TRAFFIC LIGHT WITH MICROCONTROLLER 89C51 MICROCONTROLLER
Traffic light density control and RED light crossing Indiaction
CIRCUIT WORKING OF THE TRAFFIC LIGHT.
In this project we will make project on traffic light and will use sensor to check maximum intensity. We will use sensor to identify maximum intensity. Where ever will be maximum intensity, our system will give green to that side. And will check other sides also and will give priority to other sides also. We will also check red light jump . if any one crossed red light then it will indicate on buzzer.we will add one more modification . we will show when person crossed green light from one chowk then person driving with 40 Km/hr will get green light at chowk 2 . we will use 8051 controller for this project . because we studied 8051 in sixth semester.
PIN NO 40 OF THE IC IS CONNECTED TO THE POSITIVE SUPPLY. Pin no 20 is connected t o the negative power supply. Pin no 9 is the reset pin . On this pin we provide a positive pulse by the capacitor and resistor network and reset the ic when power is first on. Crystal is connected to the pin no 18 and 19. Collector of each transistor is connected to the common point of the each display.total eight transistor is control total eight display. Enable data from the microcontroller is from the port p2.0 to p2.7 total eight enable data.
Basic connection of microcontroller. These connection are common for every circuit. 9 volt supply for the regulator is from the battery or from rectifier power supply.
All the l.edí s are connected to the Port p1 and port p3. total 16 output from the two ports to 16 different outputs.
STEP DOWN TRANSFORMER 9-0-9
DIODE IN 4007 (4)
7805 VOLTAGE REGULATOR.
10 MFD (1)
10 K OHM(1)
L.E.D YELLOW (4)
SEVEN SEGMENT DISPLAY COMMON ANODE
RED LIGHT JUMP OPTION.
For this option we use ic 555 as a main ic. Here ic 555 work as a monostable timer. Pin no 4 and 8 of the ic is connected to the positive supply. Pin no 1 is connected to the negative supply. Pin no 3 is the output pin and buzzer is connected to this pin. When Red light of the traffic light is on then Microcontroller provide a negative data on this time. Due to this negative data we switch on the PNP transistor bc 558. Emitter of the PNP transistor is connected to the positive supply. Collector is connected to the positive supply. When red light is on then PNP transistor is also on and collector become positive at this time. When pin no 4 is become positive then ic 555 is on and it is capable to sense a infra red interruption. For red light jump option we use one infra red transmitter and one infra red receiver diode. When light fall on the photodiode then photodiode resistance become low and due to that pin no 2 is more positive and alarm is off. As any body cross this light then photodiode resistance is become high and pin no 2 get its voltage from the 33k ohm resistor. Now when pin no 2 is become low then pin no 3 become very high and due to this NPN transistor is automatic on and buzzer is still on.
∑ Low cost-Component we used are not too costly. We are using embedded technology for this purpose.
∑ Portable- We can carry project anywhere it can be light in weight.
∑ Components available in the market- we checked we found components available from Midha Electronics, Model Gram, Ludhiana
Myke Predko- 8051 Microcontroller
8051 microcontroller by Ayala