Controlling Solenoid Valve with 8051 Micro-controller :-
The main theme of this project was the use of 8051 microcontroller to get use to with its interfacing circuitry and its programming techniques. In this project our task was to develop a complete circuit to control solenoid using PC interface. Computer system is interfaced with microcontroller with the help of parallel port.
If Student feel un-availability of solenoid then they produce different voltages level, which can be connected to the solenoid later on.
This project is to develop a complete system to control Solenoid Valve System. The main part of this project is the interfacing of microcontroller to the PC and with the other devices. The data is provided by the pc to the microcontroller and this data is the provided to the DAC which generates different voltages levels according to the input given this data is the provided to the OPAM which provides us the required voltage levels.
The Main parts of the Projects, where we focus our intention will be as under:-
1. PC Parallel Port Interfacing with Microcontroller 8051
Here we will study, The Introduction of parallel ports,hardware involve in interfacing the microcontroller to parallel port, its connectors, PIN descrptions, buses used in the parallel port, programming issues and a PC side simple program.
2. Circuit designing of microcontroller board to control Solenoid Valves
Here we will study, the microcontroller 8051 hardware, microcontroller 8051 features, microcontroller 8051 ports, builtin funtions, and other hardware components used in the projects.
What method is used to interface microcontroller 8051 with parallel port, and how the solenoid valve is interface and controller with microcontroller 8051.
3. Interfacing of latch 74ls373 with microcontroller
Latch TTL 74ls373 interface with microcontroler 8051 will be studied here.
4. DAC0800 interfacing with Microcontroller for digital to analog voltage conversion
Digital to Analog converter DAC0800 is used to generate different voltages which will be then a presentation of soleniod valve control. Here will discuss the interfacing of DAC0800 with microcontroller 8051. The circuit diagram of the DAC0800 is also presented.
5. Solenoid valve function and interfacing with microcontroller 8051
Methodology of working of solenoid valve will be discussed, what are design requirements of solenoid valve, what are its inputs and what is its output, how is could be used, and which are the requirements of solenoid valve during circuit designing and software programming. A solenoid valve is an electromechanical valve for use with liquid or gas. The valve is controlled by an electric current through a solenoid coil. Solenoid valves may have two or more ports: in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow is switched between the two outlet ports. Multiple solenoid valves can be placed together on a manifold.
A solenoid valve has two main parts: the solenoid and the valve. The solenoid converts electrical energy into mechanical energy which, in turn, opens or closes the valve mechanically.Solenoid valves may use metal seals or rubber seals, and may also have electrical interfaces to allow for easy control. A spring may be used to hold the valve opened or closed while the valve is not activated.A solenoid is an electromechanical device which allows for an electrical device to control the flow of a gas or liquid. The electrical device causes a current to flow through a coil located on the solenoid valve. This current flow in turn results in a magnetic field which causes the displacement of a metal actuator. The actuator is mechanically linked to a mechanical valve inside the solenoid valve. The valve then changes state, either opening or closing to allow a liquid or gas to either flow through or be blocked by the solenoid valve. A spring is used to return the actuator and valve back to their resting state when the current flow is removed.
Factory automation makes frequent use of solenoid valves. A computer device running a factory automation program to fill a container with some liquid can send a signal to the solenoid valve to open, allowing the container to fill, and then remove the signal to close the solenoid valve and stop the flow of liquid until the next container is in place. A gripper for grasping items on a robot is frequently an air controlled device. A solenoid valve can be used to allow air pressure to close the gripper, and a second solenoid valve can be used to open the gripper. If a two way solenoid valve is used, two separate valves are not needed in this application. This means that the microcontroller is incapable of controlling the solenoid valves directly.the microcontroller was chosen for the electronic control system the group realized that it allowed for a more sophisticated control scheme. The basic concepts of the original activation schedule were adapted for use with the microcontroller to produce the final control scheme. a microcontroller it was necessary to use an interface board to relay the commands from the microcontroller to the solenoid valves. An interface board is required for several reasons, mainly that the solenoid valves operate at a different voltage and to prevent interference from the solenoid valves from damaging the microcontroller. relay switches make up the core of the interface board. Relay switches allow a low powered signal to switch a much stronger power supply on or off without requiring the signals to interact directly. They accomplish this by using the smaller control signal to energize a magnetic coil to force one end of a magnetic metal connector to switch back and forth between two terminals while its other end remains anchored to a terminal of the opposite polarity. In the relay switches used to build the interface board a small spring is used to keep the switch locked in the off position while the coil is not energized; once the coil is energized by a signal from the microcontroller the relay switches the power for solenoid valve to “on” instantaneously. While there are several other electrical components that were used to build the interface board they are minor elements that were mainly used to condition the power and the control signal used to trigger the relay switch.
Saturday, September 11, 2010
Solenoid Valve Control System Using 8051 Microcontroller
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