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I'd like to announce the Open Hardware Project - Strobit Wireless Widget http://code.google.com/p/strobit

The Wireless Widget is a compact Arduino board with on board wireless and designed for low voltage and battery operation utilising the AtMega168V processor.  

The first v1.0 prototype boards are completed and under test by a number of volunteers.  

For more information and picture please visit the projects homepage and join the mailing list.

Regards,

Stephen Eaton
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Nifty. How much?

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Targeting ~$25-$30, however I will have final pricing once the latest changes have been made following user testing/feedback.
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Very nice. What kind of battery life are we talking about?
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I've not tested this battery life at the moment, but I'm using the low voltage 168, the atmega168V, as the processor, so in theory a long time if drivers, software etc allow for it.

Current power options are, via USB FTDI cable, onboard CR123A battery (if battery holder is installed), or via external 3.3v source.  The next revision board will probably have more power options, such as an on board LDO regulator for non 3.3v sources, i.e. lion/solar/wall warts and also a DC-DC boost regulator so it can be powered from a single AA for hand held applications.  

The way I've designed the board is that you you can reconfigure power options via solder jumpers, so if you want to bypass LDO or DC/DC then solder or unsolder a jumper.

Jean-Claude over at http://jeelab.equi4.com/2009/05/14/power-consumption-baseline/comment-page-1/#comments has done some good testing with this RF unit and is reporting average power consumption of 3.4uA on his sensor applications, he is using the standard 168 and the RFM12 unit, so really the 168v should be less.

One of my interests is Wireless sensor networks so low power consumption and power source flexibility was high on my list of design requirements, currently the commercial motes available are just way too expensive for 'around the house' type of sensor nets, I know I could use the xbees, but these get too expensive when you want a few nodes around the place.  I know these widget boards are not 802.15.4 compliant, so work needs to be done on a simple mesh, something that will fit in the 168 memory footprint, but they have the range and are low cost.  

From my initial tests the range is great indoors, no packet drops at all around my house which is a reasonable size (well filled 800m square block), I've yet to do outdoors, but I would guess 100m - 150m no problem.

Once I've nailed down the current board revision which is just about complete, one of my next projects  is a simple mesh network for these boards.

Currently jeelabs have drivers and a functioning network protocol that is fully compatible with these widget boards that allows for simple unicast with/without ACK and broadcasts which will suit most users.

Regards,

Stephen...
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The strobist site is very interesting. Can Arduino be used to build a strobe? (is it fast enough to turn on and off a strobe light?)
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3.4uA (micro ampers)? There must be a mistake.

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@glt  Its fast enough to trigger a strobe wirelessly, I'm sure you could build a strobe using a triac to discharge a capacitor into a strobe tube etc, but that was not the original point of the project, it was for a low cost reliable wireless trigger, but now it's more a generic wireless widget, so I can use it for my other interests, robotics, WSN....


@florinc as mention I've not tested, but Jean-Claude @ jeelab has, the figures he is quoting would be his sensor application that is basically in sleep/low power mode until required to read sensors and transmit the data, he also has the RF module in watchdog mode, where the module has the Rx/Tx off but switches on ever 32ms (or as configured) to see if there is a reception, so overall very low power is required.  When the RF module is in normal operation it draws about 12ma on Rx/Tx..  By using the power management of the 168 and the RF module you would be looking at 6+ months on battery, but again all depends on the application.
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