#robotics Logs

Dec 13 2015

00:01 anonnumberanon oh it's permanent, I see
00:01 anonnumberanon opposed to ram
00:01 anonnumberanon does atmega328 have eeprom?
00:03 Hyratel not permanent
00:03 Hyratel Non-volatile
00:03 Hyratel yes. 2k of it
00:04 ace4016 1k i though
00:04 Hyratel IDR exactly. you can look it up
00:04 ace4016 thought too
00:04 ace4016 yea
00:05 ace4016 datasheets yay
00:05 anonnumberanon atmega328 has 1KB of eeprom, 2KB of sram
00:05 anonnumberanon according to datasheet
00:06 anonnumberanon atmega32A just has a LOT of pins, that's what i think comes into its higher price
00:07 anonnumberanon It basically makes access to all the ports easier
00:08 anonnumberanon they all have all the pins as physical output pins
00:08 anonnumberanon ports a, b, c, d
00:08 anonnumberanon http://www.binaryupdates.com/wp-content/uploads/2014/07/atmega32a-pinout-description.jpg
01:40 veverak http://hackaday.com/2015/12/12/solder-more-usb-ports-to-the-raspberry-pi-zero/ finally!
01:40 veverak :)
01:54 peepsalot i'd rather have a pine64
03:59 deshipu anonnumberanon: the dma cricuits do input/output directly from memory, bypassing the cpu
03:59 deshipu anonnumberanon: so loading the cpu won't affect their speed
04:03 SpeedEvil veverak: meh
04:04 SpeedEvil veverak: A hub chip alas. There is another 'real' USB port on the chip
04:06 SpeedEvil Also - a USB1.1 hub, really?
04:06 SpeedEvil That is just flat-out retarded
04:12 robopal question: I have an EPROM with a window on top, so it can be erased with UV light, but the datasheet says "One time programmable read only memory", can I reuse it or not? I am confused (I dont know my memories, sorry)
04:13 robopal do you guys know? I wonder if I should keep this chip or toss it
04:13 anonnumberanon usb1.1 can do 1.5 megabytes per second that
04:13 anonnumberanon should be enough for any raspberry pi usb use
04:14 deshipu SpeedEvil: do better
04:15 SpeedEvil robopal: you can. You programm it, setting high bits to low bits. Then you erase it with UV to use next time
04:15 SpeedEvil deshipu: I have done better - with usb2 hub chips, they are not expensive or hard to obtain.
04:15 robopal ok good
04:17 deshipu SpeedEvil: got a link?
04:18 deshipu SpeedEvil: to your pi zero hub project
04:18 SpeedEvil deshipu: it was using a tiny USB hub board on a eeepc
04:18 deshipu SpeedEvil: also, how does it compare price-wise?
04:18 SpeedEvil cheaper
04:19 deshipu nice
04:19 anonnumberanon you should tell the guy who made that post
04:19 SpeedEvil http://www.dx.com/p/1-to-4-abs-usb-2-0-4-port-hub-black-407710
04:19 SpeedEvil The board is tiny, and everythign is already on wires for ease of repositioning
04:20 SpeedEvil Sure, tehre are cases when it makes sense to do a board of your own.
04:21 deshipu like this case :)
04:22 SpeedEvil Well, yes. But not if you're going to make it suck by picking an outdated hub chip that does USB1.1 only
04:23 deshipu enough for a mouse and keyboard, really
04:24 SpeedEvil And crippling wifi networks or storage
04:25 deshipu nah, for network add an esp8266 to the gpios ;)
09:06 AgnanoD hi, does someone know a solenoid that can be open / close at rate of 120hz ?
09:07 AgnanoD also solenoid that need about 9v-12v dc
09:07 AgnanoD i'de like to control a water drip rate
09:11 maco an automotive fuel injector might work, although i do not think it will work @ 120hz.
09:12 robotust1a better make usual rotational valve + servo
09:13 robotust1a 120hz in the water you'll spend a lot of current
09:13 robotust1a or DIY own valve
09:24 SpeedEvil AgnanoD: how much water
09:24 SpeedEvil AgnanoD: drips never passively happen at 120hz
09:24 SpeedEvil Do you in fact mean 'run from 120V AC'?
09:24 AgnanoD ok wait a sec plz ill link something
09:25 AgnanoD here: https://www.youtube.com/watch?v=OtxlQTmx1LE
09:26 SpeedEvil yeah - you don't do that
09:26 SpeedEvil http://www.ebay.co.uk/itm/Hidom-Silent-Aquarium-Air-Pump-Fish-Tank-Quiet-Single-Twin-Valve-Tropical-Marine-/351064279143?var=&hash=item51bd0fc867:m:mKdIR2e2fuJ8-oWbJ8S2f6g
09:26 AgnanoD he said that the pump is 60 hz
09:26 SpeedEvil plus a slow flowing water
09:27 SpeedEvil the pulsating air pushes the water out as the air pulses
09:27 AgnanoD SpeedEvil, i think he said that the drip is falling in 60 drips per second,is it right?
09:28 SpeedEvil I diddn't watch it all
09:28 SpeedEvil the above pump pushes air at 60hz.
