colour(BLACK); myScreen.line(formerBallXPos + 2, formerBallYPos + 3, formerBallXPos + 6, formerBallYPos + 3);<\/code><\/li>\r\n<\/ol>\r\nSo rectangles are simply flanged and cut off. The BALLDELAYS after steps 2 and 4 can be used to control the speed of the game and the appearance of the tail that cannot be completely prevented. Just try it yourself. <\/p>\r\n\n
The moveRacketsToNewPos function<\/h4>\n
In order to make the movement of the racket fluid, the pixels are attached line by line and cut off at the bottom until the racket is in the current position during an upward movement. For the downward movement, the procedure is correspondingly reversed. With the rackets, just like the ball, a simple deletion and drawing from scratch looked quite modest.<\/p>\r\n\n
The Racket Library <\/h3>\n
Now to the more relevant parts of the Racket library. Essentially, it is about translating the voltage at the potentiometers into the respective y-position of the racket. Here is the class definition from Racket.h:<\/p>\r\n
class\u00a0Racket{\r\n\u00a0\u00a0public:\r\n\u00a0\u00a0\u00a0\u00a0Racket();\r\n\u00a0\u00a0\u00a0\u00a0Racket(int,\u00a0int);\r\n\u00a0\u00a0\u00a0\u00a0void\u00a0setXPos(int);\r\n\u00a0\u00a0\u00a0\u00a0int\u00a0getXPos();\r\n\u00a0\u00a0\u00a0\u00a0int\u00a0getYPos();\r\n\u00a0\u00a0\u00a0\u00a0void\u00a0move();\r\n\u00a0\u00a0\u00a0\u00a0\r\n\u00a0\u00a0private:\r\n\u00a0\u00a0\u00a0\u00a0int\u00a0xPos;\r\n\u00a0\u00a0\u00a0\u00a0int\u00a0yPos;\r\n\u00a0\u00a0\u00a0\u00a0int\u00a0potiPin;\r\n\u00a0\u00a0\u00a0\u00a0const\u00a0int\u00a0racketHeight\u00a0=\u00a012;\r\n\u00a0\u00a0\u00a0\u00a0const\u00a0int\u00a0topScreenBorder\u00a0=\u00a00;\r\n\u00a0\u00a0\u00a0\u00a0const\u00a0int\u00a0downScreenBorder\u00a0=\u00a0127;\r\n\u00a0\u00a0\u00a0\u00a0const\u00a0int\u00a0minPotiVal\u00a0=\u00a0160;\r\n\u00a0\u00a0\u00a0\u00a0const\u00a0int\u00a0maxPotiVal\u00a0=\u00a0700;\r\n};<\/pre>The function in Racket.cpp to determine the y-position is called getYPos:<\/p>\r\n
int\u00a0Racket::getYPos(){\r\n\u00a0\u00a0int\u00a0yPosRaw;\u00a0\r\n\u00a0\u00a0yPosRaw\u00a0=\u00a0analogRead(potiPin);\r\n\u00a0\u00a0if\u00a0(yPosRaw<minPotiVal)\u00a0yPosRaw\u00a0=\u00a0minPotiVal;\r\n\u00a0\u00a0if\u00a0(yPosRaw>maxPotiVal)\u00a0yPosRaw\u00a0=\u00a0maxPotiVal;\r\n\u00a0\u00a0return(map(yPosRaw,minPotiVal,maxPotiVal,0,downScreenBorder-racketHeight));\u00a0\r\n}<\/pre>Not the entire voltage range of the potentiometer is used, as the control must be usable. Above and below maxPotiVal and minPotiVal, the racket stops at the limit. <\/p>\r\n\n
The Ball library<\/h3>\n
The Ball Library is again a bit more complex and needs some explanations. I would like to explain a few functions in more detail.<\/p>\r\n\n
Function newBall<\/h4>\nvoid\u00a0Ball::newBall(){\r\n\u00a0\u00a0int\u00a0randomNumber;\r\n\u00a0\u00a0randomNumber\u00a0=\u00a0random(0,999);\r\n\u00a0\u00a0yPos\u00a0=\u00a06\u00a0+(random((downScreenBorder-6)\/2))*2;\r\n\u00a0\u00a0if(flightDir==NEW_BALL)\u00a0(((random(0,999))%2)==0)?(flightDir\u00a0=\u00a0DIR_LU):(flightDir\u00a0=\u00a0DIR_RD);\r\n\u00a0\u00a0if((flightDir==DIR_LD)\u00a0||\u00a0(flightDir==DIR_LU)){\r\n\u00a0\u00a0\u00a0\u00a0(((randomNumber)%2)==0)?(flightDir\u00a0=\u00a0DIR_RU):(flightDir\u00a0=\u00a0DIR_RD);\r\n\u00a0\u00a0\u00a0\u00a0xPos=leftScreenBorder; \r\n\u00a0\u00a0}\r\n\u00a0\u00a0else\u00a0if((flightDir==DIR_RD)\u00a0||\u00a0(flightDir==DIR_RU)){\r\n\u00a0\u00a0\u00a0\u00a0(((randomNumber)%2)==0)?(flightDir\u00a0=\u00a0DIR_LU):(flightDir\u00a0=\u00a0DIR_LD);\r\n\u00a0\u00a0\u00a0\u00a0xPos=rightScreenBorder; \r\n\u00a0\u00a0}\r\n}<\/pre>If a new ball comes into play at the beginning of the game, then it has no direction (NEW_BALL). It then gets the direction DIR_LU or DIR_RD by random generator. If there is no start to the game, then the ball has already got a direction and one side has just made a point. The direction should then change (start for the player who did not get the last point). The second if construct also ensures that not only DIR_LU or DIR_RD is set as direction at the start of the game, which is the result of the first if construct. <\/p>\r\n\n
