[islandlabs] Farmingdale Meeting (was: gprs shield. neat)
Thu Apr 21 20:03:22 EDT 2011
After some discussion last night:
The next 3 items could make a good APRS system for if/when we have another loss of payload.
(the current system might become super-reliable)
Venus GPS. (Possibly Tony has this module already?)
Radiometrix HX1 300mW fixed-frequency APRS transmitter.
Joe has a new garmin, and we got good output from it. He wants to reconfigure the payload innards so the GPS unit sits in the "normal" position.
I'm not sure that's necessary with this new unit that's designed to re-acquire satellites forever. (w/ no button-pushing)
Either way, it sounds like it's close to flight-ready.
next up: testing to see how well it deals with duct-tape and in-the-field loss-of-signal situations.
Also, we found a "reset" string that might work with the old garmin etrex to get it to re-acquire satellites when it's at a user-button-prompt.
Unfortunately, that means either finding a feature of the existing APRS controller that can make use of this reset string...
reprogramming this APRS controller (based on a motorola freescale processor) or finding/building a different APRS controller.
Clearly, we want to launch balloons again as soon as possible.
(I'm paying rent on 2 helium tanks right now, and we have 2 balloons on-hand)
However, There's lots more we could do.
At about $2 each, I'd like to buy a batch of 50. Who's in?
PID controllers: Proportional/Integrative/Differential motor controllers
Proportional, like the governors on old engines.
Integrative (intended to average-out anomalous error readings
Differential (intended to understand acceleration, prevent overshooting target values/positions, dampen oscillations)
Of course, the big news is that we've got space at Farmingdale for now, and Bob thinks his place may become available soon.
There's lots going on.
The next meeting will be on wednesday at Farmingdale.
We could also do a weekend event. Lori would like to do dinner-time stuff at her house, and it's possible Jonathan could make it to a weekend meetup.
What do you guys think?
Questions? Comments? Suggestions?
From: list-bounces at freeculture.org [mailto:list-bounces at freeculture.org] On Behalf Of Jonathan Dahan
Sent: Wednesday, April 20, 2011 3:56 PM
To: [Island Labs]
Subject: [islandlabs] gprs shield. neat
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