#robotics Logs

Jan 01 2013

16:07 rue_shop3 STRANGE
16:07 rue_shop3 search ebay for webcam NOTHING
16:13 rue_shop3 but manually searching I find hits that have webcam right in the title
16:13 GuShH maybe you searched on someone's e-shop
16:43 KimLaroux bolt torque max 55in-lbs 6.2Nm
16:43 KimLaroux all I have is a screw driver, any chance I go over that?
16:50 KimLaroux sorry KDE crashed, anyone answered?
17:07 eadthem kim possable
17:07 eadthem a fish scale and ratchet wrench would be best
17:07 eadthem even a open ended wrench would work
17:14 KimLaroux I have none of those
17:14 KimLaroux it took everything I had to remove the bolts, so if they were tightenned properlly, it's highly improbable I tighten them more
17:15 Tom_itx in lb isn't much
17:15 KimLaroux or at least I hope so
17:15 Tom_itx how big are the screws?
17:18 KimLaroux 1cm long, 5mm diameter, uses torx 25
17:19 Tom_itx did they have loctite or such on them?
17:19 Tom_itx you should be able to handle tighten them
17:19 Tom_itx safely
17:21 KimLaroux yes they have blue thread locker
17:23 KimLaroux thanks
17:27 Ademan Triffid_Hunter: A while back you mentioned you were using the MG996(r?) servos. Since I assume I will destroy a number of them with incompetence, I was looking for them cheaper... I found a number of "TowardPro MG996" servos on aliexpress, which are clearly ripoffs... Do you have any experience or thoughts on those?
17:28 Ademan Hrm, even hobby king seems to stock "TowardPro"...
18:17 Triffid_Hunter Ademan: those are the ones I have, they're ~$10-12/ea at hobbyking
18:17 Triffid_Hunter and yeah the TowardPro is clearly a brand heist but they work and they're cheap
21:54 Ademan_ If I wanted to control multiple (up to 12) servos from one board, does http://adafruit.com/products/815 look alright? Does anyone have something they'd recommend instead? (Short of designing my own board, which is a goal of mine, but a far off one)
21:59 orlok yeah
21:59 Triffid_Hunter Ademan_: I have a 4514 that I generally use for driving lots of servos from one timer output.. having it on i2c might be nice
21:59 rue_house YES! I got the camera streaming!
22:00 Jak_o_Shadows nice
22:00 rue_house I have the wireless tablet working
22:00 rue_house I have a WRT54G ready to put on a robot
22:00 rue_house I have a minipc ready to put on a robot
22:00 rue_house I have a robot with a working drivesystem and power distribution and motor drivers
22:00 rue_house and I have an avr board for it
22:00 rue_house this is good
22:01 orlok what sort of tablet?
22:01 rue_house http://www.ebay.ca/itm/400359682925
22:01 rue_house it works great
22:02 rue_house the only catch I see so far is that the screen isn't glass, its scuffing a bit
22:03 orlok i was going to say "that looks like mine"
22:03 orlok but they all look the same heh
22:03 orlok mine has the volume buttons next to the power button though
22:04 rue_house it has wifi and a web browser, which is all I really need for this
22:04 rue_house wireless robot with wireless controller
22:21 Ademan_ Triffid_Hunter: http://www.ti.com/product/CD74HC4514 ?
22:22 Triffid_Hunter Ademan_: yes
22:38 Ademan_ Triffid_Hunter: Hrm, so you just bit bang at the 4514 on a custom board?
22:43 Triffid_Hunter Ademan_: yeah basically, I put the servo index on the 4 inputs, I tie strobe and enable together and run those to the timer output pin
22:45 rue_house uh
22:45 rue_house 4017 people
22:45 rue_house you stay on the putput for the length of the pulse, then move on to the next servo
22:46 GuShH the putput!
22:46 rue_house http://eds.dyndns.org/~ircjunk/circuits/rc-dec.gif
22:46 rue_house do you see how it works?
22:46 rue_house http://eds.dyndns.org/~ircjunk/circuits/rc-enc.gif
22:46 rue_house there is the remote control sch
22:47 GuShH old school
22:47 rue_house you can operate 10 servos with "1 wire"
22:47 rue_house 4 pwm channels means 40 servos
22:47 rue_house I should make a library to do it
22:48 Triffid_Hunter ah yeah that'd work too, had the 4514 laying around thoguh
22:49 rue_house ah
22:49 rue_house android apps are c++
22:49 rue_house with HEAVY xml influence
22:50 Jak_o_Shadows heavy xml yes, but for basic stuff dont' you use java?
22:50 rue_house looks like c++
22:50 rue_house is it java?
22:50 Jak_o_Shadows Unless you're doing fancy stuff, yeah, java
22:50 Jak_o_Shadows the NDK is C++ though i think
22:51 rue_house hmm, how can I tell if this is c++ or java...
22:52 rue_house it would expalin why every app runs as its own user in its own VM thats resource limited
22:52 rue_house that would be the only way to make java apps not take down a device
22:55 Ademan__ Yeah, NDK is C and/or C++, most apps are java
22:55 rue_house know what processor this is?
22:55 rue_house mips or arm?
22:56 Jak_o_Shadows depends the device i think. ARM is more common
22:56 rue_house ah loks like mips
22:56 Jak_o_Shadows The virtual machine gives the choice of both
22:56 rue_house er
22:56 Ademan__ android is ARM, did I miss the context?
22:56 rue_house interesting, the os seems to be ported for mips, arm and x86
22:57 rue_house (4.0.3)
22:57 Ademan__ I'm relatively certain to be considered "android" on some level you must be ARM
22:57 rue_house 4.2 is arm and mips
22:57 Ademan__ the x86 port is unofficial afaik
22:58 DagoRed android doesn't need to run on ARM exclusively.
22:59 rue_house its just linux
22:59 rue_house ugh, I have to stay up anther hour
23:00 Ademan__ DagoRed: it's not a technical necessity, but I do believe some combination of legal and/or marketing makes Android officialy ARM only
23:01 DagoRed Not necessarily true. It is allowed to run on Atom based machines (has seen it). So x86 is perfectly fine.