Dear fellows Let me ask you please about using the level shifter based on 74HCT08. It is related for the scenario when WS2812b is connected via a level shifter because a data pin of the LED required 5V meanwhile GPIO of RPi gives 3.3V only... https://hyperion-project.org/wiki/Supported-hardware WS281X-PWM: Used to directly connect WS2812b It works for me, perfectly. I just want to understand why we need to cascade two ports. For me it looks like one port is enough for the job. Any hint would be much appreciated.
Correct - you only need one pair of hct08 as your ws2812 only us a single signal. Ws2801 by contrast is spi attached and needs data and clock.
Just a feedback from my side: maybe we'd better correct the description on this wiki page to reflect this idea? Therefore, we decided to insert a line buffer between the GPIO and the led string based on a simple 74HCT series IC (using cascaded NAND (74HCT00), OR (74HCT32), or AND (74HCT08) ports) I would put in in a way: Therefore, we decided to insert a line buffer between the GPIO and the led string based on a simple 74HCT series IC (using NAND (74HCT00), OR (74HCT32), or two cascaded AND (74HCT08) ports) ... Our board relies on NAND version of 74HCT so two cascaded ports are used...
