17-05-2012, 05:18 PM
Design of a Microprocessor Based Automatic Gate
[attachment=22307]
INTRODUCTION
The need for automatic gates has been on the increase in recent times. The system described here incorporates the use of a microprocessor as a controller in achieving the aims of this project. It is no exaggeration to say that the microprocessor has revolutionized the electronics industry and has had a remarkable impact on many aspects of our lives (1999).
GENERAL OVERVIEW OF THE SYSTEM
The research work presented here is the design and development of a microprocessor based automatic gate. As a monitoring and control system, the microprocessor was used to read in data values from the input device and interact with the outside world.
SENSOR UNIT
This module makes use of an optical sensor, specifically a light dependent resistor (photo conductive cell), whose resistance changes with the intensity of light. The type used is ORP12 and it has a dark resistance of 10MΩ. The sensor unit is shown in Figure 2. When light rays are focused on the LDR, the resistance becomes very low (0-500Ω) but when the rays are interrupted, the resistance increases to its dark resistance. The variable resistor is used to vary the sensitivity of the LDR. It is otherwise called Dark Activated Sensor.
HARDWARE AND SOFTWARE DESIGN CONSIDERATIONS
Certain specifications, parameters, and methods of implementation must be considered in system design and construction in order to give the expected result. The implementation of the design involves segmenting the overall system design into subsystems/modules/units, which are individually designed and tested before the integration of the various subsystems. The system design is divided into:
[attachment=22307]
INTRODUCTION
The need for automatic gates has been on the increase in recent times. The system described here incorporates the use of a microprocessor as a controller in achieving the aims of this project. It is no exaggeration to say that the microprocessor has revolutionized the electronics industry and has had a remarkable impact on many aspects of our lives (1999).
GENERAL OVERVIEW OF THE SYSTEM
The research work presented here is the design and development of a microprocessor based automatic gate. As a monitoring and control system, the microprocessor was used to read in data values from the input device and interact with the outside world.
SENSOR UNIT
This module makes use of an optical sensor, specifically a light dependent resistor (photo conductive cell), whose resistance changes with the intensity of light. The type used is ORP12 and it has a dark resistance of 10MΩ. The sensor unit is shown in Figure 2. When light rays are focused on the LDR, the resistance becomes very low (0-500Ω) but when the rays are interrupted, the resistance increases to its dark resistance. The variable resistor is used to vary the sensitivity of the LDR. It is otherwise called Dark Activated Sensor.
HARDWARE AND SOFTWARE DESIGN CONSIDERATIONS
Certain specifications, parameters, and methods of implementation must be considered in system design and construction in order to give the expected result. The implementation of the design involves segmenting the overall system design into subsystems/modules/units, which are individually designed and tested before the integration of the various subsystems. The system design is divided into: