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APA102 and WS2811
APA102 led and WS2811lRGB all are chip-built-in SMD5050 and 6 feet. APA102 chip base on standard two line (DAT,CLK) SPI protocol.

it like external LPD8806 IC. Each led have two signal input and Two signal output. it is more suitable to work with microcontroller.
But it request a high technology to make prototype. we here make a relative experience, led transfer data with 4MHZ SPI clock without any hitch. It appears that the maximum speed is mainly limited by the parasitics of the wiring.

WS2811 base on signal line (DAT) SPI protocol,also are popular recent from 2013 year. Many player have more testing and projects, its advantage" Easy to control, cheap price", it versus APA102, its transfer speed will be slower.
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