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Related Concept Videos

Design Example: Resistive Touchscreen01:14

Design Example: Resistive Touchscreen

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A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
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Maasi: A 3D printed spin coater with touchscreen.

Dani Carbonell Rubio1, Willi Weber1, Enrico Klotzsch1

  • 1Institute for Biology, Experimental Biophysics/Mechanobiology, Humboldt University of Berlin, Berlin, Germany.

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Summary

Introducing Maasi, a low-cost, 3D-printed spin coater built with commercial components. This affordable lab tool offers key features for thin-film deposition, making advanced techniques accessible.

Keywords:
3D printingBLHeli32CoatingESP32NextionOpen source hardwareSpin coaterTouchscreen

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Area of Science:

  • Materials Science
  • Engineering
  • Biotechnology

Background:

  • Spin coating is a common method for uniform thin-film deposition.
  • High cost of commercial spin coaters limits accessibility in research and education.
  • Need for affordable, customizable lab equipment is growing.

Purpose of the Study:

  • To present Maasi, a low-cost, easily assembled spin coater.
  • To demonstrate a design utilizing 3D-printed parts and Commercial Off-The-Shelf (COTS) components.
  • To validate the performance and accuracy of the Maasi spin coater.

Main Methods:

  • Utilized 3D printing for core components and COTS for electronics.
  • Implemented an electronic speed controller (ESC) with telemetry, eliminating the need for a rotor position sensor.
  • Designed 3D-printable substrate holders for various sample sizes (up to 80 mm).

Main Results:

  • Maasi spin coater costs under 100 Euros and assembles in 2 hours.
  • Achieved accurate speed control and reliable performance in coating polydimethylsiloxane (PDMS).
  • Demonstrated usability with a touchscreen interface.

Conclusions:

  • Maasi provides an affordable and functional alternative to expensive commercial spin coaters.
  • The design facilitates accessibility to thin-film deposition techniques for a wider range of users.
  • This project serves as a model for developing other cost-effective laboratory tools.