Simple pseudo myopia correction device design

1206RGB (single)

Single chip microcomputer STM32L151CCU6

0201 package SLP0603 ESD electrostatic diode 5V one-way ESD

Photocoupler

This circuit is mainly used for multi-harmonic oscillators and light-emitting diodes (Light Emitting Diodes (LEDs) with adjustable duty cycle and frequency. It is a kind of semiconductor component. It is used as an indicator light, display LED board, etc. at the beginning; with white light The appearance of LED is also used as illumination. It is known as a new type of light source in the 21st century. It has the advantages of high efficiency, long life, and is not easily damaged. It can not be compared with traditional light sources. When the forward voltage is applied, the LED can issue a single light. Color, discontinuous light, which is a kind of electroluminescence effect. The chemical composition of the semiconductor material used can be changed to make the light emitting diode emit light in the near ultraviolet, visible or infrared light. The multi-vibrator can directly generate rectangular waves without external triggering, and the circuit is relatively simple, so it is widely used in pulse and digital systems. This kind of oscillating circuit can generate rectangular waves mainly because: 1 circuit has strong positive feedback, each pole voltage can change rapidly and the transistor enters deeper cut-off or saturation state; 2 circuit generally has no selectivity Very strong harmonic filtering circuit (or at least not on the output), the harmonic content of the output signal is very rich. Both states of the multivibrator are quasi-steady, so that a rectangular wave can be generated without any additional trigger pulses.