On 2010-09-30 23:58:58 +0800, Zhang Weiwu wrote: > On 2010年09月30日 23:34, Zhang Weiwu wrote: > > # If it works outdoor it's enough. No need to use indoor. > > # If it can find the 'partner' in 150 meters it's good enough. 300 meter > > even better. Longer not needed. > > In fact, consider the low requirement of the application, a simple > device like this will do: > > 1. have a button on one device > 2. have a beep device on the other > 3. if I press the button it give a short beep so loud that I can hear > in 150 meters > > Then I will be able to use the nature radar: my hearing ability, to > locate the object. It's actually pretty precious, precious for my > scenario. With a single beep I have both angel information and distance > information. (To not to bother others too much, using a recorded dog > bark instead of a beep would be helpful.) >
Maybe radio could do what you need. A lot of household stuff like cordless phones and wirless routers work with radio, and have a range like you're talking about. Radio would work well outdoors. You can try googling "radio homing device". I found stuff like the following links at the top of the results: [1] http://www.hopperanalytical.com/blog/arduino-homing-device-prototype [2] http://www.spyreview.co.uk/2007/07/02/personal-homing-device-find-your-stuff/ Just an idea, Phil -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20100930181939.ga4...@kasploosh.net
