Originally Posted by ABLomas
Here are pictures of Mystery 50A BEC.
Few interesting details about it:
- low price
- BEC is separate from ESC, so in multicopter setups can be cut (not needed in most setups)
- Photo in DX site says it's suitable for 4S and more (i bought it for use on 4S), but received with 2-3S sticker. Will test on 4S, maybe that's just BEC limitation
If they work on 4S, then maybe possible to flash them (no ISP pads but probably can trace legs).
Weight without BEC and heatshrink - 24.8g, should be ok for any, non-micro, copter.
Hmm, it's the same price as the 10A board.
It's really hard to tell the routing from that picture, since it must almost all be vias under the chip. However, it looks quite similar to the RCTimer 50A board. If that's the case, verify the gate driver pins (middle two pins on the left/top of the gate drivers, as I recall) route to the port D pins as described by this target .inc: https://github.com/sim-/tgy/blob/master/rct50a.inc
, and that they're not inverted, and maybe that target will work (just pushed).
Also, I just pushed the unified start/run code, which seems to work. I'll test a few more ways before uploading a build. I had also a patch (now reverted) to separate start commutation timing from start edge crossing, which helped the reversing direction under load case for me, but broke normal commutation timing at low RPM. I'm still not happy with the direction reversing (not sure why everyone else is
) since it still sucks if you skip the neutral zone where the brake is applied. I'd rather it brake when it knows it's spinning the wrong way from the requested direction until it stops, then restart. The problem is that it can't get feedback while doing a full-on brake, so it has to do pulsing (which encourages regeneration). The full-on brake also feels like it will tear the magnets off of some of my motors, though I do notice other commercial ESCs do it, so it probably should still be an option.