Using a BB torque sensor as a bicycle power meter

via

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Dec 13, 2019
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Say I wanted to install a TDCM/Sempu-type bottom bracket torque sensor on a bicycle, and not do an e-bike conversion, just use it as a power meter (watts) for road riding. I'd be looking for the simplest way to power the torque sensor and pass along the output to a display. Any ideas by someone who has thought about this, tried it, or may just have ideas?
 
via said:
I'd be looking for the simplest way to power the torque sensor

I recommend an BAFANG sensor. It needs just 5V, so you can use any USB power bank for supply:
https://www.ebay.de/itm/154277625956?hash=item23eba9c064:g:R4UAAOSwo09f9DPd

For calculating the power from the signals, you can use an ESP32 Module like the WROOM32

Then you can send the data to your mobile phone by Bluetooth. In the simplest way just to a terminal app like BlueTerm, or for graphical plots something like this. Or build something on you own. There are many example projects available.

regards
stancecoke
 
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