MiniPCB3

This design is built around the Teensy4.0 and supports the most important features while keeping the same small size and a similar layout to the MiniPCB v2.

There's a power jack, fuse, and power switch connection.
There's a USB Port.
There's provision for an XAIO ESP32-S3 device for WiFi etc., this gets firmware uploaded through its onboard USB-C port.
There's a RJ12 modular connector that can provide Gnd/5V and general purpose I/O on this connector (defaults to PEC/Limit/Reticle.)
There's a RJ12 modular connector that can provide Gnd/5V and general purpose I/O on this connector (defaults to ST4 interface.)
There's two stepper drivers (one for RA/Azm and one for Dec/Alt.)

Unlike the MiniPCB v2 this device adds the following new features:

Supports nearly any StepStick driver including Legacy, TMC-SPI, and TMC-UART.
Uses JST-XH2.54 connectors where appropriate.
Supports I2C and has onboard provision for FRAM NV memory.
Onboard mini speaker.
The two RJ12 modular connectors RJ3 labeled "ST4" and RJ4 labeled "Aux" each have Gnd, +5V, and four GPIO pins with 2K pullup resistor (and optional ESD protection using a diode clamp device.)
- The connector RJ3 GPIO pins are routed to the Teensy4.0 (OnStepX) and the connector RJ4 GPIO pins are routed to the ESP32-S3 (SmartWebServer.)
- These eight GPIO pins can optionally provide some combinations of:
  - ST4 port, encoder inputs for servo operation, TTL Serial, or CAN BUS on RJ3.
  - Encoder inputs for pointing, on RJ4.
  - Sense inputs for Limit, Home, and/or PEC on RJ3 or RJ4.
Optional - Step and Dir connections on both Axis1 and Axis2 have PWM capability for DC motor based servo operation.