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. 2013 Dec 23;8(12):e84466. doi: 10.1371/journal.pone.0084466

Figure 10. A simple “wheel” sensor with embedded measurement and feedback system.

Figure 10

Left, force exceeds 10 Newton and LED turns red. Right, force is between 8 and 10 Newton and LED turns green. A-Inner pin, B-external pins, C-spiral shaped bar, D-inner ring, E-external ring, F-embedded electronics for force feedback.