How to do automatic changeover switch wiring for solar using LDR and ac light/ATS

In this video am going to show how you can make an AUTOMATIC WIRELESS CHANGEOVER SOLAR PANEL SYSTEM USING a DARK SENSOR WITH CONTACTOR INCLUSIVE In this video, I have used a dark sensor and AC lamp AS MY MAJOR COMPONENTS.
What is a dark sensor?
A sensor that is activated by a lack of light. It is a simple and powerful concept, which uses a transistor (BC 547 NPN) as a switch ON and OFF the light system automatically. It automatically switches ON lights when the sunlight goes below the visible region of our eyes.
Working principle:
The dark sensor works in the way that the LDR comes to the darkness, or in other words, if no light falls on it, the transistor turns on. Then the transistor turns on, it lets the current flow through it, and also the right branch of the circuit is now active. LED starts emitting
LDR
LDR (Light Dependent Resistor): LDR or Light Dependent Resistor is one of the commonly used light sensors. In this project, we are using an LDR to detect darkness i.e. when the intensity of light decreases


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