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  1. E

    BBS-FW: Open Source Firmware for BBSHD/BBS02 Controller

    in the instruction ther's written to set mcu to 20 mhz and that it's a bit unstable at the end but I saw in many procedures that the frequency is 18.432mhz. Could it be that the higher frequency causes the instability?
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    BBS-FW: Open Source Firmware for BBSHD/BBS02 Controller

    looking better, I've seen that these mcu hadn't thr ability to extract the firmware. The issue is not about protection but a design of the microcontroller that by default does not allow the memory to be displayed. So the only way is to flash the firmware if there's one. i saw those firmware...
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    BBS-FW: Open Source Firmware for BBSHD/BBS02 Controller

    two questions: to communicate with the display, are the command bytes in the original FW the same in this FW? Is there a way to backup original firmware before flashing?
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    Cycle life tests of High Energy density cylindrical cells

    can you try eve 26v? They are inside some xiaomi scooter battery packs
  5. E

    TSDZ2 EBike wireless standard (like Specialized Turbo Levo) - OpenSource

    When tsdz2_vin is positive, bts4140n is on? Bts4140n enables bsp296, right? Is P1.00 positive?
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    TSDZ2 EBike wireless standard (like Specialized Turbo Levo) - OpenSource

    Hello I see in the project a power switch and a transistor for the wireless controller. what are they for?
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    TSDZ2 EBike wireless standard (like Specialized Turbo Levo) - OpenSource

    for reference only this devices has also lev Garmin edge 520 plus edge 530 edge 820 edge 830 edge 1030 edge 1030 plus edge explore edge explore 1000 edge touring plus o-synce usee coachsmart lev Selfloops Android ANT+ sigma sport rox 12.0 sport wahoo elemnt roam
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    TSDZ2 EBike wireless standard (like Specialized Turbo Levo) - OpenSource

    For reference here there is the difference between various nrf52. i was looking for cheaper one but cheaper means less functions. https://infocenter.nordicsemi.com/index.jsp?topic=%2Fstruct_nrf52%2Fstruct%2Fnrf52.html
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    TSDZ2 EBike wireless standard (like Specialized Turbo Levo) - OpenSource

    Nice. Simple and easy. If I can suggest you can put + and - near the variable to change it or a slider or choose it with the keyboard. There are many options to choose. Further in the development a vertical slider on the right (or on the left for left-handed) in the main screen to change the...
  10. E

    Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app

    There's runtastic
  11. E

    opensource 3d printable electronic shifting?

    For the stepper motor driver I suggest drv8825 it's cheap, 80 cents.
  12. E

    opensource 3d printable electronic shifting?

    Good idea. For now I'm looking for buying the joint and the thrust bearing, it could be useful to buy different stepper motor to verify the limit of the torque required. This varies also from the friction of the shaft. The friction is not also the same. Example bronze threaded rod has lower...
  13. E

    TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

    Let me suggest to buy a dc dc boost, it's cheaper
  14. E

    opensource 3d printable electronic shifting?

    not the full travel but only to change a gear (or also two gears,), pull 5 mm of the cable to change the gear with a sram or the half for shimano. It is sufficient to see the weight to pull from the second to the first gear. It's the hardest to pull. Obviously with the chain not without it...
  15. E

    opensource 3d printable electronic shifting?

    The problem is this: to change the gear in a certain amount of time there's a need to have a fixed power. If you have a motor with 1000rpm with a gear 10:1 that changes the gear in a second, it will consume the same power of a motor with 100rpm and changes. The gear in a second. So there are...
  16. E

    opensource 3d printable electronic shifting?

    For now I'm searching a stepper motor that has a constant torque curve, not less than 8 N.cm Nema8 is a bad choice because it has 4 N.cm. Too low. I'm asking if someone has a balance to measure how many kg are needed to change the gear pulling the cable... I apologized 5 kg but I'm not sure.
  17. E

    opensource 3d printable electronic shifting?

    I practically thought of two projects: a linear servo as we have already seen or a motor with a screw that turns a round gear and you can also print this in 3d. It's more compact but fragile. If you think about the compactness you have to say that there are also disadvantages. I would prefer a...
  18. E

    opensource 3d printable electronic shifting?

    I'm curious to see a stepper motor directly in a sram derailleur Anyway a nema stepper motor has enough torque. I read that some linear slide has only a force of 500gr at 360rpm. Maybe is not enough
  19. E

    opensource 3d printable electronic shifting?

    If you search stepper motor slider you find something cheap and almost ready to use
  20. E

    opensource 3d printable electronic shifting?

    Take in consideration that sram pulls more cable, shimano less. Minimum 2 cm maximum 5cm depends from the number of the gears and if it's a shimano or sram derailleur. Or a less known mark.
  21. E

    Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app

    inclination sensor in a front suspended bike and worse in a full suspended is so so, in a road bike you can put it everywhere. Prons is a fast response, cons is sensible in a rough terrain. A road with a 10% gradient has only 6 degrees of inclination, 5% 3 degrees. Barometer is less sensitive in...
  22. E

    Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app

    It was nothing.just a little contribute :)
  23. E

    opensource 3d printable electronic shifting?

    I see this calculator: https://daycounter.com/Calculators/Lead-Screw-Force-Torque-Calculator.phtml. maybe it's ok that servo. I think that the for safety reason is better to let the original shifter and the cable and put between the derailleur and the shifter a linear servo. cutting a piece of...
  24. E

    Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app

    Open source e-shifter is not a problem, I saw many times ago some projects with arduino.
  25. E

    Bafang SW102 Bluetooth LCD - OpenSource firmware and mobile app

    I like the original controller but if there's a better alternative...
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