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Revision to Neopixel and DotStar LEDs

Ian A-S

-Duet 3 MB6HC supports both DotStar and NeoPixel LED strips. Duet 3 Mini supports NeoPixel only. Duet 2 and Duet Maestro do not support these LED strips directly, but you can use an Arduino to interface them to a Duet.
+Duet 3 MB6HC supports both DotStar and NeoPixel LED strips. Duet 3 Mini supports NeoPixel only. Duet 2 WiFi and Ethernet supports NeoPixel from RRF 3.3. You can also use an Arduino to interface LED strips to a Duet.
== Connecting DotStar or NeoPixel strips to Duet 3 MB6HC ==
In firmware versions prior to 3.3 the maximum supported number of Neopixel LEDs in a strip is 60 RGB LEDs. Firmware 3.3 supports up to 80 RGBW LEDs or 106 RGB LEDs. The firmware limit for DotStar LEDs is several thousand.
-'''Caution!''' LED strips can draw a considerable amount of power, usually up to 60mA per LED (for RGBW Neopixel LEDs, up to 80mA per LED). If you are powering the LED strip from the Duet, make sure that the Duet is able to supply sufficient current (maximum 3A total external load on +5V). In particular, if you are powering a Raspberry Pi or other single board computer from the Duet, then the Duet will not be able to power a LED strip as well.
+***Caution!*** LED strips can draw a considerable amount of power, usually up to 60mA per LED (for RGBW Neopixel LEDs, up to 80mA per LED). If you are powering the LED strip from the Duet, make sure that the Duet is able to supply sufficient current (maximum 3A total external load on +5V). In particular, if you are powering a Raspberry Pi or other single board computer from the Duet, then the Duet will not be able to power a LED strip as well.
== Connecting NeoPixel strips to Duet 3 Mini ==
== Connecting NeoPixel strips to Duet 2 Wifi or Ethernet ==
+Support for NeoPixel strips on Duet 2 WiFi/Ethernet was added in RRF 3.3.
+
A signal for controlling Neopixel strips can be output on pin 5 of the CONN_LCD connector provided that you do not have external stepper drivers connected to CONN_LCD. The signal level is 3.3V so you need to level shift it to 5V. A non-inverting 74HCT series gate or buffer such as 74HCT08 can be used to do this.

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