Drive an Old PC Fan with Arduino

Do you want to drive an old PC fan for your Arduino projects? Follow this small tutorial and you will know how!

Nov 21, 2020

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recycling

Devices & Components

Arduino Nano

Recycled PC FAN

Breadboard (generic)

12V Generic Power Supply

Rotary Encoder with Push-Button

Jumper wires (generic)

IC2 OLED Display

Project description

Code

Arduino PC FAN Control

arduino

Software that allows to control the speed of an old PC FAN with a Rotary Encoder.

1#include <RotaryEncoder.h>
2#include <U8glib.h>
3
4// ----- Rotary   settings here ----
5#define ROTARYSTEPS 1
6#define ROTARYMIN 80
7#define ROTARYMAX   255
8
9#define FANPIN 3
10
11// Setup a RoraryEncoder for pins A2 and A3:
12RotaryEncoder   encoder(A2, A3);
13
14U8GLIB_SSD1306_128X32 u8g(U8G_I2C_OPT_NONE);  // I2C / TWI
15
16int   pos=0;
17char Potenza[5];
18
19 
20void setup() {
21  // put your setup code   here, to run once:
22  
23  Serial.begin(115200);
24  Serial.println("Fan test   with Encoder:");
25
26  encoder.setPosition(0 / ROTARYSTEPS); // start with the   value of 0
27  analogWrite(FANPIN, 0);
28  u8g.setColorIndex(1);         // pixel   on for Display 
29
30
31}
32
33void loop() {
34  // put your main code here,   to run repeatedly:
35
36 encoder.tick();
37
38  int newPos = encoder.getPosition();
39   if (pos != newPos) {
40
41    if (newPos < ROTARYMIN) {
42    encoder.setPosition(ROTARYMIN   / ROTARYSTEPS);
43    newPos = ROTARYMIN;
44    } else if (newPos > ROTARYMAX)   {
45      encoder.setPosition(ROTARYMAX / ROTARYSTEPS);
46      newPos = ROTARYMAX;
47     }
48    sprintf(Potenza, "%d", newPos);
49    u8g.firstPage();  
50    do   {
51      draw("Power:", 0, 12);
52      draw(Potenza, 90, 12);
53    } while(   u8g.nextPage() );
54    
55   analogWrite(FANPIN, newPos);
56   Serial.println(newPos);
57    pos=newPos;  
58 }
59}
60
61
62void draw(char* parola, int posx, int posy)   {
63  // graphic commands to redraw the complete screen should be placed here  
64   u8g.setFont(u8g_font_unifont);
65  //u8g.setFont(u8g_font_osb21);
66  u8g.drawStr(   posx, posy, parola);
67}
68

#include <RotaryEncoder.h>
#include <U8glib.h>

// ----- Rotary   settings here ----
#define ROTARYSTEPS 1
#define ROTARYMIN 80
#define ROTARYMAX   255

#define FANPIN 3

// Setup a RoraryEncoder for pins A2 and A3:
RotaryEncoder   encoder(A2, A3);

U8GLIB_SSD1306_128X32 u8g(U8G_I2C_OPT_NONE);  // I2C / TWI

int   pos=0;
char Potenza[5];

 
void setup() {
  // put your setup code   here, to run once:
  
  Serial.begin(115200);
  Serial.println("Fan test   with Encoder:");

  encoder.setPosition(0 / ROTARYSTEPS); // start with the   value of 0
  analogWrite(FANPIN, 0);
  u8g.setColorIndex(1);         // pixel   on for Display 


}

void loop() {
  // put your main code here,   to run repeatedly:

 encoder.tick();

  int newPos = encoder.getPosition();
   if (pos != newPos) {

    if (newPos < ROTARYMIN) {
    encoder.setPosition(ROTARYMIN   / ROTARYSTEPS);
    newPos = ROTARYMIN;
    } else if (newPos > ROTARYMAX)   {
      encoder.setPosition(ROTARYMAX / ROTARYSTEPS);
      newPos = ROTARYMAX;
     }
    sprintf(Potenza, "%d", newPos);
    u8g.firstPage();  
    do   {
      draw("Power:", 0, 12);
      draw(Potenza, 90, 12);
    } while(   u8g.nextPage() );
    
   analogWrite(FANPIN, newPos);
   Serial.println(newPos);
    pos=newPos;  
 }
}


void draw(char* parola, int posx, int posy)   {
  // graphic commands to redraw the complete screen should be placed here  
   u8g.setFont(u8g_font_unifont);
  //u8g.setFont(u8g_font_osb21);
  u8g.drawStr(   posx, posy, parola);
}

Arduino PC FAN Control

arduino

Software that allows to control the speed of an old PC FAN with a Rotary Encoder.

