ماژول سنجش فشار هوا MPS20N0040D

Pressure Sensor MPS20N0040D-S
The MPS20N0040D-S Barometric Pressure Sensor Module is capable of detecting and measuring air pressure between 0 and 40 kilo pascals (KPa), as well as water level.
The main element of the module is a MPS20N0040D-S sensor which converts pressure measurements into analog signals and can be connected to a 2.5mm diameter hose (Not included).
It also contains an HX710B integrated circuit that is a high-precision, 24-bit analog-to-digital converter (ADC) with an internal temperature sensor.
The MPS20N0040D-S Barometric Pressure Sensor Module is ideal for vacuum cleaners, detecting suction and water level changes, measuring changes in air pressure, pressure valves and much more.
Pressure range :0-5 .8 psi (40kpa);
Product Features
Solid, MEMS technology, high reliability
Low cost
Wide monitoring and control media
The application of a wide temperature range
Easy to use, choose from a variety of range. Easy to use, easy to install in OEM equipment
Application areas
Automotive: tire pressure, car air pump, MAP sensor, diagnostic equipment, automotive sensors.
Industry: Air brake switch, portable pressure gauge, such as digital pressure gauge,
environmental monitoring, consumer and sports
Health care: patient monitoring and diagnostic equipment, such as blood pressure monitors,
medical instrumentation and monitoring
Specifications
Range: 40kpa (differential pressure)
Output: mV signal
Electricity supply: 5VDC or constant current 1Ma
Linear accuracy: 0.25% FS
Measure the pressure range of 580 PSIG, 40KPaG
Max pressure capacity of three times the measuring range
Work power supply 5 VDC,
Input impedance of 4 – 6 KΩ
The output impedance of 4 – 6 KΩ
Operating temperature -40 – 85 ° C -40 ° F – +185 ° F
Storage Temperature -40 – 125 ° C -40 ° the F – +257 ° F
Accessible media, clean, dry, non-corrosive gases
Bias voltage ± 25 mV
Full-scale output voltage 50 – 100 mV
Bridge Resistance to 4 – 6 KΩ
Linearity ± 0.3% F.S.
Hysteresis ± 0.7% F.S.
Bias Temperature coefficient ± 0.08% of F.S. / °c
Temperature coefficient of sensitivity -0.21 % FS/ °c
How to use the Barometric Pressure Sensor Module?
The MPS20N0040D-S sensor internally contains a Wheatstone bridge that allows analog measurements to be obtained at the sensor output.
It has an approximate sensitivity of 50mV/40kPa, however depending on the sensor this sensitivity may be different.
The module contains an HX711 integrated circuit that converts these analog measurements obtained from the sensor into digital ones.
In order to obtain the value of these measurements we will use an Arduino UNO and the HX711 library.
This library allows the HX711 to communicate with the arduino using only two terminals ( It is not the I2C protocol).

Once the library is installed in the Arduino IDE, we will use the following code

#include < Q2HX711 .h>

const byte MPS_OUT_pin = 2; // Output data pin
 const byte MPS_SCK_pin = 3; // Clock data pin
 int num_samples = 50; // Number of samples

Q2HX711 MPS20N0040D(MPS_OUT_pin, MPS_SCK_pin); // Start of HX710B communication

void setup() {
  Serial.begin(9600); // Serial port start at 9600 Baud
}

void loop() {
  float average = 0.0; // variable to average the measured values
  for (int i=0;i<num_samples;i++){
    average += MPS20N0040D.read(); // Sum several measured values ​​of the ADC
    delay(50); // Delay between measurements
  }
  average /= num_samples;
  Serial.println(num_samples,0); // Print the average of samples
}

Connection Diagram With Arduino

Through the serial port you can view the data obtained with the sensor.
It should be noted that this value is measurements obtained from the ADC, to obtain the equivalent value of the pressure you must make a conversion relating the measured value to the pressure supplied to the sensor.