T10 torque PAS bottom bracket

[JoltJockey]

Hello, does anyone have experience with this torque sensing BB? I'm doing a VESC - based build and would like to use it together with a bit of code on a esp32 to throttle map cadence+strain and send it to the VESC as a single analog signal.

I can read out the direction and cadence signal with the esp32 readout or a multimeter. However even when straining the spindle by turning two wrenches in opposite directions I can't get the Voltage between ground and the white wire (torque signal) to increase from the baseline of 1.5V. I'll install it in the bike frame later on and see if that changes something but I don't see how it could..

Any inputs or experiences are appreciated

 

[stancecoke]

does anyone have experience with this torque sensing BB?

This sensor doesn't measure the torque but the bending of the shaft caused by the force of the chain.
I've written a detailed review on the German Pedelecforum years ago.

I've added support for this kind of sensors and the Bafang UART display to the VESC code also, so no further hardware is needed.

 

[JoltJockey]

Oh wow, that's what I have been looking for - thanks!

Do the Bafang units work directly with that VESC code as well or does it require the display unit as an intermediary? I was under the impression that it is a proprietary digital Signal unlike the t10/15 etc..

I just got the torque signal now that the BB is installed in the frame.

 

[stancecoke]

I was under the impression that it is a proprietary digital Signal

Bafang has different versions. The analogue one has signals quite similar to the Txx sensors. Pulses for the cadence and linear voltage for the torque.
The CAN bus version still has the quadrature PAS pulses, but the torque information is transmitted via the CAN bus.

does it require the display unit

The display is not needed, but of course it is convenient for showing speed, power and for switching the assist levels.

I'm recently analyzing the analogue BAFANG sensor. In my old BAFANG review on the Pedelecforum, I thought, the signal on the green wire would be a linear voltage also, but looking at it with the scope, I see, it is just a processed signal of the quadrature signal.