1 MHz SPI max speed for latest pixels
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@ -100,13 +100,7 @@ void setup()
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SPI.begin();
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SPI.setBitOrder(MSBFIRST);
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SPI.setDataMode(SPI_MODE0);
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SPI.setClockDivider(SPI_CLOCK_DIV8); // 2 MHz
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// WS2801 datasheet recommends max SPI clock of 2 MHz, and 50 Ohm
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// resistors on SPI lines for impedance matching. In practice and
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// at short distances, 2 MHz seemed to work reliably enough without
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// resistors, and 4 MHz was possible with a 220 Ohm resistor on the
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// SPI clock line only. Your mileage may vary. Experiment!
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// SPI.setClockDivider(SPI_CLOCK_DIV4); // 4 MHz
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SPI.setClockDivider(SPI_CLOCK_DIV16); // 1 MHz max, else flicker
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// Issue test pattern to LEDs on startup. This helps verify that
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// wiring between the Arduino and LEDs is correct. Not knowing the
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