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esaj

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esaj last won the day on July 12

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About esaj

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  1. Headache

    No time to write an actual post, so I'll just put up some pictures: 3d-printed motor brackets: Went surprisingly well, no issues with the printing, making 10 copies was pretty easy. Last IR-LED/IR-photodiode -modules (35 needed for 5 robots, in total I made 39 of these I think): Brackets and the boards with SMD ICs in place: First complete board, rest with all the SMDs (ie. resistors and caps in addition to ICs) waiting for through-hole -assembly: Completed boards, unassembled extra boards on the right-side (it was the same price for 5 pieces or 10, so I took 10, just to have spares in case I f**k up badly, plus the design can be used for other kinds of stuff too, with certain limits of course): Factory-made boards are much faster and easier to solder compared to milled boards. Definitely will order more when I have a project again that needs more than something like 1-3 boards, of course depending on size & time, but still prefer to at least prototype with milled boards first to verify the design to avoid ordering boards that have design faults to begin with Fleet ready for programming:
  2. Music?

    Everyone was surprised when HIM announced their farewell-tour this year... everyone in Finland was surprised that HIM still existed. They were "big" here somewhere around the turn of the millenia, I think, but since then they've mostly been popular abroad. EDIT: Reminded me of this: Apocalyptica + Lauri Ylönen (The Rasmus) + Ville Valo (HIM)
  3. Two videos from my flight sim endeavour

    I played F/A-18 Hornet 2.0 a lot somewhere in the middle-90's as a kid... all I remember is that it took ages to learn to take off from & land on an aircraft carrier. And the amount of keys & key-combinations was huge, since I only had a single joystick without that many buttons and no pedals or throttle-stick, so I had to fly with stick + keyboard.
  4. Gotway Tesla vs KS16S?

    Ground fault current interruptor is not a fuse, it measures the outgoing and returning current, and if there's too big of a difference (like 10-30mA), it interrupts the circuit, because current is "leaking" to ground/earth somewhere (usually something has shorted to ground/earth). The current limit is small, because the short might be caused by a person, and 10-30mA is low enough not to kill (usually). But it won't work as a fuse, ie. it won't cut the circuit based on the total amount of current, but small amount of "missing" current. Someone might wonder why they won't cut even at lower missing current, but many house appliances "leak" a small bit of current to earth, and some devices do this by design via a resistor going to ground/earth (I must admit that I don't know why though). That said, there ARE resettable fuses (called "automatic fuses" here, automaattisulake in Finnish, GFCI's are "vikavirtasuoja" in Finnish), but they usually don't have very large current carrying capabitilities, at least the ones I've seen have usually been made for 110/230V (RMS) mains, something like 10 or 16A, and they're fairly large as they're meant to be installed in a mains cabinet DIN-rail: There might be physically smaller-sized, higher current limit versions of automatic fuses too, but a wheel can draw very high transient current for short while during take off or acceleration (tens or even a hundred amperes for high power models?), and they might cut the power when it wasn't really supposed to KS uses 30A or 40A blade-fuses on the board where the battery wires come in (separate per battery pack for the KS16S, so 80A total basically), although I guess most of the transient peak current is delivered by the capacitors on the board and not drawn (as much) from the batteries themselves. At one point I was considering PTC-fuses (Positive Temperature Coefficient, the kind of polymer-fuse that cuts the power once it overheats from too high current and then resets after it cools down) for something I was planning to stick to my wheel, but SMD-versions of those have usually a voltage limit of up to 60V, above which they might not work (ie. they might not cut the power when they're supposed to), some THTs go up to 72V.
  5. Anyone notice this weird psychic phenomenon?

    Nice try, but she actually called yesterday that she's coming over with my uncle today
  6. Ever Buy Stuff That You Probably Don't Even Need?

    Sorry to burst your bubble, but the Blackberry's aren't done by Research In Motion anymore, AFAIK they sold (or licensed?) the rights to the Blackberry -trademark and the current phones are made by some Chinese manufacturer (TCL Communication). BlackBerry is a line of smartphones, tablets, and services originally designed and marketed by Canadian company BlackBerry Limited (formerly known as Research In Motion Limited).[1] These are currently designed, manufactured, and marketed by TCL Communication (BlackBerry Mobile), BB Merah Putih, and Optiemus for the global, Indonesian, and Indian markets, respectively, continuously using the BlackBerry brand. I think I might actually use a smartphone with a QWERTY-keyboard, BB Priv looks nice (although it's already couple of years old), the keyboard slides out from under the phone: Most of the other Android Blackberry-models with keyboards seem to have more squarish display, which I wouldn't mind, but I'm pretty sure the aspect ratio's going to cause problems with lots of software, because the user interfaces weren't written for such aspect ratios (because they're rare), and people will likely hit problems like some of the buttons or whatever partially outside the screen... "Joys" of making mobile software
  7. Music?

