Fidget Spinner RPM Counter Using Arduino

Hi everyone! This is my next project, Fidget Spinner RPM Counter or Arduino Tachometer with Hall-Effect Sensor.

1: Requirements

Parts Required:

• Fidget Spinner

• neodyimium magnet

• Arduino Uno

• LED + resistor 220 Ohm

• Hall-Effect Sensor – a3144

• resistor 10 k

• Wires

• Breadboard

• LCD 1602

2: Hall-Effect Sensor

Using Hall-Effect Sensor we can measure the speed of rotation. I used Hall-Effect Sensor – a3144.

RPM (Revolutions per minute) – the number of revolutions per minute. Revolutions per minute – a unit of measurement of rotational speed: the number of complete rotations made by the body (fidget spinner, wheel etc.) around a fixed axis. Used to describe the speed of rotation of the mechanical components in the mechanisms and machines.

3: How does it work?

To measure the speed of rotation on the Fidget Spinner must be mounted a part of neodyimium magnet that affect the Hall sensor after each complete turn of the Spinner.

4: Indication

The presence of a magnetic field is indicated on the LED.

LCD 1602 indicates current RPM, maximum RPM and tachometr bar (from 0 up to 1260rpm). 1260 rpm is my personal record.

#include <LiquidCrystal.h>
LiquidCrystal lcd(13,12,11,10,9,8);
const int hallSensorPin = 2;                      // connect the hall effect sensor on pin 2
const unsigned long sampleTime = 1000;
const int maxRPM = 1260;                  // maximum RPM for LCD Bar
int rpmMaximum = 0;

void setup() 
{
  pinMode(hallSensorPin,INPUT);
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.print("Initializing");
  delay(1000);
  lcd.clear();
}