Advanced Science and Technology Letters
Vol.106 (Information Technology and Computer Science 2015), pp.22-26
http://dx.doi.org/10.14257/astl.2015.106.06
Development of Self-powered LED Street Light and
Remote Controller Utilizing the ZigBee and Smart
Devices
Sungwook Yoon, Hyenki Kim
*
Dept. of Multimedia Engineering, Andong National University,
388 Seongcheon-Dong, Andong-City, Gyeongsangbuk-Do, Republic of Korea
uvgotmail@nate.com, hkkim@anu.ac.kr
*
Corresponding author: Hyenki Kim, hkkim@anu.ac.kr
Abstract. Notwithstanding street lights commonly supplied with power by
connecting to power line and generally controlled by wired type, they need
different type of system under the environment requiring self-charging and
remote control. In this research, a system was developed that enables selfrecharging and remote control with the use of photovoltaic energy of LED
street light that can be effectively used for street roads under specific
environment, and transmission of the state of voltage and LED power
consumption. This system can be used to effectively provide lighting
information and control to remote users under specific environments or
circumstances.
Keywords: Self-powered light lighting, IoT, Remote Control, LED
1
Introduction
As a platform of Internet of Things (IoT) has been brought up, recently integrated
with ubiquitous environment, research is actively being conducted on network control
of USN system under the actual road environment[1,2]. Notwithstanding street lights
commonly supplied with power by connecting to power line and generally controlled
by wired type, they need different type of system under the environment requiring
self-charging and remote control[3,4]. Generally, for self-charging, a prerequisite is to
fix upon a method depending on the degree of charge in regards to charging
efficiency[5,6]. To judge this, the voltage charged requires a continuous check.
Further, the use of LED light can lead to effective lighting by properly controlling
excessive temperature rises and ambient illumination. For this, in this paper, a
prototype was manufactured after designing self-generating LED street light and
remote controller that can collect data at close range and transmit information by
using zigbee, and grasp circumstances by controlling smart devices by using network.
ISSN: 2287-1233 ASTL
Copyright © 2015 SERSC
Advanced Science and Technology Letters
Vol.106 (Information Technology and Computer Science 2015)
2
Design of self-powered LED Street lights using Zigbee and
smart devices and remote controller
Design of self-powered LED street lights using remote control and network and
remote controller system is broadly divided into the following 3 development items.
- Design and Manufacture of self-generated charging circuit and LED street light
drive-unit board
- Network composition and control board manufacture
- Development of relevant software using micro embedded computer
To accomplish these items, a prerequisite is to secure LED drive power technology
using solar photovoltaic energy, and apply wireless data transmission technology and
communication network composition technology in an integrated manner. Together
with this, illumination control technology controlling the brightness of lighting should
be applied depending on ambient illumination. Designed system block diagram is
shown as in the picture.
It was composed with about 6 hours for daily lighting time of street lights, and
about 3 days (i.e. 18 hours) for a period that can prepare for cloudy, rainy days. For
the maximum brightness of it, a 5-Stageis applied to LED lighting consumption
power based on brightness criteria. To implement stable heat management system,
designed was functions such as temperature management control and heat foldback.
When LED temperature rises above safe temperature values, the lifetime and
efficiency of LED lower. In case of using 'LM3424', lighting designers can program
breakpoint of temperature and inclination in the range that LED can be safely
operated. At any condition exceeding temperature, heat foldback circuit of 'LM3424'
decreases the controllable current passing through LED. The decreased current
maintains LED in relevant ranges until it darkens LED in a range programmed by
designers and returns to operating temperatures. By applying booster system, the
driving voltage of LED street light, 24V was supplied to battery voltage of 12V. A 5Stage control procedure was allowed by using the PWM dimming of lighting
brightness enabled depending on ambient illumination in system.
Table 1. Adjust the Brightness of the Backlighting
Lux
Intensity of Light by Stage on Street Light
1 - 30
Stage 5
31 - 60
Stage 4
61 - 110
Stage 3
111 - 160
Stage 2
161 - 210
211 or above
Stage 1
Street lights Off
The possibility of failure or defect can be judged by detecting supply current and
voltage, and transmitting a value to remote sites through serial communication, and
when values of illumination are judged dark, the supply current can be used to check
whether or not LED light is on. For communication between devices, RF modem and
Copyright © 2015 SERSC
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Advanced Science and Technology Letters
Vol.106 (Information Technology and Computer Science 2015)
Zigbee were used. Solar photovoltaic generation and charging circuit were composed
with solar cells for generation.
3
Implementation
App and home server constructed with a single computer output real-time battery
voltage, temperature, and a value of luminance sensor of system by using Arduino
Ethernet Shield and Raspberry Pi. With App, LED light PWM can be controlled, and
activated/deactivated system control can be selected.
A PV module is most efficient when it is installed at a 90 degree angle from
sunlight, and a 12V/120Ah maintenance free lead-acid battery was used for the
battery. Since 306Wh/Day is required for daily power generation for a 6-hour use, the
capacity of battery is 84.15Ah for a 3-day use with 12V. For charging control, solar
cell is used for a main generator, and wind generator is used for an auxiliary generator.
The power generated by wind generator is converted into 12V after the power is
rectified, and let into a next stage of solar cell Buck Convertor of the charge controller.
To prevent charging loss from occurring owing to the maximized output voltage of
solar cell not consistent with the charging voltage of battery, MPPT control was
conducted by using Buck Chopper Converter.
Notwithstanding the circuit topology of Buck Converter consistent with the actual
one, the values of devices between them are different. Concerning a tendency of
circuit operation, Pspice simulation circuits of OR-cad and the results of them are
summarized as the table.
Table 2. Pspice Circuit Simulation Results
Duty ratio
Output Voltage(V)
0.1
6.372
0.3
10.696
0.5
13.134
0.7
14.664
0.9
16.817
비고
Input Voltage
17.5V
PWM fr=33KHz
Period=30.03us
Further, Internet connection enabled small-sized server to be constructed by using
relevant App connected with smart devices and single board computer. This system is
designed to store the data received from time to time it transmits the illumination and
the charge state.
24
Copyright © 2015 SERSC
Advanced Science and Technology Letters
Vol.106 (Information Technology and Computer Science 2015)
Fig. 1. App and Web Server Control Screen for the Web and Smart Devices
4
Conclusion
In this paper, street light system was designed that can be used for the environment
where self-charging and remote control are required, and to design this, different
types of system were required. In this research, developed was a system that can selfcharging and remote control using sunlight of LED street light, and can transmit the
state of LED power consumption. It is anticipated that this system will be used to
effectively provide lighting information and control to remote users under specific
environments or circumstances. Self-generated LED lighting can frequently collect
data on lighting environment through remote control, and street light lighting can be
designed more economically compared to other facilities, which can lead to easy
space composition.
This research leaves a room for further research to design system applicable to
LED lighting devices that can exchange LED effectively controlling promotional sign
and LED module for plant factory.
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Vol.106 (Information Technology and Computer Science 2015)
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