- This topic has 9 replies, 6 voices, and was last updated 5 years, 9 months ago by Anonymous.
July 20, 2013 at 3:47 am #2546HarshadParticipant
The project is designed to detect vehicle movement on highways to switch ON only a block of street lights ahead of it (vehicle), and to switch OFF the trailing lights to save energy. During night all the lights on the highway remain ON for the vehicles, but lots of energy is wasted when there is no vehicle movement.
This proposed system provides a solution for energy saving. This is achieved by sensing an approaching vehicle and then switches ON a block of street lights ahead of the vehicle. As the vehicle passes by, the trailing lights switch OFF automatically. Thus, we save a lot of energy. So when there are no vehicles on the highway, then all the lights remain OFF. However, there is another mode of operation where instead of switching OFF the lights completely, they remain ON with 10% of the maximum intensity of the light. As the vehicle approaches, the block of street lights switch to 100% intensity and then as the vehicle passes by, the trailing lights revert back to 10% intensity again. High intensity discharge lamp (HID) presently used for urban street light are based on principle of gas discharge, thus the intensity is not controllable by any voltage reduction. White Light Emitting Diode (LED) based lamps are soon replacing the HID lamps in street light. Intensity control is also possible by Pulse Width Modulation (PWM) generated by the microcontroller. Sensors used on either side of the road senses vehicle movement and sends logic commands to microcontroller to switch ON/OFF the LEDs. Thus this way of dynamically changing intensity ON/OFF helps in saving a lot of energy. The project uses an 8051 series microcontroller.
Further the project can be enhanced by using appropriate sensors for detecting the failed street light and then sending an SMS to the control department via GSM modem for appropriate action.July 20, 2013 at 4:55 am #10171AJISH ALFREDParticipant
Nice project. Have you done it or need help from us?May 14, 2014 at 6:20 am #11728
i m doing this tye of project and i m getting trouble in making code.
i m using atmega32 microcontroller, LDR, IR sensors, and pwm concept for dimming the intensity of leds
please help me…………May 15, 2014 at 3:37 pm #11731
your concept is perfect. but to develop even demonstration model you have to do lot of calculations, calibration, like
1) how far you will detect a vehicle ?
2) how many lights you will turn on n off at a time?
3) how many vehicles you will detect at a time?
4) how many inputs (sensors) and outputs (LED) you will use?
5) how you fed PWM to multiple LEDs at a time?
first try to put all these things on paperMay 17, 2014 at 8:05 am #11738
i have right down every thing on a paper only i want to know the how pwm is dimming the intensity
please help me in writing the code………..May 18, 2014 at 12:19 pm #11743
PWM gives variable DC output. the equation for PWM output is
Vcc * Ton / Ttotal
for example if Ton is 50% of Ttotal then output is Vcc / 2
similarly if Ton is 25% – output is Vcc / 4 like wise
so avg DC output varies as pulse width varies.
if this voltage is applied to LED (any DC operated device) its intensity varies.
generating PWM is very simple. if your controller does not have built in PWM channel then you can do this
take two time variables Ton and Toff.
make one delay subroutine that gives delay as per value passed of Ton or Toff
set any one pin of microcontroller to 1
give delay for Ton time
reset that pin to 0
give delay for Toff time
now just change Ton and Toff values like to increase pulse width increase Ton and same time decrease Toff by same value e.g. Ton+=5 and Toff-=5;May 20, 2014 at 7:11 am #11748
i m using atmega32 which has in built pwm
i m connecting ldr at portA which are adc pin for distinguish between day and night
IR sensors are coneected at portB via LM324 comparator ic
and power leds which are 3v are conneted portD
when LDR distiguish as night the o/p LEDs will glow at 40% intensity and as the IR sensor detects any vehicle the intensity of LEDs will increase at 100% intensity with the help of PWM as soon as the vehicle passes over the IR sensor again the o/p LEDs regain its 40% intensity………
how to generate PWM in atmega32 with inbuild PWM
what to do to regain its intensity to 40%June 19, 2014 at 8:08 pm #11841samieParticipant
good day, pls am new here.. i want to build the exact street light control that glows when a vehicle is approaching. i dont have code and also i dont know anything about the project pls hear meJune 21, 2014 at 12:32 pm #11842
to generate PWM with ATMega32 pls follow tutorials given on this site on
EG labs / micro controller / AVRFebruary 6, 2017 at 5:31 pm #14411AnonymousGuest
I need the coding fr this program
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