Created November 26, 2019 © GPL3+

Digital Tachometer with Arduino for measuring RPM

The tachometer is a device utilized for measuring the number of revolutions of an object in a specific interval of time.

Intermediate17

Digital Tachometer with Arduino for measuring RPM

Things used in this project

Hardware components

Arduino UNO

Adafruit RGB Backlight LCD - 16x2

Tactile Switch, Top Actuated

IR sensor module

Software apps and online services

Arduino IDE

Story

Tachometer:

The tachometer is used to measure an RPM counter which counts the number of rotations per minute. The tachometer is divided into two types one mechanical and another one is digital. Here in this project, we are going to design an IR sensor module to recognize objects for count rotation of any rotating body.

IR Sensor Module:

An IR sensor is an electronic instrument that is utilized to genuine certain features of its surroundings by either emitting and/or detecting infrared radiation. Infrared sensors are also able to measure the heat being released by an object and detecting motion.

IR transmits IR rays that return back to the IR receiver and then IR Module creates an output or pulse which is recognized by the Arduino controller when we press the start button. It counts constantly for 5 seconds.

Depends on the intensity of the reception by the IR receiver, the output of the sensor is determined.

Working Mechanism:

In this circuit, the IR sensor module is interfaced with Arduino to estimate fan rotation speed in RPM. The calculation is done as follows.

After 5 seconds Arduino measures RPM for a minute using the given formula.

RPM= Count x 12 for single object rotating body.

But here we describe this project using a fan which was rated 9V/100mA. So the formula will be:

RPM=count x 12 / objects

Where object = number of the blade in a fan.

hIoTron offers an End-to-End Classroom IoT Training which will give you a holistic view of IoT devices and applications that you want to know.

Run a Code

#include <LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
#define sensor 9
#define start 12
int delay1()
{
//unsigned int long k;
int i,j;
unsigned int count=0;
for(i=0;i<1000;i++)
{
for(j=0;j<1000;j++)
{
if(digitalRead(sensor))
{
count++;
while(digitalRead(sensor));
}
}
}
return count;
}
void setup()
{
pinMode(sensor, INPUT);
pinMode(start, INPUT);
pinMode(2, OUTPUT);
lcd.begin(16, 2);
lcd.print(" Tachometer");
delay(2000);
digitalWrite(start, HIGH);
}
void loop()
{
unsigned int time=0,RPM=0;
lcd.clear();
lcd.print(" Please Press ");
lcd.setCursor(0,1);
lcd.print("Button to Start ");
while(digitalRead(start));
lcd.clear();
lcd.print("Reading RPM.....");
time=delay1();
lcd.clear();
lcd.print("Please Wait.....");
RPM=(time*12)/3;
delay(2000);
lcd.clear();
lcd.print("RPM=");
lcd.print(RPM);
delay(5000);
}

Credits

hIOTron

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Digital Tachometer with Arduino for measuring RPM

Digital Tachometer with Arduino for measuring RPM

Things used in this project

Hardware components

Software apps and online services

Story

Code

Run a Code

Credits

hIOTron

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