This document describes a system to announce bus arrivals and departures at metro bus stations. The system uses RF transmitters on buses to broadcast identifying signals and RF receivers at stops to receive the signals. It will display the incoming bus name on an LCD screen and announce it with a speaker. An infrared sensor detects when buses are approaching or leaving and triggers the announcement. The system is designed to inform passengers, especially illiterate people, of which bus is arriving.

1. BUS ARRIVAL AND DEPARTURE ANNOUNCEMENT
SYSTEM FOR METRO BUS STATIONS
ABSTRACT
Generally, journey in a bus is a safe and comfort factor. During the journey for longer
distances we should prefer to bus than any private vehicle. Whenever we are traveling for
longer distances we feel tired and asleep. When the bus reaches the station suddenly we
wakes up then we can’t know where the bus is or the persons who are illiterate can’t know
where exactly the bus is currently. To overcome such kind of problems, this project is being
designed using RF technology.
RF transmitters are electronic devices that create continuously varying electric current,
encode sine waves, and broadcast radio waves. RF transmitters use oscillators to create sine
waves, the simplest and smoothest form of continuously varying waves, which contain
information such as audio and video. Modulators encode these sign waves and antennas
broadcast them as radio signals. There are several ways to encode or modulate this
information, including amplitude modulation (AM) and frequency modulation (FM). Radio
techniques limit localized interference and noise.
In bus we will be having RF TX and at the stop we will be having RF RX. So, we can
identify which bus is coming to the bus stop through the RF signals and will be displayed on
the LCD along with voice on the speaker. To identify weather the bus is coming to the stop or
leaving from the stop we will be using another technology called IR.
The concerned Bus names are also annunciated with the help of voice circuit which is
interfaced to the microcontroller.

2. BLOCK DIAGRAM
BUS CIRCUIT
Battery
KEYPAD
RF
ENCODER
RF TX
BUS STOP CIRCUIT
LCD
Power
Supply
Micro
controller
REFLECTION
SENSOR
(AT89S52)
Voice
IC
SPEAKER
R
F
D
E
C
O
D
E
R
RF
RX