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+= Blinkenwall v2 =
+Concept: No glass bricks any more, instead something mounted on the wall. This simplifies a lot of things and also allows a higher resolution.
+== HUB75 ==
+One idea: Using the HUB75 panels available for cheap from China.
+The goal is to have a resolution roughly equivalent to the original Gameboy (160x144). Note that it had an aspect ratio very close to square, which is not feasible on the wall. Thus, the goal is to have at least 160 pixels horizontally, and whatever is suitable vertically (96?).
+HUB75 panels are classified by their pixel distance. The distance chosen for this calculation is P10, which means 10mm distance (in both dimensions). This is the lowest density available for indoor panels.
+The old Blinkenwall has a size of 1900x1000mm. Horizontally, maybe 100mm could be added, vertically there's a lot of variation possible. HUB75 panels usually have a resolution of 32x16, thus 320x160mm.
+The chosen panel layout is 6x7, which means 6*320mm = 1920mm horizontally and 7*160mm = 1120mm. This fits very well into the size constraints. The resulting resolution is 192x112, which is very close to the target of 160x144. The aspect ratio is close to 16:9, which would be 192x108.
+The price for the panels alone would be below €500 [http://www.aliexpress.com/item/p10-smd-indoor-rgb-led-panel-hub-75-1-8-scan-320-160mm-32-16-pixel/1000001339655.html here] (asking for a bulk discount would be required). Also note that we should order spare panels in case some of them break, so a total of 45 panels is recommended (maybe 50 panels would be cheaper than that, though?).
+The product description does not give any information on power consumption, but based on similar products on AliExpress, it should be around 540W average with 1400W maximum (all pixels bright white). Note that this can be reduced by using a black background for animations (which is done right now as well).
+=== Mounting ===
+The panels have mounting holes in the back, constructing a frame for them is trivial. Cooling is a bit of a concern, since a lot of power is dissipated. A diffusing pane (polycarbonate?) should be mounted in front of the panels so the pixels become larger. Multiple 5V power supplies could be used for powering the whole system. Unlike the current solution, it should be able to turn it off!
+=== Controller ===
+This is where the real challenge comes in. These panels do not have a controller built in, your have to PWM the rows and columns yourself. The connection is called HUB75, although this is not an official standard per se. There are plenty of explanations available on the web, and it's not very complicated. However, if you want to have more than the primary colors, you can't use an Arduino for it, since it's not fast enough (colors have to be centrally PWMed). You have to send a steady ~7MHz signal, which usually can only be produced by FPGAs.
 == Various Links ==