PowerNodeBlack-bringup

5 units; 24/04/09 fab date.

Initial Bringup / checkout

Board 003 (selected as sacrificial):

1. Optically checked soldering/board as is
2. Plug in USB-C
   1. Check 3v3 and 5v power; check red LED comes one.
   2. Check for magic smoke/things getting hot (nothing should)
   3. check detection of serial port/driver. It won't have any output at this point
3. PoE powering
   1. Solder in RJ45 connector
   2. Place solder bridges Vpwr, V5 to VPOE/VPOE5 in Source field and SS for both
   3. Plug in PoE ethernet; check voltages: 5V, 3v3 and Vpwr==5V
4. ESP32
   1. Solder in the ESP32
   2. Unplug PoE ethernet; plug in USB;
   3. Rework one - swap EN/IO0 at the transistors
5. PoE and ESP32
   1. Remove from USB; plug into PoE and check LEDs start flashing as soon as the power LED comes on.

From this point on - use a Galvanic USB isolator when connecting to the board with Ethernet plugged in.

1. Solder in Buzzer, OLED display (if needed), buttons, connectors
   1. Test with plain PowerNode install & check screen & menu cycling
   2. Check IP allocation on screen/serial and check web interface
2. Check RFID
   1. Use VNA to check if swiping does not work.
   2. Rework 2 - remove TVS protection diodes from the antenna. Too far off capacity wise (spec says a few pF; they appear to be in the 10s of nF).
3. (Optional) solder on final power selection, fuses, sensors, etc.