Xiaomi MiJia QiCycle Folding Electric Bike Teardown

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Pushing out the small circuit board, we get to the meat of this miracle measurer:
A Micronas HAL1820A programmable linear hall sensor
This takes advantage of the Hall effect to track the wheel as it turns, using that to determine how fast you're traveling (and how hard you're working).
The three wire system is connected with a simple JST connector, not solder. Now that's what we call modular.

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