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rpi-rgb-led-matrix
Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO
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I help maintain the MLB LED scoreboard project and we don't recommend anything less than 5A for a single matrix, and you're running 6 of them. In fact, the tutorial you linked suggests that you are way underpowering your matrices: https://learn.adafruit.com/32x16-32x32-rgb-led-matrix/powering
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