Standalone Handheld Device Creation

I’m developing a dedicated handheld that will operate offline. No Wi-Fi, Bluetooth, cellular, or any other radio is required, so the entire design has to function in isolation. Because of that restriction... (Budget: $5000 - $10000 USD, Jobs: 3D Design, 3D Printing, Electronic Design, Electronics, Firmware Development, Microcontroller, PCB Design and Layout, PCB Layout, Product Design, Raspberry Pi)