Abstract:
At present, the necessity of Telecommunication is dramatically increased for modern lifestyle. Especially mobile phones, sent and received
signal stations, which are high towers, is set in order to distribute the signal from main telephone network to each mobile phones. For example,
Total Access Communication Co, Ltd. has 7,900 of these high towers to support customers. There high towers have to fix the red twinkle lamps
to show emergency barriers for transportation by air at less sunlight. According it the International Civil Aviation Organization ( ICAO ) , if the
height of the tower is less than 45 m, the emergency barrier is the incandescent lamp covered with red translucent materials. Its brightness is not
less than 32 candelas. However, it consumes a lot of energy. Normally, a 100 watt tungsten lamp is applied. Since this lamp is made of tungsten
, its useful life is short and loss the energy in the form of heat (90% of total energy output).
Thus, this research was established to reduce 50% of electrical power of the emergency lamp and still provide the light intensity with in
ICAO standard. A microcontroller was developed to control the LED lamp by the frequency switch. The circuit duty was defined by
amount of the output pit of microcontroller. The energy source of this circuit was came from solar cells.
The experimental results had shown the developed microcontroller provided the light intensity, 2530 LUX but consumed only 4.8 Watts
of electrical power. Power consumption was reduced to 95.2% at 37.50% duty. This was an optimum point because the conventional
circuit.