Tachometer

This Tachometer very precise. it measures too fast or slow RPMs and it can be used to measure engine RPM or any thing.

BeginnerFull instructions provided895

Things used in this project

Hardware components

IR Transceiver (Generic)

RGB LCD Shield Kit, 16x2 Character Display

Microchip ATmega328

16 MHz Crystal

Capacitor 22 pF

Arduino UNO

Hand tools and fabrication machines

Soldering iron (generic)

Solder Wire, Lead Free

PCB, For DMB-4775

Hot glue gun (generic)

Story

I am currently making an electric Bike, but the problem is that I wanted to measure the RPM of the electric motor.

I searched for DIY tachometers online but they didn't work :(, so I decided to make my own.

Its principal is very easy ; it uses IR Sensor to detect every rotation and then the microcontroller counts the time it took to complete 20 revs and then divides the number of revs over the time it measured and finally multiply it by 60 to give us RPM aka revolutions per minute.

Code

Tachometer_Code

// Tachometer with lcd i2c screen
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#define sensor_pin 2
int READ = 0;
int i = 0;
bool mask = 0;
unsigned long timer = 0;
float Time = 0.0;
int RPM = 0;
const int revnum = 20;
void setup()
{
  pinMode(sensor_pin, INPUT);
  //  Wire.begin();
  Serial.begin(115200);
  lcd.begin();
  lcd.backlight();
  timer = millis();
}

void loop()
{
  READ = digitalRead(sensor_pin);
  if (READ == 0 && mask == 0) {
    i++;
    mask = 1;
  }
  if (READ == 1 && mask == 1) mask = 0;
  if (i == revnum) {
    Time = millis() - timer;
    Time = Time / 1000;
    RPM = ( revnum / Time ) * 60;
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(revnum);
    lcd.setCursor(3, 0);
    lcd.print( "revs / ");
    lcd.setCursor(10, 0);
    lcd.print(Time);
    lcd.setCursor(15, 0);
    lcd.print("s");
    lcd.setCursor(0, 1);
    lcd.print("RPM = ");
    lcd.setCursor(6, 1);
    lcd.print(RPM);
    lcd.setCursor(12, 1);
    lcd.print("rpm");
  }
  if (i >= revnum) {
    i = 0;
    timer = millis();
  }
  Serial.print(i);
  Serial.print("  ");
  Serial.print(mask);
  Serial.print("  ");
  Serial.print(Time);
  Serial.print("S");
  Serial.print("  ");
  Serial.print(RPM);
  Serial.println("RPM");

}

Credits

georgehany

1 project • 0 followers

Yohanna Hoepers

0 projects • 0 followers

Tachometer