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[01:38:12] <orlock> tested my motor controller last night
[01:38:21] <orlock> it works, which is good - i havent used it for approaching 10 years
[02:00:51] <mrdata> good
[05:09:36] <rue_house> whats the specs orlock ?
[05:12:54] <rue_bed> I came up with a 'throttle control' yesterday for my electric wheelbarrow conversion
[05:13:21] <rue_bed> I'm going to use a t13 to generate pwm,goes to a driver, IGBT, and motor
[05:13:53] <rue_bed> 48V on the motor, battery supplied, but with onboard charging
[05:45:07] <Snert> I'll need to plug in my wheelbarrow.
[05:45:26] <Snert> unless it's solar?
[05:54:55] <Snert> I wouldn't mind a charge station on my manshed
[06:39:09] <lucas_ai> Hi
[06:40:56] <Jak_o_Shadows> hi
[06:41:16] <SpeedEvil> rue_bed: what's the mechanics?
[06:41:42] <SpeedEvil> rue_bed: I keep oscillating between a semi-sane wheelbarrow motorisation idea and insanity pepper driven ones.
[06:41:51] <lucas_ai> When I connect 3 USB cameras at 320x240x30fps, I don't have a big enough bus. I only have one usb3 host and need to plug in 6 cameras. How could I do this?
[06:42:14] <SpeedEvil> lucas_ai: First go back in time, and kill the USB committee.
[06:42:23] <SpeedEvil> lucas_ai: More seriously.
[06:42:41] <SpeedEvil> Are these 'superspeed' cameras - that is - do they run at 2.5Gbps?
[06:43:05] <SpeedEvil> If they are not, then the 'usb3 host' is actually a USB2 host.
[06:43:22] <Jak_o_Shadows> lucas_ai, you need more usb buses
[06:43:32] <lucas_ai> They're usb2 cameras. Usb3 cams are too pricy
[06:43:33] <Jak_o_Shadows> You can get PCI ones
[06:43:43] <SpeedEvil> And there is nothing you can do about this. USB3-USB2 transaction translators like found in some USB2 hubs do not exist
[06:43:48] <lucas_ai> And I only need 320x240x30
[06:43:49] <Jak_o_Shadows> I have friends who had to do the same for multiple microsoft kinects
[06:44:04] <SpeedEvil> 320*240*30 may work if you use jpeg or h,264
[06:44:18] <SpeedEvil> (not with windows 10)
[06:44:30] <lucas_ai> For 6 cams?
[06:44:48] <lucas_ai> It didn't work for me. Maybe h264 in the camera might be too pricy
[06:45:21] <SpeedEvil> What OS are you using.
[06:45:28] <lucas_ai> Ubuntu
[06:46:10] <SpeedEvil> Unless I'm confused (which is possible) - 320*240*30 should be about 24mbit.
[06:46:25] <SpeedEvil> That should be possible.
[06:46:32] <SpeedEvil> (in USB2 bandwidth)
[06:46:39] <lucas_ai> I plugged in 3 cameras and it only worked some times
[06:46:41] <Jak_o_Shadows> You might just be hitting the limit. More USB buses, like with
http://www.ebay.com.au/itm/PCI-Express-PCI-E-to-USB-3-0-2Port-PC-Expansion-Adapter-Card-For-Vista-Win-7-AU-/162059198071?hash=item25bb7b1e77:g:RDgAAOSwn9lXKa7T, would fix your problem.
[06:46:49] <SpeedEvil> that though
[06:46:57] <Jak_o_Shadows> On the other hand, listen to SpeedEvil, they are better at doing the calculations than I
[06:47:44] <lucas_ai> Jak I don't understand what you suggested. Should I buy PCI cameras instead, and plug them all in via PCI?
[06:48:08] <lucas_ai> Usb2 cameras are cheap. Others are probably prohibitively pricy for my project
[06:48:45] <SpeedEvil> lucas_ai: no, a USB3 port
[06:49:11] <lucas_ai> Connect PCI cameras to the pci-to-usb3 adapter and then to my usb3?
[06:49:31] <lucas_ai> Still would need to buy PCI cameras. Aren't they pricier than usb2?
[06:50:04] <SpeedEvil> More USB ports, USB cam
[06:51:27] <Jak_o_Shadows> Connect usb cameras to the usb ports that are connected to PCI
[06:51:36] <lucas_ai> Oh! I get an extra 2 USB ports
[06:51:54] <Jak_o_Shadows> You may potentially need one for each camera
[06:51:57] <Jak_o_Shadows> depends
[06:51:58] <lucas_ai> Yeah that'd be enough for 6 cams. What if I wanna go up to 12?
[07:16:00] <deshipu> why limit yourself?
[07:22:41] <veverak> lucas_ai: wifi cameras
[07:22:48] <veverak> usb cam + rpi3 -> streams over wifi
[07:22:59] <veverak> much mroe scalable than having tham on one machine
[07:24:45] <SpeedEvil> Or actual ethernet, which is more likely to work for >2 cams
[07:25:05] <veverak> or ... :)
[07:47:03] <deshipu> or an intricate system of mirrors
[07:47:20] <deshipu> and prisms
[07:55:03] <veverak> :D
[07:55:13] <veverak> deshipu: they need to be rotating
[13:13:36] <veverak> https://lh3.googleusercontent.com/Ib86iFS9FJl48exfpBQLfCPI3tcpbcj67jahggJVMtPM0FY8mMDyOfe980WgAt9_veN71GoKCg=w1720-h968-no
[13:13:39] <veverak> cool
[13:24:37] <deshipu> veverak: interesting how bat is more like insect than a bird
[13:24:49] <deshipu> veverak: I wonder if it's because it's what it eats
[13:26:20] * veverak needs to know moreb iologist
[16:51:09] <[VEGETA]> what does "switching current" here means:
http://www.monolithicpower.com/DesktopModules/DocumentManage/API/Document/getDocument?id=882
[16:51:23] <[VEGETA]> i want it to provide the load with 3 amps
[16:51:50] <SpeedEvil> 404
[16:54:07] <[VEGETA]> here it is:
[16:54:08] <[VEGETA]> http://www.digikey.com/product-detail/en/monolithic-power-systems-inc/MP3213DQ-LF-P/1589-1154-1-ND/5298241
[16:55:56] <SpeedEvil> Are you really needing something very small?
