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PT100 connection help

Posted by JohnLovaasen 
PT100 connection help
May 29, 2020 02:58PM
I'm trying to set up a higher temp hot end on my TAZ Pro. I have a PT100 + amplifier board from E3D but I can't find any analog pins on the Archim2 board to connect the signal line to. Any help is appreciated. Thanks.
Re: PT100 connection help
May 29, 2020 09:01PM
Take a look at [github.com]

The analog pin are all labeled AD {number}, all you need to do is find out where they go.

Such as the Thermistors AN1-AN4

Also note that if you power the PT100 Amplifier with 5v you will destroy the Archim2 IO pin which can only take 3.3v
Re: PT100 connection help
June 01, 2020 09:59AM
Thank you for the reply. I have taken a look at the schematic and it looks like AD0 is unused but I'm not sure how to hook up to it. I'm starting to think that a better option will be to use a different high temperature thermistor (high temperature thermistor from Slice Engineering) that is able to connect directly to the thermistor inputs. Any thoughts or suggestions?
Re: PT100 connection help
June 01, 2020 11:02AM
AD0 is free because its not connected to anything. to use that you would have to wire to the mpu pins!
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