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Revision to Hardware Overview


== Hardware difference between Duet 2 and Duet 0.8.5 ==
The Duet WiFi and Duet Ethernet provide the following hardware improvements over the Duet 0.8.5:
* 120MHz ARM Cortex M4 processor (ATSAM4E8E) with 128Kb RAM and hardware floating point unit, instead of 84MHz M3 (ATSAM3X8E) with 96Kb RAM as on the Duet 0.8.5
* On the Duet WiFi only, WiFi connection instead of wired Ethernet, supporting typically 1Mbyte/sec file upload speed with a good wireless network connection and suitable SD card
* TMC2660 stepper drivers instead of A4982. These drivers support higher motor current and up to 256x microstepping, with optional 16x interpolation from 16x to x256.
* Variable microstepping
* The maximum recommended supply voltage, [[Glossary_of_Terms#VIN|VIN]] , is 25V (reduced from 30V) due to the new driver chips
*Auto ADC calibration
* Three controllable fans instead of two
* Fans can be powered from [[Glossary_of_Terms#VIN|VIN]] , from +5V, or using external power supplied through the centre pin of the [[Glossary_of_Terms#VIN|VIN]] /5V selector block
* Higher bed heater circuit current rating (18A)
* Support for thermocouple and RTD daughter boards
* Connector for a second Z motor
* Supply voltage monitoring, facilitating print resume-after-power-fail function
* Larger terminal blocks for the extruder heater outputs, to make wiring easier
* Diagnostic LED
* Support for up to five additional heaters and stepper drivers on the expansion bus, instead of four, plus another two additional external stepper drivers to give a total of 12 stepper drivers maximum
* Other design changes to increase board resilience, improve safety, and reduce EMI
== Hardware limitations ==

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