1#include <RotaryEncoder.h>
2#include <U8glib.h>
3
4// ----- Rotary  settings here ----
5#define ROTARYSTEPS 1
6#define ROTARYMIN 80
7#define ROTARYMAX  255
8
9#define FANPIN 3
10
11// Setup a RoraryEncoder for pins A2 and A3:
12RotaryEncoder  encoder(A2, A3);
13
14U8GLIB_SSD1306_128X32 u8g(U8G_I2C_OPT_NONE);  // I2C / TWI
15
16int  pos=0;
17char Potenza[5];
18
19 
20void setup() {
21  // put your setup code  here, to run once:
22  
23  Serial.begin(115200);
24  Serial.println("Fan test  with Encoder:");
25
26  encoder.setPosition(0 / ROTARYSTEPS); // start with the  value of 0
27  analogWrite(FANPIN, 0);
28  u8g.setColorIndex(1);         // pixel  on for Display 
29
30
31}
32
33void loop() {
34  // put your main code here,  to run repeatedly:
35
36 encoder.tick();
37
38  int newPos = encoder.getPosition();
39  if (pos != newPos) {
40
41    if (newPos < ROTARYMIN) {
42    encoder.setPosition(ROTARYMIN  / ROTARYSTEPS);
43    newPos = ROTARYMIN;
44    } else if (newPos > ROTARYMAX)  {
45      encoder.setPosition(ROTARYMAX / ROTARYSTEPS);
46      newPos = ROTARYMAX;
47    }
48    sprintf(Potenza, "%d", newPos);
49    u8g.firstPage();  
50    do  {
51      draw("Power:", 0, 12);
52      draw(Potenza, 90, 12);
53    } while(  u8g.nextPage() );
54    
55   analogWrite(FANPIN, newPos);
56   Serial.println(newPos);
57   pos=newPos;  
58 }
59}
60
61
62void draw(char* parola, int posx, int posy)  {
63  // graphic commands to redraw the complete screen should be placed here  
64  u8g.setFont(u8g_font_unifont);
65  //u8g.setFont(u8g_font_osb21);
66  u8g.drawStr(  posx, posy, parola);
67}
68

#include <RotaryEncoder.h>
#include <U8glib.h>

// ----- Rotary  settings here ----
#define ROTARYSTEPS 1
#define ROTARYMIN 80
#define ROTARYMAX  255

#define FANPIN 3

// Setup a RoraryEncoder for pins A2 and A3:
RotaryEncoder  encoder(A2, A3);

U8GLIB_SSD1306_128X32 u8g(U8G_I2C_OPT_NONE);  // I2C / TWI

int  pos=0;
char Potenza[5];

 
void setup() {
  // put your setup code  here, to run once:
  
  Serial.begin(115200);
  Serial.println("Fan test  with Encoder:");

  encoder.setPosition(0 / ROTARYSTEPS); // start with the  value of 0
  analogWrite(FANPIN, 0);
  u8g.setColorIndex(1);         // pixel  on for Display 


}

void loop() {
  // put your main code here,  to run repeatedly:

 encoder.tick();

  int newPos = encoder.getPosition();
  if (pos != newPos) {

    if (newPos < ROTARYMIN) {
    encoder.setPosition(ROTARYMIN  / ROTARYSTEPS);
    newPos = ROTARYMIN;
    } else if (newPos > ROTARYMAX)  {
      encoder.setPosition(ROTARYMAX / ROTARYSTEPS);
      newPos = ROTARYMAX;
    }
    sprintf(Potenza, "%d", newPos);
    u8g.firstPage();  
    do  {
      draw("Power:", 0, 12);
      draw(Potenza, 90, 12);
    } while(  u8g.nextPage() );
    
   analogWrite(FANPIN, newPos);
   Serial.println(newPos);
   pos=newPos;  
 }
}


void draw(char* parola, int posx, int posy)  {
  // graphic commands to redraw the complete screen should be placed here  
  u8g.setFont(u8g_font_unifont);
  //u8g.setFont(u8g_font_osb21);
  u8g.drawStr(  posx, posy, parola);
}

Downloadable files

Arduino PC FAN control

It's a Fritzing breadboard schematic

Arduino PC FAN control

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