Ardunicko
Published © GPL3+

Residential Air Flowmeter

Have you ever wanted to measure the speed of air coming out of your vents at home? Well then we have the perfect project for you.

BeginnerFull instructions provided9,784
Residential Air Flowmeter

Things used in this project

Hardware components

Arduino UNO
Arduino UNO
×1
Jumper wires (generic)
Jumper wires (generic)
25 Wires in total
×25
Breadboard (generic)
Breadboard (generic)
×1
Rotary Potentiometer, 10 kohm
Rotary Potentiometer, 10 kohm
×1
RGB Backlight LCD - 16x2
Adafruit RGB Backlight LCD - 16x2
×1
Through Hole Resistor, 220 kohm
Through Hole Resistor, 220 kohm
×1
Diymall Voltage Sensor Dc0-25v
×1
DROK Signal Amplifier AD620
×1
Cup Blade Anemometer
×1

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)

Story

Read more

Custom parts and enclosures

Housing STL File

Fan Blade STL file

Schematics

Wiring Diagram

Code

Flowmeter Code

C/C++
1.	#include <LiquidCrystal.h>  
2.	  
3.	LiquidCrystal lcd(12, 11, 5, 4, 3, 2);                                          
4.	// These are the pins that will be used  
5.	  
6.	 // Below are the values of the resistors in the sensor 
7.	float R1=30000;                    
8.	  
9.	float R2=7500;  
10.	  
11.	void setup()   
12.	{  
13.	    
14.	Serial.begin (9600);  
15.	lcd.begin(16, 2);                                                              
16.	 // This allows the LCD screen to be used  
17.	  
18.	  
19.	}  
20.	  
21.	void loop()                                                                     
22.	// Beginning of the loop  
23.	{  
24.	    
25.	int sensorValue = analogRead(A0);                                              
26.	 // Reads  the sensor value  
27.	  
28.	float voltage = ((5*sensorValue*(R1+R2))/(1024*R2));                           
29.	 // Equation for the real voltage   
30.	  
31.	  
32.	//*********************************************************//  
33.	// The equation for CFM is a piecewise function of voltage,   
34.	// so if statements were used to divide the functions into  
35.	// their respective regions below  
36.	//*********************************************************//  
37.	  
38.	  
39.	if (voltage > 1)                                                               
40.	 // First region of the function for large CFM  
41.	{  
42.	    
43.	float cfm = (1.1409*(voltage))*((voltage))+44.258*(voltage);      
44.	  
45.	Serial.println(cfm);                                                           
46.	 // Displays CFM  
47.	lcd.print("CFM = ");  
48.	lcd.setCursor(0, 1);  
49.	lcd.print(cfm);  
50.	delay(1000);                                                                   
51.	 // 1000 ms delay  
52.	lcd.clear();                                                                   
53.	 // Clears for repeat  
54.	delay(1000);  
55.	  
56.	}  
57.	  
58.	else if (.01 < voltage < 1)                                                    
59.	 // Second region for middle to low CFM  
60.	{  
61.	  
62.	float cfm = (40*(voltage)+20);  
63.	  
64.	Serial.println(cfm);                                                           
65.	// Displays CFM  
66.	lcd.print("CFM = ");  
67.	lcd.setCursor(0, 1);  
68.	lcd.print(cfm);  
69.	delay(1000);                                                                  
70.	 // 1000 ms delay  
71.	lcd.clear();                                                                   
72.	 // Clears for repeat  
73.	delay(1000);  
74.	    
75.	}  
76.	  
77.	else                                                                           
78.	 // If fan is not spinning, the CFM will be zero  
79.	{  
80.	  float cfm = 0;  
81.	  
82.	  Serial.println(cfm);  
83.	lcd.print("CFM = ");  
84.	lcd.setCursor(0, 1);  
85.	lcd.print(cfm);  
86.	delay(1000);  
87.	lcd.clear();  
88.	delay(1000);  
89.	}  
90.	  
91.	  
92.	}

Code for Voltage Sensor

C/C++
This is the code to read the voltage if you want to calibrate it yourself
 // Below are the values of the resistors in the sensor
float R1=30000;                                                         
float R2=7500;

void setup() {

Serial.begin (9600);
 
}

void loop() {

// Reads the sensor value
int sensorValue = analogRead(A0);                                      

// Equation for the real voltage
float voltage = ((5*sensorValue*(R1+R2))/(1024*R2));                  

// Prints voltage on computer
Serial.printIn(voltage);                                              
delay(1000);
}

Voltage Sensor Code

C/C++
This is the code you use to calibrate the Flowmeter yourself.
#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);                                    // These are the pins that will be used

// Below are the values of the resistors in the sensor
float R1=30000;                                                         
float R2=7500;

void setup() 
{
  
// This allows the LCD screen to be used
Serial.begin (9600);
lcd.begin(16, 2);                                                       


}

void loop()                                                           
{
 
// Reads the sensor value  
int sensorValue = analogRead(A0);                                      

// Equation for the real voltage
float voltage = ((5*sensorValue*(R1+R2))/(1024*R2));                   


// Shows voltage on the LCD screen
Serial.println(voltage);
lcd.print("V = ");
lcd.setCursor(0, 1);
lcd.print(voltage);
delay(1000);
lcd.clear();
delay(1000);


}

Credits

Ardunicko

Ardunicko

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Related channels and tags
  • Adafruit
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  • Environmental Sensing
  • Sensors