I'm able to power up my OLA using a USB C cable and log data on the SD card when powered in this way.
I've removed the jumper by cutting between the MEAS pins and connect a power supply (3.6V battery and 5V supply) to the Vin pin. When I press RESET, the PWR and STAT lights briefly light up and ~4mA are drawn from either supply. They then switch off and there is no further activity on the board.
Testing the board at various regulator outputs and bypass caps they seem to be at the correct value (3.3V), but the QWIIC power reg, SD power switch and ICM voltage reg are not being enabled by the Artemis.
The RTC seems to hold it's date/time when switching from USB to Vin supplies and back so I think that the backup RTC battery shouldn't be draining/causing the RTC to reset.
Is there any reason why the Artemis would fail to start up, which would cause them momentary flash of the LEDs and leave these power regs disabled? Am I doing something stupid in how I have connected by external supply, or are there further settings that need to be modified in the Terminal config?
Happy to provide more info if useful.