The Blowhard - HVAC Circulation Blower Assist

Rate-of-Rise triggered axial fan blowers to improve warm air circulation in a room with one HVAC inlet vent

Jun 3, 2024

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LGPL3+

Energy Efficiency

Environmental Sensing

Components and supplies

Arduino Uno Rev 3

Arduino Sensor Kit - Bundle

Arduino Motor Shield Rev3

Apps and platforms

Arduino IDE 2.0 (beta)

Project description

Code

Arduino code for The Blowhard

cpp

Code written in Arduino .ino, a superset of C++.

1// The Blowhard code - Steven Lightfoot - Version 2024-06-08 PUBLIC
2
3//*****************************oled************************************
4#include <Arduino.h>
5#include <U8g2lib.h>
6
7#ifdef U8X8_HAVE_HW_SPI
8#include <SPI.h>
9#endif
10#ifdef U8X8_HAVE_HW_I2C
11#include <Wire.h>
12#endif
13
14U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R2, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);  // High speed I2C
15                                      // THis is the oled Constructor, with some parms to modify incl: U8G2_R2 for screen rotation 180 deg
16                                      // Note: This is the HW I2C contructor
17
18                                      // Info from U8G2 on Constructors:
19                                      // https://github.com/olikraus/u8g2/wiki/u8g2setupcpp#using-dynamically-allocated-page-buffers
20               
21//*******************************oled***********************************
22
23//*******************************DHT20**********************************
24#include "DHT20.h"
25DHT20 DHT;
26//********************************DHT20**********************************
27
28//*******************************BMP280**********************************
29#include "Seeed_BMP280.h"
30#include <Wire.h>
31
32BMP280 bmp280;
33
34// #include "DHT20.h"
35// DHT20 DHT;
36//********************************BMP280**********************************
37
38
39
40// -------------------------------/
41// --------> global defines and constants
42const int dirPinA = 12;    // Arduino motor shield settings
43const int pwmPinA = 3;
44const int brakePinA = 9;
45const int dirPinB = 13;
46const int pwmPinB = 11;
47const int brakePinB = 8;
48// -------------------------------/
49
50
51
52// --------> global variables including objects
53// int button_state = 0;          // Not used in this version of The Blowhard code
54unsigned long count = 0;          // uint8_t count = 0;
55unsigned long previousTime_1 = 0;  // For Millis() timing
56const long eventTime_1_TC = 10000; //in ms, interval for measuring Temp in C
57unsigned long previousTime_2 = 0;  // For Millis() timing
58const long eventTime_2_WS = 60000; //in ms, interval for measuring data from WeatherStation (Rh and Baro)
59float temptest = 0.0;              // For Rate of Rise comparator
60// --------------------------/
61
62
63
64// --------> user defined function proottypes
65void StartWarning();
66void WeatherStation();
67void RampTestA();
68void RampTestB();
69// --------------------------------------------------------------------------------------------------------------------------------------/
70
71
72
73
74// ******************* SETUP START *************************
75void setup() {
76
77 // pinMode(6, OUTPUT);               // LED initialize, in case it is used - not used in this code
78  pinMode(5, OUTPUT);               // Start warning tones
79 // pinMode(4, INPUT);                // Start button - not used in this code
80
81  pinMode(dirPinA, OUTPUT);          // Arduino motor shield parms
82  pinMode(pwmPinA, OUTPUT);
83  pinMode(brakePinA, OUTPUT);
84
85  pinMode(dirPinB, OUTPUT);
86  pinMode(pwmPinB, OUTPUT);
87  pinMode(brakePinB, OUTPUT);
88
89 // pinMode(A0, INPUT);                // For Arduino Motor Shield Current Sending, Not used in this code
90 // pinMode(A1, INPUT);                // For Arduino Motor Shield Current Sending, Not used in this code
91
92  Serial.begin(9600);
93
94 //**************BMP280***************
95//  if(!bmp280.init()){
96//    Serial.println("Device error!");
97
98  bmp280.init();              // inserted this on speculation, and it seemd to have initialized and started data flowing
99
100  Wire.begin();               // this begin may be redundant
101//  DHT.begin();    //  ESP32 default pins 21 22
102//**************BMP280***************
103 
104//**************oled****************
105  u8g2.begin();
106  u8g2.enableUTF8Print();		// enable UTF8 support for the Arduino print() function
107//**************oled****************
108
109//**************DHT20***************
110  Wire.begin();
111  DHT.begin();    //  ESP32 default pins 21 22
112//**************DHT20***************
113
114 }
115// ******************** SETUP END **************************
116
117
118
119// ********************************************* MAIN START ****************************************************************
120void loop() {
121
122  unsigned long currentTime = millis();
123
124  if ( currentTime - previousTime_1 >= eventTime_1_TC) // Check and display temp every 10 secs and do Rate-of-Rise check
125  
126                        {  count++;
127    
128                        // ********DHT20 related code **************
129                         int status = DHT.read();      
130                         float T = DHT.getTemperature();
131                        // ********DHT20 related code **************
132                      
133                         //***********oled relate code *************
134                          u8g2.firstPage();
135                          do {  u8g2.setFont(u8g2_font_spleen32x64_mr);
136                                u8g2.setFontDirection(0);
137                                u8g2.drawStr(0,52,"Tc");
138                                u8g2.setCursor(64, 52);
139                                u8g2.print(T, 0);
140                                u8g2.sendBuffer();
141                                u8g2.clearBuffer();
142                                delay(1000);
143                            } while ( u8g2.nextPage() );
144                                u8g2.clearBuffer();
145                                u8g2.sendBuffer();
146                        //***********oled relate code *************
147                       
148                        previousTime_1 = currentTime;
149
