cheap load cells [found]
I'm looking for an affordable way to measure forces in the 0..200N (40lbsf) range. Building them by myself out of strain gauges would be complicated and industrial load cells are way too expensive. My idea was that there might exist some luggage scale that has a serial port for read out, comparable to those calipers with serial interface.
I'd like to measure lift and drag in a "poor man's wind tunnel" (test object mounted on top of a roof rack on a car ). To measure the force vector I need at least three of them or even 6 to also measure torque. And I'd like to connect them to a data logger (P2 board) for analysis. I alrady thought about pointing a GoPro at the display of a luggage scale but I don't want to buy 3 or 6 cameras. And it would be much more convenient to have the data in numerical format.
I don't care much about absolute precision. 10% error would be acceptable as I only need a qualitative comparison of different configurations.