Hello, dear readers and homemade products!
Surely, many of you use liquid soap, and recently it has become popular to disinfect your hands with various disinfecting liquids. Of course, an ordinary mechanical dispenser performs its functions, but contact with it (especially in an office environment) is not very pleasant.
In this article, the author of the YouTube channel “KJDOT” will tell you how to make a simple contactless dispenser (dispenser) for liquid soap or disinfecting liquid.
This project is not very difficult to manufacture, and is suitable for repetition at home.
– Infrared and capacitive switches (modules) 5-24V, 3A
– Infrared proximity sensor
– Miniature submersible water pump 3-6V 100l/h
– Mini diaphragm pump
– Li-Ion battery charge controller, 5V output
– Lithium-ion battery 18350, 900 mAh, 3.7 V
– Plastic filament for 3D printing
– Flexible tube for coolant
– Flux , solder, wires
– Glass jar
– Fast-curing two-component epoxy adhesive, sandpaper.
Tools used by the author.
– Screwdriver, hot glue gun
– Electric soldering iron with temperature control
– 3D printer
– Nippers, handicraft scalpel
– Digital caliper.
The electronic filling of this device takes up very little space, and it can be installed even in a small case.
A glass or plastic jar with a screw cap is used as a container for liquid. In order for the device to have an aesthetic appearance, the author has designed a simple case.
The body is printed on a 3D printer, and a can lid will be inserted into its lower part. It will also serve as the bottom of the case.
Instead of a gander, the master uses this flexible tube .
The tube adapter is glued into the hole in the upper part of the body.
A thin silicone tube is passed inside the gander, through which liquid will flow.
The electronic circuit of the device is very simple. In it, the author has combined two purchased modules, namely:
Li-Ion battery charge controller with 5V output
and a conventional infrared proximity sensor by amplifying its output with an AO3401 transistor. Such a proximity sensor can be replaced with a more advanced module with a powerful output .
The author also designed a printed circuit board, the layout of which can be downloaded from the following link .
All components from two modules are placed on the board and soldered.
After soldering, the board is cleaned of flux.
< a href = "https://usamodelkina.ru/uploads/posts/2021-05/1620346364_ds-196.jpg" rel = "prettyPhoto"> The tube is passed through the hole in the center of the board, and the circuit is fixed in the body with hot glue.
Since the case is small, the batteries have to be used in size 18350 To increase the capacity, the author solders two such batteries in parallel.
It is even easier to use flat lithium polymer batteries .
< a href = "https://usamodelkina.ru/uploads/posts/2021-05/1620346332_ds-222.jpg" rel = "prettyPhoto"> To break the positive wire from the batteries, a small latching button is soldered.
The contacts are isolated and the batteries are fixed in the case with double-sided tape. The power and pump connector is connected to the board.
In this case, the author uses this miniature submersible pump . The use of such a pump in this device is not the best solution, because after turning it on, there is some delay in the fluid supply. Also, after shutdown, the liquid will still flow out for some time.
Here it is more correct to use a membrane mini-pump .
The power button is fixed in the case with a second glue.
Now you need turn on the device, and adjust the response distance of the infrared sensor by turning the potentiometer with a screwdriver.
A hole is drilled in the center of the cover, and a motor power wire and a silicone tube are passed through it.
The tube is connected to the pump outlet.
The board contains indicators of the charging module. Since the body is opaque, the author drills a thin hole near the LEDs and passes a piece of fishing line through it. It will serve as a light guide.
The tip of the fishing line is glued to the LEDs with a second glue.
Outside the housing, the excess fiber is cut off with nippers .
For testing, the author connected a charger, and the indication is clearly visible from the outside.
< img class = "aligncenter" alt = "How to make a non-contact dispenser for liquids (antiseptics, soaps)" src = "https://usamodelkina.ru/uploads/posts/2021-05/1620346304_ds-286.jpg"/> The cover is glued into the body with a two-component epoxy adhesive. Also, using a hot glue gun, the hole in the lid is sealed.
Everything is ready, you can fill the container, immerse the pump in liquid, and tighten the cap with electronics. If the device will not be used for a long time, you can turn it off with the button.
< img class = "aligncenter" alt = "How to make a non-contact dispenser for liquids (antiseptics, soaps)" src = "https://usamodelkina.ru/uploads/posts/2021-05/1620346310_ds-315.jpg"/> Now it is enough to raise your hand and the automatic liquid supply will start.
You can charge the batteries with a regular smartphone charger.
Here is the author's contactless dispenser.
I thank the author for the simple design of the liquid dispenser.
Good mood, everyone , good health, and interesting ideas!
The author's video can be viewed here.
Hello, dear readers and homemade products!