Easy Peasy Tachometer

Easy peasy reliable tachometer, that you can use to measure the rpm of tools, bicycle wheels, and robots using inexpensive parts.

Jan 18, 2020

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data collection

monitoring

robots

Devices & Components

Arduino Uno Rev3

Graphic OLED, 128 x 64

3144 Hall Sensor

Project description

Code

Easy Peasy Tachometer

arduino

It is a home made reliable tachometer, that can be used with an Arduino UNO or NANO that you can use to measure the speed of rotating objects on tools, bicycles, and robotics. For a complete tutorial follow this link https://youtu.be/2-J4f8-RX90

1// Easy Peasy Tachometer
2//James Rovere 2020
3#include <Wire.h>
4#include  <Adafruit_SSD1306.h>// You may have to edit library for 128x64,
5//  default is  128 x 32.
6
7#define OLED_WIDTH 128
8#define OLED_HEIGHT 64
9
10#define  OLED_ADDR   0x3C // A very common address for these displays.
11
12Adafruit_SSD1306  display(OLED_WIDTH, OLED_HEIGHT);
13
14
15float value=0;
16float rev=0;
17int  rpm;
18int oldtime=0;        
19int time;
20
21void isr()          //interrupt  service routine
22{
23rev++;
24}
25
26void setup()
27{
28 display.begin(SSD1306_SWITCHCAPVCC,  OLED_ADDR);
29 display.clearDisplay();
30   
31digitalWrite(2 ,HIGH);// Instead  of using a pull up resistor
32attachInterrupt(0,isr,RISING);  //attaching the interrupt
33
34}
35
36void  loop()
37{
38delay(2000);// 2 second delay
39detachInterrupt(0);           //detaches  the interrupt while calculating
40time=millis()-oldtime;        //finds the time  
41rpm=(rev/time)*60000;         //calculates rpm
42oldtime=millis();             //saves  the current time
43rev=0;
44
45  display.clearDisplay();
46  display.setTextSize(2);
47  display.setTextColor(WHITE);
48  display.setCursor(0, 0);// Vertical, Horizontal.
49  display.println("RPM:");
50  display.setTextSize(5);
51  display.setTextColor(WHITE);
52  display.setCursor(0,25);
53  display.println(rpm); 
54  display.display();
55  
56
57  attachInterrupt(0,isr,RISING);
58
59
60}

// Easy Peasy Tachometer
//James Rovere 2020
#include <Wire.h>
#include  <Adafruit_SSD1306.h>// You may have to edit library for 128x64,
//  default is  128 x 32.

#define OLED_WIDTH 128
#define OLED_HEIGHT 64

#define  OLED_ADDR   0x3C // A very common address for these displays.

Adafruit_SSD1306  display(OLED_WIDTH, OLED_HEIGHT);


float value=0;
float rev=0;
int  rpm;
int oldtime=0;        
int time;

void isr()          //interrupt  service routine
{
rev++;
}

void setup()
{
 display.begin(SSD1306_SWITCHCAPVCC,  OLED_ADDR);
 display.clearDisplay();
   
digitalWrite(2 ,HIGH);// Instead  of using a pull up resistor
attachInterrupt(0,isr,RISING);  //attaching the interrupt

}

void  loop()
{
delay(2000);// 2 second delay
detachInterrupt(0);           //detaches  the interrupt while calculating
time=millis()-oldtime;        //finds the time  
rpm=(rev/time)*60000;         //calculates rpm
oldtime=millis();             //saves  the current time
rev=0;

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0, 0);// Vertical, Horizontal.
  display.println("RPM:");
  display.setTextSize(5);
  display.setTextColor(WHITE);
  display.setCursor(0,25);
  display.println(rpm); 
  display.display();
  

  attachInterrupt(0,isr,RISING);


}

Easy Peasy Tachometer

arduino

It is a home made reliable tachometer, that can be used with an Arduino Uno or Nano that you can make to measure the speed of rotating objects on tools, bicycles, and robotics.

1// Easy Peasy Tachometer
2//James Rovere 2020
3#include <Wire.h>
4#include   <Adafruit_SSD1306.h>// You may have to edit library for 128x64, //default is 128   x 32.
5
6#define OLED_WIDTH 128
7#define OLED_HEIGHT 64
8
9#define OLED_ADDR    0x3C // A very common address for these displays.
10
11Adafruit_SSD1306 display(OLED_WIDTH,   OLED_HEIGHT);
12
13
14float value=0;
15float rev=0;
16int rpm;
17int oldtime=0;         
18int time;
19
20void isr()          //interrupt service routine
21{
22rev++;
23}
24
25void   setup()
26{
27 display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
28 display.clearDisplay();
29    
30digitalWrite(2 ,HIGH);// Instead of using a pull up resistor
31attachInterrupt(0,isr,RISING);   //attaching the interrupt
32
33}
34
35void loop()
36{
37delay(2000);// 2   second delay
38detachInterrupt(0);           //detaches the interrupt while calculating
39time=millis()-oldtime;         //finds the time 
40rpm=(rev/time)*60000;         //calculates rpm
41oldtime=millis();              //saves the current time
42rev=0;
43
44  display.clearDisplay();
45   display.setTextSize(2);
46  display.setTextColor(WHITE);
47  display.setCursor(0,   0);// Vertical, Horizontal.
48  display.println("RPM:");
49  display.setTextSize(5);
50   display.setTextColor(WHITE);
51  display.setCursor(0,25);
52  display.println(rpm);   
53  display.display();
54  
55
56  attachInterrupt(0,isr,RISING);
57
58
59}

// Easy Peasy Tachometer
//James Rovere 2020
#include <Wire.h>
#include   <Adafruit_SSD1306.h>// You may have to edit library for 128x64, //default is 128   x 32.

