Principle of optical control music module

In life, there are many devices related to the principle of light control, such as light control lamp, but do you know how light control works?So today we will introduce to you the working principle of our optical control music movement.

1.We can explain it with a schematic diagram of the circuit.

RP is an optical control threshold adjusting potentiometer, which is used to adjust the sensitivity of optical control.

2.When there is light, the RG resistance value of photosensitive resistor is low, the triode VT is on, the relay K is on, the normally open contact is closed, the bulb is on (generally refers to the controlled switch is in working state);

3.When there is no = light, the photosensitive resistor RG resistance value is high, the transistor VT is cut off, the relay K is released, and the bulb is extinguished (generally refers to the controlled switch is in the stopped working state).

4.There are two ways to pre-record sound, which one you like?
A. Light sensor music module.You can give us music file, then when the module sensors light it will play music.
B. Light sensor record module.You can long press to record your voice.When the module sensors light, it will repeat your voice.