The document shows block diagrams for a base station and central station of a bus stop display system. The base station diagram includes a PIC microcontroller, RFID reader, CC2500 RF module, keypad, power supply, LCD display, and RTC to receive data and display bus arrival times. The central station diagram is similar but replaces the RTC and display with a PC to collect and process data from multiple base stations.

1. MAX232
PIC
Micro-
Controller
(16f877a)
RFID
Reader
CC2500
RF
MODULE
keypad
Power
supply
LCD
16*2
DS1307
RTC
Buzzer
BUS STOP DISPLAY
(a)BLOCK DIAGRAM OF BASE STATION

2. MAX232
PIC
Micro-
Controller
(16f877a)
RFID
Reader
CC2500
RF
MODULE keypad
Power
supply
LCD
16*2
DS1307
RTC
PC
(b) BLOCK DIAGRAM OF CENTRAL STATION