nowholeself
1 W
I'd like to fashion my own bottom bracket torque sensor. The bottom bracket tube is 46mm ID, though I can go bigger if necessary. The current spindle is 19mm, though I may switch to a 22mm. Ideas? Threads?
amberwolf said:it would've been a potentiometer mounted to the pivot of a springloaded roller on the top side of the chain, and the voltage on the pot would've been detected by an op-amp and amplified and turned into a throttle signal, calibratable with pots on the op-amp...there are better ways to do it but that would've worked).
That's easy--just design it to output a throttle signal (like the BeamTS, the Sempu, etc). Then you plug it in in place of the throttle.AHicks said:The stumbling point for installing a torque sensor in my mind, is where are you going to plug in/connect the wires coming from the torque sensor?
Installing the torque sensor is the easy part. Now you get to pick out a controller that's able to translate the signal coming from the torque sensor into something useful. The controller on the bike now most likely has no place to plug in a torque sensor, or ability to translate the signal.
nowholeself said:Thank you for your detailed replies AmberWolf. I'll likely be sticking with an ASI BAC855 controller, which I assume can accommodate the sort of signals the TSDZ2 would be sending. I'll be sure to check out that thread. If you know of a page or section in that thread that gives a sort of "how-to", please let me know.
That depends on your gearing range as well as your speed range.HrKlev said:The faster you pedal, the less torque you manage to put into the pedals,
amberwolf said:That depends on your gearing range as well as your speed range.HrKlev said:The faster you pedal, the less torque you manage to put into the pedals,
amberwolf said:One way to fix that would be to create the system in a way that assists less at the lower speeds so that the curve of assist vs human input remains the same across the speed range from zero to max.
I don't know how to do that, but it should be possible.