Assembly
Electronics
TODO: more detailed protoboard guide
Wiring
| Pin | Where |
|---|---|
| GND | OLED GND |
| 3.3V | OLED VCC, Both switches on neutral |
| D4 | OLED SCL |
| D5 | OLED SDA |
| D1 | Left switch |
| D3 | Right switch |
Battery Management
If you want to add the battery to the system, you also have to connect the following pins:
| Pin | Where |
|---|---|
| Bat + (Soldered on back) | + on your Battery |
| Bat - (Soldered on back) | - on your Battery |
Additionally, you’ll want to build a Voltage Dividers, using 2 220kOhm resistors, and connect the following pins:
| Vin | Vout |
|---|---|
| Bat+ | D8 |
Case
Both the front and back have recesses to fit four magnets.
The magnets are used to align the two shell pieces and ensure they stay together.
(Magnets were choosen as they keep the inside accessible should something break)
Start by glueing the magnets to the front
(the orientation doesn’t matter as long as the magnets on the back have the correct orientation).
Once hardended, you can place one magnet on each of the ones you just glued in,
to ensure proper orientation and slide it onto a metalic surface (without flipping it).
Now put some glue on the top and push the magnet into the back with the glue facing down.
(You might have to use a wooden rod to push them down till they reach the bottom.
When the glue is set, the magnets should stay in place and allow the case to snap together.
The front and back of the case also have pins sticking out, which slot into the cutout on the top of the arms.
The arms should be placed with their extended cylinder pointing toward the front, so that they’ll interface with the microswitches.