LED Snake — Arduino Uno R4 WiFi

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A classic Snake game for Arduino Uno R4 WiFi using the onboard LED matrix. Control is via an HW-504 analog joystick; the score is shown on a 3461BS-1 4-digit 7-segment display.

Hardware

Component	Description
Board	Arduino Uno R4 WiFi (with built-in 12×8 LED matrix)
Joystick	HW-504 (analog X/Y + push button)
Score display	3461BS-1 (4-digit common-anode 7-segment)

Wiring

Important: LED display pins

Use analog pins A2–A5 for the 3461BS-1 digit (common) pins, not A1–A4 as in some standalone display diagrams. Pins A0 and A1 are used by the HW-504 joystick (VRx, VRy).

Resistors

• Use 220 Ω resistors in series with each of the eight segment lines (a–g and dp) of the 3461BS-1 to limit LED current.

Combined wiring diagram

                    ARDUINO UNO R4 WIFI
                    ┌─────────────────────────────────────────┐
                    │  POWER          DIGITAL         ANALOG  │
                    │  5V ────┬───   2 ◄─── SW        A0 ◄── VRx (joystick)
                    │  GND ───┼───   5 ───► seg a      A1 ◄── VRy (joystick)
                    │         │      6 ───► seg b      A2 ───► digit 1 (3461BS-1)
                    │  (shared│      7 ───► seg c      A3 ───► digit 2
                    │   GND/  │      8 ───► seg d      A4 ───► digit 3
                    │   5V)   │      9 ───► seg e      A5 ───► digit 4
                    │         │     10 ───► seg f                   │
                    │         │     11 ───► seg g                   │
                    │         │     12 ───► seg dp                  │
                    └─────────┼─────────────────────────────────────┘
                              │
         ┌────────────────────┼────────────────────┐
         │                    │                    │
         ▼                    ▼                    ▼
    ┌─────────┐          ┌─────────┐          ┌──────────────────┐
    │  HW-504 │          │  GND/   │          │ 3461BS-1         │
    │ Joystick│          │  5V     │          │ 4-digit 7-seg    │
    │         │          │ (bread- │          │                  │
    │ VRx ────┼──────────┼─► A0    │          │ Each segment     │
    │ VRy ────┼──────────┼─► A1    │          │ (a,b,c,d,e,f,g,  │
    │ SW  ────┼──────────┼─► D2    │          │  dp) ← 220Ω ←   │
    │ +5V ────┼──────────┼─► 5V    │          │ D5,D6..D12       │
    │ GND ────┼──────────┼─► GND   │          │                  │
    └─────────┘          └─────────┘          │ Digit 1..4 ──────┼─► A2,A3,A4,A5
                                              └──────────────────┘

Summary table

HW-504 pin	Arduino pin	3461BS-1	Arduino pin
GND	GND	—	—
+5V	5V	—	—
VRx	A0	—	—
VRy	A1	—	—
SW	D2	—	—
—	—	Segment a	D5 (via 220Ω)
—	—	Segment b	D6 (via 220Ω)
—	—	Segment c	D7 (via 220Ω)
—	—	Segment d	D8 (via 220Ω)
—	—	Segment e	D9 (via 220Ω)
—	—	Segment f	D10 (via 220Ω)
—	—	Segment g	D11 (via 220Ω)
—	—	Segment dp	D12 (via 220Ω)
—	—	Digit 1 common	A2
—	—	Digit 2 common	A3
—	—	Digit 3 common	A4
—	—	Digit 4 common	A5

Individual wiring references (note: use A2–A5 for the display, not A0–A3):

• HW-504 connection
• 3461BS-1 connection — in this project, connect digit commons to A2, A3, A4, A5 instead of A0–A3.

Software

• Sketch: sketches/snake.c (use with Arduino IDE or similar; ensure the file is part of a .ino project or adapted to your build system).
• Library: Arduino_LED_Matrix (included with the Uno R4 WiFi board package).

Gameplay

• Move: Joystick (up/down/left/right).
• Pause: Joystick button (SW).
• Score: Shown on the 3461BS-1 (0–9999). Game speed increases as the score goes up.

License

Use and modify as you like; no warranty.