dbc

Member Since: October 26, 2007

Country: United States

  • Indeed. Or bend the leads back, and then fill the 1x1 brick space under it with a 1x1 plate and a 1x1x2/3 wedge http://www.bricklink.com/catalogItem.asp?P=54200 – problem solved. Or use a 1x2 wall element http://www.bricklink.com/catalogItem.asp?P=4865 – Or any number of other solutions. Some people just don’t understand Lego design grammar.

  • I don’t have a problem with the new studio, at least after the audio kinks were worked out. But new product Friday is about the content – you know, actual new products. Sure, some weeks there will be less to talk about than others – so don’t feel the video needs to be X minutes long. Information density is what it’s all about.

  • Two different questions. If you look at the actual data sheet, it appears to have what they call a “view cone” of 25 degrees. As to how small of a thing it will respond to inside that cone, I haven’t found anything.

    Sounds like what you want to do is go to Target and buy a Neato vacuum cleaner and give it a LiDAR-ectomy.

  • The motor in the ROB-13260 has a tail shaft, and these don’t :( That’s a total bummer. Why-oh-why can’t we get motors with a tail shaft suitable for mounting encoders? That is one of my biggest frustrations in sourcing parts for robots. Really, it makes me want to fly out to Boulder just so that I can slap somebody…. sooooooo close to having an interesting product. How about doing the ROB-13260 without the wheels but with the encoder? Or just the motor from the ROB-13260 that includes a tail shaft?

    BTW – seems like you finally got the audio acoustics right in the new studio. Much much better.

  • The audio is an improvement over last week. Not as good as the old set, though.

  • OK, so my memory was off on most of the specs I stated above, but still, Leaf cells available here: http://www.hybridautocenter.com/

  • Me, too. The set is pretty bland. And the “I’m trapped in an empty shipping container” audio is sub-optimal as well. Just part of the joys of a new building, I guess. I presume we will see incremental improvement.

  • Gnarly. It would look gnarly. Look up cell balancing chips that can handle 10 cells, and the circuits that go with them. And that is just the balancing side, not the charging side of the battery controller. Most battery packs like that have a microcontroller overseeing the battery pack state-of-charge, with temperature monitors and the whole works. You might look at getting a replacement cell for a Nissan Leaf (there are after-market places where you can get them) I seem to recall that the SMBus protocol to talk to the Nissan battery is documented. I think the Nissan pack is 90V or so, though, if memory serves.

  • So, I came here to ask a similar question. I’m maybe a little further along in research. There are parts that can charge 2-4 LiPo cells in series, with over volt protection and correct charge regime. For instance, MCP73213, 10 pin 3x3mm package. There are probably others, I’m not too far along with Googling and quizzing friends. Then cell balancing is (I gather) typically done with a separate part, such as a BQ29200, also a no-see-um package, also the result of only a few minutes googling.

    So another thing to guard against is undervoltage and excess current draw. I presume there are battery monitor/cell-balancers that have under-voltage outputs that could drive a FET switch or something to disconnect the load at low voltage.

    Anyway, it sounds like we have similar needs. I’d really like to use two of these in series to get 7.4V, and have some kind of bullet-proof charge controller circuit to use with them. I’d like to know what you find.

  • Certainly something needs to be done about the audio. Close mic'ing and something to kill the reverb would help tremendously. The room is way too live.

No public wish lists :(