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Supplemental Assembly Procedure for HBG3-Relay

The HBG3-Relay is constructed by combining a HBG3-Relay PCB with a regular HBG3. This can be done after the fact, but is easier if one installs the three power wires (yellow, black, red) earlier, before attaching the ESP32 module to the main HBG3 PCB.
Solder the three power wires (yellow, black, red) to the main HBG3 PCB. These should be about 3"/8cm in length. If your HBG3 was already assembled without these wires, then the OLED display will need to be detached on one side and bent out of the way. Otherwise, it is best to add these wires much earlier, before soldering the ESP32 module in place.
pxl_20240320_201204456 		After soldering, route the wires through the holes to the ESP32 side of things, as shown.
pxl_20240320_201339491 		Solder two RJ12 jacks to the component side of the Relay PCB, and trim the leads of each very short, as shown. It is easiest to trim them before soldering.
pxl_20240320_201851539 		Solder a regular length 3-pin header to the Relay PCB, as shown.
pxl_20240320_202321288 		Remove the black plastic from the 3-pin header after soldering. Otherwise it prevents soldering to the ESP32 later.
pxl_20240320_202406394 		Stick some (black) 3M tape to the top of the ESP32 metal can, as shown. Do not block the tiny little ventilation hole! Also, stack two tiny bits of 3M tape on top of the USB jack -- a single bit isn't thick enough there, so stack two bits of tape.
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Push the Relay PCB onto the top of the ESP32, threading the 3-pin header into D14, D27, D26. The header might not extend all the way through the purple HBG3 PCB, but that doesn't affect anything.
pxl_20240320_202512458 		Solder the 3-pin header directly to the component side of the ESP32 PCB. If the pins reach far enough, one can also solder them to the purple HBG3 PCB, but this is not necessary for anything.
pxl_20240320_202612955 		Now trim and thread the black (GND) wire to the GND pad of the Relay PCB. Also thread the yellow (RAW) wire to the 12V pad beside the GND pad. Solder them in place, then trim them short.
pxl_20240320_203251163 		Thread a small bare wire through the RX pad of the Relay PCB, bending it down to D34 of the ESP32. Solder both ends, and trim any excess. Then thread the red (5V) wire up through the 5V pad of the Relay PCB, and solder/trim it in place.
pxl_20240320_203306660 		Another view of the RX and 5V wires.
pxl_20240320_203326315 		Assembly is now complete. Plug the main HBG3 AUX port to a mount, and power it on. The version number shown on the OLED should have an 'r' prefix now instead of 'v'. If not, something is wrong. Otherwise, power-off, and plug a hand-controller into one of the relay ports, and power up again. Verify that the hand-controller successfully finds the mount. Done.
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Another view of the completed HBG3-Relay unit.
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