I spent a couple days and built a robust board that can accommodate up to 8 analog or digital channel inputs and 5 dedicated digital inputs.
The primary interface is DB25 PCB mount. This is the preferred terminator for aircraft use at it is vibration resistant, reasonably priced, highly available and most importantly mechanically-secured multi-terminal connection.
The DB25 connector has 6 ground pins, 3-12v supply, 3-5v internal (500ma max) and all the pinouts for all digital and analog channels.
Supports up to four I2C ports, one is intended for the inertial module and one for the 1602 display. 2 additional I2C ports are available for future expansion.
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