PowerNodeBlue-bringup

15 units; 25/01/23 fab date.

Initial Bringup / checkout

Board 001 (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
   3. Do not place the Vpwr/5V bridges in the PoE field - these should be better labeled: e.g. have an 'OFF' text added to them like the one just above.
   4. Plug in PoE ethernet; check voltages: 5V, 3v3 and Vpwr==5V
4. ESP32
   1. Solder in the ESP32 -- revision used:
      1. Chip is ESP32-D0WD-V3 (revision v3.1)
      2. MAC: 08:a6:f7:b0:72:ac
   2. Unplug PoE ethernet; plug in USB;
   3. Check 115200 baud visibility of ESP32 (press reset if needed). Should see

      ets Jul 29 2019 12:21:46 ... rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)

   4. Check upload with default Arduino example `Blink' app against LEDs set to OUT1/OUT2 (GPIO 16, GPIO4) with ESP32 -> ESP32-WROOM-DA module with settings and .
   5. Uploading at 115200 should work.
      1. If it fails - go drop speed
      2. For proper board with proper/non-counterfeit chips - 921600 baud works stable and well.
      3. Check the schematic for the 33 Ohm resistors that are supposed to help with the impedance/driving.
5. PoE and ESP32
   1. Remove from USB; plug into PoE and check LEDs start flashing as soon as the power LED comes on.
6. From this point on - use a Galvanic USB isolator when connecting to the board with Ethernet plugged in.
7. Solder in Buzzer, OLED display (if needed), buttons, connectors
   1. Test with plain PowerNode install & check screen & menu cycling
8. Check RDIF
   1. Holding an RFID card should cause two beeps. Use VNA to check.
   2. Check IP allocation on screen/serial and check web interface
9. (Optional) solder on final power selection, fuses, sensors, etc.

Problems during bringup

1. Solder bridge between pin 13/14 of ESP32 made it look like the switch was not working.

Improvements

1. Add the word 'OFF' to the labels of all bridges in the PoE field (and not just the top one)