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Editando passo 6 —

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The motor power lines have some interesting (read: completely mismatched) color coordination going on—fixers take note.

They could also do with some more support and insulation (hot glue) on the solder joints.

Here's what we found on a quick tour of the main board:

GD32F103 GigaDevices ARM Cortex-M3

Six half-H bridge motor drivers, made up of two large MOSFETs each

Two pairs of 0.007 ohm resistors by the power inlet (R007).

Resistors like these, with very low resistance, are used to sense current—helping to shut things down if a motor stalls out.

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