DIY Power Meter

Keith Hack has posted his latest creation and accompanying DIY guide for the V3 cycle power meter. This design and accompanying software are claimed to measure L/R power. Fabulous..

The 3rd generation (current) DIY PM

Cost breakdown:

V3 Parts Cost	quantity	price	total
Crank	1	140	140
Strain Gage	2	12.5	25
Instrumentation Amp	2	4.1	8.2
Low power ADC	2	18	36
Micocontroller (Pro Micro)	1	25	25
ANT+  AP2 Module	1	24	24
Resistors	4	4.6	18.4
PCB (Rush Proto Service)	1	37.5	37.5
Misc (Caps, wire, pins, etc)	1	20	20
Build a PM for:			334.1

http://keithhack.blogspot.ca/2013/01/v3power-meterthe-complete-how-to.html

Misc: 18/01/2013

"A while back I worked like a dog on my bike (55 miles a day minimum), recorded my weight, calories, and percentages of fat, protein, and carbohydrate for every morsel of food that went into my mouth, and all that time I was struggling to constantly improve my tracking of every aspect of my nutritive life.

It was brutal, and I did it for an extended period of time. I eventually achieved what some were calling my high-school weight.

Immediately people started telling me I was naturally thin." Bob F.

Misc: 04/01/2013

Look what happens when you put your bike in different positions in relation to other riders or objects while travelling at 40kph...

Thanks to SweatScience for the image..