Extremely noisy Thermistor readings

Hi guys,

I recently Klipperized a Sapphire SP3, didn’t change anything except that I installed a BLTouch.

I’m getting extremely noisy readings from all temperature sensors, even the one in the MCU.

What could be causing this?

This can be caused by EMI, a noisy PSU and/or bad grounding.

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Thanks!

It seems to be a noisy PSU. I’ve enabled USB power, and as long as the PSU is turned off there is no noise on the readings.

Is there any fix for this, or do I need to buy a better PSU to get rid of this?

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You may get rid of the noise by adding additional capacitors to the output lines of the PSU.

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