I have a *wireless *mouse which lasts for more than 6 months on 2 AA
batteries. This mouse has 5 buttons, a LED and a 2-axis scroll wheel. I'm
sure a lot of engineering was put on the power usage problem, but this
shows that there's absolutely no need for draining much power.
For example, the Idle current on the $4.40 Atmega32u2, an AVR
microcontroller which has USB support, is ~250uA@1MHz, with as little as
4.6uA on Power-down. Probably add a little for the USB peripheral.
For simplicity's sake and easy hardware implementation and availability,
I'd go for I²C support. I2C is widely available on most microcontrollers
and is very simple to use, allowing hot-pluggable low-speed multimaster
communications. It was even used on Nintendo Wii's controllers to allow
pluggable accessories. To implement it, a $1.18 Attiny25V will do (some
other microcontrollers may even be cheaper), which uses ~60uA@100KHz on
Idle. This is more than enough to operate some buttons. I'd personally go
for the $1.77 Atmega48PA, with 7uA@128KHz/2V on Idle, including the
Internal RC Oscillator.
--------------8<--------------8<-------------
*Ronan Paixão*
2011/12/7 <n8...@yahoo.com>
> Curt,
>
> I was thinking more along the lines of NiMH or LiPo rechargeable
> batteries, but Bruce does bring up a point in his latest post.
>
> Matthew Pitts
> N8OHU
> Sent from my Verizon Wireless BlackBerry
>
> -----Original Message-----
> From: "Curt, WE7U" <curt.w...@gmail.com>
> Date: Wed, 7 Dec 2011 13:27:47
> To: Freetel-codec2<freetel-codec2@lists.sourceforge.net>
> Reply-To: freetel-codec2@lists.sourceforge.net
> Subject: Re: [Freetel-codec2] How to build microphones with device control
> buttons
>
> On Wed, 7 Dec 2011, n8...@yahoo.com wrote:
>
> > There is an answer for that; power the mike with two AAA batteries. More
> correctly, use the batteries for backup if or when you're running off of a
> DC power source other than a running car or DC power supply.
>
> Just as long as mic/speaker/PTT work when the AAA batteries go dead (They
> might do that a lot: AAA batteries suck!).
>
> One would need to worry about battery acid in the MIC sometimes too, so
> need cleanable/replaceable battery contacts at the least.
>
> --
> Curt, WE7U. http://www.eskimo.com/~archer
> Lotto: A tax on people who are bad at math. - unknown
> Windows: Microsoft's tax on computer illiterates. - WE7U.
>
>
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