Automatic Handwashing Machine

Eng Design & Communication

Sep 2021 - Nov 2021

This independent project involved designing and prototyping an automatic handwashing assistant that encourages proper hygiene practices. The system attaches to a standard manual soap dispenser and uses a motion sensor to detect when a user dispenses soap. Upon detection, a buzzer plays a custom-designed melody for the recommended hand-lathering duration according to health guidelines, after which the user is prompted to rinse with water. The device combines functional electronics, user-focused design, and custom housing to create a simple, engaging, and effective hygiene tool.

[digital project]

Goals

  • Promote proper handwashing habits by guiding users through the recommended lathering time.
  • Integrate seamlessly with existing manual soap dispensers without altering their existing frame.
  • Design an intuitive, low-cost, and easy-to-use system for everyday environments.
  • Demonstrate skills in prototyping, electronics integration, and embedded programming.

Features

  • Arduino microcontroller as the system brain.
  • PIR motion sensor to detect soap dispensing attempts.
  • Piezoelectric buzzer programmed to play a custom melody for lathering duration.
  • 3D-printed housing designed in Fusion 360 to mount onto a manual dispenser.
  • Tinkercad used for wiring design and circuit simulation.
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[digital project][digital project]

Specific Contributions

  1. Designed and 3D-printed the custom housing for integration with existing soap dispensers.
  2. Programmed the Arduino to interface with the PIR motion sensor and play a custom melody to indicate proper lathering time.
  3. Simulated and wired circuits using Tinkercad to streamline prototyping.
  4. Delivered a fully functional prototype demonstrating both usability and compliance with health guidelines.

Handwashing Machine Demo