Hi,

This newbee has bought a gorgeous e-bike (45km/28mi hr). Unfortunately a fatal error occurred in its electronics: it's dead now. I'm trying to resurect it myself, as it will be an enormous oppurtunity to learn in this matter.

I bought a controller on Ebay which imho can controll the RPM of the BLDC motor by a throttle, supposed to be a lever on the steer.

I want to restore the level of assistance based on the monitored behaviour of the pedals, so it adapts to torque and RPM that are required.
I think (and plz correct me if I'm wrong):
The throttle takes be a (constant?) signal from 0 - 4.8 V. This can be achieved with a digital pot. It can build up/down resistance by Hall-sensors of the pedal-axis and the realized speed of the bike (if it would go any faster than factory settings: no problemo).

Is this correct? And how to design a simple layout for a PCB with necessary components?

Any help would be appreciated very much, and plz consider my lack of experience

 

I would watch some videos on PCB layout to get a handle on that.
Youtube, or CAD vendor videos.

I see folks using a number of different PCB layout programs, Kicad, Eagle.....

The 0 - 4.8 V could also be an ARDUINO dac.


Regards, Dana.