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Revision to Using external stepper motor drivers

Tony

There are a few reasons for using external stepper motor drivers:
 
* You may want to use the expansion header to drive more extruders, but not want to use a [[Duex2 and Duex5 Features|Duex2Features|Duex 2 or Duex5Duex 5 expansion board]] with the Duet 2 (Wifi or Ethernet) or the [http://reprap.org/wiki/Duex4|Duex4http://reprap.org/wiki/Duex4|Duex 4] with older generation Duets;
* You may want to use the expansion header to drive more extruders, but not want to use a [[Duex2 and Duex5 Features|Duex2Features|Duex 2 or Duex5Duex 5 expansion board]] with the Duet 2 (Wifi or Ethernet) or the [http://reprap.org/wiki/Duex4|Duex4http://reprap.org/wiki/Duex4|Duex 4] with older generation Duets;
* You may want to drive larger stepper motors than the internal stepper drivers are rated for (currently 2.4A on the generation 2 Duets, and 2.0A on the generation 1 Duets);
* You may need 11 or 12 stepper drivers, which is two more than is supported by a generationDuet 2 Duet + Duex5Duex 5.
* You may need 11 or 12 stepper drivers, which is two more than is supported by a generationDuet 2 Duet + Duex5Duex 5.
 
The expansion header has support for 5 external drivers on the Duet 2 and 4 on Duet0.8.5 or Duet0.62. The pinouts for the expansion header are important to make a note of when connecting external drivers:
The expansion header has support for 5 external drivers on the Duet 2 and 4 on Duet0.8.5 or Duet0.62. The pinouts for the expansion header are important to make a note of when connecting external drivers:
 
The generation 2 Duets also support two additional drivers connected to the CONN_LCD connector.
=== External Extruders Example ===
 
This example shows how to add one external stepper driver to drive a third extruder on a DuetWifiDuet 2 Wifi.
This example shows how to add one external stepper driver to drive a third extruder on a DuetWifiDuet 2 Wifi.
 
At the DuetWifiDuet 2 Wifi end the pins needed to connect to are highlighted in this image:
At the DuetWifiDuet 2 Wifi end the pins needed to connect to are highlighted in this image:
 
[image|409|align=center]

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