This is the circuit diagram of a light activated switch based on national semiconductors comparator ic lm 311 and a ldr. Light activated switch circuit mini project.
Circuit Panel Light Activated Switch Circuit Using Lm311
Light activated switch circuit diagram. You can say dark activated switch. The potensiometer adjust the trigger on level. This is the light operated automatic night bulb switch circuit diagramusing without relay in this a triac is used at place of relay and ldr for light sensor. 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. It has two internally frequency compensated operational amplifiers. This is a simple and efficient circuit of a light sensor switch or light activated relay switch circuit using a 555 timer ic.
The light activated switch circuit mainly consists of two components. The circuit is based on a voltage comparator circuit wired around ic 1the non inverting in put of ic1 is given with a reference voltage of 6v using resistors r3 and r4. This is dark sensitive and light activated switch circuit in this circuit ldr light dependent resistor is used to sensing the light and darkness. Light activated switch circuit design. The first diagram shows how the circuit can be configured using transistors the second and the third circuits demonstare the principle by using cmos ics while the last circuit explaines the same concept being implemented using the ubiquitous ic 555. The transistor act like as a switch when the switch in on condition then the relay will be activated.
Automatic light operated switch circuit using ldrtriacoptocoupler without relay. The circuit can activate any ac or dc device connected with the relay when light falls on the ldr. A simple light activated switch description. The diode in the circuit diagram shows to be 1n914. Use a 1n4001 or better. This light activated relay circuit presented here uses the 555 timer ic and a light dependent resistor or ldr to form a light sensitive relay in an intruder alarm system or for switching on a lamp at sun set and off at sun rise.
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. It contains a 10k va. The comparator ic lm358 and the ldr. This is ok if you have a light duty relay also the 1n914 is a signal diode so actually does not qualify. This circuit is simple compared to other light sensitive switching circuits it switches a relay so that you can switch electrical appliances also with it you can use the circuit for garden lamps or outdoor or indoor lighting. 1 light activated day night switch using transistors.
The lm358 ic has 8 pins and can have supply voltages ranging from 3 32 volts. At night time all leds glow and in daytime when light falls on ldr all leds switch off automaticallyproject of light activated switch circuit diagram using transistor.
Gallery of Light Activated Switch Circuit Diagram
