Traditional Chinese Practical Anti myopia photometer: Circuit Design, Parts List & Workshop Prototype Guide

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In short: Traditional Chinese Practical Anti myopia photometer. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 1730 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.

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Anti-myopia photometerAnti-myopia photometer, when the light illumination is lower than the standard illumination (100lx), it emits a music alarm to remind you to pay attention.This photometer circuit is shown in Figure 20. Its core device is a music doorbell chip IC (model HY-1). RG is a photoresistor (MG45 type is available). It is connected between one end of the oscillation resistor and the ground. When RG is illuminated by strong light, RG shows low resistance, which stops the internal oscillator of the IC. Therefore, the music IC has no output and BL is silent. …

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