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Revision to Thermocouple daughter board

Tony

[title|Thermocouple daughter board]
+[toc]
-The Duet WiFi and Duet Ethernet support up to two daughterboards stacked (with a further two stacked on the Duex2 or 5):
-'''Version 1.1 thermocouple boards''': MAX31856-based daughter boards each supporting two thermocouples of type B, E,J K, N, R, S or T.
+== Overview of temperature daughter boards ==
-'''Older versions''': MAX31855-based daughter boards, each supporting two K-type thermocouples
+The Duet 2 3d printer controllers support one or more temperature daughter boards which provide expanded temperature sensor connectivity using Maximum integrated ICs. These daughter boards connect to the Duet digitally over SPI.
+
+=== Number of temperature daughter boards supported ===
+
+The Duet 2 WiFi and Duet 2 Ethernet support up to two temperature daughter boards stacked, with a further two stacked on the Duex2 or 5. This provides a total of 8 digital temperature inputs to 8 . PT100 or Thermocouple daughter boards can be mixed and matched.
+
+[image|1024|size=large|align=center]
+
+The Duet 2 Maestro supports 1 temperature daughter board for two SPI temperature input channels. On the Maestro either a Thermocouple or PT100 daughter board can be connected, but not both.
+
+== Thermocouple Support ==
+
+There have been two versions of the thermocouple board. the change from version 1.0 to 1.1 was to made to move to the MAX31856 sensor IC.
+
+=== Version 1.1 thermocouple boards ===
+
+* MAX31856-based daughter boards each supporting two thermocouples of type B, E,J K, N, R, S or T.
[image|419|align=center]
-A total of two temperature sensor daughter boards (PT100 or Thermocouple) are supported on the DuetWifi, with a further 2 on the Duex2 or Duex5 bringing the total number of digital temperature inputs to 8.
+=== Older versions ===
-For setting up the Duet us use PT100 sensors see: [[Connecting thermocouples]]
+* MAX31855-based daughter boards, each supporting two K-type thermocouples
+
+== Configuration ==
+
+For setting up the Duet 2 to use thermocouple sensors see: [[Connecting thermocouples]]
+
+== MAX31856 sensor IC details ==
+
+The MAX31856 performs cold-junction compensation and digitizes the signal from any type of thermocouple. The output data is formatted in degrees Celsius. This converter resolves temperatures to 0.0078125°C, allows readings as high as +1800°C and as low as -210°C (depending on thermocouple type), and exhibits thermocouple voltage measurement accuracy of ±0.15%. See the [https://www.maximintegrated.com/en/products/sensors/MAX31856.html|Maxim integrated website for more details on the MAX31856].
+
+== Other Temperature sensors ==
+
+The Duet 2 Wifi, Ethernet and Maestro support various other temperature sensors.
+
+See:
+
+* [[Temperature_sensors|A comparison of temperature sensors]]
+* [[PT100 temperature sensor daughter board]]
+* [[Connecting thermistors or PT1000 temperature sensors]]

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