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. 2020 Dec 28;9:e00161. doi: 10.1016/j.ohx.2020.e00161

Fig. 3.

Fig. 3

Build instructions of the measurement module. (a) All components required for making the measurement module. (b) RGB LED fastened onto the MDF board. (c) Light sensor fastened onto the MDF board. (d) To reduce stray light, paint the light path black with an marker. (e) The light path assembled by fitting claws of the MDF boards into the corresponding claw holes. (f) The finished light path. (g) The measurement module consisting of RGB LED, light path, and light sensor. (h) The finished measurement module.