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Update Readme #264

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Mar 6, 2018
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Update Readme #264

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9 changes: 5 additions & 4 deletions README.md
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Expand Up @@ -55,11 +55,12 @@ SPI:

### Power and voltage requirements

WS281X LEDs are generally driven at 5V, which requires that the data
signal be at the same level. Converting the output from a Raspberry
Pi GPIO/PWM to a higher voltage through a level shifter is required.
WS281X LEDs are generally driven at 5V. Depending on your actual
LED model and data line length you might be able to successfully drive
the data input with 3.3V. However in the general case you probably
want to use a level shifter to convert from the Raspberry Pi GPIO/PWM to 5V.

It is possible to run the LEDs from a 3.3V - 3.6V power source, and
It is also possible to run the LEDs from a 3.3V - 3.6V power source, and
connect the GPIO directly at a cost of brightness, but this isn't
recommended.

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