PT100 - PT1000 Setup - Revision history

Poofjunior: /* RepRapFirmware 3.x */ removing r parameter since it uses the board default if unspecified

2021-06-13T17:48:59Z

RepRapFirmware 3.x: removing r parameter since it uses the board default if unspecified

2020-12-28T16:52:23Z

Typo corrected

2020-12-28T16:49:07Z

Typo corrected

2020-06-24T05:17:48Z

A note on wiring issues and behavior

2020-06-23T18:43:43Z

2020-06-23T14:37:53Z

2020-06-23T14:34:11Z

How to determine wiring issues

2020-06-23T14:30:07Z

RepRapFirmware 3.x

2020-06-23T14:29:48Z

PT1000 Setup

2020-06-23T14:28:25Z

@@ Line 44: / Line 44: @@
   ; Heaters
-  M308 S0 P"temp0" Y"pt1000" R2200              ; configure sensor 0 as PT1000 on pin temp0
+  M308 S0 P"temp0" Y"pt1000"                    ; configure sensor 0 as PT1000 on pin temp0
   M950 H0 C"out0" T0                            ; create bed heater output on out0 and map it to sensor 0
   M143 H0 S120                                  ; set temperature limit for heater 0 to 120C
   M307 H0 B0 S1.00                              ; disable bang-bang mode for the bed heater and set PWM limit
   M140 H0                                       ; map heated bed to heater 0
-  M308 S1 P"temp1" Y"pt1000" R2200              ; configure sensor 1 as PT1000 on pin temp1
+  M308 S1 P"temp1" Y"pt1000"                    ; configure sensor 1 as PT1000 on pin temp1
   M950 H1 C"out1" T1                            ; create nozzle heater output on out1 and map it to sensor 1
   M143 H1 S280                                  ; set temperature limit for heater 1 to 280C

@@ Line 30: / Line 30: @@
 The following is a sample working setup using 2 PT100's on a Duet Wifi board running RRF2.0.5.
-Always note your maximum temperature limits, your channel mapping to RDTs and heaters, and your pin names.
+Always note your maximum temperature limits, your channel mapping to RTDs and heaters, and your pin names.
   ; Heaters

@@ Line 16: / Line 16: @@
 The following is a sample working setup using 2 PT100's on a Duet Wifi board running RRF3.1.1.
-Always note your maximum temperature limits, your channel mapping to RDTs and heaters, and your pin names.
+Always note your maximum temperature limits, your channel mapping to RTDs and heaters, and your pin names.
   ; Heaters

@@ Line 8: / Line 8: @@
 RTD's (aka PT100/PT1000) are '''positive''' resistance temperature devices meaning that their resistance '''increases with higher temperature readings''', which is the exact opposite behavior of a what typical 3D printer NTC thermistor would do! This means that if you read a high resistance value on your thermistor channel/wires, you are interpreting a reading for a high temperature, and a low temperature would read as a short or low resistance measured across the thermistor.
-Also note that the Duet Meastro and Duet 3HC boards have thermistor inputs with a 2.2k ohm sense resistor, which means they are optimised to function with PT1000's much better than a Duet WiFi/Ethernet board (which have 4.7k ohm sense resistors on board).
+Also note that the Duet Meastro and Duet 3HC boards have thermistor inputs with a 2.2k ohm sense resistor, which means they are optimised to function with PT1000's much better than a Duet WiFi/Ethernet board (which have 4.7k ohm sense resistors on board). This value if not specified in the M308 lines will be automatically selected by the FW For the board in use. It is only listed for completeness.
 == PT100 Setup ==

← Older revision		Revision as of 18:43, 23 June 2020
Line 58:		Line 58:

	=== RepRapFirmware 2.x and 1.x ===		=== RepRapFirmware 2.x and 1.x ===
−	''(TBA)''	+	''(TBA)'
		+
		+	=== Further precautions ===
		+
		+	DO NOT FORGET TO PID TUNE THE SYSTEM EVERY TIME YOU MAKE A CHANGE TO IT

@@ Line 3: / Line 3: @@
 For a good comparison of the virtues of the common Temperature Sensors see [https://duet3d.dozuki.com/Wiki/Temperature_sensors the Duet Wiki page on Temperature_sensors].
 For additional information, please refer to [https://duet3d.dozuki.com/Wiki/Connecting_thermistors_or_PT1000_temperature_sensors the Duet3D wiki page for setting up RTDs].
 == PT100 Setup ==
@@ Line 53: / Line 59: @@
 === RepRapFirmware 2.x and 1.x ===
 ''(TBA)''

@@ Line 56: / Line 56: @@
 == How to determine wiring issues ==
-RTD's (aka PT100/PT1000) are Positive Resistance Temperature devices meaning that their resistance increases with Temperature (opposite of a NTC Thermistor)
+RTD's (aka PT100/PT1000) are '''positive''' resistance temperature devices meaning that their resistance '''increases with higher temperature readings''', which is the exact opposite behavior of a what typical 3D printer NTC thermistor would do! This means that if you read a high resistance value on your thermistor channel/wires, you are interpreting a reading for a high temperature, and a low temperature would read as a short or low resistance measured across the thermistor.
-Also note that the Meastro and Duet3 have the Thermistor inputs optimised to cope with PT1000's much better than a Duet WiFi/Ethernet due to them using a 2.2K sense resistor instead of the 4.7K one (all future boards are likely to have the 2.2 one by default)
+Also note that the Duet Meastro and Duet 3HC boards have thermistor inputs with a 2.2k ohm sense resistor, which means they are optimised to function with PT1000's much better than a Duet WiFi/Ethernet board (which have 4.7k ohm sense resistors on board).

← Older revision		Revision as of 14:30, 23 June 2020
Line 49:		Line 49:


−	You may want to adjust the M143 line for your own usage case and the same will go for the ~~I/P O/P Pins~~.	+	You may want to adjust the M143 line for your own usage case and the same will go for the input and output pins.

	=== RepRapFirmware 2.x and 1.x ===		=== RepRapFirmware 2.x and 1.x ===

@@ Line 34: / Line 34: @@
 PT1000 sensors can be directly plugged into a Duet controller board without any additional hardware or electronics.
 This is a working setup for 2 PT1000 sensors connected to the first 2 Thermistor inputs on a Duet3 running RRF3.1.1
@@ Line 49: / Line 50: @@
 You may want to adjust the M143 line for your own usage case and the same will go for the I/P O/P Pins.
 == How to determine wiring issues ==

@@ Line 7: / Line 7: @@
 To be able to use PT100 sensors on a Duet controller board, you will need to also install a [https://www.duet3d.com/DuetAddons/PT100_DaughterBoard PT100 daughter board] to be able to accurately measure the signal from the RTD for the Duet controller.
-Follows is a working setup using 2 PT100's on a Duet Wifi board running RRF3.1.1
+=== RepRapFirmware 3.x ===
   ; Heaters
   M143 S300 ; Set maximum heater temperature to 300C
   M308 S0 P"spi.cs2" Y"rtd-max31865" F50
   M308 S1 P"spi.cs1" Y"rtd-max31865" F50
@@ Line 20: / Line 21: @@
-The commented out M305's are for FW V2.x.x where the hotend is connected to the first port on the Daughter board if you want to contact a PT100 in the same order as normal then set P0 to X200 and P1 to X201.
+=== RepRapFirmware 2.x and 1.x ===
 == PT1000 Setup ==