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Glorgnole posted:i'd found the first one but i wasn't sure how well a servo designed for 6V would work at 5V. second one looks pretty ok, only potential issue would be the depth rating, since it'd be a few more meters underwater than IP67 specifies how far down would it have to go?
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Apr 12, 2014 02:19
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01011001 posted:how far down would it have to go? at most 5 meters. the watertight plugs that were supposed to be rated to 10m (IP68) needed some pretty involved modification to not leak at all at depth.
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Apr 12, 2014 02:37
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yeah theres not much in the way of premade waterproof servos that will handle that by default. maybe you can modify that second one in some way like plastidipping it on top of the default o-ringing that it comes with or something? i really dont know offhand what will actually survive being immersed 5m, thats a pretty hard problem
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Apr 12, 2014 02:43
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https://www.youtube.com/watch?v=jV4TmvbH_ow cnc mill is running gonna make something with it this week
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Apr 12, 2014 05:24
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neat. whatcha cutting
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Apr 12, 2014 06:21
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nothing yet one of my stepper motors was defective out of the box and i dont get the new one until monday or so. then it's probably a lot of crude wooden dong shapes to give to friends then car and home projects and stuff idk.
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Apr 12, 2014 06:36
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motor honk is a feature not a bug
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Apr 12, 2014 07:35
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conductivity chat: if you want to make somewhat accurate measurements of conductivity for whatever reason, its really easy to do. youll want 2 electrodes to submerse, held at a constant distance from one another (the specific distance isnt so important, further apart will let you more easily measure highly concentrated solutions. they can be made from something like stainless steel rods. connect one electrode to something like +5V. you can use DC but a sine or square wave at 1-5kHz will keep them from fowling. on the other side, you want a transimpedance amplifier connected to a rectifier if youre not using DC. an IC like an AD536a is great for this, which measures true RMS. you can reasonably calibrate it with nothing but table salt and a scale. use some that doesnt have iodine added if you want it more accurate for whatever reason. if you dont have access to high purity water, tap water put through a brita filter or similar purifier will do. 'pure' water has a conductivity of ~550 nS/cm, or 18.2 MOhms (S for Siemens is the unit of measurement for conductivity, which is simply 1/R) http://sites.chem.colostate.edu/diverdi/all_courses/CRC%20reference%20data/electrical%20conductivity%20of%20aqueous%20solutions.pdf on this chart, find sodium chloride and make one of the solutions of 0.5% or 1%. with that measurement you can determine the cell constant as described here http://en.wikipedia.org/wiki/Conductivity_(electrolytic) under definitions. temperature will change this a bit but if youre not doing something that needs to be well calibrated it doesnt really matter. fun fact: while conductivity is dictated by an ions mobility in an applied electric field, H+/OH- have far higher conductivities than they should because they 'cheat' and carry the charge along the bonds in the water instead of moving
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Apr 12, 2014 09:11
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Panty Saluter posted:huh, i had never thought about this before and it is p. cool. i guess distilled water is a real bad conductor then i love to say dat there is always a small amount of conductivitity because pure h20 equilibirilises with OH- and H3O+ at concentrations of 1x0^-7 mmol each at pH7 heheh thats what pH7 means! lol! hahahahahehehehe Jonny 290 posted:pure water is a dielectric. its the dissolved minerals and such that makes it conductive cool those things are good to know. thanks. until you pointed out anout transistors i thought i thought kirchovs rules were bullshit for captain obvious but it turns out i had mind-arrogance so yeah thanks for teaching me a lesson. i enjoy this stuff
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Apr 12, 2014 11:46
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Stealth Like posted:conductivity chat: if you want to make somewhat accurate measurements of conductivity for whatever reason, its really easy to do. youll want 2 electrodes to submerse, held at a constant distance from one another (the specific distance isnt so important, further apart will let you more easily measure highly concentrated solutions. they can be made from something like stainless steel rods. connect one electrode to something like +5V. you can use DC but a sine or square wave at 1-5kHz will keep them from fowling. on the other side, you want a transimpedance amplifier connected to a rectifier if youre not using DC. an IC like an AD536a is great for this, which measures true RMS. owns
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Apr 12, 2014 11:47
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next project is a thing to tell me if my fermenting beer has had a blowoff. just gonna be an attiny85 hooked up to two probes. if/when a blowoff happens the liquid will close the connection between the probes and the thing will make hella noise.