Functions fenceCheck and goalCheck<\/h4>\nvoid\u00a0Ball::fenceCheck(){\r\n\u00a0\u00a0if(yPos==0){\r\n\u00a0\u00a0\u00a0\u00a0if(flightDir==DIR_LU)\u00a0flightDir\u00a0=\u00a0DIR_LD;\r\n\u00a0\u00a0\u00a0\u00a0else\u00a0if(flightDir==DIR_RU)\u00a0flightDir\u00a0=\u00a0DIR_RD;\r\n\u00a0\u00a0}\r\n\u00a0\u00a0else\u00a0if(yPos==124){\r\n\u00a0\u00a0\u00a0\u00a0if(flightDir==DIR_LD)\u00a0flightDir\u00a0=\u00a0DIR_LU;\r\n\u00a0\u00a0\u00a0\u00a0else\u00a0if(flightDir==DIR_RD)\u00a0flightDir\u00a0=\u00a0DIR_RU;\r\n\u00a0\u00a0}\r\n}\r\n\r\nbool\u00a0Ball::goalCheck(){\r\n\u00a0\u00a0if((xPos==leftScreenBorder)&&((flightDir==DIR_LD)||(flightDir==DIR_LU)))\u00a0return\u00a0true;\r\n\u00a0\u00a0else\u00a0if\u00a0((xPos==rightScreenBorder)&&((flightDir==DIR_RU)||(flightDir==DIR_RD)))\u00a0return\u00a0true;\r\n\u00a0\u00a0else\u00a0return\u00a0false;<\/pre>These functions are relatively simple. The fenceCheck function checks whether the ball has hit the top or bottom boarder. In this case, the direction must be changed accordingly. Note the extent of the ball and the position of its reference pixel at the top left. At the top, the ball hits directly with its reference point, i.e. at y = 0. At the bottom, the ball hits at y = 124 and not at 127. At first I thought that would happen at 127 – ball edge length, so at 123. Mistake in thinking!<\/p>\r\n
The function goalCheck checks whether the goal line has been crossed. In contrast to the fenceCheck, the line should actually be crossed. The ball crosses halfway the line and then disappears completely. Therefore, in Ball.h leftScreenBorder is defined as -2 and rightScreenBorder as 158. <\/p>\r\n\n
Function racketHitCheck<\/h4>\nvoid\u00a0Ball::racketHitCheck(const\u00a0int\u00a0&left_xp,\u00a0int\u00a0&left_yp,\u00a0const\u00a0int\u00a0&right_xp,\u00a0int\u00a0&right_yp,\u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0const\u00a0int\u00a0&ball_width,\u00a0const\u00a0int\u00a0&height,\u00a0const\u00a0int\u00a0&width){\r\n\u00a0\u00a0if((xPos==(left_xp\u00a0+\u00a0width))\u00a0&&\u00a0(yPos>=(left_yp-ball_width))\u00a0&&\u00a0(yPos<=(left_yp+height))){\r\n\u00a0\u00a0\u00a0\u00a0if(flightDir==DIR_LU)\u00a0flightDir\u00a0=\u00a0DIR_RU;\r\n\u00a0\u00a0\u00a0\u00a0else\u00a0if(flightDir==DIR_LD)\u00a0flightDir\u00a0=\u00a0DIR_RD;\r\n\u00a0\u00a0} \r\n\u00a0\u00a0else\u00a0if(xPos==(right_xp-ball_width)\u00a0&&\u00a0(yPos>=(right_yp-ball_width))\u00a0&&\u00a0(yPos<=(right_yp+height))){\r\n\u00a0\u00a0\u00a0\u00a0if(flightDir==DIR_RU)\u00a0flightDir\u00a0=\u00a0DIR_LU;\r\n\u00a0\u00a0\u00a0\u00a0else\u00a0if(flightDir==DIR_RD)\u00a0flightDir\u00a0=\u00a0DIR_LD;\r\n\u00a0\u00a0}\r\n}<\/pre>The racketHitCheck function checks whether a racket has been hit. The current position of the racket must be passed to the racketHitCheck function and the dimensions of the racket and the ball must be taken into account. In addition, the racket should only be active into the direction of the playing field. When a new ball comes into play and hits the racket from the other side, it shall be ignored. However, in this case he tears a hole in the racket, which is “healed” again when the racket moves. Shuting down this behaviour was simply too cumbersome for me. <\/p>\r\n\n
Final words<\/h2>\n
As you may have seen, the programming of Pong for Arduino is a bit more complex than you might imagine at first. At least for me as a hobby programmer this was quite challenging. Originally, I had the idea to program the whole thing in a way that you can also use other screen sizes or easily switch between tennis and a one-player squash mode. Perhaps others may continue to do so.<\/p>\r\n
I also realize that one or the other place is not completely “clean” programmed although it works. Nevertheless, I hope that it is a useful and above all fun suggestion for you. I welcome any feedback!<\/p>\r\n","protected":false},"excerpt":{"rendered":"
A simple version of Pong, realized with an Arduino for a 1.8 inch display. Hardware and Sketch are described in detail. <\/p>\n","protected":false},"author":1,"featured_media":8144,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[571],"tags":[775,779,778],"class_list":["post-9355","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-projects","tag-pong-en","tag-pong-for-arduino-en","tag-teletennis-en-2"],"yoast_head":"\n
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