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# Vehicle Indicator Circuit

## Summary

The circuit depicted in the article can be used as an indicator in vehicles. Here two identical circuits are used one for left and the other for right. This project can be installed in our vehicles when the indicators are not working. Even in Bi-cycles at the place of inbuilt indicators that works manually.

IC555 is the most versatile chip and it is (can be) used in all most every kind of application because of its multifunctionality. As we know it’s on chip multivibrator means with IC555 one can design astable, monostable, bistable multivibrators. Its main applications are to generate timings, clock waveform, generate synchronizing signals, square wave oscillator and many more.

## Description

The project here is developed using 555 timer. The timer is wired in astable mode. Now if the power supply is first connected to astable circuit then initially the timing capacitor C1 is discharged. The voltage at pin2 is 0V and the output of timer is driven HIGH. Now C1 starts charging through R1 and R2. Capacitor C1 is also connected to pin6 which is threshold input of the timer.

When the voltage through C1 goes below 1/3 of the power supply, the output of the lower comparator reaches a new value. This doesn’t change the logic state of the flip flop which means that the output remain low. The second comparator’s input get the voltage from pin6 which is threshold input and 2/3 Vcc from internal voltage divider. When the voltage through C1 goes below 2/3 of the power supply the output of the second comparator reaches a new level. The flip-flop change their state and the output becomes HIGH. So the output of 555 timer goes from HIGH to LOW.

## Components

Resistor

Resistor is a passive component used to control current in a circuit. Its resistance is given by the ratio of voltage applied across its terminals to the current passing through it. Thus a particular value of resistor, for fixed voltage, limits the current through it. They are omnipresent in electronic circuits.

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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...

LED

Light emitting diodes (LEDs) are semiconductor light sources. The light emitted...
Transistor BC548

BC548 is general purpose silicon, NPN, bipolar junction transistor. It is used for amplification and switching purposes. The current gain may vary between 110 and 800. The maximum DC current gain is 800.

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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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