150                        if ( T - temptest > 2.0 && count >1 ) // Rate-of-Rise check - count variable ensures if statement is false on first iteration
151                        
152                        { StartWarning(); RampTestA(); RampTestB(); RampTestA(); RampTestB(); RampTestA(); RampTestB(); } 
153                         
154                        temptest = T;
155                          
156                        }
157
158
159   if ( currentTime - previousTime_2 >= eventTime_2_WS) // Run Weather Station fuction every 60 secs (ie display Rh and Baro)
160   
161                        {
162                        
163                        WeatherStation();
164  
165                        previousTime_2 = currentTime;
166
167                        }
168}
169
170// ********************************************** MAIN END ******************************************************************
171
172
173
174// ** begin *********************** RampTestA ************************************
175void RampTestA()
176{ digitalWrite(dirPinA, HIGH);                // Set direction pin HIGH to establish which direction this is in real life (counter-clockwise Pilot View)
177  digitalWrite(brakePinA, LOW);               // confirm motorbrake is OFF
178  analogWrite(pwmPinA, 60); delay(3000);      // Start run
179  for (int i = 60; i < 120; i++) { analogWrite(pwmPinA, i); delay(75); }    // Accelerate forward
180  delay(14000);
181  for (int i = 120; i >= 30; i--) { analogWrite(pwmPinA, i); delay(75); }   // Decelerate forward
182  delay(2000);
183  analogWrite(pwmPinA, 0); }
184// *** end ************************ RampTestA ************************************
185
186
187
188// ** begin *********************** RampTestB ************************************
189void RampTestB()
190{ digitalWrite(dirPinB, HIGH);                // Set direction pin HIGH to establish which direction this is in real life (counter-clockwise Pilot View)
191  digitalWrite(brakePinB, LOW);               // confirm motorbrake is OFF
192  analogWrite(pwmPinB, 60);  delay(3000);
193  for (int i = 60; i < 120; i++) { analogWrite(pwmPinB, i); delay(75); }  // Accelerate forward
194  delay(14000);
195  for (int i = 120; i >= 30; i--) { analogWrite(pwmPinB, i); delay(75); }  // Decelerate forward
196  delay(2000);
197  analogWrite(pwmPinB, 0); }
198// *** end ************************ RampTestB ************************************
199
200
201
202// ** begin *********************** Function StartWarning ************************************
203
204void StartWarning()
205
206{
207  tone(5, 175); //Set the voltage to high and makes a noise
208  delay(800);//Waits for 1000 milliseconds
209 
210  tone(5, 494); //Set the voltage to high and makes a noise
211  delay(800);//Waits for 1000 milliseconds
212  
213  tone(5, 740); //Set the voltage to high and makes a noise
214  delay(800);//Waits for 1000 milliseconds
215  noTone(5);//Sets the voltage to low and makes no noise
216 }
217// *** end ************************ Function StartWarning ************************************
218
219
220
221// ** begin *********************** Function WeatherStation **********************************
222
223void WeatherStation()
224
225{
226
227//********DHT20 related code **************
228int status = DHT.read();                                // A read has to be executed to get a reading, the variable status is filled but never used
229float RH = DHT.getHumidity();                           // get RH
230float T = DHT.getTemperature();                         // get T C
231//********DHT20 related code **************
232
233//********BMP280 related code **************
234
235// float temp = bmp280.getTemperature();
236float pressure = bmp280.getPressure();
237
238float PressCorrhPa = (pressure/100.) + 12.973;        // 12.973 hPa is the Sea Level correction for 15 Goldridge at 107 MASL
239                                                    // https://en-ca.topographic-map.com/map-p6dmt/Ottawa/
240                                                    // http://www.csgnetwork.com/barcorrecthcalc.html (I used this correction)
241                                                    // another resource: https://www.engineeringtoolbox.com/barometers-elevation-compensation-d_1812.html
242
243
244//********BMP280 related code **************
245
246//***********oled relate code *************
247  u8g2.firstPage();                             // https://github.com/olikraus/u8g2/wiki/u8g2reference#firstpage
248
249  do {
250        u8g2.setFont(u8g2_font_spleen32x64_mr);          // 15 pixel height, letters and numbers - u8g2_font_ncenB14_tr - lucida
251                                                // 19 pixel height, letters and numbers - u8g2_font_luRS19_te - lucida
252                                                // 40 pixelheight, letters Ucase and Lcase and numbers - u8g2_font_spleen32x64_mr - spleen
253
254        u8g2.setFontDirection(0);               // https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontdirection  
255
256        u8g2.drawStr(0,52,"Rh");
257        u8g2.setCursor(64, 52);     // set position x,y for print
258        u8g2.print(RH, 0);          // print float with zero decimal places                
259
260        u8g2.sendBuffer();            // send to screen
261        u8g2.clearBuffer();
262        delay(2000);
263
264        u8g2.drawStr(0,52,"Baro");
265        u8g2.sendBuffer();            // send to screen
266        u8g2.clearBuffer();
267        delay(500);
268
269        u8g2.drawStr(0,52,"Corr");
270        u8g2.sendBuffer();            // send to screen
271        u8g2.clearBuffer();
272        delay(500);
273
274        u8g2.drawStr(0,52," hPa");    
275
276        u8g2.sendBuffer();            // send to screen
277        u8g2.clearBuffer();
278        delay(500);
279
280        u8g2.setCursor(0, 52);     // set position x,y for print
281        u8g2.print(PressCorrhPa, 0);          // print float with zero decimal places       
282
283        u8g2.sendBuffer();            // send to screen
284        u8g2.clearBuffer();
285        delay(2000);
286    
287  } while ( u8g2.nextPage() );                  // https://github.com/olikraus/u8g2/wiki/u8g2reference#nextpage
288
289        u8g2.clearBuffer();
290        u8g2.sendBuffer();
291        //delay(1000);
292
293//***********oled relate code *************
294  
295}
296
297// ** end ****************************** Function WeatherStation **********************************

