Posted by aonomus on January 13, 2011
So another ROV update, I did some tests of bilge pump motors as thrusters and got some interesting results
|1000gph w/ propeller
|500gph w/ propeller
These are some strange results that I need to reconcile before carrying forward, particularly the odd thrust value of the 500gph motor in forward.
Future plans involve testing nozzle shapes such as straight nozzles, nozzles with collimating fins (to reduce turbulent flow or increase laminar flow), and Kort rings. Anyone with expertise in this area feel free to chime in with comments.
Posted in Electronics, Robotics, ROV | Leave a Comment »
Posted by aonomus on November 20, 2010
So, because of the sheer expense of 6″ sch80 pipe and pipe fittings (read: several hundred dollars for a few feet of pipe and 6 fittings!), there has been a redesign!
Posted in Robotics, ROV | Leave a Comment »
Posted by aonomus on November 12, 2010
So besides the obvious song reference, I’m starting on a new long term project (as if I don’t have enough going on?). I’m going to be building a remotely operated vehicle (ROV) with a friend for fun and potential science. This has been on my list of things to do for ages, though prohibited mostly by cost. Being gainfully employed has its benefits (ie: money).
Stay tuned for more details, as the goal is to complete construction in time for summer 2011.
Rated depth: 100m
Rated pressure: 1.081 MPa or 156psi
sch80 PVC pipe for electronics pods, 1″ CPVC pipe for frame, and aluminum for cross-bars
Internal sealed lead acid batteries
Modified bilge pumps
Pressure, temperature, compass, internal monitors (temperature, voltage, current consumption, [humidity/water sensor]). Video over IP camera
Surface control computer
Onboard microcontroller with ethernet connectivity, control via tether.
Posted in Robotics, ROV | Tagged: Remotely operated vehicle | Leave a Comment »
Posted by aonomus on October 2, 2009
In the realm of intelligent battery chargers, there are far too many choices. Prices range from about $50USD to some in the $300 range and come with a whole variety of features. The problem is that the new emerging market is for cheap products that don’t perform, or don’t have the durability and quality expected for a complex device.
Most new intelligent battery chargers can charge, discharge, and cycle Pb, NiCd, NiMH, Li-ion, LiPo, and more recently LiFePO4. These chargers feature control over charging/discharging current. Contrast this to your ‘dumb’ chargers that are essentially trickle charge wall warts that push in around 0.5C that can overcharge NiCd/NiMH, or slow LiPo balance trickle chargers that come with RC helis sometimes.
The GT Power A8 charger sells for about $80USD + S&H, I got mine from HobbyCity.com. Read the rest of this entry »
Posted in Batteries, Electronics, Reviews, Robotics | Tagged: Battery charger, Review | 2 Comments »
Posted by aonomus on September 20, 2009
So my last post about an alternator to brushless motor conversion seemed to draw some interest, but people were asking some details so I drew up a quick diagram in inkscape last night.
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Posted in Electronics, Hacks, Robotics | 4 Comments »