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magnetic-stirrer-776549-en.md

I bought my first magnetic stirrer to help improve my mushroom liquid cultures. After seeing how much the constant stirring improved the culture, I decided I wanted more of them. After reading a few articles about the magnetic stirrers, I found that I could use an Arduino as the control signal (PWM) to drive PC fans and make a batch of magnetic stirrers for about the same price as one entry level stirrer.

EXPANDED TECHNICAL DETAILS

Laboratory Motion Automation

The Magnetic Stirrer is a professional-grade lab tool that uses a rotating magnetic field to stir liquids inside a sealed container without physical contact.

  • Brushless DC Speed Control: The Arduino manages the RPM (Revolutions Per Minute) of a standard PC fan equipped with high-strength Neodymium magnets. It uses Pulse Width Modulation (PWM) via a MOSFET to ensure a smooth, vortex-forming rotation.
  • Persistent Speed Dashboard: Displays the current "Stir Strength" or estimated RPM on a sharp I2C LCD or OLED screen, giving the user precise control over chemical or culinary mixing processes.

Cooling and Safety

  • Thermal Management: The firmware includes a safety timer and monitors the motor's current consumption, preventing the stirrer from overheating during long-duration (24h+) mixing sessions.

ข้อมูล Frontmatter ดั้งเดิม 

title: "Magnetic Stirrer"
description: "Develop a strong magnetic stirrer for the price of an entry level magnetic stirrer."
author: "jdale18"
category: "Lab Stuff"
tags:
  - "home automation"
  - "smart appliances"
  - "garden"
views: 14811
likes: 6
price: 1120
difficulty: "Easy"
components:
  - "1x Multimeter"
  - "1x Rotary potentiometer (generic)"
  - "1x General Purpose Transistor NPN"
  - "1x Arduino Mega 2560"
  - "1x 12 Vdc  PC fan size: 80mm"
  - "2x Neodymium Rare-Earth Magnets (size: about the size of dime and about 0.25 in thick"
  - "1x 120 AC to 12 Vdc 2amp wall converter"
tools: []
apps:
  - "1x Arduino Web Editor"
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documentationLinks: []
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seoDescription: "Build a powerful Magnetic Stirrer at an entry level price. Ideal for budget DIY lab equipment projects."
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lang: "en"