diy 6-button silicone rubber keypad

by:Keyuan     2020-07-19
This structure shows how to create a 6-
Key silicone rubber keyboard.
If you don\'t know anything about the silicone rubber keyboard, the Wikipedia article provides a good description.
I suggest you read it before proceeding.
This Instructable contains STL files that can be printed on a 3D printer, which can be used either for Mold creation of silicone rubber keyboards or for securing the keyboard to the top and bottom plates in the appropriate position.
It is designed to be integrated into a design that contains processors such as Arduino or Raspberry Pi, but not a stand-alone device.
Print two additional STL files using a 3D printer.
The object produced is two and a half of the keyboard mold.
I printed them with ABS plastic, but I don\'t see any reason why PLA or other common 3D printing material doesn\'t work.
Once the two parts of the mold are printed out, spray it out with the mold release.
The effect of mold release on the molded object is like the effect on the biscuit lubrication chip;
It makes it easier to remove objects.
The light coating is enough.
I suggest you spray in the well. Ventilation area.
For my keyboard, I used the silicone rubber mold
Make a composite Oomoo 30.
We don\'t make molds with it;
We use it for the keyboard itself.
It has two separate parts, usually liquid.
When you mix them together, the resulting substances harden into silicone rubber.
Completely cured after 6 hours.
You don\'t need much for this project.
I scooped some from container A with two large craft sticks and some from container B to paper cups.
I tried to get as close as possible to the equal volume of each liquid, but not measured.
Continue to stir until the color is exactly the same and then stir some more.
It won\'t harden quickly, so it will take a few seconds to make sure the compound is fully mixed before proceeding.
The top of the mold can only be installed at the bottom of the mold in one way.
Before you fall, figure out how it goes.
Pour silicone rubber into the bottom mold and add the top mold.
Silicone rubber compounds are similar to honey in consistency.
When you open the top of the mold, it will push some of the rubber in the bottom mold out of the hole, and it will most likely flow out and become a little confusing.
I apologize for losing focus on the photos.
A long edge of the assembled mold has an open slot between the top and bottom of the mold.
Turn the mold so that it can be up.
Fix the mold together using a clip or accessory, but do not require a lot of pressure.
Scoop more silicone rubber compounds into the slot at the top so the mold is completely full and let the mold solidify.
It will be very difficult in a few hours, but I have my medicine cured within the full 6 hours recommended by the manufacturer.
After the keyboard is fully cured, loosen the mold from the clip, pry the top of the mold, and carefully pull the keyboard out of the bottom of the mold.
Print two additional STL files on the 3D printer to create a board at the top and bottom.
I suggest that you print the top plate without a raft so that you can provide a better finish.
Place the keyboard on the bottom plate, and the pillars enter the holes on the keyboard.
It only goes one way, so figure out which way this is before you put it on.
Then add the plate above.
In order for the button to pass through comfortably, I had to zoom in a little to the holes on the top plate.
In order for the keyboard to work properly, when you press the button, only the part of the support button should be bent.
The frame prevents the part on the keyboard from bending when you press the button that should not be twisted;
It holds them firmly in place.
Each button at the bottom of it has a rectangular platform, circled in red in the picture.
To make the keyboard work, add a layer of conductive rubber 1-
These platforms are 2mm thick.
This manual shows how to make conductive rubber.
Conductive rubber should be flat so that it can be well attached to the board.
Under the bottom plate of the keyboard, you need a circuit board with contacts where conductive rubber can be short-circuited together.
Usually, the layout that people use is similar to the layout shown in the circuit board picture, where the contacts look like staggered fingers.
When the conductive rubber is pressed on the contact, the two contacts are connected together, so the processor (
Arduino or Raspberry Pi, for example)
It can be detected that the button has been pressed.
This construct describes how to connect a button to an Arduino.
The first experiment I did with a silicone keyboard was to create a big button.
Additional STL file for Mold creation button.
There\'s a lot of things I\'m in 6-
The button keyboard, but the big button is physically easy to work.
The picture includes the size of a quarter.
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