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Earlier this year I happened to be in Singapore in transit, and took the opportunity to visit Sim Lim Tower - a high-rise mall full of electronic components shops! Amazing place, and amongst other things (including super-cheap kits for the kids to build!) I picked up three 5x7 LED matrix panels for a dollar each (!!). They didn't have any part numbers that I could see, but after experimentation they turned out to be row-anode devices and once I figured out the pinout I decided to build a project out of them. As any of us who have children know, it's a daily battle to get kids to brush thei