30-06-2012, 09:52 PM
variable traffic light controller based on micro controller full project version
microcontroller based traffic light control project
30-06-2012, 09:52 PM
variable traffic light controller based on micro controller full project version microcontroller based traffic light control project
01-07-2012, 04:29 PM
I am be final year student please give me the detail about this project
12-09-2012, 01:19 AM
plz send me the ppt of microcontroller AS SON AS POSSIBLE..
12-09-2012, 11:11 AM
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03-08-2013, 12:26 PM
MICROCONTROLLER BASED AUTOMATIC TRAFFIC LIGHT CONTROLER
AUTOMATIC TRAFFIC .doc (Size: 76.5 KB / Downloads: 24) INTRODUCTION: Traffic lights have become an integral part of human’s day-to-day life. With the advancement in semiconductor technology and a parallel rise in innovation in embedded technology a sea change in the lighting engineering has resulted. Four way Traffic light controller which Has Red, Yellow and Green LEDS. It controls the Traffic lights according to the density of traffic on both sides of crossings. It can use the fuzzy logic also to control the traffic precisely. With this motivation in the mind, this project aims at designing and implementing, a running model of traffic light controller which is controlled according to the density of vehicle on road. We will use AT89s52 microcontroller and Infra red sensor for performing all the computation and control related task. LIGHT EMITTING DIODE Light emitting diode (LED) is basically a P-N junction semiconductor diode particularly designed to emit visible light. There are infrared emitting LEDs which emit invisible light. The LEDs are now available in many colours red, green and yellow. A normal LED emits at 2.4V and consumes MA of current. The LEDs are made in the form of flat tiny P-N junction enclosed in a semi-spherical dome made up of clear coloured epoxy resin. The dome of a LED acts as a lens and diffuser of light. The diameter of the base is less than a quarter of an inch. The actual diameter varies somewhat with different makes. The common circuit symbols for the LED are shown in Fig. It is similar to the conventional rectifier diode symbol with two arrows pointing out. There are two leads- one for anode and the other for cathode. LEDs often have leads of dissimilar length and the shorter one is the cathode. All manufacturers do not strictly adhere this to. Sometimes the cathode side has a flat base. If there is doubt, the polarity of the diode should be identified. A simple bench method is to use the ohmmeter incorporating 3-volt cells for ohmmeter function. When connected with the ohmmeter: one way there will be no deflection and when connected the other way round there will be a large deflection of a pointer. When this occurs the anode lead is connected to the negative of test lead and cathode to the positive test lead of the ohmmeter. ELECTRICAL CHARACTERISTICS OF LEDS: - Electrically, a LED is similar to the conventional diode in that it has relatively low forward voltage threshold. Once this is exceeded the junction has a low slope resistance and conducts current readily. An external resistor must limit this current. Forward voltage drew across red LED is nominally 1.6 V but spread with commercial diodes, it may be as high as 2 volts or so, while the Green LED drops 2.4V. This difference accounts for use of lower limiting resistor used with the Green LED. Another important parameter of the LED is its maximum reverse voltage rating. For typical Red device it is of the order of 3 volts. But for Green LED it is somewhat higher- 5 to 10 volts. The LED produces light only when a d.c. current is passed in the forward direction and the amount of light emitted by a LED is proportional to the forward current over a broad range. It means that light intensity increases in an approximately linear manner with increasing current. DESCRIPTION OF BLOCK DIAGRAM As shown in the FIGURE a microcontroller is programmed to automatically “ON” and “OFF” the LEDs (traffic light). The crystal oscillator is provides the necessary clocking for the microcontroller to work properly. The four traffic lights, shown as 4 groups of 3 LEDs (Red, Green, Yellow), is actually installed at each of the four roads. The necessary stabilized power source is designed by the use of LM7805, as shown above (in the lower figure). The whole circuit will be implemented on a zero PCB. The programming of the Microcontroller can be done either in C or in Assembly, using a programmer. LEARNING OUTCOMES: Understanding the hardware detail of a 8051 microcontroller Microcontroller programming 7 segment display interfacing and use of Temperature Sensor Introduction to DC motor
27-02-2014, 05:39 PM
please can anyone give me the program code for density based traffic control system using 8952 microcontroller? |
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