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Apr 12, 2014 17:39
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see that's the google solution to your problem. you want to strive for the apple solution, which is to do the beer or the fermentation vessel differently so that it doesn't blow off in the first place.
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Apr 12, 2014 18:44
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you can get stainless steel fermenters for several hundred dollars, but idk if anybody makes sealed ones. idk how keeping the co2 around would affect the fermentation.
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Apr 12, 2014 19:39
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just use a blowoff tube with a good size bucket of water, or use a bigger primary, and spend the hundreds of dollars on grain and malt and honey and maybe 5-6 more carboys instead, idk? yospos, help me splice an aux-in into this boombox that apparently turned vintage while it was sitting around in my closet? i don't usually gently caress around with audio levels and amps and poo poo.  i assume for headphone level input, i should patch in right after the pre-amps, and before the tone/volume pots ahead of the main amp, if i want my sweet analog knobs to work? like right after (or before??) R106 & R206?  ideally aux-in would replace tape input, but i dont wanna have to press the big chunky 'play' button to fire up the amp, or need to wire in a tape motor killswitch. will it just go if i feed it a signal like this, or am i missing something? (probably.) need fm, idgaf about am but it looks like the tuner board handles that upstream and it would go thru the pre-amps, so gently caress that, right?  also i'd like to be able to use the deck, at least occasionally... it seems to have some, like, 2600 cart thing labeled 'a - dark side - moon' and 'b - cool beats' inside it. god knows what that thing is
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Apr 13, 2014 11:47
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also if u own a sony CFS-204 heres your service manual, goddamn are old manuals good http://imgur.com/a/lbzNT
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Apr 13, 2014 12:11
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eyah i came to the same conclusion (between those fixed resistors and the volume pot) although if you wanted to mess with it, you could maybe add a DPDT switch in line with those two lines going into the board at the top of the schem from the tuner, and feed through that. that will get you preamplification but idk if it would be too much level prob just go before the volume control
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Apr 13, 2014 14:38
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just use a headphone jack to tape adapter stereo guy:
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Apr 13, 2014 15:11
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if you add that input and you feel like makin some bucks on the side, there's a cottage industry on ebay of people who go to pick-a-part junkyards and get 80s/90s car stereos that just had a tape deck or nothing, then add in a similar aux input and sell it on ebay for $100 or so like this guy: http://www.ebay.com/itm/GMC-Chevy-T...608f5fe&vxp=mtr
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Apr 13, 2014 16:25
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Lathespin.gif posted:just use a blowoff tube with a good size bucket of water, or use a bigger primary, and spend the hundreds of dollars on grain and malt and honey and maybe 5-6 more carboys instead, idk? i switched it over to a blowoff tube, and the primary fermenter is a 6 gallon carboy (5 gallon batch). i'd rather use an airlock if i can get away with it, since a big blowoff bucket takes up a lot of room. this batch blew off because the temp in my apartment was too high, so instead of the fermentation temp being 70-ish it was 76+ degrees right at high krausen and the yeast went apeshit. sparkfun sells a little water detector thing that buzzes when water is detected for like  so i'm just gonna go with that.
