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Revision to PT100 temperature sensor daughter board

Tony

[title|PT100 temperature sensor daughter board]
 
[toc]
 
 
The
== Overview of temperature daughter boards ==

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 both support up to two MAX31865-basedtemperature daughter boards. Eachboards 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 boardboards can be mixed and matched.

[image|1024|size=large|align=center]

The Duet 2 Maestro
supports 1 temperature daughter board for two PT100SPI temperature sensors:input channels. On the Maestro either a Thermocouple or PT100 daughter board can be connected, but not both.

== PT100 sensor support ==

The PT100 daughter board uses the Maxim Integrated MAX31865 RTD sensor IC. This IC supports 2,3 or 4 wire PT100 connections. The mode can be set using jumps on the board. With the jumpers on/bridged the board expects a 2 wire PT100 sensor. With the jumpers off/cut a 4 wire PT100 sensor can be used. The change between older versions and 1.1 was to move from solder jumpers to pin jumpers.

=== v1.1 ===

From version 1.1 on wards there are two pin jumpers per input channel.
The
== Overview of temperature daughter boards ==

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 both support up to two MAX31865-basedtemperature daughter boards. Eachboards 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 boardboards can be mixed and matched.

[image|1024|size=large|align=center]

The Duet 2 Maestro
supports 1 temperature daughter board for two PT100SPI temperature sensors:input channels. On the Maestro either a Thermocouple or PT100 daughter board can be connected, but not both.

== PT100 sensor support ==

The PT100 daughter board uses the Maxim Integrated MAX31865 RTD sensor IC. This IC supports 2,3 or 4 wire PT100 connections. The mode can be set using jumps on the board. With the jumpers on/bridged the board expects a 2 wire PT100 sensor. With the jumpers off/cut a 4 wire PT100 sensor can be used. The change between older versions and 1.1 was to move from solder jumpers to pin jumpers.

=== v1.1 ===

From version 1.1 on wards there are two pin jumpers per input channel.
 
[image|417|align=center]
 
Versions of the board before v1.1 had solder jumpers to convert from 2 wire to 4 wire. From version 1.1 on wards there are two jumpers per input channel. With the jumpers on the board expects a 2 wire PT100 sensor. With the jumpers off a 4 wire PT100 sensor can be used.=== Older versions ===
Versions of the board before v1.1 had solder jumpers to convert from 2 wire to 4 wire. From version 1.1 on wards there are two jumpers per input channel. With the jumpers on the board expects a 2 wire PT100 sensor. With the jumpers off a 4 wire PT100 sensor can be used.=== Older versions ===
 
A totalVersions of two temperature sensor daughter boards (PT100 or Thermocouple) are supported on the DuetWifi, with a furtherboard before v1.1 had solder jumpers to convert from 2 on the Duex2 or Duex5 bringing the total number of digital temperature inputswire to 8.4 wire.

[image|418|align=center]

== Configuration ==
A totalVersions of two temperature sensor daughter boards (PT100 or Thermocouple) are supported on the DuetWifi, with a furtherboard before v1.1 had solder jumpers to convert from 2 on the Duex2 or Duex5 bringing the total number of digital temperature inputswire to 8.4 wire.

[image|418|align=center]

== Configuration ==
 
For setting up the Duet us use PT100 sensors see: [[Connecting PT100 temperature sensors]]
 
== MAX31865 sensor IC details ==
 
An external resistor sets the sensitivity for the RTD being used (in the case of the Duet3d daughter board this is a PT100) and a precision delta-sigma ADC converts the ratio of the RTD resistance to the reference resistance into digital form. High Accuracy: 15-Bit ADC Resolution; Nominal Temperature Resolution 0.03125°C (Varies Due to RTD Nonlinearity). Total Accuracy Over All Operating Conditions: 0.5°C (0.05% of Full Scale) max. For more information see the [https://www.maximintegrated.com/en/products/sensors/MAX31865.html|Maxim Integrated MAX31865 product page].
 
== Other Temperature sensors ==
 
The Duet 2 Wifi, Ethernet and Maestro support various other temperature sensors.
 
See:
 
* [[Temperature_sensors|A comparison of temperature sensors]]
* [[Thermocouple daughter board]]
* [[Connecting thermistors or PT1000 temperature sensors]]

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