Embedded System Developement

I’m building an Arduino-based device that brings together multiple sensors, motion components, and wireless modules, all coordinated through a clean UART link. The goal is a fully documented firmware stack and wiring plan that I can upload, power up, and demonstrate without extra tweaking.

Hardware that must be supported
• Temperature sensor
• Ultrasonic sensor
• IR sensor
• GPS module
• L298N driver + stepper motor
• Servo motor
• Bluetooth module
• WiFi module
• Battery pack interface
• Mobile-app connection over UART

Scope of work
• Write a well-commented Arduino sketch (C/C++) that polls each sensor, controls both motors, handles GPS data, and routes everything through a single-frame UART protocol.
• Provide or configure lightweight drivers/libraries so there are no pin conflicts.
• Define the serial command set that my mobile app can use for real-time control and telemetry.
• Supply a clear wiring diagram (Fritzing, KiCad, or similar) showing power rails and logic-level shifts where needed.
• Include a concise setup & test guide so I can reproduce your results on my bench.

Acceptance criteria
1. Code compiles without warnings on the current Arduino IDE.
2. Continuous 30-minute bench-top run with stable motor control and sensor reads.
3. All documentation is complete enough for a second developer to extend the project.

If you have solid experience squeezing this much hardware onto a single Arduino and keeping it responsive over UART, your insight will be highly valued here.