A very simple photosensitive switch circuit that can be used to automatically open the door under the influence of a beam of light in applications such as automatic lighting on the scale, using the electronic plan from the picture below. This photosensitive switch circuit uses a photo detection method for the bridge circuit and places the elements used in a comparative "balanced bridge" detector. The comparator output is controlled by a transistor thyristor. For this track, protective measures must be taken as it is not insulated from photoresist (LDR). IC1 is a comparatively configured and used voltage that will have a potential at the inverting input (negative) that will exceed the non-inverting input voltage by approximately 1.8 V.
Resistor R5 creates a lag of approximately 1 V oscillating light to prevent T1 and thyristors. The critical point of the comparator can be adjusted from P1. As the potential is set to the lowest (minimum resistance) the light will be illuminated at dusk. If you want to learn more about the flexibility, replace the 1Mohm value with P1. If you want to reverse the operation, the position of the photosensitive plan can be changed in the P1/R4 group. The LA1 light goes out, in this case, in the dark. The maximum gate current is 250 microamps of Th1, which means you need to use a very sensitive thyristor.
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