Help with code?


I’m trying to load a program I made onto the arduboy, but it just stays stuck on the arduboy screen when I upload it. Any ideas? I do have arduboy.begin(); and arduboy.clear(); at the start of setup.


Without seeing any code It’s hard to tell what’s wrong. As a base you need someting like this:

#include <Arduboy2.h>

void setup()

void loop()
  if (!arduboy.nextFrame()) return;

 //your code here

Here's a mini example sketch
//Using Arduboy2 library mini example

#include <Arduboy2.h> // include Arduboy2 library
#include <ab_logo.c>  // include Arduboy logo graphic

//constant values
constexpr uint8_t AB_LOGO_WIDTH = 88; 
constexpr uint8_t AB_LOGO_HEIGHT = 16;

Arduboy2 arduboy;

//assign values;
int16_t x    = (WIDTH - AB_LOGO_WIDTH) / 2;
int16_t y    = 25;
int8_t  xDir = 1;
int8_t  yDir = 1;

void setup() {
  arduboy.begin(); //initialisation with startup logo
  //arduboy.setFrameRate(60); //Only needed when frameRate != 60

void loop() {
  if (!arduboy.nextFrame() ) return; // Do nothing until it's time for the next frame

  //program code
  arduboy.drawBitmap(x, y, arduboy_logo, AB_LOGO_WIDTH, AB_LOGO_HEIGHT); 
  x += xDir;
  y += yDir;
  if (x == 0 || x == WIDTH - AB_LOGO_WIDTH) xDir = -xDir;
  if (y == 0 || y == HEIGHT - AB_LOGO_HEIGHT) yDir = -yDir;
  arduboy.display(CLEAR_BUFFER); //clears display after displaying display buffer

It worked! Thank you! And one more question, how do I stop text from instantly disappearing?


usually you redraw everything you want to see on the display for each frame.

(Pharap) #5

Should be (!arduboy.nextFrame()).
arduboy.nextFrame() returns bool, not int.

You shouldn’t include .c files,
aside from the fact they’re supposed to be C and not C++,
you could end up with multiple definition errors.

Though I admit, the Arduboy2 library needs a better way of granting access to the logo(s).
Either by changing ab_logo.c to a header file,
or by introducing a correpsonding header file.

Draw it in loop.

When loop ends, it (almost) immediately starts again.

Here’s a “Hello World” program:

#include <Arduboy2.h>

Arduboy2 arduboy;

void setup(void)

void loop(void)


	arduboy.println(F("Hello World"));

Oops your right, fixed for future reference

It’s the only way. But I agree, it should have been an header file instead. But even Arduino gives a a bad example with their wiring.c

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Now It’s saying it can’t compile it for the arduboy. Here’s the attempted code :P…

#include <Arduboy2.h>
#include <ab_logo.c>
Arduboy2 arduboy;
constexpr uint8_t AB_LOGO_WIDTH = 88;
constexpr uint8_t AB_LOGO_HEIGHT = 16;
int playerHP;
int playerXP;
int swords[7] = {1, 2, 3, 4, 5, 6, 7};
int armor[7] = {1, 2, 3, 4, 5, 6, 7};
void setup() {
  //starter stats
  playerHP = 20;
  playerXP = 0;
  swords[1] = "Rusty Shortsword";
  swords[2] = "Iron Shortsword";
  swords[3] = "Iron Longsword";
  swords[4] = "Elvish Shortsword";
  swords[5] = "Elvish Longsword";
  swords[6] = "Enchanted Shortsword";
  swords[7] = "Emerald Greatsword";  
  armor[1] = "Common Garb";
  armor[2] = "Leather Tunic";
  armor[3] = "Chainmail";
  armor[4] = "Iron Chestplate";
  armor[5] = "Elvish Chestplate";
  armor[5] = "Dwarvish Chestplate";
  armor[6] = "Enchanted Chestplate";
  armor[7] = "Dragon Scales";
void loop() {
  if (!arduboy.nextFrame()) 
  if( arduboy.pressed(B_BUTTON) == true ) {
    arduboy.print(F("Level:" + playerXP ));
    arduboy.print(F("Sword:" + swords[1] ));
    arduboy.print(F("Armor:" + armor[1] ));
    arduboy.print(F("HP:" + playerHP ));
(Scott) #8


I’ve formatted the code that you posted by enclosing it as a code block. In the future, please do so yourself:

Put a line with three backticks and cpp before the first line of your code.
Put a line with three backticks after the last line of your code:

Your code goes here.

On a standard US keyboard, the backtick is on the key at the top left, below the ESC key.


Sorry, my bad! Thank you!

(Pharap) #11

I’m disappointed, but not suprised.

You’re trying to store const char *s in an array of int, you can’t do that.
Data types exist for a good reason.

Also array indices start at 0, so swords[0] is the first item in the array and sword[6] is the last item

You need to do something like this:

const char * sword0 = "Rusty Shortsword";
const char * sword1 = "Iron Shortsword";
const char * sword2 = "Iron Longsword";
const char * sword3 = "Elvish Shortsword";
const char * sword4 = "Elvish Longsword";
const char * sword5 = "Enchanted Shortsword";
const char * sword6 = "Emerald Greatsword";

const char * swords[7]

But that’s going to eat into RAM quite significantly.

Ideally you should store your strings in progmem,
but printing arrays from progmem is a bit tricky.
You need to convert to a const __FlashStringHelper *.

Fortunately I made a helper function for this:

Have a look at this demo and read the comments:

Your final code will be something more like:

If there’s anything you don’t understand or want explained, ask away.


Okay, thank you. I will take a look at it.

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