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digital-tachometer-using-ir-sensor-1ce0ec-en.md

I was working with some motors and I needed to measure the RPM of it so I went online and searched for a digital tachometer but all of them were too expensive.So, I decided to make one myself using IR sensor and Arduino.

EXPANDED TECHNICAL DETAILS

High-Speed Rotational Analysis

This tachometer provides professional-grade RPM (Revolutions Per Minute) measurement for fans, motors, or engines using non-contact optical reflection.

  • Infrared Pulse Timing: Uses an IR transmitter and phototransistor pair. A reflective strip on the rotating shaft breaks the IR beam once per revolution. The Arduino captures these "Gate Pulses" using a Hardware Interrupt pin.
  • RPM Calculation Engine: The firmware calculates the time between two interrupts ($\Delta t$) and performs the conversion: $RPM = 60,000 / \Delta T_{(ms)}$. The result is filtered using a Moving Average to provide a stable readout on a 16x2 I2C LCD.

Accuracy

  • High-Resolution Timer: Leverages the 16MHz clock of the Arduino Nano or Uno to achieve $\pm 1$ RPM accuracy even at high speeds (up to 30,000 RPM).

ข้อมูล Frontmatter ดั้งเดิม 

title: "Digital Tachometer using IR Sensor"
description: "DIY digital tachometer using IR Sensor and Arduino(No display, output shows on serial monitor)."
author: "manodeep"
category: ""
tags:
  - "environmental sensing"
  - "data collection"
views: 7613
likes: 2
price: 1120
difficulty: "Easy"
components:
  - "1x Arduino Nano R3"
  - "1x Breadboard (generic)"
  - "1x Jumper wires (generic)"
  - "1x IR Proximity Sensor"
tools: []
apps:
  - "1x Arduino IDE"
downloadableFiles:
  - "https://projects.arduinocontent.cc/6f10d35c-0b38-49ed-9c7e-4d93266a4362.ino"
  - "https://projects.arduinocontent.cc/6f10d35c-0b38-49ed-9c7e-4d93266a4362.ino"
documentationLinks: []
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seoDescription: "Build a DIY Digital Tachometer using IR Sensor and Arduino. View RPM results on Serial Monitor without a display."
videoLinks: []
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lang: "en"