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This dark activated switch can trigger a relay to operate an ac lamp at sunset.
Light activated switch circuit mini project pdf. Simple non latching light activated relay switch. These kind of sensor circuits are widely employed in many applications and may come in handy when you intend to build a simple light sensing circuit. In this project i will show you how to build a simple light activated switch circuit using ldr. There are a wide range of applications for light sensitive switches.
Light activated switch circuit light activating and deactivating switches are simple to build when you are provided with a ldr sensing element and 555 switch activator. Using this circuit an electrical device or an appliance like a light bulb or a fan for example can be controlled based on the intensity of the light near the circuit. A simple light activated switch description. This is the circuit diagram of a light activated switch based on national semiconductors comparator ic lm 311 and a ldr.
741 ic circuits and projects with their schematics. Figure 3 shows a simple non latching circuit designed to activate when light enters a normally dark area such as the inside of a safe or cabinet etc. The ldr light dependent resistor. The circuit diagram of the light activated switch is shown in fig.
The lamp remains. A light dependent resistor is used as the sensor. Darkness detector circuits like this can be used in applications where we can automatically turn on lights. Base of pnp transistor t1 bc558 is connected to 6v through a preset vr1 2 2k and to ground through resistor r1 2 2k and light dependant resistor ldr1.
Darkness detector or dark detector is a circuit that detects darkness or absence of light. Light sensitive switch circuit p. Light activated switch is a simple electrical project circuit by which we can switch on and off the electrical load appliances like lights fans coolers air conditioners street lights etc automatically based on the day light intensity instead of manually operating the switches. The automatic light sensor circuit can be used for designing numerous practical embedded systems based projects.
The circuit is based on a voltage comparator circuit wired around ic 1 the non inverting in put of ic1 is given with a reference voltage of 6v using resistors r3 and r4. Figures 3 to 5 show some practical relay output light activated switch circuits based on the ldr. A few light sensor circuit based projects can be listed as a solar highway lighting system with auto turn off in daytime security alarm system by photo electric sensor sunset to sunrise lighting switch arduino managed high. In this project we have implemented a simple darkness detector circuit using the simplest of all light sensors.
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