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Unnecessarily complicated hand sanitizer dispenser

Touchless alcohol dispenser

miroslav-hancarMiroslav Hancar
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  • miroslav-hancarMiroslav Hancar

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This project was created on 09/14/2020 and last updated 6 years ago.

Description

The goal of this project was to make use of some old components and to improve my poor Autodesk Inventor skills. I designed a simple 3D printable tank filled with a mixture of alcohol and water.
Dispenser is powered by one Li-Ion cell or from charger.
Proximity of hand is detected by a cheap ultrasonic sensor HC-SR04. PIC16F1786 measures the length of echo pulse from HC-SR04 and activates the pump if the hand is aprox. 4 cm from the sensor. The display shows the number of uses and the voltage of battery.

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