Arduino 9 Arduino Pong
Someone requested that I make the game Pong on a 16 x 2 LCD panel and so I start doing that in this tutorial. I’m going to live code everything with no preparation ahead of time, so that you can see how I solve this problem.
I focus this time on drawing on the LCD panel, moving the paddles and processing user input along with much more. All of the code and a transcript are found below.
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Code from the Video
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#include <LiquidCrystal.h> LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // Holds paddle data in 2 separate arrays for easy // character printing // Characters LEDs are turned on by marking them as // boolean true or false and then converting from binary // to base 10 16 = 10000 where binary digits go 16 8 4 2 1 // byte aiPaddleArray[2][8] = {0,0,0,0,0,1,1,1}; byte myPaddleArray[2][8] = {0,0,0,0,0,16,16,16}; // Used to make logic easier for when moving paddles byte aiPaddleColArray[16] = {0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0}; byte myPaddleColArray[16] = {0,0,0,0,0,16,16,16,0,0,0,0,0,0,0,0}; // Holds middle pixel for each paddle byte aiPaddlePos = 6; byte myPaddlePos = 6; // Buttons that move the paddle const int moveRightButton = 8; const int moveLeftButton = 7; // Stores whether buttons have been pressed int rightButState = 0; int leftButState = 0; // Store previous button state so we only count input once int rightLastButState = 0; int leftLastButState = 0; // 0 out all the paddle leds void ClearPaddles(){ for(int i = 0; i < 2; i++){ for(int j = 0; j < 8; j++){ aiPaddleArray[i][j] = 0; myPaddleArray[i][j] = 0; } } } void PrintPaddles(){ // Grab the character array stored in myPaddleArray using a pointer byte* mPTemp1 = myPaddleArray[0]; byte* mPTemp2 = myPaddleArray[1]; byte* aiPTemp1 = aiPaddleArray[0]; byte* aiPTemp2 = aiPaddleArray[1]; // Each character must have a unique character ID and array to print lcd.createChar(0, mPTemp1); lcd.createChar(1, mPTemp2); lcd.createChar(2, aiPTemp1); lcd.createChar(3, aiPTemp2); // Move cursor to 13 column on the 1st row lcd.setCursor(14, 0); // Draw the character lcd.write(byte(0)); lcd.setCursor(14, 1); lcd.write(byte(1)); lcd.setCursor(1, 0); lcd.write(byte(2)); lcd.setCursor(1, 1); lcd.write(byte(3)); for(int i = 0; i < 8; i++){ Serial.println(mPTemp1[i]); } } // Clear paddle characters and then add character data void SetupPaddles(){ ClearPaddles(); myPaddleArray[0][5] = 16; myPaddleArray[0][6] = 16; myPaddleArray[0][7] = 16; aiPaddleArray[0][5] = 1; aiPaddleArray[0][6] = 1; aiPaddleArray[0][7] = 1; PrintPaddles(); } void MovePaddleUp(){ // Make sure the paddle can't go off the board if(myPaddlePos != 1){ // Decrementing the paddle moves it up myPaddlePos--; UpdatePaddlesAfterMove(); } } void MovePaddleDown(){ if(myPaddlePos != 14){ myPaddlePos++; UpdatePaddlesAfterMove(); } } void UpdatePaddlesAfterMove(){ // Cycle through all bools turning on the next 1 above and off the 1 below for(int i = 0; i < 16; i++){ if((i == (myPaddlePos-1)) || (i == myPaddlePos) || (i == (myPaddlePos+1))){ myPaddleColArray[i] = 16; } else { myPaddleColArray[i] = 0; } } // Update the arrays used for printing the paddle characters for(int j = 0; j < 8; j++){ myPaddleArray[0][j] = myPaddleColArray[j]; } for(int k = 8; k < 16; k++){ myPaddleArray[1][k-8] = myPaddleColArray[k]; } } void setup() { Serial.begin(9600); // State that the display has 2 rows with 16 // characters per row lcd.begin(16, 2); // Setup buttons so we can receive input pinMode(moveRightButton, INPUT); pinMode(moveLeftButton, INPUT); // Print paddles on the screen SetupPaddles(); } void loop() { // Get current button state rightButState = digitalRead(moveRightButton); leftButState = digitalRead(moveLeftButton); 1 // Check the button state change if(rightButState != rightLastButState){ // Check if button was pressed if(rightButState == HIGH){ // Move paddle up if you can and redraw MovePaddleUp(); PrintPaddles(); } // Added to avoid bouncing delay(50); // Store last button state rightLastButState = rightButState; } // Check the button state change if(leftButState != leftLastButState){ // Check if button was pressed if(leftButState == HIGH){ // Move paddle up if you can and redraw MovePaddleDown(); PrintPaddles(); } // Added to avoid bouncing delay(50); // Store last button state leftLastButState = leftButState; } } |
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