This log describes the recommended assembly instructions for the Buoy B V1.0 PCB. The following image shows all the required components, with an identification number that will be used in the log.

Components List:

1. ESP32-DEVKITC-32D
2. TB6612FNG MOTOR DRIVER BOARD
3. CONN HDR 19POS 0.1 TIN PCB
4. CONN HDR 9POS 0.1 GOLD PCB
5. CONN HDR 9POS 0.1 GOLD PCB
6. CONN HDR 8POS 0.1 TIN PCB
7. CONN HDR 8POS 0.1 TIN PCB
8. Buoy B V1.0
9. CONN HDR 19POS 0.1 TIN PCB
10. TERM BLK 2P SIDE ENT 5.08MM PCB
11. TERM BLK 2P SIDE ENT 5.08MM PCB
12. TERM BLK 3P SIDE ENT 5.08MM PCB
13. CONN HDR 6POS 0.1 TIN PCB
14. CONN HDR 5POS 0.1 GOLD PCB
15. CONN HEADER VERT 3POS 2.54MM
16. CONN HEADER VERT 3POS 2.54MM
17. CONN HEADER R/A 3POS 2.5MM
18. Coin cell holder (included in Adafruit Ultimate GPS)
19. Adafruit Ultimate GPS
20. CONN HDR 16POS 0.1 TIN PCB (included in Adafruit Ultimate GPS)
21. RFM95W LoRa Radio
22. CONN HEADER VERT 16POS 2.54MM (included in RFM95W LoRa Radio)

It is possible to solder the components in many different orders, I'll describe the one that I followed, it can used as a reference.

Instructions

a.Solder the female headers 3 and 9 used to connect the ESP32-DEVKITC-32D to Buoy B V1.0.

Once the female headers are soldered, the ESP32-DEVKITC-32D connects to Buoy B V1.0 through the headers.

b.Solder the female headers 6 and 7 used to connect the TB6612FNG MOTOR DRIVER BOARD to Buoy B V1.0.

 The TB6612FNG MOTOR DRIVER connects to Buoy B V1.0 using the headers.

c. Solder the female header 13 to Buoy B V1.0.

d. Solder the 3POS Horizontal JST-XH connector (17).

e. Solder the male header 15.

f. Solder the female headers 5 and 14 used to connect the RFM95W LoRa Radio to Buoy B V1.0.

g. Solder the male headers 22 to the RFM95W LoRa Radio. To do that it is necessary to cut a CONN HEADER VERT 9POS 2.54MM and a CONN HEADER VERT 5POS 2.54MM from the component 22. The RFM95W LoRa Radio connects to Buoy B V1.0 through the headers.

h. Solder the female headers 4, used to connect the Adafruit Ultimate GPS to Buoy B V1.0. Solder the male headers 20 to the Adafruit Ultimate GPS. To do that it is necessary to cut a CONN HEADER VERT 9POS 2.54MM the component 20. The Adafruit Ultimate GPS connects to Buoy B V1.0 through the headers.

i. Solder the male connector 16 to Buoy B V1.0. 

j. Solder the terminal blocks 10, 11 and 12 to Buoy B V1.0. 

Front Layer and Back Layer

The modules connected to the front layer of Buoy B V1.0 are the ESP32-DEVKITC-32D and the TB6612FNG MOTOR DRIVER BOARD.

The modules connected to the back layer of Buoy B V1.0 are the Adafruit Ultimate GPS and the RFM95W LoRa Radio.