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Semus

UMO+ what type of thermistor (for firmware)?

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Hey guys,

I upgraded my UMO+ with the UM2 upgrade kit, so I have my old UMO+ hotend lying around doing nothing.

I'm going to be modding my new CR-10 to use the UMO+ hotend, but I need to know what type of thermistor the UMO+ uses so that I can change the thermistor type in the firmware.

Does anyone know which type of thermistor the UMO+ uses?

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It is not a thermistor, it is PT100 RTD. In Marlin it is:

// 20 is the PT100 circuit found in the Ultimainboard V2.x

Be aware that you can't connect it directly to your board, you need an additional circuit (like the E3D PT100 amplifier)

Thanks for the info. Looks like I might just replace the PT100 with a normal thermistor, just to make things a little easier.

The documentation on the E3D PT100 amplifier is great, but it appears to be out of my scope for electronics, unfortunately.

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Installing the E3D amplifier is relatively straightforward, but I tend to agree with you, the easiest is to keep a thermistor if this is what you have on this printer. You can always upgrade afterwards if yo want a more precise temperature control.

Agreed. I'm sure it's probably a fairly simple process, but I have a couple of normal thermistors lying around here, so it's probably best I use those for the time being.

I'd love to learn more about the E3D amplifier and PT100, though. I started reading the wiki for the amplifier, but they use a RAMPS board as an example, and the CR-10 doesn't use a RAMPS board. They may be similar, but I'll have to do a bit more research before I attempt to use the PT100.

Really great info, though. I appreciate it ;-)

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