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LDR BASED RELAY BOARD
Here we are having two Main Parts
Sensor part and Universal Single Relay Board
Here we used LDR Sensor Board. LDR is a light-controlled variableresistor. Theresistanceof a LDR decreases with increasing incident light intensity; in other words, it exhibitsphotoconductivity. A LDR can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.
Universal Single Relay Board
The Single Relay Board can be used to turn lights, fans and other devices on/off while keeping them isolated from your microcontroller. The Single Relay Board allows you to control high-power devices (up to 10 A) via the on-board relay.
LDR Based Relay Board used to turn on/off circuits, lights, fans, etc when there is change in incident light intensity in LDR Sensor part.