minors

when someone scores a point, speed is resetted to the initial speed

.github/workflows/cd.yml

@@ -0,0 +1,37 @@
+name: Arduino Pong CD
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Arduino CLI
+        run: |
+          curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
+          echo "./bin" >> $GITHUB_PATH
+
+      - name: Install Board Core and Libs
+        run: |
+          arduino-cli core update-index
+          arduino-cli core install arduino:renesas_uno
+
+      - name: Build Binary
+        run: make compile
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            build/*.bin
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/ci.yml

@@ -0,0 +1,39 @@
+name: Arduino Pong CI
+
+on:
+  push:
+    branches: [ master ]
+    paths:
+      - 'arduino_pong.ino'
+      - 'Makefile'
+      - '.github/workflows/ci.yml'
+      - '*.cpp'
+      - '*.h'
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v6
+
+      - name: Setup Arduino CLI
+        #uses: arduino/setup-arduino-cli@v2
+        shell: bash
+        run: |
+          curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
+          echo "./bin" >> $GITHUB_PATH
+
+      - name: Install UNO R4 Core
+        run: |
+          arduino-cli core update-index
+          arduino-cli core install arduino:renesas_uno
+          
+      - name: Compile Sketch (via Makefile)
+        shell: bash
+        run: make prepare_and_compile

.gitignore

@@ -0,0 +1,4 @@
+.secrets
+.arduino_cache/
+bin/
+build/

Makefile

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+PORT ?= /dev/ttyACM0
+BOARD = arduino:renesas_uno:unor4wifi
+SKETCH = arduino_pong.ino
+CACHE_DIR = $(shell pwd)/.arduino_cache
+BIN_DIR = $(shell pwd)/bin
+CLI = $(BIN_DIR)/arduino-cli --config-file $(CACHE_DIR)/arduino-cli.yaml
+
+YELLOW := \033[0;33m
+GREEN  := \033[0;32m
+CLEAR  := \033[0m
+
+prepare:
+	@mkdir -p $(BIN_DIR)
+	@mkdir -p $(CACHE_DIR)
+	@if [ ! -f $(BIN_DIR)/arduino-cli ]; then \
+		echo -e "📥 $(YELLOW)Downloading arduino-cli...$(CLEAR)"; \
+		curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | BINDIR=$(BIN_DIR) sh; \
+	fi
+	@if [ ! -f $(CACHE_DIR)/arduino-cli.yaml ]; then \
+		echo -e "⚙️ $(YELLOW)Initializing local config...$(CLEAR)"; \
+		$(CLI) config init --dest-dir $(CACHE_DIR); \
+		$(CLI) config set directories.data $(CACHE_DIR)/data; \
+		$(CLI) config set directories.downloads $(CACHE_DIR)/downloads; \
+		$(CLI) config set directories.user $(CACHE_DIR)/user; \
+	fi
+	@if ! $(CLI) core list | grep -q "arduino:renesas_uno"; then \
+		echo -e "$(YELLOW)📥 Installing board core...$(CLEAR)"; \
+		$(CLI) core update-index; \
+		$(CLI) core install arduino:renesas_uno; \
+	fi
+
+compile:
+	@mkdir -p build
+	@echo -e "$(GREEN)🛠️  Compiling $(SKETCH)...$(CLEAR)"
+	@$(CLI) compile -b $(BOARD) --output-dir build $(SKETCH)
+
+clean:
+	@echo -e "$(GREEN)🛠️  Removing build files...$(CLEAR)"
+	@rm -rf build/
+
+prepare_and_compile:
+	make prepare --no-print-directory
+	make compile --no-print-directory
+
+upload:
+	@echo -e "$(GREEN)🚀  Uploading $(SKETCH)...$(CLEAR)"
+	@$(CLI) upload -b $(BOARD) -p $(PORT)
+
+upload_verbose:
+	@echo -e "$(GREEN)🚀  Uploading (Verbose) $(SKETCH)...$(CLEAR)"
+	@$(CLI) upload -b $(BOARD) -p $(PORT) -v
+
+monitor:
+	@$(CLI) monitor -p $(PORT)
+
+run:
+	make compile --no-print-directory
+	make upload --no-print-directory
+	make monitor --no-print-directory
+
+run_init:
+	make prepare --no-print-directory
+	make run --no-print-directory

