Cheap way to add 1 Thermistor
-
Hi I want to add 1 extra Thermistor to my Duet 6HC as cheap as possible. Is there something like the PT100 Daughter Board for Thermistors? All my Temperature inputs on the 6HC and on the 3HC Expansion Board are already in use. I thought i saw someone with a Daughter Board for Thermistors a few days ago but I can’t find the site anymore.
-
undefined chris94 marked this topic as a question
-
@chris94 i'm afraid there isn't.
What temperature range do you want to measure?
It would be a daughter board or is the temp isn't super high then a DHT21 or DHT22 -
@jay_s_uk thanks for the quick answer. The range i want to measure is between 20 and 120°C (chamber Temperature).
-
@chris94 a DHT21/22 won't suffice then (max temp ~80 degrees).
Best to move one of your hotends or bed onto a PT100/PT1000 or K type thermocouple and free up a thermistor slot.
Or use a SammyC21 and connect a thermistor to that -
@jay_s_uk Changing the Hotends would be not very cheap because I’m using the slice copperhead with the HT sensor and it would be a really big pain in the butt to change them too. Same with the Keenovo bed heater. The Sammy-C21 is a bit to difficult for me to deal with. My last option was the extension board with a different sensor but I don’t really like them but it seems like my only option.
-
This might be a crazy idea. But there are a number of WiFi temp monitors for home brewing etc that have a high enough upper limit. Could you do that and report the chamber temps via a plugin like button commander to report it in dwc. Might be really hard to control from gcode but chamber temps you usually set at the start and don't adjust it. --but that not cheap I guess unless you alread make your own beer
-
This might be a silly Question but what the hell are you monitoring to require 7 thermistors already?
-
@dougal1957 said in Cheap way to add 1 Thermistor:
This might be a silly Question but what the hell are you monitoring to require 7 thermistors already?
Oooh, I could get that easily:
- electronics enclosure
- power supply enclosure
- heated bed temperature (sensor in the bed plate)
- bed mat temperature (sensor in the silicone mat)
- nozzle (times, say, four if you have a changer)
- enclosure heater element
- top middle and bottom of the enclosure to see if there's a gradient
- ambient outside the enclosure
that's ten on a machine with only one nozzle...
My enclosed Prusa has eight of those ten (the majority reporting direct to the octoprint on the Pi running it). My MB6HC delta has seven, because it only has one enclosure sensor, and doesn't have an ambient, but it does have two PSU sensors. Two of them are on PT100 daughter board.
Of course, whether they are actually useful / meaningful rather than just interesting is a different question.
-
@achrn said in Cheap way to add 1 Thermistor:
Of course, whether they are actually useful / meaningful rather than just interesting is a different question.
-
@achrn I suggest you use a DHT22 to monitor either the electronics enclosure, the PSU enclosure, or the ambient.
-
@dougal1957 I am currently using 3 Tools, 1 Bed heater and 3 separate chamber heaters (silicone mat). So, there are 7 and the one I want to add is for chamber monitoring.
How accurate are two silicone heater mats if I connect them together in series? Are there any problems with bigger temp overshoots or is this a usable solution?
@Nurgelrot I think that would be a bit overkill -
undefined chris94 has marked this topic as solved
