期刊名称：International Journal of Engineering Research
印刷版ISSN：2319-6890
出版年度：2015
卷号：4
期号：8
页码：404-408
出版社：IJER
摘要：The need for an automatic car park gate system has been in increase in recent times following the economic situation in present days. The circuit is aimed at eliminating manual operation of a car park. It incorporate the use of LM741 op-amp and CD4017 decade counter for controlling the number of vehicle that can have access to the parking premises and the circuit is fixed close to the gate with the sensor tragically located where it can sense the presence of a car. The light dependent resistor (LDR) senses both entrance and exit of the cars and this followed the maximum of three cars in the case of this design. As a monitoring and control system, when you comes close to the gate the light dependent resistor senses an incoming ca r which allows the gate to open automatically and closed when done. This process is same for outgoing cars. This module make use of an optical sensor, whose resistance changes with the intensity of light (Horowitz, 1980) the type use is ORP12 and it has a dark resistance of 10M.. When light rays are focused on the light dependent resistor (LDR), the resistance becomes very low (0-500.) but when the rays are interrupted, the increases to its dark resistance (Huiyu, 2010). The variable resistor is used to vary the sensitivity of the light dependent resistor. It is otherwise called dark activated sensor. For the design two conditions are considered. First, when light rays are focused on the ORP12, and second, when the rays are being interrupted. The counter registers and displays the number of vehicle crossing the gate (both entrance and exit) and allows maximum of three cars. Once the maximum is rea ched, the gate entrance remains closed and inaccessible, until another vehicle leaves the park. The car park system comprises of the sensor unit, trigger circuitry, display unit (switching unit) and the power supply unit.