// The Blowhard code - Steven Lightfoot - Version 2024-06-08 PUBLIC

//*****************************oled************************************
#include <Arduino.h>
#include <U8g2lib.h>

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R2, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE);  // High speed I2C
                                      // THis is the oled Constructor, with some parms to modify incl: U8G2_R2 for screen rotation 180 deg
                                      // Note: This is the HW I2C contructor

                                      // Info from U8G2 on Constructors:
                                      // https://github.com/olikraus/u8g2/wiki/u8g2setupcpp#using-dynamically-allocated-page-buffers
               
//*******************************oled***********************************

//*******************************DHT20**********************************
#include "DHT20.h"
DHT20 DHT;
//********************************DHT20**********************************

//*******************************BMP280**********************************
#include "Seeed_BMP280.h"
#include <Wire.h>

BMP280 bmp280;

// #include "DHT20.h"
// DHT20 DHT;
//********************************BMP280**********************************



// -------------------------------/
// --------> global defines and constants
const int dirPinA = 12;    // Arduino motor shield settings
const int pwmPinA = 3;
const int brakePinA = 9;
const int dirPinB = 13;
const int pwmPinB = 11;
const int brakePinB = 8;
// -------------------------------/



// --------> global variables including objects
// int button_state = 0;          // Not used in this version of The Blowhard code
unsigned long count = 0;          // uint8_t count = 0;
unsigned long previousTime_1 = 0;  // For Millis() timing
const long eventTime_1_TC = 10000; //in ms, interval for measuring Temp in C
unsigned long previousTime_2 = 0;  // For Millis() timing
const long eventTime_2_WS = 60000; //in ms, interval for measuring data from WeatherStation (Rh and Baro)
float temptest = 0.0;              // For Rate of Rise comparator
// --------------------------/



