- Thu Apr 18, 2019 12:13 pm
It's an interesting thought, but a few notes:
- I seem to have understood you're connecting a relay to the ledpixel. I wouldn't do that, if only for the amount of current it draws and the backcurrent from the coil when released. I also happen to dislike relays anyway
- from my own experience: max span between two ledpixel is about 3 meters. You can stretch that to many more meters (I haven't met the limit yet) by making the ledpixel control a mosfet gate driver. The mosfet gate driver has a schmitt trigger on it's input, to prevent noise being transferred and it drives the output very hard to gnd or Vcc, which is exactly what you want, to overcome the capacitance of the cabling, at these frequencies.
- I think using a ledpixel for PWM has somewhat limited use for PWM because the refresh is good, but the width is very limited (8 bits), too small for me. When I want an arbitrary amount of inputs or outputs, I just use I2C I/O expanders. Especially those from Microchip are very handy and only cost a few bucks for five pieces.