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Mad Scientist

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Everything posted by Mad Scientist

  1. I'll never live long enough to follow all the way through on every idea I have so here's one I hope to see Implemented one day: The junction of Kanthal and nichrome is a thermocouple. No need for separate thermocouple of low thermal mass. At vape temps it will produce several milliviolts with a room temp cold junction. I'd envision a coil with a welded junction of the two wires Ian roughly midpoint. Their gauges would have to be selected for equal resistance per unit of length. Might just work
  2. I just go with numbers for the clipper shields. #2 is fast and simple. And I never have to comb my hair lol.
  3. Although a single 18650 would be great for "the small mod" there are some small 2S and 3S lipos that come pretty close. If you want a really teeny tiny mod, the DNA 200 might not be the best platform to start with. Get or build a DNA 200 mod to develop and analyze your best coiling and wicking technique, then also have another teeny tiny mod for the suit pocket. As another approach, there are some 18350s where a pair would allow you to go up to about 40 Watts. My understanding is there is some way to set a somewhat permanent limit on the DNA 200 so it wouldn't allow going above a defined power level.
  4. Well, I think I solved my own problem another way. I plan to make 3S packs using 18650s with a balance connector and polarized output connector on each pack. No user error really possible.. The 18650s are supposed to be kept together for life anyway. Might as well make it a marriage without possibility of divorce lol.
  5. You're way ahead of me. Let us know when you've got it perfected. Sounds great! In the mean time, maybe just a diode & easily replaceable fuse to crowbar the pack. I guess the cell taps would still be an issue?
  6. High current low Rds(on) FETs are apparently now cheap enough to use as reverse battery protection. Here's a simple circuit that at first glance looks like it will do the job: http://www.ti.com/lit/an/slva139/slva139.pdf I haven't yet selected an appropriate FET for this application so if anyone has suggestions, that will save us all a lot of time. It has been a while so I'm not up to date on what all is out there anymore. Cheers.
  7. I know this is a dumb question, but for the balance connector, the drawings seem to show the "slot" down (farther from the USB) but the photos show the "slot" up (closer to the USB). Am I missing something? My eyesight isn't what it once was so maybe the connector is marked somewhere but anyway, which way does it go? Thanks.
  8. Yes, I get that, but what is the latency of each GET transaction? So in your explanation above, what is the timing of the "wait for response"? I.e. how long is this wait? Would it be practical to obtain real time data for plots through this CLI or is it too slow? If it's too slow, can we get specs on the fast interface? I'm trying to come up with a "least pain" way to implement a wireless link between the DNA and the PC. If the CLI is fast enough to get the data out of the DNA for plots, that would seem to be perfect. As a seat of the pants guess, I'd anticipate wanting to obtain at least 30 data points per second allowing for 3 data types at 10 interleaved points per second each (like temp, power, resistance or along those lines). Is that like way slower than the thing can spit out the data or would I be bumping up against limitations of the DNA CLI's ability to parse the command, get the data and send it? Thanks very much for your help!
  9. Fantastic, thank you! Any info on timing? I'm assuming it's all "as fast as it can" but are there more than incidental timing considerations for performing, for example, a quick succession of T=GET transactions to make a temp plot?
  10. I really want a way to go wireless as well. I just haven't found anything easy (small dongle).[/QUOTE] There are a boatload of chips and hybrids available. Years ago I did a temperature telemetry project using radios from a now defunct supplier. The radios were about half the size of a thumbnail. An eight pin PIC and DS1820 and the whole shebang was less than a cubic centimeter, not including battery. I haven't worked with any of the new crop of stuff yet but surveying what's out there, they have hybrids with the radio chip including an ARM core. Basically single chip radio and processor with a few discretes. Very tiny. Once I select the parts and get something working, I'll post back with what worked. There's a lot out there, really amazing stuff. Maybe make the DNA 200 it's own IoT WiFi web enabled mod lol. I wished for plug and play but there seems to be nothing available.
  11. I'd also be very interested in the interface specs. I really want a wireless interface between the PC and the DNA. I can do a wireless serial interface. Hopefully for this it's a couple of USB to serial converters, a couple of PICS and the radios? Is all the data communication CLI?
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