Indian Institute of TechnologyHyderabad

Railway Level Crossing Lights

By:

Returaj Burnwal

Kunal Raunak

Dhananjay Kr. Gupta

Krishna Kumar

Description

Our project deals with the modern way of railway signaling system. Currently our railway system uses sensors to detect the incoming of the train, which actually involves complicated circuit designing, programming for the same and a huge sum of money. So, in our project we have used some basic devices to do our required purpose WITH OUT INVOLVING SENSORS.

Parts Required

Resistors: 680 ×3, 1k ×3, 33k, 47k, 82k, 270k Capacitors: 0.1µF ×3, 10µF radial ×2 Red LED (3mm best) ×2 Amber light 555 timer IC ×3 8-pin DIL socket for IC ×3 On/Off switch Battery clip Push button

CIRCUIT DIAGARAM

Track Connection

555 Timer

The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation, and oscillator applications.

It is divided into three types based on their circuit design: Monostable -In this mode, the 555 timer acts as a "one-shot" pulse generator. The pulse

begins when it receives a signal at the trigger input that falls below a third of the voltage supply and stops when voltage supply exceeds two third .

Bistable- In bistable mode, the 555 timer acts as a basic flip-flop. Astable- In astable mode, the 555 timer puts out a continuous stream of rectangular

pulses having a specified frequency.

Working Of Circuit

The trigger present in the left corner creates a pulse which triggers the monostable timer and helps in glowing of amber light, further setting the bistable timer to activation, which initiates the astable mode creating continuous rectangular pulses setting LEDs to action.

When train passes off cancelation trigger cancel of the created pulse and hence the circuit is turned off.

REFERENCES

http://en.wikipedia.org/wiki/555_timerhttp://www.kpsec.freeuk.com/

THANK YOU