    Ayreon released a new album, "The Source" this year: The man (Arjen Lucassen) behind the music, lyrics & storyline actually published the entire album in Youtube with in-depth behind the scenes notes and animations, but this is just one song. The singer line-up for this album is: James LaBrie (Dream Theater) as The Historian Tommy Karevik (Kamelot, Seventh Wonder) as The Opposition Leader Tommy Rogers (Between the Buried and Me) as The Chemist Simone Simons (Epica) as The Counselor Nils K. Rue (Pagan's Mind) as The Prophet Tobias Sammet (Edguy, Avantasia) as The Captain Hansi Kürsch (Blind Guardian) as The Astronomer Mike Mills (Toehider) as TH-1 Russell Allen (Symphony X) as The President Michael Eriksen (Circus Maximus) as The Diplomat Floor Jansen (Nightwish, ex-After Forever, ex-ReVamp) as The Biologist Will Shaw (Heir Apparent), Wilmer Waarbroek, Jan Willem Ketelaars, and Lisette van den Berg (Scarlet Stories) as The Ship's Crew[citation needed] Zaher Zorgati (Myrath) as The Preacher1 Also guest starring Joost van den Broek (ex-After Forever) – grand piano and electric piano Mark Kelly (Marillion) – synthesizer solo[13] on "The Dream Dissolves" Maaike Peterse (Kingfisher Sky) – cello Paul Gilbert (Mr. Big, Racer X) – guitar solo[14] on "Star of Sirrah" Guthrie Govan (The Aristocrats, ex-Asia) – guitar solo[15] on "Planet Y Is Alive!" Marcel Coenen (Sun Caged) – guitar solo[16] on "The Dream Dissolves" Ed Warby – drums Ben Mathot – violin Jeroen Goossens (ex-Pater Moeskroen) – flute, wind instruments Arjen Anthony Lucassen – electric and acoustic guitars, bass guitar, mandolin, synthesizers, Hammond, Solina Strings, all other instruments The album happens in the main Ayreon-storyline, after the Big Bang (Dawn of a Million Souls / Flight of the Universal Migrator), right before the 01011001 -album, telling the story of how the Forever-race came to be... the entire storyline is far too complex to explain, and I'd just get things wrong, plus it's music, so it can be listened "just" as such Here's a glimpse of the entire timeline, although pretty vague in my opinion
  8. Anyone notice this weird psychic phenomenon?

    I'm still waiting for the lottery numbers... or if you can tell for certain whether Bitcoin (or some other cryptocurrency) keeps on going up for the next, say, 3-5 years, so I can go all in
  9. Yes, it will definitely burn with 30V, likely also with 9V. The datasheet for the ATMega328(P) at http://www.atmel.com/Images/Atmel-42735-8-bit-AVR-Microcontroller-ATmega328-328P_Datasheet.pdf states under absolute maximums: Voltage on any Pin except RESET with respect to Ground -0.5V to VCC+0.5V And the absolute maximum for the supply voltage (VCC) for the chip itself is 6V. Usually Arduinos are powered with 5V, which means the analog input (or any other) pins should never be subjected to voltages below -0.5V or above 5.5V (in reference to the GND of the Arduino). Another thing I noticed on a quick glance under the ADC-chapter: The ADC is optimized for analog signals with an output impedance of approximately 10K ohm or less. If such a source is used, the sampling time will be negligible. If a source with higher impedance is used, the sampling time will depend on how long time the source needs to charge the S/H capacitor, with can vary widely. The user is recommended to only use low impedance sources with slowly varying signals, since this minimizes the required charge transfer to the S/H capacitor. (S/H refers to "Sample & Hold" -circuitry inside the ADC, aka Analog-to-Digital-Converter) Basically what it's saying is that if you have a higher than 10K resistor on the high-side of your divider, you must use a longer sample time (or maybe the chip is smart enough to adjust itself, didn't read that far ). Personally, I'd probably stick some rail-to-rail -opamp there as a buffer.
  10. You can now add "universal translator" in your sig
  11. Yes, that's the general idea. Since the voltages are (or at least should be) divided to some "suitable" (0...up to 5V, unless you use lower VREF-input on the Arduino) voltage area, nothing more complicated should be needed... well, I'd at least add something like 5.1V (or whatever is slightly above or at the VREF-level) zener- or TVS-diodes to shunt out any high voltage spikes that might damage the ADC, but that's just me Multiple consequent readings & averaging (and/or low-pass software filtering) in software could be used to further get rid of any glitches / noise in the signal, but I guess there's not that much noise in the cells themselves (but if you have long wires going to the measurement circuit, they might pick up all sorts of noise from the environment, like the motor).
  12. MIA Forum Members Where Are They Now?

    That reminds me, guess who's supposed to (by Christmas "preferably") fit all this: (Well, "just" the 3d-printer, and the four table tops + cabinets) into this: Guess I'll have to throw away most of the old tables...
  13. Electric Unicycle Terminology

    Ok, this post was near to 2 years old. Updated some stuff that has changed since: -Only mentioned 16-cell series as common battery configuration, nowadays 20S is also very (if not even more) common -Stroke out the warnings about BMS cut-outs, these seem to be a thing of the past, now we deal with melting wires, broken gyros and whatnot... -Ninebot was the only one offering "over-the-air" -firmware upgrades at the time, now most mainstream manufacturers have those -Hall-sensor based current measurement seems to be more common place than plain current sensing resistors nowadays -Suggestion of minimum of 500W+ motor for heavy riders updated to 800W+ -Mention that modern wheels usually have separate inner- and outer-shells -Firmware-based power cut on overspeed seems to be a thing of the past, overleans/overpowering still exists, as well as burning boards -Removed the link to BMS shunting, anyone buying something newer than late 2015/early 2016 wheels shouldn't need to do this anymore? Do note me if that's not the case -Added "MOSFET" in technical terms, as it comes up every so often -Redefined "overspeed", somewhat -Clarifications of some terms, other minor fixes Anyone know of other terms that should be added?
  14. MIA Forum Members Where Are They Now?

    Also, some recognize their addiction to the forums and wean themselves out more or less forcefully... like @hobby16
  15. SML-160 The old Lady

    I think this is it: http://www.ewheels.org/catalog/single-wheels Behold the IPS Makalue: F-Wheel Beetle: F-Wheel Red Rabbit: And others, like Gotway MSuper V1(Umm, nope, the catalog's partially updated, it says 2015, V2 came out already sometime in late summer or autumn of 2014) and first MCM, M0, M5, M10...
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