Automatic Hand Sanitizer


Hi, friend’s today  In this project I will show you I will try to describe the assembly of an automatic hand sanitizer dispenser. Keep your hands clean by filling it with hand sanitizer or soap. an automated hand sanitizer keeps virus from spreading around in communal areas.

Since the uses of hand sanitizers has increased with the Covid19 outbreak. so I thought it would be a great idea to make Automatic hand sanitizer

this project can be assembled by everyone, since it will be assembled from inexpensive components,

Well, well, I think you shouldn’t delay with a long preface

Parts & Materials

Parts & Materials Links:

  1. Water Pump:       (IND) / (USA)
  2. Infrared Sensor:  (IND) / (USA)
  3. Batteries Holder:  (IND) / (USA)

The design of the electronics is very simple, using a transistor as a simple switching device. It does not require any arduino and programming.

Schematic Diagram

Image credit : Tech_Builder

The schematic is also very simple and easy, The infrared proximity sensor detects the presence of a hand and makes the OUT pin LOW.

I used the BD140 power transistor for the circuit, 1K resistor is connected between sensor OUT and the base of the transistor.

Wire the Simple Circuit

We cut the opposite leg of the transistor to the opposite leg of the infrared (OUT contact), but through a 1k resistor.

And we will be powered by two 18650 batteries.

Follow the above circuit diagram and solder the wires and components together.

Drill Holes for Wire and Tube

The next step is to select a container suitable for the purpose.

We used a glass jar in the form of a cylinder, which is actually ideal for our tasks, it is compact and practical.

It is worth noting that you can use any capacity, even a one hundred liter barrel, it all depends on your needs and on how and where you will use this Automatic Hand Sanitizer

  • In the lid of the jar you have taken, you need to drill a pair of through holes.
  • A silicone pipe will pass through one of the holes
  • through the second hole, it will pass the wires to the water pump.
  • To make exactly the neat holes, you must use a drill machine.

The next step is to take the 6V water pump, to the outlet of the water pump you have taken, you must put on a silicone pipe (as show in picture)

Now you need to fit the pump. To do this, we solder the black negative power wire to the “GND” contact on the infrared sensor, but the red positive spotting wire is soldered to the central contact of the transistor.

And the actual filling of the structure is ready and at this stage it should look approximately.

We glue the infrared sensor to the lid of the jar using double sided tape, then Submerge the water pump to the bottom of your can and close the lid, it is necessary to glue the battery with container back side. we insert the 2x 18650 batteries into the battery holder, We turn on the device and check its performance.

Cut off the excess part of the pipe with scissors. cut out the facing parts the cover for the IR sensor.

Cut the Excess Tube & Makeshift Nozzle

A nozzle can be used to control the amount of fluid exiting the dispenser. I got mine from the tip of a dried out pen.

Fill the Dispenser

You can now fill your dispenser with whatever liquid you want, water filter, alcohol, etc.

Test It!

YouTube Tutorial:

All credit :- The Wrench 


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