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Revision to Thermocouple daughter board

Tony

+[summary_image|420]
+[title|Thermocouple daughter board]
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+The Duet WiFi and Duet Ethernet both support up to two MAX31855-based daughter boards for supporting thermocouples. Each daughter board supports two K-type thermocouples.
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+[image|419|align=center]
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+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.
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+For setting up the Duet us use PT100 sensors see: [[Connecting thermocouples]]