- The angle of -30 was not displaying correctly with unsigned type
- Explicitly cast a result to a double for consistent typing
- The code without snprintf didn't work. Revert to snprintf, but also
switch to RP2040 which has room for it.
Now the OLED display is no longer scrambled, but there are two new problems with it:
1. The number "506" is printed over the design
2. The screen never refreshes. As originally submitted, the OLED
would update to reflect layer changes.
