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LIGHT DARK SENSOR CIRCUIT RELAY

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LIGHT DARK SENSOR CIRCUIT RELAY

Switch on lights or other devices (<10 Amps total) according to level of ambient light. User configurable

Buy of LIGHT DARK SENSOR CIRCUIT RELAY.
(1-5: £13.99 each, 5+: £13.49 each)


LIGHT DARK SENSOR CIRCUIT RELAY. Switch on lights or other devices (<10 Amps total) according to level of ambient light. User configurable

Additional Information

As described in our article LM741 Light/Dark Sensor Circuit, this circuit is designed to be used to control low current 12 Volt lighting and devices according to the level of ambient natural light.

This circuit is very similar in operation to our light/dark sensor circuit (low current) but it enables appliances with higher current requirements to be controlled. The relay used is rated for loads of up to 12 Amps - equivalent to 100+ of our 12V LED spotlights !

Connections

Below is a connection diagram for this light/dark sensor circuit:

Light/dark sensor circuit with relay - connection diagram

The LDR (light dependent resistor) is supplied with extended insulated leads as shown below:

Light dependent resistor with long fitted leads

These leads are to be connected into the two sockets labelled LDR in the connection diagram - it does not matter which lead goes into which of the two sockets. The LDR must be positioned so that it is not illuminated by any lights controlled by the circuit, and also not illuminated by the red LED on the circuit board (used to indicate when the relay is triggered).

The lighting or device(s) to be controlled by this circuit are powered via the relay: When it is light, the relay switch is open and no power flows through it. When it is dark, the relay switch is closed, and power can flow through it. Therefore, by connecting the lighting/device(s) up as shown below, they will be controlled by the LDR circuit:

Connecting devices and lighting to the relay outputs of the light/dark sensor circuit

Configuration

To set the light sensitivity of this circuit, read the configuration instructions provided for the light/dark sensor circuit (low current).

Related REUK.co.uk Articles

Build a light/dark sensing circuit to automatically turn on/off lights and other devices
Find out more about LDRs and their use in renewable energy projects
Find out more about relays and their uses in renewable energy applications

© 2006-2009 REUK - All Rights Reserved
Page Last Updated on 19th November 2009 at 02:37:30pm

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