Running a marlin1.1.9 / ramps printer.
No problems for months, suddenly today when I turn on, the extruder temp reads as :
T:-15.00 /0.00 B:-15.00 /0.00 @:0 B@:0
I have thoroughly tested the electronics and run my own firmware to validate the voltage seen by the adc.
All is good, no hardware problems at all. All voltages and adc readings correct.
So why does Marlin no longer read the adc?
I've run no commands, changed no params, uploaded no new firmware. All is as it has been for months.
Dead printer till I figure this out.
