Happy new year folks!
DIYdrones hardware development team needs some help, if you think you can contribute in something please PM, our requirements are:
-Any microcontroller capable to handle a little web server can be used.
-The hardware must have WiFi access (behave as an access point).
-The hardware must have SD card slot (where you can store html files).
-Must be cheap (< $100).
The system must be capable to read a HTML file stored on the SD card (including pictures) and create a web server accessible via WiFi (acting as an access point). When the user is connected to the Wifi device-must type any direction like "http://192.168.1.100" and be able to load the HTML files stored on the SD. Something similar to a home router.
The HTML files must be able to read/write to the IO, analog and UART pins of the same microcontroller....
What we need from you are suggestions of the right hardware, software contributions and connections to anybody capable to help us.
Anyone? ;-)
Comments
unfortunately that last link i gave was not very helpful. lots of broken links and hardware that's way more than 100 bucks. the one link that did look promising was the stuff from ethernut (i think i saw that in a previous comment?)
http://www.ethernut.de/en/hardware/ethernuts.html
open hard/software running atmel.
and ethernut 3 has sd but would still need a wifi addon and i have no idea what it would cost to build it.
http://www.ethernut.de/en/hardware/enut3/index.html
@darren, yes but using a UAV Dev Board. I have two axis camera stabilization working with ArduPiratesNG code and an APM (ground test only), but as far as I know the only IMU that supports camera stab and tracking right now is UAV Dev Board. just switch camera with antenna of right design for passive tracking and if someone wrote the code i guess you could do an active tracker and pass db signal or something to tune the track.
but back to the topic. this is just for reference as it is something built at or below price point that has surprisingly rich feature set (but not much output power). it does not meet all the requirements but proves the concept doable at price i think. and perhaps a future model that has xbee 900 for telemtry, 802.11b/g for local area wlan, and 802.11n for still/video backhaul is not that far off.
http://www.open-mesh.com/index.php/enterprise-mesh/mr500-mesh-route...
Apparently it's a rebranded Engenius 9850 and is not as open as previous open mesh stuff.
And I found this page written back in 2006 which lists a bunch of the then available embedded ip type devices
http://www.beyondlogic.org/etherip/ip.htm
@darren you started this sub-thread with
I've just been agreeing that indeed yes, power and range are the issue, though you seem to have missed that with your later replies.
@jean the WL500gP is an interesting device, and the price point isn't bad. It would be an interesting platform with a couple of downsides:
- not designed for battery-powered operation (spec sheet says ~10W), which may be an issue for some users.
- it's a consumer product in a segment well known for rapid product churn, so it might be difficult to ensure supply for any length of time.
You could mitigate the latter with a wholesale port into the dd-wrt environment and count on migrating to another router with a similar feature set of course.
@darren so the brite-view unit is good for 65 feet LoS, the Zinwell unit makes it 70 feet. As a rule of thumb doubling the range out of an omnidirectional antenna squares the amount of power required (sphere radius/surface area ratio); you are looking at doubling at least five times to reach slightly less than 1km, or (if my dodgy math can be trusted) increasing the energy those units use to about the 46th power.
Again, there is a correlation between modulation technique, information rate and input power required. The units you linked above are probably not doing anything particularly interesting; with halfway decent antenna design you can move HD video over wifi at those distances without breaking a sweat.
But this has no applicability to moving it over the sort of distances that we care about in this hobby, and there aren't actually any signs that it's "coming" as a product anytime soon at all. We need new information encoding techniques that haven't been developed yet, and that's leaving out completely some of the assertions that can be made about the fundamental lower limit on the energy/information curve.
It's great to be optimistic, but informed optimism is key. 8)
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