// --------> user defined function proottypes
void StartWarning();
void WeatherStation();
void RampTestA();
void RampTestB();
// --------------------------------------------------------------------------------------------------------------------------------------/




// ******************* SETUP START *************************
void setup() {

 // pinMode(6, OUTPUT);               // LED initialize, in case it is used - not used in this code
  pinMode(5, OUTPUT);               // Start warning tones
 // pinMode(4, INPUT);                // Start button - not used in this code

  pinMode(dirPinA, OUTPUT);          // Arduino motor shield parms
  pinMode(pwmPinA, OUTPUT);
  pinMode(brakePinA, OUTPUT);

  pinMode(dirPinB, OUTPUT);
  pinMode(pwmPinB, OUTPUT);
  pinMode(brakePinB, OUTPUT);

 // pinMode(A0, INPUT);                // For Arduino Motor Shield Current Sending, Not used in this code
 // pinMode(A1, INPUT);                // For Arduino Motor Shield Current Sending, Not used in this code

  Serial.begin(9600);

 //**************BMP280***************
//  if(!bmp280.init()){
//    Serial.println("Device error!");

  bmp280.init();              // inserted this on speculation, and it seemd to have initialized and started data flowing

  Wire.begin();               // this begin may be redundant
//  DHT.begin();    //  ESP32 default pins 21 22
//**************BMP280***************
 
//**************oled****************
  u8g2.begin();
  u8g2.enableUTF8Print();		// enable UTF8 support for the Arduino print() function
//**************oled****************

//**************DHT20***************
  Wire.begin();
  DHT.begin();    //  ESP32 default pins 21 22
//**************DHT20***************

 }
// ******************** SETUP END **************************



// ********************************************* MAIN START ****************************************************************
void loop() {

  unsigned long currentTime = millis();

  if ( currentTime - previousTime_1 >= eventTime_1_TC) // Check and display temp every 10 secs and do Rate-of-Rise check
  
                        {  count++;
    
                        // ********DHT20 related code **************
                         int status = DHT.read();      
                         float T = DHT.getTemperature();
                        // ********DHT20 related code **************
                      
                         //***********oled relate code *************
                          u8g2.firstPage();
                          do {  u8g2.setFont(u8g2_font_spleen32x64_mr);
                                u8g2.setFontDirection(0);
                                u8g2.drawStr(0,52,"Tc");
                                u8g2.setCursor(64, 52);
                                u8g2.print(T, 0);
                                u8g2.sendBuffer();
                                u8g2.clearBuffer();
                                delay(1000);
                            } while ( u8g2.nextPage() );
                                u8g2.clearBuffer();
                                u8g2.sendBuffer();
                        //***********oled relate code *************
                       
                        previousTime_1 = currentTime;

                        if ( T - temptest > 2.0 && count >1 ) // Rate-of-Rise check - count variable ensures if statement is false on first iteration
                        
                        { StartWarning(); RampTestA(); RampTestB(); RampTestA(); RampTestB(); RampTestA(); RampTestB(); } 
                         
                        temptest = T;
                          
                        }


   if ( currentTime - previousTime_2 >= eventTime_2_WS) // Run Weather Station fuction every 60 secs (ie display Rh and Baro)
   
                        {
                        
                        WeatherStation();
  
                        previousTime_2 = currentTime;

                        }
}

// ********************************************** MAIN END ******************************************************************



// ** begin *********************** RampTestA ************************************
void RampTestA()
{ digitalWrite(dirPinA, HIGH);                // Set direction pin HIGH to establish which direction this is in real life (counter-clockwise Pilot View)
  digitalWrite(brakePinA, LOW);               // confirm motorbrake is OFF
  analogWrite(pwmPinA, 60); delay(3000);      // Start run
  for (int i = 60; i < 120; i++) { analogWrite(pwmPinA, i); delay(75); }    // Accelerate forward
  delay(14000);
  for (int i = 120; i >= 30; i--) { analogWrite(pwmPinA, i); delay(75); }   // Decelerate forward
  delay(2000);
  analogWrite(pwmPinA, 0); }
// *** end ************************ RampTestA ************************************



// ** begin *********************** RampTestB ************************************
void RampTestB()
{ digitalWrite(dirPinB, HIGH);                // Set direction pin HIGH to establish which direction this is in real life (counter-clockwise Pilot View)
  digitalWrite(brakePinB, LOW);               // confirm motorbrake is OFF
  analogWrite(pwmPinB, 60);  delay(3000);
  for (int i = 60; i < 120; i++) { analogWrite(pwmPinB, i); delay(75); }  // Accelerate forward
  delay(14000);
  for (int i = 120; i >= 30; i--) { analogWrite(pwmPinB, i); delay(75); }  // Decelerate forward
  delay(2000);
  analogWrite(pwmPinB, 0); }
// *** end ************************ RampTestB ************************************



