Rev 3 PCB

The only change to this release is the WLCSP paste layer for factory assembly

Flash your device via J-Link using the command:

nrfjprog --program s1-ecg-kit-firmware-*.hex --chiperase --verify --reset

Rev 2 PCB

Added pull-up resistor to 1.8v on ECG amp shutdown pin
Moved current probe header down to be better in line with the edge of the PCB
Removed the cuttable jumper
Isolation around battery positive terminal
Cleaned up silkscreen
Added 0.1" pin jumper to BOM

Rev 1 PCB

Boards ordered 19th August 2021