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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesYou can make a homemade slot-machine game with an Arduino, an OLED display, a button and a buzzer—without using real money or prizes. Build and test the electronics on a breadboard first, program the reels to spin and stop, then fit the finished project into a cabinet.
Parts and tools for an Arduino slot-machine game
A documented beginner build uses an Arduino UNO R4 WiFi and a small set of low-voltage components. The display draws the reels, the button starts a spin, and the buzzer supplies sound feedback.
- One Arduino UNO R4 WiFi
- One USB-C cable
- One solderless breadboard and several jumper wires
- One push button
- One I2C OLED display module, preferably 128×64
- One active buzzer
These are the quantities specified by SunFounder’s Arduino slot-machine tutorial; check the module’s pin labels and specifications before wiring, since display and buzzer modules can differ.
Build and test the electronics
1. Wire the breadboard prototype
Place the UNO R4 WiFi, OLED, button and buzzer on a breadboard. Connect the OLED using I2C, the button to a digital input and the buzzer to a digital output. Follow the board and module pin labels for power, ground and signal connections. Disconnect USB power before changing wiring, then inspect the connections before reconnecting it.
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2. Install the Arduino software libraries
- Open Arduino IDE and install the Adafruit SSD1306 and Adafruit GFX libraries through its library manager.
- Select the UNO R4 WiFi as the board and choose the serial port for the connected board.
- Upload the tutorial sketch and check that the OLED initializes and the button and buzzer respond.
The library names and setup sequence are given in the SunFounder tutorial. If the display stays blank, check its I2C wiring and module compatibility before changing the game code.
Program the reels and game feedback
Treat the OLED as three small reel windows. Define a limited set of symbols—such as a cherry, star, lemon, heart and seven—and update the displayed symbols while a spin is in progress. When the player presses the button, start the animation, stop the reels in sequence, then show the result and sound the buzzer or light an indicator.
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Give each reel its own update interval so the symbols do not all appear to move and stop as one block. A simple program can use separate spin and stop routines and then check whether the stopped symbols match. SunFounder’s 2.0 example demonstrates state-based reel control, three-button interaction and green, red and yellow indicator LEDs.
For a non-wagering game, award points or display a message rather than paying out money or prizes. If the program selects symbols randomly, document the selection method and keep any configured odds visible in the code. A hobby project is not casino-certified random-number hardware.
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Choose a display and controls
| Choice | What it offers | Trade-off |
|---|---|---|
| OLED display | Compact display used in the basic tutorial for showing reel symbols. | Requires compatible wiring and library setup. |
| I2C LCD | An alternative shown in SunFounder’s 3.0 variant. | Use the display-specific wiring and code for that version. |
| One button | Starts a spin with minimal controls. | Offers less interaction than a multi-button design. |
| Three buttons and indicator LEDs | Adds richer input and separate win or loss feedback, as in the 2.0 example. | Needs additional inputs, outputs and wiring. |
Make a cabinet after the prototype works
Measure the tested electronics before designing an enclosure. Leave access to the USB port, provide ventilation, and make panels removable so you can repair wiring or update the code. Secure the display and button, insulate exposed conductors and add strain relief to the USB cable before closing the cabinet.
3D printing is a documented hobby approach: an Arduino Blog project used 3D-printed enclosure and mechanical parts, while the milestorm project describes a printed box with separate coin and electronics spaces. A printed cabinet can be iterated around custom shapes; wood or MDF can suit a larger cabinet, but plan the dimensions and service access before cutting.
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Keep the project non-wagering
The cited maker tutorials describe hobby builds, not gambling compliance. Keep the game score-based unless you have checked the laws and requirements that apply where it will be used. Accepting money, offering prizes or installing a coin mechanism can raise jurisdiction-specific legal and compliance issues that these project sources do not resolve.
Keep the electronics enclosed, disconnect power whenever you rewire, and preserve access for maintenance. Do not treat the prototype’s random selection as a certified gambling system.
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- Include High Quality Base Board base on Arduino UNO R3 compatible with Arduino IED and Sensors, Servo, Motor, ULN2003 driver board, lcds, etc.
- Free PDF Tutorial and Datasheet are available to download from our official website or you can contact our customer service.
- All of the Components and Integrated Circuits are individually packaged and labeled, and packing in a plastic box which is bigger enough for you.
Buying the components
Useful search terms include “Arduino UNO R4 WiFi starter kit,” “128×64 I2C OLED display module,” “active buzzer module,” “solderless breadboard and jumper wires” and, if printing an enclosure, “PLA filament for 3D printer.” Starter-kit contents, board revisions, prices and availability vary, so confirm that a kit includes the parts and compatible modules your build needs.
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