[16:57:15] <SpeedEvil> you do know that needs about a dozen external components?
[16:58:25] <SpeedEvil> Anyway, that is the current going through the switch
[16:58:53] <[VEGETA]> yes
[16:59:00] <[VEGETA]> i need a converter for 3 amps
[16:59:04] <[VEGETA]> output current
[16:59:11] <SpeedEvil> It will not provide close to 3A in * input volts watts
[16:59:22] <SpeedEvil> at what otuptu votls?
[16:59:49] <[VEGETA]> v out is 12 volt
[17:00:13] <SpeedEvil> That might provide 600mA@12V
[17:00:44] <SpeedEvil> Wait what is the input volts?
[17:00:56] <[VEGETA]> the input is 5-8 volts
[17:03:11] <SpeedEvil> Why are you trying to make your own PSU?
[17:03:15] <[VEGETA]> do you know a chip that boost it to 12v @ 3 amps
[17:04:00] <SpeedEvil> If you're asking that question, it's probably better to go for a prebuilt module in most cases
[17:05:03] <[VEGETA]> no, a regulator chip is enough for me
[17:05:41] <SpeedEvil> Go to TIs website, enter your input voltage and output voltage and currents, and get a variety of complete designs
[17:07:19] <SpeedEvil> http://www.ebay.co.uk/itm/LM2587-DC-DC-Boost-Converter-3-30V-to-4-35V-Step-up-Power-Supply-Module-5A-MAX-/311525105897?hash=item488857e0e9:g:~vAAAOSwwPhWlhEA or
[17:09:45] <[VEGETA]> this is only 4v, i need 12
[17:10:27] <SpeedEvil> It can be set up to 35V output
[17:10:57] <[VEGETA]> and still output 3 amps
[17:12:31] <SpeedEvil> That particular one will struggle to hit 1.5A@12V - that was just an example of what's available. Go to TIs website, use the configurator
[17:42:40] <[VEGETA]> ty
[19:22:23] <rue_house> ugh, nobody on the mp3 pirate sites is requesting anything interesting
[20:43:43] <anonnumberanon> sup
[20:45:07] <Casper> has anyone here built an air exchanger with heat recovery? :D
[20:45:15] <anonnumberanon> ideally you make your own boost converter to learn how SpeedEvil but it may not be worth the effort if that is only a tiny percentage of a much more important system that you are building.
[20:46:11] <anonnumberanon> SpeedEvil, and for those price ranges i would rather order one that has a 7 seg display which tells you the voltage.
[20:46:39] <anonnumberanon> only like a dollar more or two, yet very useful (and nice in a geeky way)
[20:46:54] <SpeedEvil> anonnumberanon: yeah - it depends on the details - for example - if he's running from two Li-ion cells, he will absolutely need a battery managment system
[20:47:16] <SpeedEvil> Or at the very least something to cut off when battery voltage drops too low to avoid killing the cells
[21:16:13] <anonnumberanon> yeah man
[21:16:24] <anonnumberanon> either a loud alarm when it goes low
[21:17:04] <anonnumberanon> or straight up a circuit that shuts down the entire th;ing but you may need a pretty strong MOSFET or something?
[21:22:34] <SpeedEvil> That depends.
[21:22:46] <SpeedEvil> Sometimes simply turning off the motor driver is adequate.
[21:23:06] <SpeedEvil> But I note that a 0.001 ohm FET that can cope with 600A is well under $10 these dasy
[21:25:46] <SpeedEvil> http://www.digikey.com/product-detail/en/fairchild-semiconductor/FDB0105N407L/FDB0105N407LCT-ND/5892119
[21:26:23] <SpeedEvil> 0.0008 ohms, 460A, $5
[21:26:34] <anonnumberanon> heck!
[21:26:41] <anonnumberanon> constant 460A?
[21:28:17] <anonnumberanon> Rds On (Max) @ Id, Vgs 0.8 mOhm @ 50A, 10V
[21:28:57] <SpeedEvil> Annoyingly, the datasheet won't open here
[21:29:29] <SpeedEvil> http://www.digikey.com/product-detail/en/ixys/IXTT440N04T4HV/IXTT440N04T4HV-ND/6053918 is one which will
[21:32:55] <anonnumberanon> Wait what was the OP's application again? I wasn't here.
[21:50:44] <SpeedEvil> He was unclear
[21:50:56] <SpeedEvil> he wanted a booost PSU from 5-8V to 12V@3A
[21:51:03] <SpeedEvil> And diddn't want a canned module.
[21:51:43] <SpeedEvil> And seemed to not really be asking the right sort of questions to be able to successfully make a boost SMPS@36W
[22:00:05] <anonnumberanon> <SpeedEvil> And diddn't want a canned module.
[22:00:21] <anonnumberanon> What is a "canned module" and why didn't he want that?
[22:57:46] <SpeedEvil> anonnumberanon: a prebuilt power supply board