What are you doing with your Beta Shield?

[defragster]

@netguy204 compiled AND WORKS ... with this edit to BAM.cpp line~14

//prog_
const uint8_t CIEL8[] PROGMEM = {

[defragster]

@netguy204  :: AWESOME BAM shading work - interesting functional intuitive UI!

I edited BetaSketcher code at line 71 as follows to allow a PIXEL clear, and to protect the image from a shadow (or flash):

  if(!digitalRead(BUTTON)) {
    if (7 == screen[peny][penx])
      screen[peny][penx] = 0;  // Reset BRIGHT pixel to off
    else
      screen[peny][penx] = min(7, screen[peny][penx] + 1);
  }
 
  // clear the screen on significant light change if joystick DOWN
  if(abs(light_neutral - analogRead(LIGHT)) > light_neutral / 2 && (dy < LIVEZONE)) {
    memset(screen, 0, sizeof(screen));
  }

[netguy204]

Not sure why you needed the PROGMEM edit (worked fine for me and I'm pretty sure there's nothing special about my configuration). But, pulled in that change for compatibility.

I want to think more about how to clear pixels. I like being able to hold down the joystick button as I sweep back and forth until the line is full bright. I tend to reintroduce dead pixels after this change.

I made the light sensor respond only to darkening. I was having the "rotating the board towards light clears my art" problem too. Things feel pretty good after this change.

[defragster]

I saw the sweep was affected - which is the joy of an etchasketch - I was started to code a check on change of x,y before and after the penXY updates.  So the 0 dim only happens when the joy is standing. 

This is better but still goes off on ends and uplifting pixel:
  int movexy=penx+(10*peny);
...
  if(!digitalRead(BUTTON)) {
    if (7 == screen[peny][penx] && (penx+(10*peny)==  movexy))