Automatic Light Controller
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Reducing the wastage of power Reducing physical efforts Improve the system in our daily life Light falls on LDR, it shows its minimum resistance and voltage drops across LDR less than VBE of Transistor Q1. So, no current will go from the collector to the emitter and transistor remains turn off.
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AUTOMATIC STREET LIGHT.pptJAGANNATHCYBERCAFE1 The document describes an automatic street light circuit that uses a light dependent resistor (LDR) to sense light levels and control a relay that switches a light on and off. When it is dark, the resistance of the LDR increases, which causes a transistor to turn on and energize the relay, powering the light. During the day when it is light outside, the LDR's resistance decreases and the transistor turns off, cutting power to the light. Key components of the circuit include an LDR, transistors, a relay, resistors, and a battery power supply. The circuit can be used to automatically switch any light on at night and off during the day based on light level changes.
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Automatic street light using ldr and relay
Automatic street light using ldr and relayShivam Raidas The document describes an automatic street light controller circuit that uses relays and an LDR (light dependent resistor). The circuit uses an LDR, which has a resistance that changes based on light levels, along with some other components connected to an operational amplifier IC. The circuit is able to automatically turn on street lights or household lights when it gets dark based on the changing resistance of the LDR. It provides light when needed using very few, low power components, requiring no manual operation or maintenance.
Automatic street lighting system
Automatic street lighting systemEngr. Md. Raihan Hossain This document presents an automatic street lighting system that uses a light dependent resistor (LDR) and transistor to switch street lights on and off automatically based on sunlight levels. The system aims to reduce power wastage and physical efforts by automatically turning lights on when sunlight decreases and off when sunlight is detected. Key components include an LDR, transistor, LED lights, and other basic electrical elements. Advantages are energy savings and safety, while limitations include power capacity and sensitivity to shadows. Future improvements could adapt the design for commercial use and higher voltages.
Direct sensing
Direct sensingshravan900 The document discusses electronic sensors and provides examples such as light dependent resistors (LDRs). It describes the key parts of a sensor including the sensing device, processing unit, and output device. It then focuses on LDRs, explaining their construction, characteristics, and how they can be used in a potential divider circuit to measure light intensity.
switch circuit control
switch circuit controlKumar Shivam This document describes a wireless switch circuit control system that uses a light dependent resistor (LDR) to detect hand gestures and switch electronic appliances on and off. When a hand is placed over the LDR, it causes the circuit to toggle a JK flip-flop, changing the output and switching the appliance. The circuit provides contactless switching to reduce electric shocks while allowing children to safely operate devices. It uses common electronic components like an LDR, capacitor, resistor, transistor, diode and operational amplifier.
Automatic street light using ldr and relay
Automatic street light using ldr and relayShivam Raidas The circuit uses an LDR, operational amplifier IC CA3140, and other components to automatically control street lights. The LDR's resistance varies with light intensity, affecting the voltage inputs to the IC. During the day when the LDR resistance is low, the IC output is low and the transistor cuts off, turning off lights. At night when the LDR resistance increases, the IC output goes high, turning on the transistor and lights. A relay is used to control higher power street lights since it can isolate the small IC signal from the larger street light loads.
automatic light control at night ppt by Shubhan raj
automatic light control at night ppt by Shubhan rajShubham Raj This document presents a project on an automatic light control circuit that can switch lights on and off without manual operation based on ambient light levels. The circuit uses an LDR sensor to detect light intensity and control a relay driver IC and relay to power the lights. It includes sections describing the hardware requirements, circuit diagram, components, simulation, PCB layout, advantages, and conclusions. The system is intended to automatically control lights to save electricity while requiring minimal maintenance.
A2 Direct Sensing
A2 Direct SensingMukesh Tekwani The document describes direct sensing using light dependent resistors (LDRs), which are sensors whose resistance decreases when exposed to light. An LDR contains a thin film of cadmium sulfide that allows more current to flow when photons hit it and remove electrons. The document explains how LDRs can be used in a potential divider circuit to produce an output voltage that varies with light intensity measured by the LDR.
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Automatic Light Controller
- 1. Under the Supervision Of Md. Ashraful Islam Jewel Lecturer, Department of CSE Submitted by Md. Mahfuzur Rahman 201130496 Dept. of Computer Science and Engineering Asian University of Bangladesh
- 2. Reducing the wastage of power Reducing physical efforts Improve the system in our daily life
- 3. simple and powerful device, which uses Transistor (BC547 NPN) switches ON lights (LED) when the light (i.e. day light) decreases switches OFF lights when light falls on LDR
- 4. Transistor BC547 LDR (Light Dependence Resistor) Resistor LED
- 5. Transistor BC547: has an emitter terminal, a base terminal and a collector terminal current flowing from the base to the emitter controls the collector current
- 6. LDR an electronic component whose resistance decreases with increasing incident light intensity used in a potential divider setup with a second regular resistor Resistor resist the flow of current across the resistor device adjustable resistors are refers to as potentiometers
- 8. Light falls on LDR, it shows its minimum resistance and voltage drops across LDR less than VBE of Transistor Q1. So, no current will go from the collector to the emitter and transistor remains turn off.
- 9. No light falls on LDR, it shows its maximum resistance and voltage drops across LDR greater than VBE of Transistor Q1. Now the transistor enters into ON state and at the output side Ic current will flow through the LED. So, the LED is ON
- 10. Energy savings Low cost Safety and Security Reducing physical efforts
- 11. It has a limitation of power Light turns on when shadow falls on LDR LED is a low voltage device
- 12. By using same concept we can modify this project for commercial use It is possible to make the project appropriate for high voltage of power
- 13. Question ?