ketrab2004-arduino/stars_screensaver

test to see how quickly i can draw and hide single pixel stars that move around

Stars Screensaver

Parts:

• Arduino MEGA 2560
• A 2.8'' TFT LCD shield w/Cap Touch and microSD (anything that works with ILI9341 should work)

Setup:

1. Attach the TFT to the top of the arduino
2. Change your settings in settings.h
   • DEBUG: if you would like to compile debug Serial.prints
   • TFT_CS, TFT_DC & TFT_BL: if you use different ports for your lcd
   • TFT_BRIGHTNESS: 0-255 for the backlight strength
   • STAR_COUNT: if you would like more or less stars (32 stars gives a nice 52-58fps on my Arduino MEGA 2560)
   • STAR_MIN_SPEED & STAR_MAX_SPEED: for changing the speed of the stars in pixels per second (stars at the center travel at MIN speed and stars near the edge of the screen will travel at MAX speed)
   • SHOW_FPS: if you would like to see the fps count
   • FPS_UPDATE_INTERVAL: how many milliseconds should pass between updating the fps counter (to improve performance)
   • SHOW_MINMAX_FPS: if you would like to clearly see the min and max fps got (only takes effect if SHOW_FPS is 1)
3. Upload the sketch
4. See the stars fly by
5. (don't keep it running for too long, since my Arduino starts to get warm)

stars_screensaver's Issues

Stuck stars

Sometimes stars get stuck on the screen

They aren't actually stuck because if i add this

if (pos == nextPos) {
    debugVar("pos: ", pos);
}

into Star::doStep() nothing actually prints.

It must be a star that doesn't get properly undrawn somehow...

(also if another star goes to the same position, it does get undrawn properly)