generate build files for cd

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 +1,37 @@
+name: Arduino Pong CI
+
+on:
+  push:
+    branches: [ master ]
+    paths:
+      - 'arduino_pong.ino'
+      - 'Makefile'
+      - '.github/workflows/ci.yml'
+
+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

@@ -1,16 +1,63 @@
+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; \
+		$(CLI) core install arduino:renesas_uno; \
+	fi
+
 compile:
-	arduino-cli compile -b arduino:renesas_uno:unor4wifi ./arduino_pong.ino
+	@mkdir -p build
+	@echo -e "$(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:
-	arduino-cli upload -b arduino:renesas_uno:unor4wifi -p /dev/ttyACM0
+	@echo -e "$(GREEN)🚀  Uploading $(SKETCH)...$(CLEAR)"
+	@$(CLI) upload -b $(BOARD) -p $(PORT)
 
 upload_verbose:
-	arduino-cli upload -b arduino:renesas_uno:unor4wifi -p /dev/ttyACM0 -v
+	@echo -e "$(GREEN)🚀  Uploading (Verbose) $(SKETCH)...$(CLEAR)"
+	@$(CLI) upload -b $(BOARD) -p $(PORT) -v
 
 monitor:
-	arduino-cli monitor -p /dev/ttyACM0
+	@$(CLI) monitor -p $(PORT)
 
 run:
-	make compile
+	make compile --no-print-directory
-	make upload
+	make upload --no-print-directory
-	make monitor
+	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](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

@@ -4,12 +4,14 @@
 #define P1_BTN_BOTTOM 12
 #define P2_BTN_UP 11
 #define P2_BTN_BOTTOM 10
+#define MATRIX_WIDTH 12
+#define MATRIX_HEIGHT 8
 
 // create LED matrix object
 ArduinoLEDMatrix matrix;
 
 // initial pong frame
-byte frame[8][12] = {
+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 },
@@ -28,8 +30,8 @@ int p2_start= 4;
 int p2_end= 6;
 
 // initials balls coordinates
-int ball_reset_x=6;
+int ball_reset_x= MATRIX_WIDTH / 2;
-int ball_reset_y=3;
+int ball_reset_y= MATRIX_HEIGHT / 2;
 int ball_x= ball_reset_x;
 int ball_y= ball_reset_y;
 
@@ -42,7 +44,13 @@ int bar_length= 3;
 int p1_score= 0;
 int p2_score= 0;
 
-int loop_delay= 220;
+int need_refresh= 1;
+
+int initial_loop_delay= 200;
+int loop_delay= initial_loop_delay;
+// used to increase speed when game is too easy
+int hits= 0;
+
 long exec_t2= millis();
 
 void setup() {
@@ -59,10 +67,11 @@ void setup() {
 }
 
 void render_matrix() {
+  if (!need_refresh) return;
+  need_refresh= 0;
   // clear
-  for (int x=0; x < 12; x++) {
+  for (int x=0; x < MATRIX_WIDTH; x++) {
-    for (int y=0; y < 8; y++) {
+    for (int y=0; y < MATRIX_HEIGHT; y++) {
-      frame[y][x]= 0;
       frame[y][x]= 0;
     }
   }
@@ -72,42 +81,71 @@ void render_matrix() {
     frame[i][0]= 1;
   }
   for (int i= p2_start; i < p2_start+bar_length; i++) {
-    frame[i][11]= 1;
+    frame[i][MATRIX_WIDTH-1]= 1;
   }
   
   // ball coords
   frame[ball_y][ball_x]= 1;
 
-  matrix.renderBitmap(frame, 8, 12);
+  matrix.renderBitmap(frame, MATRIX_HEIGHT, MATRIX_WIDTH);
 }
 
 void pong_move_p1() {
   if (digitalRead(P1_BTN_UP) == LOW && p1_start > 0) {
     p1_start -= 1;
-    Serial.print("P1 up: ");
+    need_refresh= 1;
-    Serial.println(p1_start);
+  }
-   }
   else if (digitalRead(P1_BTN_BOTTOM) == LOW && p1_start < 5) {
     p1_start += 1;
-    Serial.print("P1 down: ");
+    need_refresh= 1;
-    Serial.println(p1_start);
   }
 }
 
 void pong_move_p2() {
   if (digitalRead(P2_BTN_UP) == LOW && p2_start > 0) {
     p2_start -= 1;
-    Serial.print("P2 up: ");
+    need_refresh= 1;
-    Serial.println(p2_start);
   }
   else if (digitalRead(P2_BTN_BOTTOM) == LOW && p2_start < 5) {
     p2_start += 1;
-    Serial.print("P2 down: ");
+    need_refresh= 1;
-    Serial.println(p2_start);
   }
 }
 
+int ball_player_collision(int player) {
+  for (int p= player; p < player + bar_length; p++) {
+    if (ball_y == p) {
+      return 1;
+    }
+  }
+  return 0;
+}
+
+void point_scored() {
+  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;
+  loop_delay= initial_loop_delay;
+}
+
 void move_ball() {
+  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;
@@ -118,55 +156,41 @@ void move_ball() {
 
   else if (ball_x == 0) {
     // if p1 collision: reverse x, go left
-    int hit= 0;
+    if (!ball_player_collision(p1_start)) {
-    for (int p1= p1_start; p1 < p1_start + bar_length; p1++) {
-      if (ball_y == p1) {
-        ball_move_x= ball_move_x * -1;
-        hit= 1;
-        break;
-      }
-    }
-
-    if (!hit) {
       // else p2 score, reset board
-      ball_x= ball_reset_x;
-      ball_y= ball_reset_y;
       p2_score += 1;
-
+      Serial.println("Player 2 Scores");
-      Serial.print("Player 2 score: ");
+      point_scored();
-      Serial.println(p2_score);
+    }
-      Serial.print("Player 1 score: ");
+    else {
-      Serial.println(p1_score);
+      hits += 1;
+      ball_move_x= ball_move_x * -1;
     }
   }
-  else if (ball_x == 11) {
+  else if (ball_x == MATRIX_WIDTH-1) {
-    int hit= 0;
+    if (!ball_player_collision(p2_start)) {
-    for (int p2= p2_start; p2 < p2_start + bar_length; p2++) {
-    // if p2 collision: reverse x, go left
-      if (ball_y == p2) {
-        ball_move_x= ball_move_x * -1;
-        hit= 1;
-        break;
-      }
-    }
-    
-    if (!hit) {
       // else p1 score, reset board
-      ball_x= ball_reset_x;
-      ball_y= ball_reset_y;
       p1_score += 1;
-      Serial.print("Player 2: ");
+      Serial.println("Player 1 Scores");
-      Serial.println(p2_score);
+      point_scored();
-      Serial.print("Player 1: ");
+    }
-      Serial.println(p1_score);
+    else {
+      hits += 1;
+      ball_move_x= ball_move_x * -1;
     }
   }
 
-  else if (ball_y == 0 || ball_y == 7) {
+  if (ball_y == 0 || ball_y == MATRIX_HEIGHT-1) {
     // reverse y, go down
     ball_move_y= ball_move_y * -1;
   }
 
+  if (hits >= 6 && loop_delay >= 80) {
+    // increase ball speed
+    hits = 0;
+    loop_delay -= 20;
+  }
+
   ball_x+= ball_move_x;
   ball_y+= ball_move_y;
 }
@@ -180,5 +204,5 @@ void loop() {
     move_ball();
     exec_t2= exec_t1;
   }
-  delay(10);
+  delay(50);
 }