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Apr 09, 2016, 08:14 PM
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Feiyu mini 3D teardown 2


Managed to get the USB->serial dongle working in VirtualBox, since it's a ttyUSB instead of a ttyACM. The problem is the gimbal has to be turned on after the firmware update tool is already listening. The firmware update tool waits for a start code so it can force it into bootloader mode. PWM did indeed have to be off. TX came from the pitch PWM. RX went into the yaw PWM.

So the Feiyu turned out to already have 1.14, the latest firmware. That left waiting for another firmware update in the future or programming it from scratch. Feiyu already discontinued the mini 3D, so another update is unlikely.

Tearing it down revealed a bewildering nest of miniaturized boards which would have to be reverse engineered. The same board is replicated for each motor. There is only 1 IMU.

Next, we have an MV358 op amp, given away by some RC pairs next to it. It probably amplifies a signal from a chip marked only 01281000, undoubtedly a hall effect sensor despite the lack of any Goog results. It's directly under a magnet on each motor which serves no purpose other than giving the motor's orientation. These magnets are circular polarized to give a varying field for each position.

The same firmware probably runs on each board, relying on the placement of jumper resistors to know which board it is. Communication between the boards, how to change the firmware with the existing bootloader, how to control the motors are all the great tasks. It would have been a lot easier if they just allowed configuring the product.
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May 17, 2016, 02:14 PM
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nice! would be nice too a teardown of the new 3D PRO. Thanks for the work!
Apr 06, 2018, 11:49 AM
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i can't find it in stock any place on line what gives?


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