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Hooking a bafang gear sensor to a universal controller

Mbtb_34

New Member
Jul 24, 2024
1
0
Europe
Hi

So I am trying to hook an external bafang gear sensor to my universal controller on a mid-drive-bike I have that has a universal controller. Because I like the feature of the gear sensor for a mid drive and I had one left over.

My thinking is to hook this gear sensor to one of the brake sensors. I have two brake sensors, which both of them individually have two cables. Four cables there in total.

My gear sensor has three wires. Blue, red and ground. I am thinking I will solder the blue wire from the gear sensor to one of the red wires from one of the two brake sensors. To supply the gear sensor with power I am going to splice its red and ground wire onto the throttle or PAS-cables ground and 5V-cables.

When I hooked the battery onto the bike and checked one red from the brake sensor and one black from the brake sensor I could see the voltage sometimes shooting above four. Not sure if this is too high and the whole thing could cause a short, if I connect the gear sensor signal wire to one of the red wires from one of the two brake sensors?

Do you think this would work? Or was the voltage so high when checking the brake sensors, that this operation might cause a short in the system?

Controller brake sensors are the ones to the far right here below:

1721818953743.png
 

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