Pressure Airflow Measure Device with Analog Sensor

I'm building working model of differential pressure airflow measure device with analog sensor, instrumentation amplifier and Arduino.

Oct 25, 2017

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Components and supplies

Arduino UNO

MPXM2053GS

Standard LCD - 16x2 White on Blue

Instrumentation Amplifier, SO-8, 100 kHz, AD623ARZ

Capacitor Ceramic 0.1uF (generic)

Electrolytic Decoupling Capacitors - 10uF (generic)

Tools and machines

Soldering iron (generic)

Project description

Code

Differential pressure to airflow speed in m/s

csharp

Measuring airflow with analog pressure sensor.

1#include <Wire.h>  
2#include <LiquidCrystal_I2C.h> 
3LiquidCrystal_I2C  lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); 
4
5float CurrentReading;
6float  Sum;
7float Average;
8float MeasuresN=2500 ; // number of measures to average
9float  Flow;
10
11void setup() 
12{
13Serial.begin(9600);
14lcd.begin(16,2); 
15}
16
17void  loop() 
18{
19for (int i=0; i<MeasuresN; i++)
20{
21CurrentReading = analogRead(A0);
22Sum+=CurrentReading;
23delay(1);
24}
25Average=Sum/MeasuresN;
26Sum=0;
27
28//  To proper measure from 0 m/s airspeed you will need to find curve equation based  on your application- I use linear equation to test on fan I had access to.
29
30////////////////////////////
31Flow=(Average-68)*0.265+2.7;   
32////////////////////////////
33
34lcd.backlight(); 
35lcd.setCursor(0,0);  
36lcd.print("Sensor:"); lcd.print(Average); 
37lcd.setCursor(0,1); 
38lcd.print("Airflow:");  lcd.print(Flow); lcd.print("m/s  ");
39  
40delay(5);
41}

#include <Wire.h>  
#include <LiquidCrystal_I2C.h> 
LiquidCrystal_I2C  lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); 

float CurrentReading;
float  Sum;
float Average;
float MeasuresN=2500 ; // number of measures to average
float  Flow;

void setup() 
{
Serial.begin(9600);
lcd.begin(16,2); 
}

void  loop() 
{
for (int i=0; i<MeasuresN; i++)
{
CurrentReading = analogRead(A0);
Sum+=CurrentReading;
delay(1);
}
Average=Sum/MeasuresN;
Sum=0;

//  To proper measure from 0 m/s airspeed you will need to find curve equation based  on your application- I use linear equation to test on fan I had access to.

////////////////////////////
Flow=(Average-68)*0.265+2.7;   
////////////////////////////

lcd.backlight(); 
lcd.setCursor(0,0);  
lcd.print("Sensor:"); lcd.print(Average); 
lcd.setCursor(0,1); 
lcd.print("Airflow:");  lcd.print(Flow); lcd.print("m/s  ");
  
delay(5);
}

Downloadable files

Pressure to airflow speed

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