Vehicle Indicator
Summary
Most of the time during the night when the roads are badly lit the risk of accidents increases. Sometimes it happens that our vehicle breaks down and we need help. In such conditions this reflector can be used which automatically gets turned ON when it receives light from another vehicle passing nearby. The circuit is based on 555 timer IC and uses a NE555 version of it. The pin diagram of the IC is shown in the image below:
Description
In other words we can say that in the presence of light, the resistance at PIN4 of IC1 is very low. Hence no signal is passed to PIN4 of IC1 so the voltage at pin 4 becomes equal to zero. As a result of this low voltage the circuit remains OFF and in the darkness vice versa occurs so PIN4 of IC1 becomes high and we get the output.
Circuit Diagram
Components
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Capacitor
Capacitor is a passive component used to store charge. The charge (q) stored in a capacitor is the product of its capacitance (C) value and the voltage (V) applied to it. Capacitors offer infinite reactance to zero frequency so they are used for blocking DC components or bypassing the AC signals. The capacitor undergoes through a recursive cycl... |
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LED Light emitting diodes (LEDs) are semiconductor light sources. The light emitted... |
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LDR An LDR (Light dependent resistor), as its name suggests, offers resistance in response to the ambient light. The resistance decreases as the intensity of incident light increases, and vice versa. In the absence of light, LDR exhibits a resistance of the order of mega-ohms which decreases to few hundred ohms in the presence of light. It can act as a sensor, since a varying voltage drop can be obtained... |
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Potentiometer Potentiometer (Pot) is another class of variable resistors and is used as an adjustable voltage divider. It consists of a fixed resistance track having connections at both ends and a sliding contact, called wiper, which moves along this track by turning the spindle. If only one of the connections and wiper are used, it behaves as a variable resistor or rheostat. In case wiper is not used, it will offer fixed resistance across th... |
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555 Timer IC 555 is a very commonly used IC for generating accurate timing pulses. It is an 8pin timer IC and has mainly two modes of operation: monostable and astable. In monostable mode time delay of the pulses can be precisely controlled by an external resistor and a capacitor whereas in astable mode the frequency & duty cycle are controlled by two external resistors and a... |
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