Doc Block fucked around with this message at 18:36 on Apr 13, 2014 |
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Apr 13, 2014 18:30
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Corla Plankun posted:just use a headphone jack to tape adapter stereo guy:
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Apr 13, 2014 18:49
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not really my idiot spare time project, but i'm helping out today i made a (bit crooked) tensegrity icosahedron:  https://www.youtube.com/watch?v=pTRVpLzgB-w trying to figure out how to enclose it using aluminized mylar (aka chip bags), don't know what glue will stick the chip bag material to itself and balsa wood... pointers fucked around with this message at 23:44 on Apr 13, 2014 |
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Apr 13, 2014 23:07
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so i got an old gaggia espresso machine for £10 because the boiler had exploded thought it'd be an easy swap job because literally every gaggia semi-auto has the same internals, plus or minus a three-way solenoid or adjustable overpressure valve turns out i got the very last model (1986) before they switched to a taller boiler & the taller one is all that's available any more so there was many hours of loving around to get it to fit & i still need to rebuild the power switch all the same i scrubbed the h*ck out of the internals, replaced all the gaskets, and sawed out the bottom of the portafilter so i could see how lovely my grind/tamp was and it now it makes coffee https://www.youtube.com/watch?v=qBpF5tmjzus e: aww you can't really see the dozen or so gushers squirting off every which way but trust me they're there Usagi-Sauce fucked around with this message at 00:14 on Apr 14, 2014 |
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Apr 14, 2014 00:06
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 Welp, transferred it to the secondary fermenter. No blowoff tube because if it blows off while in secondary fermentation then poo poo is hosed and it's all gonna go down the drain. edit: the foam is just harmless StarSan foam. computer idiot spare time project edit: ordered one of these so i'll be alerted when/if the next batch has a blow off. Doc Block fucked around with this message at 02:06 on Apr 14, 2014 |
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Apr 14, 2014 01:58
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continuing on the theme, I learned some more c# by writing a serial monitor thing. the arduino's running a semi-functional blackjack program. it also understands a few serial commands for debugging. this just does them automatically from a window instead of the terminal in atmel studio.
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Apr 14, 2014 02:22
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Luigi Thirty posted:continuing on the theme, I learned some more c# by writing a serial monitor thing. yuispos
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Apr 14, 2014 05:17
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Bloody posted:yuispos yes it looks like a 1990s ham radio program i am bad at the ui
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Apr 14, 2014 05:41
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Doc Block posted:
starsan owns in a spray bottle if u didnt know already are you using a carboy or a food grade bucket+fittings as a primary? if you use the s-turn type airlocks u can easily fit an overflow tube on it to a spare cider jug or something, in case of blowoff. or just use some decent size vinyl tube and make yr own s shape airlock with board+nails, (or even just duct tape the bitch) and leave a long tail on it and run to the spare bucket or whatever. can save a lot of cleanup if it gets excited
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Apr 14, 2014 09:07
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yeah, i have a spray bottle filled with starsan. also, primary fermenter was a 6 gallon carboy.
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Apr 14, 2014 12:44
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Luigi Thirty posted:yes it looks like a 1990s ham radio program i am bad at the ui i've used worse
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Apr 14, 2014 13:04
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Corla Plankun posted:just use a headphone jack to tape adapter stereo guy: nah gently caress that mang. i aint buying poo poo to mod this thing, let alone one of those so i hooked up a bench pw. supply set to 9v to the battery leads, so i wouldnt be loving around inside it on mains voltage (the 6 c duracells in it said 'best before 2000' and were dead as poo poo but hadnt leaked or fuzzed up  ) cracked that bitch open  and started taking poo poo apart  grabbed a pos mp3 player with 64 whole megabythes of internal storage!!! loaded it up with dethklok and chopped up a 3.5mm cable into some audio test leads, shrinkwrapped its ground braid an tinned some ends and poo poo  powered up the board and started probing around   with new input R and L channels fed into the amp right after r106/206 (and input ground plane tied to the nearby headphone jack ground pad) it blasts dethmetal, overriding any fm or am stations that it might tuned to (or static between freqs, doesnt seem to care AT ALL) and also plays if set on tape mode, AND i hit the PLAY button (although tyes the tape motor runs but who cares unless