README.md

@@ -1,3 +1,68 @@
-# arduino_pong
+# 🏓 Arduino UNO R4 WiFi Pong
 
-Play Pong on Arduino UNO R4 WiFi LED Matrix
+A classic implementation of the Pong game developed specifically for the Arduino UNO R4 WiFi, utilizing its built-in 12×8 LED matrix as the game screen.
+
+[![Arduino Pong CI](https://github.com/Dea1993/arduino_pong/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/Dea1993/arduino_pong/actions/workflows/ci.yml)
+[![Arduino Pong CD](https://github.com/Dea1993/arduino_pong/actions/workflows/cd.yml/badge.svg)](https://github.com/Dea1993/arduino_pong/actions/workflows/cd.yml)
+[![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](LICENSE)
+
+# 📹 Preview
+
+![Pong](assets/preview.png)
+
+Youtube: https://youtu.be/ouLBTDjpKqc
+
+# 📝 Description
+
+This project transforms your Arduino board into a minimalist handheld console. By leveraging the Arduino_LED_Matrix library, the game manages ball physics, collision detection with walls and paddles, and a scoring system displayed via the Serial Monitor.
+
+Key Features:
+
+- Integrated Display: No external modules required; it uses the native 12×8 LED matrix.
+- Local Multiplayer: Two-player support using 4 external pushbuttons.
+- Dynamic Difficulty: The ball speed periodically increases to keep the gameplay challenging.
+- Real-time Scoring: Points are tracked and sent via Serial (9600 baud).
+
+# 🛠️ Hardware Requirements
+
+- Board: Arduino UNO R4 WiFi.
+- Buttons: 4x Momentary Pushbuttons.
+- Resistors: Not required (uses internal INPUT_PULLUP).
+- Breadboard & Jumper wires.
+
+# 🖮 Pinout Configuration
+
+Component	Arduino Pin	Function
+
+- P1 Button Up	D13	Moves Left Paddle Up
+- P1 Button Down	D12	Moves Left Paddle Down
+- P2 Button Up	D11	Moves Right Paddle Up
+- P2 Button Down	D10	Moves Right Paddle Down
+- Common GND	GND	Ground for all buttons
+
+# 🕹️ Game Logic
+
+- Bouncing: When the ball hits a paddle, the X direction is reversed and the hits counter increases.
+- Speed Scaling: Every 6 successful hits (hits >= 6), the loop_delay decreases by 20ms, speeding up the action until a minimum limit of 80ms is reached.
+- Scoring: If a player misses the ball, the opponent scores a point. The ball then resets to the center with a randomized direction.
+
+# 🛠️ Development
+
+This project includes a `Makefile` to automate the workflow using `arduino-cli`.
+
+### Prerequisites
+* [Arduino CLI](https://arduino.github.io/arduino-cli/latest/) installed.
+* Arduino UNO R4 core installed: 
+  `arduino-cli core install arduino:renesas_uno`
+
+### Commands
+| Command | Description |
+| :--- | :--- |
+| `make prepare` | Downloads arduino-cli locally and installs the UNO R4 core. |
+| `make compile` | Compiles the sketch without uploading. |
+| `make upload` | Uploads the compiled binary to `/dev/ttyACM0`. |
+| `make monitor` | Opens the Serial Monitor. |
+| `make run` | Full cycle: Compile + Upload + Monitor. |
+| `make run_init` | Full first-time setup: Prepare env + Compile + Upload + Monitor. |
+
+> **Note:** If your board is on a different port, edit the `Makefile` or override it: `make upload PORT=/dev/ttyUSB0`.