09:28 SpeedEvil There are similar pumps that pump liquid in the same manner. But the simplest way to do it - cheapest - would be to just use the air pump to push on a little bladder in the pipe
09:29 AgnanoD it looks like this is what i need.
09:29 AgnanoD he mention that the important thing is to make the drip rate at 60 hz and also the flash at 60hz
09:30 AgnanoD so i guess this pump will work for me.
09:30 AgnanoD thanks a lot
09:30 SpeedEvil It is possible to get water valves that will go this fast.
09:30 SpeedEvil It will not be $10 thouhg.
09:30 AgnanoD much expensive?
09:30 SpeedEvil very wow
09:31 AgnanoD so it's not good.ill go with the link that you post
09:31 AgnanoD it looks good to me
09:52 AgnanoD SpeedEvil, i just notice that this pump is just generate air,so it need to be inside a tank of water.what i need is a pump that pump the water and drop it in some rate ( 60/50 hz )
09:53 SpeedEvil yes - you'd add a little flexible bulb in the pipe to make it vibrate, commected to the air pump
12:17 anonnumberanon >commectified to the water air punp
12:19 anonnumberanon i just passed my final missing exam for my degree
12:26 Snert how did you do?
12:28 anonnumberanon passed, i took it at a teat center it was a bs class part of core curriculum
12:28 anonnumberanon all i needed is to pass it will transfer as transfer credit, no grade
13:18 rue_house arg, I hate it when I less a file and background the task... less foo.c &
13:18 rue_house it makes for a lot more keystrokes than should be required
15:27 akem its much easier to hack a 3D printer with fixed plate to print out larger sheets, just get longer head drivers/sliding bars, and a nice fixation onto a table
15:28 akem cause often you see the bottom plate moving on z or x/z
15:29 akem my quick though about 3d printers for tonight.
15:31 robotustra_ akem: C.O.
15:33 veverak akem: lol
15:34 veverak longer rods for example won't work forever
15:34 veverak you need to make them thicker also, to prevent "vibrating" of the plate
15:34 veverak also you still got problem with print speed
15:34 veverak stronger motor on moving on one axis to get "better speed" also results in bigger problems with heating
15:34 veverak (with the moving you cool it down)
15:34 veverak also
15:35 veverak bottom plate moving on z is much cheaper to make rigid construction :)
15:41 akem veverak you got one?
15:41 veverak 3d printer?
15:41 veverak yes
15:41 akem yes
15:41 akem which one?
15:41 veverak i3 (unfortunetly)
16:02 Keukpa I hear the i3 are good? I've got a Ultimaker 2, UP Box, UP 2 Plus and Duplicator 4s
16:02 Keukpa anyone know what can cause a device drop on and off the i2c bus?
16:04 akem i3s dont look so bad on youtube, plate is moving on Z axis only apparently
16:05 akem i wanna get a me creator geetek
16:05 Keukpa the Taz5 look really good
16:07 veverak Keukpa: i3 are good because they got big community/doc
16:07 veverak not because it's good design
16:07 veverak :)
16:09 akem do you use sort of acid bath or spray to smooth surface of objects?
16:10 Keukpa veverak: ah! :)
16:10 Keukpa akem: I've done vapour smoothing but that only works with ABS
16:12 veverak yeah
16:12 veverak but it works nice :)
16:13 Keukpa my favourate printer is my UP Plus, but the only downside is the build volume
16:14 verak likes e3ds construc
16:15 akem keukpa melt surface with vapor heat right?
16:15 Keukpa akem: yeah, put the part in a sealed container, heat up the acetone and the gas vapour smooths the part :)
18:30 orlock rue: you awake?
18:57 fleshtheworld if you made $50 to $100 as extra passive income. what would you be able to do in robotis. along with that, what is holding you back, if anything, is it money, time? I currnetly make $50 to $100 and now want to start investing in robotics
18:58 orlock "invest"
18:59 orlock fleshtheworld: got microcontroller?
18:59 fleshtheworld $50 to $100 daily passive income I mean. i assume, to make the most adcance humanoid, full AI, a working prototype, would cost no more than $300
18:59 fleshtheworld no, i am just starting to learn / work in robotics
18:59 orlock close to calling troll there
19:00 jason__ Go to college
19:01 fleshtheworld invest 'time' in robotics i mean
19:01 fleshtheworld im going to try to build the most advnace humnanoid robot, with a decent AI, in under $1000
19:02 SpeedEvil either trolling, 12, or both.
19:06 fleshtheworld the parts themsleves dont cost much, the AI just needs a little bit of time
19:06 fleshtheworld under $1,000 is still costly
19:07 SpeedEvil In principle, yes, you can probably do decent AI with a modern sub$1K computer
19:07 SpeedEvil neglecting the fact that the structure costs lots.
19:08 SpeedEvil The problem is it may take man-eons of programming effort.
19:10 SpeedEvil It's a field that has had tens of thousands of people working in it for decades.
19:10 SpeedEvil You're not going to be smarter than all of them.
19:31 orlock fleshtheworld: If you have to ask, maybe just start by buying a 3d printer
19:33 orlock fleshtheworld: The software side of things should cost you essentially nothing compared to time, and is by far the harder/more expensive part
19:45 fleshtheworld You mean for building the body frame?
20:15 akem robot version animatronic britney
20:16 akem for christmass