With the development of digital technology and network technology, street lamp digital and network has become an inevitable trend.
To save energy and ensure life, improve the management level of lighting lamps and lanterns, beautify the city night and ensure the safety of the city at night and so on, has become a basic requirement of the lighting system.
The continuous development of social civilization, the swelling of city scale, urban lighting has not only confined to the road lighting, society, open to turn off the lights for lighting rate of accuracy and real-time performance of the fault detection and maintenance of timeliness, street lamp energy requirements are also increasing.
Number of rapid growth, expansion of the city street lamp artificial real-time monitoring control method in the fault processing, on-demand control, energy saving, etc, has been more and more not suitable for the development of the city.
So for street lamp intelligent control and energy saving measures have been taken very meaningful.
LED intelligent street light control system designed in this paper the STC89C58RD microcontroller as the main control chip, which can realize the clock timing open to turn off the lights, according to the environment changes of light and shade to achieve open to turn off the lights, lights automatically adjust according to the traffic situation, street lamp fails to implement sound and light alarm, and a series of intelligent behavior.
1 system overall design scheme system using photosensitive diode detection environment light and shade change, using infrared receiver device as according to the traffic lights automatic regulating device, install the infrared emitter on the light pole, infrared receiver installed in lamp bracket above, when photosensitive diode detect light, and infrared receiver infrared signal is detected, the lamp will light up, the opposite is not bright.
Programming technique was used to realize timing, design lamp lights to turn off the lights, select the LCD12864 display devices, display accordingly.
System structure diagram as shown in figure l.
2 unit module design 2.
Part 1 clock timing
we choose STC89C58RD chip, itself a programmable timer/counter, can be realized through software programming timer/counter.
When to set the time, the corresponding timing set tasks.
2.
Part 2 photodiode
the circuit adopts the photosensitive diode as the main control components (
See figure 2)
, when there is no light, reverse resistance is very big, reverse current is very small;
When a light photons hit near the p-n junction, so electronic a hole near the p-n junction is right, they in the PN junction is prepared by the internal electric directional movement, the formation of photocurrent.
The more light, the bigger the photocurrent.
So according to different environment light and shade output voltage signal.
2.
3 the infrared receiving emission part (
Detection of traffic road lights out)
respectively according to the requirements on both sides of road lamp posts are installed on the infrared receiver (
See figure 3)
, signal receiver connected to the microcontroller, when vehicles or pedestrians pass, the receiver to detect infrared, detect high level input signal end, so as to control street lamp light out.
2.
Part four acousto-optic alarm failure,
street lamp LED0 light, buzzer sounds, sound and light alarm function (
See figure 4)
。
MCU P0.
7 -
When a foot to high frequency electric, LED0 lighted, and triode conduction, buzzer sound.
2.
Part 5 shows part of the
the LCD128 * 64 as the display (
See figure 5)
, the main reason is that by using this display can be display images and characters, function is very powerful, by displaying the prompt control of the whole circuit control.
2.
Part six constant-current source
the circuit provides a constant current (
See figure 6)
, make the load Q3 termination load, stable work.
Load changes will not affect current.
so that lights can work stable.
By adjusting the input voltage can be the corresponding change of current output.
While TIP122 darlington tube collector C reference voltage can be l2 -
20 v。
2.
7 street lamp stand or fall detection part
the circuit using a LM358 structures of two voltage comparator, respectively, can detect the stand or fall of P1 and P2 side two street lamps.
When the street light conduction work, comparator 2 feet and 6 feet will have voltage, the comparator 3 feet, 5 feet by sliding resistance to adjust the voltage, and adjust the voltage to 3 feet, 5 feet respectively smaller than the working voltage of 2 feet and 6 feet, but can not be set to 0 V.
SCM P0 so street light work properly.
5 feet and P0.
Output low level 6 foot, street lamp has a failure, P0.
5 feet and P0.
6 feet will output high level.
3 system software design system software block diagram as shown in figure 7.
4 system test result of
LED street lamp driver test results (output voltage, current
See table 1 and table 2)
。
load a (table 1
A lamp)
2 (table 2 load
Two light)
5 conclusion
this paper proposes a design scheme of street lamp intelligent control system based on single chip microcomputer, and completed the design of hardware and software.
Intelligent control device can automatically adjust according to the traffic situation lighting condition: when the vehicles or pedestrians near the street lamp, street lamp lights gradually;
When the vehicles or pedestrians from street lamp automatically dimming and finally go out.
Controller can independently control each lamp lights and turn off the lights.
The system overall cost-effective, low maintenance cost, low power consumption, environmental protection technology, in line with the requirements of green economy and economical society.
edit: Steve
