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diy-ohmmeter-using-arduino-c33f9e-en.md

Measure the resistance of an unknown resistor using Arduino.

In this project, I measured the resistance of an unknown resistor(1k)

I got a reading of 1007.84 ohms. Percentage error = 0.784%

Determination of LDR resistance using this set up

EXPANDED TECHNICAL DETAILS

Resistive Impedance Measurement Hub

This project provides a functional digital ohmmeter, demonstrating the fundamental principles of voltage division and electrical sensing.

  • Reference-Voltage Division Matrix: The Arduino uses a known high-precision resistor in series with the "Unknown" resistor. By measuring the analog voltage at the junction, the firmware solves for the unknown resistance using Ohm's Law.
  • Auto-Range Scaling Logic: (Advanced version) Includes multiple reference resistors. The Arduino automatically switches between them via digital pins to ensure maximum accuracy across a range from 10 ohms to 1 megohm.

Accuracy

  • ADC Oversampling Kernel: Captures 10 analog samples for every reading and calculates the median value, effectively filtering out electrical noise and providing a rock-solid resistance measurement on the LCD.

ข้อมูล Frontmatter ดั้งเดิม 

title: "DIY Ohmmeter using Arduino"
description: "Measurement of unknown resistance using Arduino."
author: "manodeep"
category: ""
tags:
  - "environmental sensing"
  - "debugging tools"
  - "monitoring"
views: 988
likes: 0
price: 870
difficulty: "Easy"
components:
  - "1x Jumper wires (generic)"
  - "1x Arduino Nano R3"
  - "2x Resistor 1k ohm"
tools: []
apps:
  - "1x Arduino IDE"
downloadableFiles:
  - "https://projects.arduinocontent.cc/518dcc67-824e-431f-ac40-0e7a094eb6fb.ino"
documentationLinks: []
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seoDescription: "Build a DIY Ohmmeter using Arduino to measure unknown resistance. Step-by-step guide with circuit diagrams and code."
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