Bicycle Power Meter

www.analog.com/en/application... This bicycle power meter video shows how to measure the power output by a person riding an exercise bike. The solution is a low power, wireless system comprising a MAX41400 instrumentation amplifier connected to strain gauges mounted to the bicycle’s crank arm. A MAX11108 ADC and a MCU communicate wirelessly with a tablet. The solution has a low-cost bill of materials and low power consumption for long battery life. The rider can also use a wrist-worn, ADI biometric sensor platform to stream data such as heart rate, oxygen saturation, and ECG to a PC GUI.
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[@k1zmt]

I like the idea of making an inexpensive power meter but there are a few questions. First of all - packaging for on-crank installation. To measure a deformation we need to have a rigid connection to the crank. We need to either drill a crank or glue the device with epoxy. Both methods are destructive. Gluing seems like a poor choice because amount of vibration and constant temperature shifts might destroy the bond quite quickly. One of the options is to build cranks from composite materials and embed the device into the cranks. In this case we can embed high-quality long-lasting rechargeable battery. Using magnetic pogo pins is the best way to charge such devices. I own Favero pedals and I could say they measure way more than just a power. Also, pedals connectivity goes beyond Bluetooth. There is actually a de-facto standard protocol called ANT+.