coffee table pi

by:GSH     2020-10-14
The purpose of this project is to create a modern thin line version of an arcade cocktail cabinet.
In addition, other tasks such as browsing web pages or writing emails can be performed using a wireless keyboard and mouse.
The 24 inch LCD screen installed in the center can be used to do anything, such as displaying home photos or updates to social networking sites.
In the spirit of low cost, all wood products used are recycled.
In addition to the Raspberry pi itself, the main cost is the 24 inch LCD screen in the middle along with the arcade joystick and buttons.
For the convenience of children, the corners are round and the perspex is mounted on the LCD screen.
I used the 24 inch LCD screen with LED backlight.
Select a screen of any size.
Make sure it has a good viewing angle as the screen will be installed up and almost always viewed at one angle.
Test the screen viewed from above and below, from the left and right, and make sure it still looks almost as good as when viewed directly.
Choose one that can be installed on the wall as it can be attached to the table from below.
Select a button that can be opened without any buttons, because all buttons are hidden in the table.
Joystick and button it\'s up to you, I used the Happ 4 or 8 arcade ball top joystick, 2 blue American buttons, 1 player button and 2 player buttons.
The Perspex sheet 4mm is cut into the size of the outside edge of the LCD screen, larger than the viewing size of the screen, as it will be screwed to the lower side at the top of the table.
Wood, glue, screws, stains and finished products all depend on what you want to do.
I used pine trees recovered from all over the world.
Because I want to learn to use hot Hide glue.
It will be easier to use screws instead of glue or screws and regular wood glue.
I used a black stain and then a shellac French polish.
SoundI recycled a nice 5 inch speaker and used a circuit for an old computer speaker.
This enables us to plug in the headphones and turn off the speakers automatically.
Start with the sides and legs.
Make sure the sides are easy to grow, wide, and deep enough to hold the screen.
In addition, Raspberry pi, speakers and cables need to be installed.
I cut a groove on my leg to fit on both sides.
Make the part where the stick and button are placed and connect to the side.
Finally, make the top with 4 pieces so that the hole in the middle is the same viewing size as the LCD screen.
The sides of the table should be wide enough to have a wireless keyboard and mouse.
Arrange the underside of the top into grooves to fit the perspex.
Route the curve to the inner edge at the top.
Attach the top to the legs and sides.
Perspex is screwed into the groove below the top.
The LCD screen does not press hard on the perspex because the pressure affects the display of my specific screen.
The LCD is attached to the two wooden pillars below, so the screen is located just below perspex.
Drill holes for the joystick, two buttons at the top and one player, two player buttons on the side.
A wooden label is added to the bottom edge to connect the lid made of 4mm layers of wood made from the back of the old cabinet.
There is a large cover in the main part and a small cover in the joystick and button parts.
This photo shows the dual adapters used to power Raspberry pi and LCD screens.
A black cable runs through the cover on the side of one leg.
When I added the sound, the dual adapter was later changed to the 4-port adapter.
Use 8 GPIO inputs.
4 for joystick and 4 buttons.
An old floppy drive cable is cut to a large size.
This product can be inserted into the raspberry pie.
The other end enters a prototype board that has an pull-up resistor and a drop-down resistor for each of the 8 inputs.
Then connect the wire to the joystick and button.
The Raspberry pi also comes with a usb wifi and a usb wireless keyboard/mouse combo.
Warning: this step needs to open the housing of some old cheap computer speakers.
The supply voltage is inside and should be careful.
You can make an amplifier circuit yourself, but this is an easy way.
Find an old computer speaker
The amplifier circuit inside has everything we need.
The transformer on the left side bears the supply voltage and provides 9v AC to the circuit board.
The coffee table was surrounded safely.
Do not touch the transformer when the power is on.
The volume pan is removed from the board and hardwired with 2 resistors, equivalent to being in the maximum volume position.
Volume will be adjusted from pi.
The mini stereo socket is installed in the bottom cover.
When the earphone is plugged in, the circuit bypass the speaker.
The boot menu allows you to select the game using advanced mame or web browsing in the boot to window manager.
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