arduino_pong.ino

@@ -0,0 +1,64 @@
+#include "Arduino_LED_Matrix.h"
+
+#include "config.h"
+#include "pong_render.h"
+#include "pong_player.h"
+#include "pong_ball.h"
+
+// create LED matrix object
+ArduinoLEDMatrix matrix;
+
+// initial pong frame matrix
+byte frame[MATRIX_HEIGHT][MATRIX_WIDTH] = {
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },
+  { 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 },
+  { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
+};
+
+// players coordinates
+int p1_start= 1;
+int p2_start= 4;
+
+// initials balls coordinates
+int ball_x= BALL_RESET_X;
+int ball_y= BALL_RESET_Y;
+
+int need_refresh= 1;
+
+int ball_delay= INITIAL_BALL_DELAY;
+
+long exec_t2= millis();
+
+
+void setup() {
+  Serial.begin(9600);
+  // start LED matrix
+  matrix.begin();
+  pinMode(P1_BTN_UP, INPUT_PULLUP);
+  pinMode(P1_BTN_BOTTOM, INPUT_PULLUP);
+  pinMode(P2_BTN_UP, INPUT_PULLUP);
+  pinMode(P2_BTN_BOTTOM, INPUT_PULLUP);
+
+  randomSeed(millis());
+}
+
+void loop() {
+  long exec_t1= millis();
+  pong_move_p1(p1_start, need_refresh);
+  pong_move_p2(p2_start, need_refresh);
+  if (exec_t1 - exec_t2 > ball_delay) {
+    move_ball(ball_x, ball_y, ball_delay, p1_start, p2_start, need_refresh);
+    exec_t2= exec_t1;
+  }
+  if (need_refresh) {
+    render_matrix(frame, p1_start, p2_start, ball_x, ball_y);
+    matrix.renderBitmap(frame, MATRIX_HEIGHT, MATRIX_WIDTH);
+    need_refresh= 0;
+  }
+  delay(50);
+}

config.h

@@ -0,0 +1,11 @@
+#define P1_BTN_UP 13
+#define P1_BTN_BOTTOM 12
+#define P2_BTN_UP 11
+#define P2_BTN_BOTTOM 10
+
+#define MATRIX_WIDTH 12
+#define MATRIX_HEIGHT 8
+#define BALL_RESET_X (MATRIX_WIDTH / 2)
+#define BALL_RESET_Y (MATRIX_HEIGHT / 2)
+#define BAR_LENGTH 3
+#define INITIAL_BALL_DELAY 200

pong_ball.cpp

@@ -0,0 +1,88 @@
+#include <Arduino.h>
+#include "config.h"
+#include "pong_player.h"
+
+// used to increase speed when game is too easy
+int hits= 0;
+
+int p1_score= 0;
+int p2_score= 0;
+
+// initially ball has no movements
+// once game/round starts, balls gets random x and y movements
+int ball_move_x= 0;
+int ball_move_y= 0;
+
+void point_scored(int &ball_x, int &ball_y, int &ball_delay) {
+  ball_x= BALL_RESET_X;
+  ball_y= BALL_RESET_Y;
+  Serial.print("P1: ");
+  Serial.print(p1_score);
+  Serial.print(" - ");
+  Serial.print("P2: ");
+  Serial.print(p2_score);
+  Serial.println();
+
+  hits= 0;
+  ball_delay= INITIAL_BALL_DELAY;
+}
+
+void move_ball(int &ball_x, int &ball_y, int &ball_delay, int p1_start, int p2_start, int &need_refresh) {
+  need_refresh= 1;
+  if (ball_x < 0 || ball_x > MATRIX_WIDTH-1 || ball_y < 0 || ball_y > MATRIX_HEIGHT-1) {
+    // ball out of matrix limits
+    ball_x= BALL_RESET_X;
+    ball_y= BALL_RESET_Y;
+    return;
+  }
+  
+  // if ball is not moving, get random direction
+  // this is the initial position
+  if (ball_move_x == 0 || ball_move_y == 0) {
+    // extract random number between 0 or 1 to select the directions
+    if (random(2) == 0) ball_move_x= 1;
+    else ball_move_x= -1;
+    if (random(2) == 0) ball_move_y= 1;
+    else ball_move_y= -1;
+  }
+
+  else if (ball_x == 0) {
+    // if p1 collision: reverse x, go left
+    if (!ball_player_collision(p1_start, ball_y)) {
+      // else p2 score, reset board
+      p2_score += 1;
+      Serial.println("Player 2 Scores");
+      point_scored(ball_x, ball_y, ball_delay);
+    }
+    else {
+      hits += 1;
+      ball_move_x= ball_move_x * -1;
+    }
+  }
+  else if (ball_x == MATRIX_WIDTH-1) {
+    if (!ball_player_collision(p2_start, ball_y)) {
+      // else p1 score, reset board
+      p1_score += 1;
+      Serial.println("Player 1 Scores");
+      point_scored(ball_x, ball_y, ball_delay);
+    }
+    else {
+      hits += 1;
+      ball_move_x= ball_move_x * -1;
+    }
+  }
+
+  if (ball_y == 0 || ball_y == MATRIX_HEIGHT-1) {
+    // reverse y, go down
+    ball_move_y= ball_move_y * -1;
+  }
+
+  if (hits >= 6 && ball_delay >= 80) {
+    // increase ball speed
+    hits = 0;
+    ball_delay -= 20;
+  }
+
+  ball_x+= ball_move_x;
+  ball_y+= ball_move_y;
+}

