3d Printed Slot Machine

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Hardware components

×1
DC-DC Buck Step Down Module 3.3V 5V 9V 12V 3A Adjustable Voltage Regulator Power
×1
17mm Diam Piezo Piezoelectric Passive Buzzers
×1
60mmx60mm Red/Green 8×8 LED matrix
×3
DM13A LED Driver
×3
74HC138 3 to 8 Line Decoder/Driver
×1
AO3401 P-Channel MOSFET SOT-23
×8
Resistors 0805 SMD
8 x 100 OHM
8 x 1K OHM
3 x 2K7 OHM
×1
5.5 x 2.1mm DC Power Supply Jack Socket Female Panel Mount Connector
×1
Adafruit Tactile Switch Buttons (6mm slim) x 20 pack
×1

Software apps and online services

Hand tools and fabrication machines

3D Printer (generic)
Soldering iron (generic)

While looking at projects on the Adafruit site, I came across a fruit machine project that has a cool 3D printed lever that incorporates its own return spring. The Adafruit fruit machine is built around a fairly large 32×64 RGB Matrix (4mm pitch) display. Since I had three 60mm x 60mm Red/Green LED matrixes that were left over from another project, I thought that I would modify my Matrix Slot Machine to incorporate this 3D printed lever.

Video

Design

The Red/Green matrix modules are common anode. Each matrix has 16 cathodes (8 red and 8 green). The cathodes are connected to a DM13A 16 Channel shift register with each output being a constant current LED driver. The anodes for each matrix are connected to a single set of 8 P-Channel MOSFETs which are driven by a 3 to 8 line decoder/driver so as to reduce the pin count needed for the microprocessor.

3 x LED drivers for the cathodes, 8 MOSFETs for the anodes

Building the display panel

I designed a PCB to hold the LED drivers and their associated components.

I have included the Eagle files in case you want to get the board commercially made or do as I did and make it yourself. I used the Toner method.

Start by adding the resistors, capacitors and MOSFETs.

Next add the links if you are using a single sided PCB

3d Printed Slot Machine Machines

Add the resistors, capacitors and MOSFETs, then add the links

Solder on a 10pin header for the connections to the microprocessor board.

The 3 x DM13A and 1 x 74HC138 ICs are DIL variants. Their IC sockets have their pins flattened out and soldered to the board like a SMD device.

Finally add the red/green common anode matrix modules

Flatten out the pins of the IC sockets and solder onto board

3D printing the case and lever

Use the following settings in your slicer software:

Slot MachineV2 – Front.stl – 0.2 layer height, 20% infill, supports touching build plate, brim. After printing, drill the holes that hold the handle with a 2.5mm drill and create a thread with a 3mm tap.

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Slot MachineV2 – Back.stl– 0.2 layer height, 20% infill, no supports, brim

Slot MachineV2 – Diffuser.stl 0.1 layer height, 20% infill, no supports, brim, print first 3 layers in white, change to black on the start of layer 4.

ball-handle.stl – 0.2 layer height, 20% infill, no supports, brim

matrix-handle.stl – 0.2 layer height, 20% infill, no supports, brim (2 required)

Assembling the lever

3d Printed Slot Machine Patterns

The lever assembly is screwed on to the side of the front using M3 screws. Use countersunk head (flat head) screws. Place the switch on the holder and run the wires to the inside of the case.

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Mount lever and switch. Run switch wires to the inside of the case.
Printed

Adding the diffuser and display module

The display module should be a tight fit. If it is too tight, file it down a bit and if it is too loose, add some blue painters tape as padding on the inside of the case.

Wiring up the microprocessor and other components

I added a two pin right angle header to D2 and GND so that the button cable can be removed to separate the back panel.

The display board is connected to the microprocessor with nine wires:

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The speaker is connected to D8 (-ve side) and D9 (+ve side).

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Arduino Pro Mini, 3A regulator, Buzzer and DC power socket fixed to back panel

Make sure you set the 3A regulator to output 5V BEFORE you wire it to the 5V rail of the Arduino Pro Mini.

Programming

You will need a FTDI module to program the Arduino Pro Mini (6 pin header). The FTDI module will connect to your USB port on your computer. Load up the Arduino IDE and set the board to a Arduino Pro Mini 5V 16Mhz and upload the sketch.

3d Printed Slot Machine

Final assembly

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Custom parts and enclosures

STL Files

3d Free Slots No Downloads

Schematics

Best 3d Printing Machines

Eagle Files