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Recent content by quaddamage

  1. quaddamage

    Fly while powered by cable

    There are SMD 5A diodes, so the cap would probably still be more noticeable. If the capabilities of the smaller board turn out to be a lie, then two such boards could be added - would still weigh less than one larger. Then the diodes would also help in merging outputs (though most likely there...
  2. quaddamage

    Fly while powered by cable

    True, if you want to keep to spec. Ie this one: 43mm * 21mm * 14mm, weight - my estimation would be 25g (found on Aliexpress, type "Adjustable DC LM2596 Buck module") But there are cheaper things to test. These are unlikely to keep to the advertised amperage for long, but may be good enough to...
  3. quaddamage

    HELP!! After updating to a new firmware I can't detect my tello's wifi.

    tried searching for the wifi host on a different mobile? you may also do a reset again after the downgrade.
  4. quaddamage

    HELP!! After updating to a new firmware I can't detect my tello's wifi.

    If the drone is blinking lights correctly and allows to downgrade the firmware correctly, then it most likely works correctly.
  5. quaddamage

    Battery Reconditioning

    1. Why it stops working From the pictures on O-Gs wiki and from my experience, it looks like the board has a voltage comparator circuit with output which allows to cut off the cells from terminals. So no intelligence, just a simple cutoff if cell voltage drops below 3V. 2. Will it starts if...
  6. quaddamage

    no light no power

    Nothing special in Tello in regard to fixing; go as with any device: First thing is to check power delivery. You need a multimeter, and check test pads on the board. I don't think we have the voltages for reference, so you need to compare voltages to known working board. (unless you can find...
  7. quaddamage

    tello not flashing, not turning, not connecting via wi-fi

    Either fix it or return it. It is easy to disconnect commutators in these small motors by pressing the props too hard. If you're good in tackling tiny stuff, you might be able to fix that - often the springy wires acting as brushes just fall from the commutators.
  8. quaddamage

    Tello having very wierd issues

    Lithium cells get damaged if overdischarged. The general idea is for end consumer to buy a new battery is the old one was depleted to below 3V. When battery gets below this voltage, it starts to deteriorate. When the voltage drops to about 0.5V, at least 20% of the battery capacity is lost...
  9. quaddamage

    Tello firmware analysis

    https://tellopilots.com/threads/is-there-any-way-to-unlock-the-sdk-speed-cap.6329/ Also, since this requires 3 clicks from the above so pretty sure many will miss it: O-Gs Wiki - Firmware m0802, Movidius module
  10. quaddamage

    Why can't I increase the autonomy of my Tello?

    Hm, you sure? Did you used very short and very thick wires to connect the MA cells? If you've eliminated voltage drop on wires as the cause, then the issue must really be in the BMS. Note that for Tello, the battery board doesn't have one - well, depends what you define as BMS; there seem to...
  11. quaddamage

    Tello without BMS

    Ok, let's look at the circuit: https://github.com/o-gs/dji-firmware-tools/wiki/WM004-Battery-Board First you'll notice 4 identical chips. They have 6 legs, but chips often merge legs together - so hard to draw conclusions from that alone. But there are 4 of them, which suggests they might be...
  12. quaddamage

    Tello without BMS

    If you remove the circuit only, then yes, it should fly. There is no feedback from that block to BQ24259. You should probably read BQ24259 datasheet and draw conclusions from there.
  13. quaddamage

    Tello without BMS

    What manages the battery on Tello is the BQ24259. The battery itself does have transistors for cutting power, but they seem to be a part of a simple undervoltage protection circuit, without any memory.
  14. quaddamage

    Tello without BMS

    Noone forces you to anything. Again, this is speculation - I doubt anyone desoldered any chip from the main board and expected this to run. But normal practice in designing such a system is - the chip next to ours doesn't respond -> announce HW fail.

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