im running on batteries + just leave it set to radio i guess?? still dunno exactly how the read head circuit energizes the amp, but whatever) awesome, didn't even need to throw a switch between teh tuner input or anything, if the new input is feeding at 5% volume or better and its plugged in it overrides any other audio signals. cant hear any crossfeed from the radio signals at any volume combinations at all once the grounds are tied together but maybe its there idk? if its tuned to 105.3 fm or whatever and i unplug the feed it instantly goes back to the radio. the input level seems a bit high, as in it's maxing the speakers at probably ~50% at the most on teh volume knob, with maybe 75% volume on the rio sport s30s and after switching back to fm i'd probably want to crank it up i guess, so maybe i should be on the other side of the 10k's at r106/206? but the volume and tone knobs work and scale nicely so...??? unless backfeeding the preamp and tuner circuits longterm is somehow gonna cause my boombox to burst into flames i don't really care, it worked great for 2-3 hours tonight so i'm calling calling Project Shop Radio Mk. ~7 a success  great, now grab an old pci soundcard or Creative™ SoundBlasterTM remote cable dingus pcb or some poo poo for a 3.5mm socket (save the usb socket in case you decide to wire a 7805 usb phone charger circuit into the boombox )  introduce that poor bitch of a pcb to a bandsaw, clean up edges with grinder/file and check for shorts/pinout (or just buy one from ratshack or mouser or whatevs if yr a scrub)  cleanup yr board wiring/routing, add some hotglue strain reliefs  reinstall main and sub boards, locate position of new AUX socket, drill hole and hotglue that sucker in   gold-plate bitchesss  plug in patch cable and re-check , finish reassembling tape mechanism/faceplate including reclocking radio tuner mechanical gauge, whoops! (tip: tune board gear hard clockwise, slide gauge indicator rack to indicated ~108fm, installation is reverse of removal, etc, etc)  close that bitch back up, plug in the mains lead, fire up murmaider and go start shoppin ni-mh C cells on amazon/ebay, gently caress yeah. also i was wrong, tape side a is labeled as *soft beat* 
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Apr 14, 2014 13:14
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Lathespin.gif posted:nah gently caress that mang. i aint buying poo poo to mod this thing, let alone one of those that is awesome
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Apr 14, 2014 14:01
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lolllll ~*side a: soft beat*~ track 1: orbital - halcyon on and on
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Apr 14, 2014 15:42
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even more proof that the 90s were great, imo
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Apr 14, 2014 15:43
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...also hackers owns
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Apr 14, 2014 15:47
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Lathespin.gif posted:lolllll ~*side a: soft beat*~ track 1: orbital - halcyon on and on futurewife was watching a movie and this song came on during the fade to credits wrap and i was like 'oh man i loving love this song'
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Apr 14, 2014 16:04
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new stepper motor came in so i made a crude penis drawing using arrow keys to jog cnc mill, gonna try setting up some actual programs tomorrow probably
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Apr 15, 2014 05:31
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made a pretty fast markov chain library in cpp, then more recently got around to making a python+beautifulsoup wrapper to fetch and insert sa threads here's the first few lines i got for this thread: quote:and then do it for years and that's what is the best: adlib gold 1000 (didn't bother having the fetcher be logged in while fetching so swearing is filtered out  )
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Apr 15, 2014 07:26
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i took two things i wanted to play around with and smashed them together tweetakeet: the markov chain twitter bot https://twitter.com/tweetakeet i use the bot's feed as an input (so i can whitelist people by following them) and anyone who mentions the bot will get a generated tweet shot back at them. still need to do some error handling, it isn't smart at all about tweet length so it just fails silently sometimes. once i get that sorted out i want to build a gui that lets you view the different chain nodes and play with probabilities. idk it kept me interested for a little bit.
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Apr 16, 2014 03:41
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i know someone literally called me "the fishmech of chrome extensions" so lol, but this is the first and last post ill make about this https://chrome.google.com/webstore/detail/webmbed/gfbfkmmaicfmegknnopfbdgjbbeijkmn i figured it would be handy to somebody to have webm stuff inline anywhere.
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Apr 16, 2014 04:15
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i thought you could only post in project.log
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Apr 16, 2014 05:19
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