// ** begin *********************** Function StartWarning ************************************

void StartWarning()

{
  tone(5, 175); //Set the voltage to high and makes a noise
  delay(800);//Waits for 1000 milliseconds
 
  tone(5, 494); //Set the voltage to high and makes a noise
  delay(800);//Waits for 1000 milliseconds
  
  tone(5, 740); //Set the voltage to high and makes a noise
  delay(800);//Waits for 1000 milliseconds
  noTone(5);//Sets the voltage to low and makes no noise
 }
// *** end ************************ Function StartWarning ************************************



// ** begin *********************** Function WeatherStation **********************************

void WeatherStation()

{

//********DHT20 related code **************
int status = DHT.read();                                // A read has to be executed to get a reading, the variable status is filled but never used
float RH = DHT.getHumidity();                           // get RH
float T = DHT.getTemperature();                         // get T C
//********DHT20 related code **************

//********BMP280 related code **************

// float temp = bmp280.getTemperature();
float pressure = bmp280.getPressure();

float PressCorrhPa = (pressure/100.) + 12.973;        // 12.973 hPa is the Sea Level correction for 15 Goldridge at 107 MASL
                                                    // https://en-ca.topographic-map.com/map-p6dmt/Ottawa/
                                                    // http://www.csgnetwork.com/barcorrecthcalc.html (I used this correction)
                                                    // another resource: https://www.engineeringtoolbox.com/barometers-elevation-compensation-d_1812.html


//********BMP280 related code **************

//***********oled relate code *************
  u8g2.firstPage();                             // https://github.com/olikraus/u8g2/wiki/u8g2reference#firstpage

  do {
        u8g2.setFont(u8g2_font_spleen32x64_mr);          // 15 pixel height, letters and numbers - u8g2_font_ncenB14_tr - lucida
                                                // 19 pixel height, letters and numbers - u8g2_font_luRS19_te - lucida
                                                // 40 pixelheight, letters Ucase and Lcase and numbers - u8g2_font_spleen32x64_mr - spleen

        u8g2.setFontDirection(0);               // https://github.com/olikraus/u8g2/wiki/u8g2reference#setfontdirection  

        u8g2.drawStr(0,52,"Rh");
        u8g2.setCursor(64, 52);     // set position x,y for print
        u8g2.print(RH, 0);          // print float with zero decimal places                

        u8g2.sendBuffer();            // send to screen
        u8g2.clearBuffer();
        delay(2000);

        u8g2.drawStr(0,52,"Baro");
        u8g2.sendBuffer();            // send to screen
        u8g2.clearBuffer();
        delay(500);

        u8g2.drawStr(0,52,"Corr");
        u8g2.sendBuffer();            // send to screen
        u8g2.clearBuffer();
        delay(500);

        u8g2.drawStr(0,52," hPa");    

        u8g2.sendBuffer();            // send to screen
        u8g2.clearBuffer();
        delay(500);

        u8g2.setCursor(0, 52);     // set position x,y for print
        u8g2.print(PressCorrhPa, 0);          // print float with zero decimal places       

        u8g2.sendBuffer();            // send to screen
        u8g2.clearBuffer();
        delay(2000);
    
  } while ( u8g2.nextPage() );                  // https://github.com/olikraus/u8g2/wiki/u8g2reference#nextpage

        u8g2.clearBuffer();
        u8g2.sendBuffer();
        //delay(1000);

//***********oled relate code *************
  
}

// ** end ****************************** Function WeatherStation **********************************

Documentation

EUDAX size 130 DC motors and fans

Eudax 130 DC motor and prop set.png

Power Supply used

Power supply Stated 6 VDC Actual 8 VDC 800 mA limit.png

The Blowhard closeup 1

The Blowhard closeup 1.png

The Blowhard closeup 2

The Blowhard closeup 2.png

The Blowhard closeup 3

The Blowhard closeup 3.png

The Blowhard iso view

The Blowhard iso view.png

The Blowhard oled SSD1315 U8g2 constructor information

The Blowhard oled SSD1315 U8g2 contructor information.png

The Blowhard overall view during fan-motor B testing

The Blowhard overall view during fan-motor B testing.png

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