RosscoS wrote:This leads me to think that inductive noise is causing both the erratic readings & lower readings.
john444 wrote:If isolating the temp sensing circuit is not working then my suggestion is to connect the breakout GND to the mechanical ground of the espresso. Do not ground the thermocouple wires. If your thermocouple has a shield then also connect it to the GND on the breakout but not the thermocouple tip. Electrically isolate the thermocouple wires from the espresso's mechanical ground (green wire) as well as the neutral (white) and especially the hot (black) wire.
How are you powering the temp senser?
So let me see if I am understanding this correctly, connect the GND of the MAX6675 breakout board to the GND (chassis?) of the espresso machine?
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