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artifus

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artifus last won the day on September 20 2012

artifus had the most liked content!

About artifus

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    life, the universe and everything.
  1. artifus

    RGB Globe

    how about mounting such a project in an up turned fish bowl like white opaque globe so that the image was (diffusely) projected onto its inner surface? if you could get the distance/intensity/focus right... smoke filled clear globe maybe? what if the globe were an opaque balloon kept inflated by the smoke? kinda like a plasma globe...
  2. artifus

    2-osc PWM Midi Synth

    quite possibly - i wasn't 100% on the dco calib having worked tho it seemed to pass the test... i'll check it out when i next break out the breadboard for some tinker time. i assumed the resistor value was due to the msp's 3.3v rather than midi spec'd 5v. but as i say it works, which is good enough for me. much fun thru lunetta style cmos circuits: http://electro-music.com/forum/forum-160.html
  3. artifus

    2-osc PWM Midi Synth

    code link is borked. i agree it's weird but it worked - i've no idea why. tried various resistor values (from 10r to 10k) at the time, with and without the led after replacing the dodgy midi cable, and settled on 1k47r with led for the best response. yes, it's a 2231. it's not an issue - i'm just curious. *edit* forgot to mention - i said above that i had no problems without the opto but this was only true if powering the midi keyboard from usb, as was the msp - sharing ground from the one laptop i presume. all sorts of erratic behaviour if keyboard was powered from it's own psu. no such probs with opto. hope that all makes sense and helps - need sleep.
  4. artifus

    2-osc PWM Midi Synth

    hi rob - i hoped you'd chip in. either you have misunderstood my post or i am misunderstanding your response. 4n35 is all that was available. i found a work around. it worked. your schematic closely resembles my described solution. i don't understand what it is that you are recommending. please forgive my slowness.
  5. artifus

    2-osc PWM Midi Synth

    nice work! will be keeping an eye on this one. had a play with naturetm's simple synth a while ago - much fun. http://naturetm.com/?p=111 you mention stuck notes on your blog - i had some midi communication problems when i added an opto isolator, no problems at all without it, but also wanted to stick to midi spec: http://www.midi.org/...electrispec.php which is kinda vague, not for 3.3v and i couldn't source a 6n138 or pc900 so only had a 4n35 available. once i added the opto i had all sorts of problems, erratic response, stuck notes, etc. requiring frequent resets. i fiddled with resistor values on the msp side which improved it somewhat but with still the occasional glitch. adding an led on the midi side has cured it with flawless response and no stuck notes but i've no idea as to why - if anyone can explain it would be appreciated. i had been using the led to check for midi output as here: http://www.alfors.co...estKonektor.jpg and here: http://www.epanorama...s/miditest.html due to an intermittent fault in my midi cable and stumbled upon this 'solution' by accident. anyways, here's what i ended up with (note that the 1k resistor should be 1k47): i used two resistors, 1k and 47ohms in series, on the msp side. might be worth playing with. i look forward to trying out your code. other links i stumbled upon when trouble shooting: http://blog.gg8.se/w..._side_of_things http://www.gammon.co...connections.png
  6. artifus

    How would you use sensors to detect snow?

    i would also consider the texture of your rubber carpet tiles - you'd want some sort of positive physical feedback under foot through a thick winter shoe sole before committing full body weight to a step if you were unsure as to whether the way was clear, particularly if vision were a problem... perhaps the heating element could be a sturdy raised metal grid of some sort? thinking cattle grid, not sure why... just thinking out loud again. *edit* hmmm... if weight were decided upon as the means of detection maybe the floating grid heating element should be employed as detector as rain could collect and apply mass to the rubber mat below but not the floating grid? could this be combined with the hot wire suggestion?
  7. artifus

    Help me pick linux flavor

    *ups nerd cred from 0 to 1*
  8. artifus

    Help me pick linux flavor

    @all: explain it to me like i'm five. why do you like what you like about your choice of linux and how did you find the installation and learning curve experience/period of adjustment from a windows user/linux noob perspective? @mbeals: i'm curious as to why you never settle on puppy yet use it. i ask because i use it in a similar way - it has been my most positive linux experience to date yet i find myself reluctant to settle on it and am still looking for a more day to day, permanent alternative. i think i may have commitment issues.
  9. artifus

    How would you use sensors to detect snow?

    maybe. would depend on the expected environmental conditions and set up, i guess, some of which may be controlled, some not. i think i imagined a relatively large surface area, at least a foot by a foot, say, where from 'mass readings' could be taken periodically and averaged over an hour or so and compared to a current mass and temperature reading maybe. would be less power consumption than applying constant heat. once it was decided that heat may need to be generated (to melt the snow) other methods as suggested above could be employed too. t'was just an idea. *edit* in fact i imagined an umbrella at first - why isn't a simple and robust umbrella style construction (no micro required) used to protect traffic lights from the elements? it would sit above the lights which are generally viewed from below. or have i, once again, missed an important point or three? anyways, an umbrella like structure would allow rain to flow off and snow to collect, adding weight which could be measured at the central pivot.
  10. artifus

    Help me pick linux flavor

    not so much words of wisdom as my own noob and superficial linux experiences. always wanted to like ubuntu but have rarely got on with it, mainly due to older esoteric hardware issues but also as i'm always nervy of distros touching my hard drive and/or messing with the mbr as i'm quite happy with my current windows installation. i like to run from a separate usb drive without a grub on the internal. have recently been playing with the latest ubuntu with a little more success due to hardware upgrade but know where you are coming from with the bloated comment. i quite like puppy: http://www.murga-linux.com/puppy/viewtopic.php?t=70855 as a noob can mess with it without fear of buggering up the entire installation or pooter as you boot into and run from ram, referencing a save file for system changes. have considered remastering a small and portable msp430/microcontroller ready iso but have yet to find the time. maybe try a few different distros on for size: http://www.linuxliveusb.com/en/supported-linuxes will be following this thread with interest as i'd like to explore linux further and become more comfortable with it.
  11. artifus

    How would you use sensors to detect snow?

    another approach could be to detect weight as snow sticks and builds up on a slanted surface that liquids would run off. maybe hack some cheap digital scales and combine with temperature sensing?
  12. artifus

    microphone input

    stumbled upon and bookmarked this a while ago: http://www.tau.ac.il/~stoledo/lego/msp430-perfect-pitch/ it listens for and detects just one specific frequency. may be of interest.
  13. artifus

    microphone input

    the limit is dc. you don't need to go below 20hz for audio and your mic probably starts to cut off beyond 12khz ish in the upper realm, not that you'd need anything above 2k for a bang anyway. http://sim.okawa-denshi.jp/en/Fkeisan.htm
  14. artifus

    microphone input

    1k should be fine - you just bias for the least distortion/noise but should still get signal. if your cap was too small then not a lot of signal beyond the mics frequency response would get through, if any - the bigger the better for boom.
  15. artifus

    microphone input

    possibly. what are you using? r1 is to bias the fet in the mic and c1 is dc blocking - the smaller its value the less bass is allowed through, you want at least 1uf for a bang detector probably closer to 10uf.
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