#define OLED_WIDTH 128
#define OLED_HEIGHT 64

#define OLED_ADDR    0x3C // A very common address for these displays.

Adafruit_SSD1306 display(OLED_WIDTH,   OLED_HEIGHT);


float value=0;
float rev=0;
int rpm;
int oldtime=0;         
int time;

void isr()          //interrupt service routine
{
rev++;
}

void   setup()
{
 display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
 display.clearDisplay();
    
digitalWrite(2 ,HIGH);// Instead of using a pull up resistor
attachInterrupt(0,isr,RISING);   //attaching the interrupt

}

void loop()
{
delay(2000);// 2   second delay
detachInterrupt(0);           //detaches the interrupt while calculating
time=millis()-oldtime;         //finds the time 
rpm=(rev/time)*60000;         //calculates rpm
oldtime=millis();              //saves the current time
rev=0;

  display.clearDisplay();
   display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(0,   0);// Vertical, Horizontal.
  display.println("RPM:");
  display.setTextSize(5);
   display.setTextColor(WHITE);
  display.setCursor(0,25);
  display.println(rpm);   
  display.display();
  

  attachInterrupt(0,isr,RISING);


}

Easy Peasy Tachometer

arduino

1// Easy Peasy Tachometer
2//James Rovere 2020
3#include <Wire.h>
4#include
5  <Adafruit_SSD1306.h>// You may have to edit library for 128x64,
6//  default is
7  128 x 32.
8
9#define OLED_WIDTH 128
10#define OLED_HEIGHT 64
11
12#define
13  OLED_ADDR   0x3C // A very common address for these displays.
14
15Adafruit_SSD1306
16  display(OLED_WIDTH, OLED_HEIGHT);
17
18
19float value=0;
20float rev=0;
21int
22  rpm;
23int oldtime=0;        
24int time;
25
26void isr()          //interrupt
27  service routine
28{
29rev++;
30}
31
32void setup()
33{
34 display.begin(SSD1306_SWITCHCAPVCC,
35  OLED_ADDR);
36 display.clearDisplay();
37   
38digitalWrite(2 ,HIGH);// Instead
39  of using a pull up resistor
40attachInterrupt(0,isr,RISING);  //attaching the interrupt
41
42}
43
44void
45  loop()
46{
47delay(2000);// 2 second delay
48detachInterrupt(0);           //detaches
49  the interrupt while calculating
50time=millis()-oldtime;        //finds the time
51  
52rpm=(rev/time)*60000;         //calculates rpm
53oldtime=millis();             //saves
54  the current time
55rev=0;
56
57  display.clearDisplay();
58  display.setTextSize(2);
59
60  display.setTextColor(WHITE);
61  display.setCursor(0, 0);// Vertical, Horizontal.
62
63  display.println("RPM:");
64  display.setTextSize(5);
65  display.setTextColor(WHITE);
66
67  display.setCursor(0,25);
68  display.println(rpm); 
69  display.display();
70
71  
72
73  attachInterrupt(0,isr,RISING);
74
75
76}

// Easy Peasy Tachometer
//James Rovere 2020
#include <Wire.h>
#include
  <Adafruit_SSD1306.h>// You may have to edit library for 128x64,
//  default is
  128 x 32.

#define OLED_WIDTH 128
#define OLED_HEIGHT 64

#define
  OLED_ADDR   0x3C // A very common address for these displays.

Adafruit_SSD1306
  display(OLED_WIDTH, OLED_HEIGHT);


float value=0;
float rev=0;
int
  rpm;
int oldtime=0;        
int time;

void isr()          //interrupt
  service routine
{
rev++;
}

void setup()
{
 display.begin(SSD1306_SWITCHCAPVCC,
  OLED_ADDR);
 display.clearDisplay();
   
digitalWrite(2 ,HIGH);// Instead
  of using a pull up resistor
attachInterrupt(0,isr,RISING);  //attaching the interrupt

}

void
  loop()
{
delay(2000);// 2 second delay
detachInterrupt(0);           //detaches
  the interrupt while calculating
time=millis()-oldtime;        //finds the time
  
rpm=(rev/time)*60000;         //calculates rpm
oldtime=millis();             //saves
  the current time
rev=0;

  display.clearDisplay();
  display.setTextSize(2);

  display.setTextColor(WHITE);
  display.setCursor(0, 0);// Vertical, Horizontal.

  display.println("RPM:");
  display.setTextSize(5);
  display.setTextColor(WHITE);

  display.setCursor(0,25);
  display.println(rpm); 
  display.display();

  

  attachInterrupt(0,isr,RISING);


}

Documentation

Hall Sensor wiring diagram

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