Table of Contents
- Project Introduction
- Getting Started
- Calibrating the MPX2050DP Pressure Sensor
- Calculations and Noise Reduction
- Using Vivado and Testing the System
- Project Report Updated
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Project Introduction
Main Goal: In this project I'm going to Measure the Water Level of a tank using a pressure sensor (MPX2050DP) and the Digilent Cmod S7 board.
Liquid-level monitoring plays an important role in today’s automotive, oil, water, pressure, and gas industries, to name a few. For example, pumping oil into a storage tank requires liquid-level monitoring to prevent spillage. Draining liquid out of a silo into bottles also requires liquid-level monitoring for volume control.
In this project I'm going to discuss one of the cheapest ways to measure the level of a tank by means of a differential pressure sensor. We already know what pressure is, the different pressures that exist and above all that the level and flow can be derived from a pressure measurement. For example, to measure level we have to:
ΔP=PH−PL=ρgh
Despite not using a water level sensor in this project, it's possible to perform level measurement using another feature of physics by means of an air differential pressure sensor with the Digilent Cmod S7 board.
How does it works?
- Essentially, the pressure sensor is a Wheatstone bridge. Changes to the pressure on the bridge are analogous to the changes in the value of the bridge’s resistors.
- The height of liquid in a container can be measured using a pressure sensor. Placed at the top of the container, the pressure sensor is connected to an open-ended tube that is submerged in the container. Th e amount of water in the container exerts a proportional amount of pressure on the sensor via the trapped air in the tube. At its output, the sensor produces a pressure-equivalent voltage.
- I'm going to develop a liquid monitoring system using a pressure sensor. Since obtaining the pressure is just one vital piece of the information, how to convert the sensor’s output voltage into the liquid’s height using the analog-to-digital converter (ADC) of the Digilent Cmod S7 board will also be explained. Details of the pressure sensor, ADC connections, system calibration and calculations, as well as an example application, will be available to guide designers.
SCHEMATIC DIAGRAM
HARDWARE:
- Digilent Cmod S7
- MPX2050DP Pressure Sensor
- LMC660 Amplifier
- Resistors
- Display
SOFTWARE:
- Vivado Design Suite
