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  1. cycborg

    Nucular electronics - complete kit for ev!

    On the Wiki page for the LEVCAN, there's this tidbit: Is this implemented? Which quantities are logged, and what is the logging frequency? One thing that frustrates me about the FOC controllers that I've worked with (PhaseRunner, Sabvoton) is that I know they're continuously collecting all...
  2. cycborg

    Nucular electronics - complete kit for ev!

    Wow, so much wrong in so few words. Talking out of your ass is fun until someone's heart goes into vfib.
  3. cycborg

    bluetooth BMS?

    So... are you writing your own software?
  4. cycborg

    bluetooth BMS?

    Do you mean number 5? It's groups 1-5 that failed. Regardless, what's the mechanism that causes this cascade? I think the management IC is the TI BQ76940, which is for up to 15s. These 15 are split into 3 blocks of 5, so it's plausible that a whole block failed somehow. Now to figure out the how.
  5. cycborg

    bluetooth BMS?

    But could this result in the failure cascading through 5 groups?
  6. cycborg

    bluetooth BMS?

    Yep, I scratched through the Kapton and measured across 1-5 on the electrodes. Dead, dead, dead. Balance wires (and their solder connection to the electrodes) look intact. Thanks for the suggestion, though.
  7. cycborg

    AliExpress battery pack unboxing (for my eZuma project)

    "One for all" is... a single pulse per revolution? Per phase cycle? I assume the first two are the usual connections direct from the motor, and "communication" is some unspecified UART/CAN/MODBUS/whatever interface. Wonder what "error type" could possibly be?
  8. cycborg

    bluetooth BMS?

    Frustrating mystery from this weekend. Bottom line, 5/14ths of my pack is dead, and I don't know what it could be other than some BMS malfunction, although I haven't pinned it down. BMS is this one, 14s 30 A. I hadn't used my ebike in a couple months, although I connected via Bluetooth once per...
  9. cycborg

    Sabvoton SVMC072150 controller review, variable regen *PICS*

    I'm using an SSC 72150 with a 14s battery and a QS 273 scooter hub motor. I'm really happy with my regen setup - enough slide regen to feel like engine braking on a gas bike, plus variable regen on a left-hand throttle. This has the feel I want and I almost never need to engage the mechanical...
  10. cycborg

    Nucular electronics - complete kit for ev!

    I think you're talking about charging directly from a PSU. The discussion is about charging through the controller. The PSU voltage needs to be well below the battery's discharge voltage. For 14s, you'd be safe with a 24 V PSU. 36 V would be pushing it. 54 V is much too high. Even if you could...
  11. cycborg

    Nucular electronics - complete kit for ev!

    As I understand it, the controller has exactly this function. I don't know if there is a limit to how much it can boost, though.
  12. cycborg

    DC to DC converter have 3 wires for 48V+

    You're on the right track. The converter has large capacitors at its input to smooth the power flow. If the unit has been disconnected and the caps are discharged, then the next time you connect it there will be a large inrush of current as the capacitors charge. If you do this by connecting a...
  13. cycborg

    DC to DC converter have 3 wires for 48V+

    If the controller is connected to the battery, and there is no "enable" line, then twisting the throttle (which is powered by the controller) will cause the scooter to go, regardless of whether the scooter is "on". How are the outside wires connected to the inside wires? Is it red-red...
  14. cycborg

    DC to DC converter have 3 wires for 48V+

    Not a lot to go on here, but my guess is that the yellow wire is switched by the ignition to activate the converter. Some controllers (Sabvoton, ASI BAC) have low-current battery-level inputs to enable the controller, so that's probably what the red is. This prevents operation of the vehicle...
  15. cycborg

    Help me develop the perfect throttle

    Bi-directional for regen
  16. cycborg

    Phaserunner TTL to USB converter : RS232 to TRS

    The pinout is on pages 9-10 of the chip data sheet, so you could check continuity between the pins on the chip and the wire terminals. Looks like it's pins 12, 13, 15, and 20 for D+, D-, 5V, and ground, respectively. Where are you located? I found this on Amazon in the US and I could have it...
  17. cycborg

    Sabvoton software unlock?

    Here's something you can try. I haven't done it myself.
  18. cycborg

    Sabvoton SVMC072150 controller review, variable regen *PICS*

    I'm looking for advice on getting the (non-variable) regen to work. I'd like to set up two levels of braking, with weaker "slide" regen when I release the throttle, and stronger "electric brake" regen when I grab the brake lever. I have slide regen working fine, but electric brake is having no...
  19. cycborg

    bluetooth BMS?

    Other than the issue with proprietary bluetooth described above, I've been happy with them, although I've only had them installed for a week and a half. The 100 A one has not yet been on a vehicle, just monitoring and charging the battery, but I also have a 30 A version that I've installed on my...
  20. cycborg

    bluetooth BMS?

    I'm using the one pictured below from LLT Power (purchased via the JBD Store). I think the problem is that these are shipped with a proprietary BT module that only interfaces with the "official" Xiaoxiang app. This post indicates that these BMSs were previously shipped with generic BT modules...
  21. cycborg

    bluetooth BMS?

    I'm trying to use VBMS on Android. Is that what you're talking about?
  22. cycborg

    bluetooth BMS?

    Maybe this is one reason why the app isn't on the app store and must be installed from the APK. Anyway, no one else has my issue of not being able to pair the device via the system BT settings?
  23. cycborg

    bluetooth BMS?

    Thanks for the reply. So you haven't seen the behavior I've described?
  24. cycborg

    bluetooth BMS?

    I'm able to use the Xiaoxiang bluetooth app on Android with no problems, but not VBMS. I get the message "Auto Connect - Attempting to connect to the BMS" with a spinning indicator that just stays up until I hit the back button. Then I get a list of paired devices with a "Scan new device" button...
  25. cycborg

    bluetooth BMS?

    Argh, after two days of this, the BMS spontaneously started alternating between even and odd groups for no reason that I can determine. If anyone else runs in to this, I can't tell you what to do about it, all I can say is there's hope :? Edit: My guess is that the alternation was triggered...
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