New Build - MCU 'mcu' shutdown: ADC out of range

General Discussion
1

Basic Information:

Printer Model: Mercury 1.1
MCU / Printerboard: BTT SKR MINI E3 V3.0
Host / SBC: BTT PI v1.2
klippy.log

Describe your issue: I am in the process of a new build. This area has me a bit stumped. I am receiving “MCU ‘mcu’ shutdown: ADC out of range”. When I look at the klippy.log I see where both the extruder and bed temps are negative values. I am not sure the best way to address this issue.

TIA,
Bob

klippy.log (113.2 KB)
printer.cfg (325 Bytes)
generic-bigtreetech-skr-mini-e3-v3.0.cfg (2.4 KB)

…

2

Check your thermistors and the pins they are connected to. Negative values generally mean that there is a wiring or thermistor specification error.

I’m not sure about the PT1000 connected to TH0 - that’s somewhere I think you should start.

3

If you are in the setup stages and don’t have the thermistors connected or debugging their connections, you can change the Min: -250 but after you get things working change these back to 0. The minimums are set at 0 to trigger that error if there is a reading failure.

4

Just as a personal preference - I keep a couple/three thermistors that have leads about six inches long with JST connectors around that I can plug in when setting up a new board, even if I am testing and not wiring into printer hardware.

The advantage of doing this is that you can check the operation of the hardware easily (ie give them a squeeze in your hand and the temperature goes up and can be seen).

5

Thanks, yes, I am in the setup stages. Interesting thought to allow continuation.

6

That is a good idea. Thanks

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7

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