Arduino LED Matrix Control Part II
With the Arduino app you can control a led matrix over wifi on your iphone.
Later you can save your “icon” and load older ones.
Sourcecode is still a bit clunky. But it Works 
- (void)drawRect:(CGRect)rect { CGContextRef context = UIGraphicsGetCurrentContext(); if(isOn) { [color setFill]; } else { [[UIColor grayColor] setFill]; } CGContextSetLineWidth(context, 1.0); CGContextAddEllipseInRect(context, rect); CGContextDrawPath(context, kCGPathFillStroke); }
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Great creative use for a WiShield in combination with the iPhone!
Be creative and you will stay young!
-John