For Sun detector, I found this suitable circuit to replace the sun-up alarm and so, it have the same functionality with sun-up alarm which is detect the light (sun). The so call 'intelligent' sensor will differentiate between light and dark.
The circuit is depends on a light sensitive called LDR (light dependent resistor). The resistance of the LDR depends on the amount of light falling on it.
In one switch position a light-to-dark transition will activate the relay. In the other position a dark-to-light transition is required. This is why it is called light/dark sensor.
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