Thermistor at 2000c

Phaedrux

Well we need to verify what sensor you are actually using. Is it a thermistor or PT100. If it's a PT100 you will need the daughter board before you can use it.

Bewaren

@Phaedrux

This is the thermistors or PT100 I am using, not sure if it helps identify it

Phaedrux

I believe the E3D PT100s use red wires and the thermistors are blue. But I'm not sure if that's a hard rule, but I think that's generally the case.

https://e3d-online.com/collections/printer-parts-electrical/products/thermistor-cartridge
https://e3d-online.com/collections/printer-parts-electrical/products/pt100-temperature-sensor

You should try to verify with your invoice or email confirmation from your purchase to be sure.

You'll need a daughter board to be able to read the PT100.
https://duet3d.dozuki.com/Wiki/Connecting_PT100_temperature_sensors

https://e3d-online.com/products/pt100-daughterboard-for-duet-wifi?_pos=4&_sid=8859bba4b&_ss=r

Bewaren

Alright I can confirm it's a PT100, found the invoice. I will get one ordered asap.

Phaedrux

Glad we got that sorted out. Once you have the daughterboard installed and connected you'll need to make a change to your temp sensor config to point to the PT100.

M308 S1 P"spi.cs1" Y"rtd-max31865"             ; configure sensor 1 as thermocouple via CS pin spi.cs1
M950 H1 C"e0heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00                               ; disable bang-bang mode for heater  and set PWM limit

A Former User

You should try to verify with your invoice or email confirmation from your purchase to be sure.

suppose its still possible they could have shipped the wrong one, to be sure use a multimeter and measure the resistance at room temperature; PT100 should be about 100 ohm, and PT1000 should be about 1000 ohm.

(Techincally PT100 is 100 ohm at 0°C and closer to 110 at room temperature, and 1100 ohm for PT1000)

Bewaren

@bearer comes back at 109 ohm

sg2020

@phaedrux I was also trying to get my E3D PT100 sensor to work and your code helped. Could you explain why this works? Why does it need p"spi.cs1"? why is it configuring the sensor 1 as a thermocouple?

Phaedrux

@sg2020 said in Thermistor at 2000c:

@phaedrux I was also trying to get my E3D PT100 sensor to work and your code helped. Could you explain why this works? Why does it need p"spi.cs1"? why is it configuring the sensor 1 as a thermocouple?

Ignore the comment on that line. It's not actually a thermocouple, that's just the comment that the config tool has added. It seems to be the same regardless of what type of daughterboard you've chosen.

The important thing is that you're telling it what pin you're using (spi.cs1) and what type of daughterboard chip you're using (rtd-max31865).

tony449777

@phaedrux So if the channel 1 on the card is “spi.cs1”
And you have one daughter board with the two ports, then is the second port for the same card “spi.cs2”?

Is there any pages that you can recommend that would help me understand what this means?

Phaedrux

@tony449777 said in Thermistor at 2000c:

Is there any pages that you can recommend that would help me understand what this means?

https://duet3d.dozuki.com/Wiki/Temperature_sensors
https://duet3d.dozuki.com/Wiki/Connecting_PT100_temperature_sensors
https://duet3d.dozuki.com/Wiki/PT100_temperature_sensor_daughter_board