Touchless Hand Sanitizer Dispenser

Problem statement

Manual sanitizer bottles require physical touch which can spread germs, especially during outbreaks or in hospitals.

Abstract

This project builds a touchless sanitizer dispenser using a proximity sensor and a small pump. When a hand is placed near the sensor, the microcontroller activates the pump for a fixed duration, dispensing a measured amount of sanitizer. It is suitable for placement at lab entrances and classrooms.

Components required

• IR proximity or ultrasonic sensor
• Microcontroller (Arduino Nano or similar)
• Mini submersible pump or solenoid pump
• MOSFET / relay driver
• Sanitizer container with tubing
• Power supply
• Mounting frame

Block diagram

Working

The sensor monitors distance below the nozzle. When an object (hand) is detected within a threshold range, the microcontroller turns ON the pump driver for a calibrated time, dispensing sanitizer. A short delay prevents re-triggering immediately after dispensing.

Applications

• Hospitals and clinics
• College labs and entrances
• Public restrooms and cafeterias
• Basic automation and hygiene project