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Re: 2016 Bosch motor 6004 RA3 194-06
As mentioned you must supply a power source for the hall circuit since it doesn't feed of the motor power inputs.
Just as a reference I made a comparison of reading the hall signal with 12V and 6V input (power supply wouldn't go any lower). At 12V the difference from peak to valley is ~3.9V. It's ~1.6V with 6V input. May explain why the Robo Rio is having trouble reading at the lower voltage.
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