Dark detector circuit
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This document summarizes a dark detector circuit project created by four students. The circuit uses a 555 IC, resistors, a light dependent resistor (LDR), and a buzzer. When light falls on the LDR, its resistance decreases and the circuit is open. When it gets dark, the LDR's resistance increases, closing the circuit and triggering the 555 IC to sound the buzzer, indicating darkness. Potential applications include automatic street light control, automatic lighting control in industry, and security systems.
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Improve the system in our daily life
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Ppt on automatic street light control using ir sensors
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- 1. Dark Detector circuit Project by: Manje Gowda K.R Vivek J Lavanya M.S Madhurishree Maharaja Institute of Technology-Mysore
- 2. Topics Components used What is LDR Circuit Diagram Working Applications
- 3. Circuit Components • +5 to +10 volts supply voltage • 555 IC • 1M,100K,1K ohm Resistors • Light Dependent Resistor (LDR) • 1000pF Capacitor • Buzzer
- 4. Light Dependent Resistor (LDR) An LDR is a component that has a (variable) resistance that changes with the light intensity that falls upon it. This allows them to be used in light sensing circuits.
- 6. Working When the light falls on the LDR, its resistance will be very low. So the current from the power supply does not choose R1=100K ohm resistor path. But when the LDR detects the Darkness its resistance increases. So the current from the power supply chooses R1=100K ohm resistor path. When the terminal 4 receives the supply voltage, 555 IC will be triggered making the buzzer to produce an alarm sound.
- 7. •Automatic street light control •Automatic intensity control of street lights •Automatic lights control system in industry •Protection against no light for security system based projects and many others. Applications