Bike Power Meter with Crank-mounted WiFi Strain Gauges
 

In any motorsport, the more you know about how the engine is performing, the better a driver is likely to do in a race. That holds for bicycles, too, where the driver just happens to also be the engine. There are plenty of cheap bike computers on the market, but the high-end meters that measure power output are a bit pricey. [chiprobot] is looking to change that with a home-brew, low-cost bike power meter.

http://hackaday.com/2016/04/03/bike-...strain-gauges/