need
>> for a power switch.
>>
>> I'd like to eliminate the power switch by using a vibration sensor to
>> turn the LED on when vibration is detected. I notice there are vibration
>> sensors that claim to be sensitive on ebay:
>>
>> http://www.ebay.com/itm/Reflection-NEW-801S-Vibration-Sensor-Sensitive-f=
or-Arduino-Highly-/291542737641?hash=3Ditem43e14d22e9
>>
>> OR
>>
>> I am trying to find a low power wireless optical mouse without a power
>> switch. While the microprocessor can be throttled back and the wireless
>> transceiver can sleep when no movement is detected, the LED must still
>> be powered as long as there might be movement. So, there is always need
>> for a power switch.
>>
>> I'd like to eliminate the power switch by using a vibration sensor to
>> turn the LED on when vibration is detected. I notice there are vibration
>> sensors that claim to be sensitive on ebay:
>>
>> http://www.ebay.com/itm/Reflection-NEW-801S-Vibration-Sensor-Sensitive-f=
or-Arduino-Highly-/291542737641?hash=3Ditem43e14d22e9
>>
>> OR
>>
>> http://www.ebay.com/itm/10X-SW-520D-Vibration-Sensor-Metal-Ball-Tilt-Sha=
king-Switch-NEW-Arrival-/271677896162?hash=3Ditem3f4143b5e2
>>
>> And, I can get a low power Schmitt trigger cmos gate that draws around
>> one microamp at 3 volts, and hook that up to disable the onboard LED
>> when the mouse isn't moving (vibration isn't detected).
>>
>> I also have an idea about changing the geometry of the optical sensor to
>> a reflective mode and narrowing the field of view for the sensor, so
>> that the LED can be run at a significantly lower but that's a topic for
>> another discussion):
>>
>> So, I have 2 questions........
>>
>> Does anyone have experience with these small vibration sensors, are they
>> sensitive to detect when a mouse is moved across a relatively smooth
>> surface?
>>
>> AND
>>
>> Does anyone know which model wireless optical mouse has the lowest power
>> consumption (best power management)? If so, what chip does it use??
>>
>> Thanks,
>>
>> Art
>>
>>
>> --
>> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
>> View/change your membership options at
>> http://mailman.mit.edu/mailman/listinfo/piclist
>


--=20
Joe Wronski
jwronski@stillwatereng.net
www.stillwatereng.net

--=20
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