Light Operated Relay Circuit using LDR

Light Operated Relay Circuit using LDR

Light Operated Relay Circuit using LDR.

The LDR varies its value (ohms) depending on the amount of light that illuminates it. The more light less resistance and less light more resistance, The level of light that makes the relay activated is adjusted to the desired value with a potentiometer.

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Water Level Controller Circuit using Transistor and Relay

Water Level Controller Circuit using Transistor and Relay

Water Level Controller Circuit

This simple Water level controller circuit is useful to control the water level in a tank. It does this by turning On and Off a water pump depending on the status of the sensors.

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Light detector circuit using transistors and relay

Light detector circuit using transistors and relay

This light detector circuit activates a lighting device through a relay when the intensity of the daylight is no longer sufficient.

It can be used to illuminate the main entrance of the house, a showcase that must be kept lit at night, an unsafe area at night, etc.

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Twilight switch circuit with operational amplifier and LDR

Twilight switch circuit with operational amplifier and LDR

This Twilight switch circuit activates a light, a lamp, a motor, etc., at the time of sunset and performs the reverse process at dawn.

This is an ideal circuit for activating a security light that must be on all night.

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Dark detector circuit using LDR and relay

Dark detector circuit using LDR and relay

Dark detector circuit using LDR and relay

This circuit uses, as a main component, an LDR (photoresistor). An LDR changes its resistance value depending on the amount of light it received.

The more light means less resistance, the less light means more resistance.

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