Simple photoelectric controller circuit design using 555 integrated circuit-EEWORLD

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　　The photoelectric controller uses the 555 time-base integrated circuit as the core, has a relatively simple control method, is reliable to use, and has a long life. It is a low-priced, small-sized, and easy-to-make photoelectric control switch circuit. It can be used for the control of industrial production and household appliances.

　　Working principle of the circuit: When there is no light, the resistance of the photoresistor RG is very large (more than 1MΩ), the voltage of the 2nd and 6th pins of the 555 time base integrated circuit is about 1/2 of the power supply voltage (6V), the 3rd pin outputs a low level, the KA coil is de-energized, and the relay is released. When light is irradiated on the photoresistor RG, the resistance of RG will drop significantly (less than 10KΩ), the voltage of the 2nd and 6th pins of the 555 drops below 1/3 (4V) of the power supply voltage, the 3rd pin outputs a high level, the KA coil is energized, and the relay is closed. Even if the light disappears, KA remains in the closed state. Afterwards, if light is irradiated on the photoresistor RG again, the voltage stored in the capacitor C1 is added to the 6th pin of the 555 through RG, making the voltage of the 6th pin greater than 2/3 of the power supply voltage (8V), the 3rd pin outputs a low level, the KA coil is de-energized, the relay is released, and the circuit returns to its original state. Every time the photoresistor RG is irradiated with light, the switch state of the circuit is switched once.

　　Component selection and production debugging: IC uses NE555 integrated circuit, RG should be selected from photoresistors with bright resistance value ≤10KΩ and dark resistance value ≥1MΩ, and there are no special requirements for other components. The parameters of each component are shown in the circuit diagram. After the circuit is installed, it is placed in a small plastic box, with the photoresistor RG exposed, and it can work normally without debugging.

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