pong_ball.h

@@ -0,0 +1,7 @@
+#ifndef PONG_BALL_H
+#define PONG_BALL_H
+
+void point_scored();
+void move_ball(int &ball_x, int &ball_y, int &loop_delay, int p1_start, int p2_start, int &need_refresh);
+
+#endif

pong_player.cpp

@@ -0,0 +1,33 @@
+#include <Arduino.h>
+#include "config.h"
+
+int ball_player_collision(int player, int ball_y) {
+  for (int p= player; p < player + BAR_LENGTH; p++) {
+    if (ball_y == p) {
+      return 1;
+    }
+  }
+  return 0;
+}
+
+int pong_move_p1(int &p1_start, int &need_refresh) {
+  if (digitalRead(P1_BTN_UP) == LOW && p1_start > 0) {
+    p1_start -= 1;
+    need_refresh= 1;
+  }
+  else if (digitalRead(P1_BTN_BOTTOM) == LOW && p1_start < 5) {
+    p1_start += 1;
+    need_refresh= 1;
+  }
+}
+
+int pong_move_p2(int &p2_start, int &need_refresh) {
+  if (digitalRead(P2_BTN_UP) == LOW && p2_start > 0) {
+    p2_start -= 1;
+    need_refresh= 1;
+  }
+  else if (digitalRead(P2_BTN_BOTTOM) == LOW && p2_start < 5) {
+    p2_start += 1;
+    need_refresh= 1;
+  }
+}

pong_player.h

@@ -0,0 +1,8 @@
+#ifndef PONG_PLAYER_H
+#define PONG_PLAYER_H
+
+int ball_player_collision(int player, int ball_y);
+int pong_move_p1(int &p1_start, int &need_refresh);
+int pong_move_p2(int &p2_start, int &need_refresh);
+
+#endif

pong_render.cpp

@@ -0,0 +1,22 @@
+#include <Arduino.h>
+#include "config.h"
+
+void render_matrix(byte frame[MATRIX_HEIGHT][MATRIX_WIDTH], int p1_start, int p2_start, int ball_x, int ball_y) {
+  // clear
+  for (int x=0; x < MATRIX_WIDTH; x++) {
+    for (int y=0; y < MATRIX_HEIGHT; y++) {
+      frame[y][x]= 0;
+    }
+  }
+  
+  // players coords
+  for (int i= p1_start; i < p1_start+BAR_LENGTH; i++) {
+    frame[i][0]= 1;
+  }
+  for (int i= p2_start; i < p2_start+BAR_LENGTH; i++) {
+    frame[i][MATRIX_WIDTH-1]= 1;
+  }
+  
+  // ball coords
+  frame[ball_y][ball_x]= 1;
+}

pong_render.h

@@ -0,0 +1,9 @@
+#ifndef PONG_RENDER_H
+#define PONG_RENDER_H
+
+#include <Arduino.h>
+#include "Arduino_LED_Matrix.h"
+
+void render_matrix(byte frame[MATRIX_HEIGHT][MATRIX_WIDTH], int p1_start, int p2_start, int ball_x, int ball_y);
+
+#endif