Schematic Binding things together in pressure sensing project | Controller Circuit

Thursday, November 24, 2011

Schematic Binding things together in pressure sensing project

 Binding things together to complete the project or pressure monitoring using microcontroller 8051.
Let us see how these components work and how the things were titted together in order to complete the pressure sensing and monitoring projects, different components were purchased and soldered on PCB then the the circuit was tested using test points. Mean while the code or program for pressure monitoring was written for microcontroller at89s51 using assembly language. The code will be posted in the next post. All this work is described here in steps, so please click on links as much as possible to find valuable information regarding project.
Step 1:
The first step involved the testing of the pressure sensor manually. The pressure sensor was test by applying different pressures on the sensing element and displacement was watched. As we have discussed in the previous post about the construction of our developed sensor that it have cylinder which will move according to applied pressure. The movement of the cylinder is to be monitored and Microcontroller will calculate the pressure at the end.
Pressure is applied to the cylinder and the piston moves . motion of the piston is restricted by the damper.
Step 2:
As discussed in the first step that the movement of the piston is coupled with variable resistor. The movement of the piston in cylinder of pressure sensor will be checked with variable resistor. Displacement is measured by Voltage change detected across the in the linear variable resister.
Step 3:
The change in voltage due to change in resistance is the transducer in our case. This voltage is applied across the ADC. ADC converts this voltage to 1’s and 0’s form. And sent to the processing unit. The microcontroller will get digital form of these voltages for further processing.
Step 4:
In the code microcontroller 89s51, a formula is written which will convert these voltages into pressure. as we have derived this formula already and proved its working. Thus in microcontroller its calculation is not problem. The algorith to calculate the pressure from the voltages changed at the variable resistance is developed in the code. The microcontroller code will be available in the next post. Here only the calculation is discussed, that how micro-controller will do this.
Processor (Micro controller) takes output ‘x’of ADC as input and does the following calculation.
F=Ks * x
Ks is the spring constant .
P=F/A
Where A= phi *D*D/4
Where D is the diameter of the cylinder. P is the pressure that is applied on the cylinder.
Step 5:
This P is then conveyed to seven segment and computer. In this project serial communication with microcontroller a computer is done using rs232. The pressure calculated rather sensed or monitored is also transmitted to wards the computer for better processing of this parameter.
A database can also be attached to stored all monitored values and then a history graph can be draws to analysis the behaviour of the machine whose pressure is monitored here.
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