This article describes a 555 time base circuit to form a light control circuit. Because it does not require a dedicated transmitter, it is a telemetry circuit. The photodiode VD1 is used for light detection and conversion, and different performance photodiodes can be used as needed to convert infrared light or visible light into electrical signals. IC1 uses NE555 to form a Schmitt trigger, which shapes and powers the received optical signal to drive the subsequent circuit. The driving current is up to 200mA, which can directly drive the relay or micro motor. As shown in the figure below, this circuit is a positive logic control, that is, ICl outputs a high level when there is illumination, and outputs a low level when there is no illumination. If you need negative logic control, just make VDl and R1 easy to position each other. The C1 and R2 integration circuits filter out interference pulses to prevent malfunction. The power supply voltage ranges from 5V to 12V. R1 is adjusted as needed during debugging to make the circuit have appropriate sensitivity. The circuit can be used for infrared detection, anti-theft alarm or danger prohibition alarm; if the optical detection head of the circuit detects the production process, the output is connected to the electronic counter, and can also be used for generating the quantity detection of the online product and detecting the quantity of the paper passing by the printing machine.
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