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Adafruit 24-Channel 12-bit PWM LED Driver - SPI Interface [TLC5947] : ID 1429 : $14.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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HT16K33 RAM Mapping 16x8 LED Controller Driver Module I2C 16 Segment 8 Common LED Dot Matrix Module with Keyscan for Arduino : Amazon.ca: Industrial & Scientific
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