Wrist-Wearable Device Design & Production

Objective
Design a wrist‑worn wearable device with the following hardware specifications. The freelancer will deliver schematics, PCB layout, enclosure design, BOM, and a list of manufacturers capable of producing the PCB, touchscreen, and enclosure. The device must be engineered correctly to support firmware flashing via USB‑C. Firmware development will be handled separately using ESP‑IDF.

Hardware Requirements
Core MCU

ESP32‑S3 (mandatory).

USB‑C interface for charging and firmware flashing.

Radio Module

Integrated 915 MHz transceiver (Semtech variant or other well‑known IC acceptable).

Properly tuned PCB antenna or chip antenna suitable for compact wearable enclosures for the radio transceiver.

The ESP can use SKU with the built-in antennae, I will only be using the BLE function of this not the Wi-FI

No additional sensors, biometrics, gps, etc are needed.

Display

1.28" circular capacitive touchscreen.

Must support basic UI rendering and touch input.

Haptic Feedback

At least 1 LRA (Linear Resonant Actuator) motor, with support for up to 3 motors if space permits.

Motors should be positioned to maximize vibration strength while maintaining slim profile.

Buttons

3 momentary push buttons on the enclosure sides:

2 on the right, 1 on the left.

Very low‑profile, sleek integration into the enclosure.

Exposed as GPIO inputs for firmware control.

Power Management

Rechargeable LiPo battery sized for slim wrist‑worn profile.

USB‑C charging circuit.

Power management IC for efficient battery usage.

Enclosure

Wrist‑worn with silicone straps.

Enclosure diameter matches the 1.28" touchscreen.

Mostly solid body with slim overall height/profile.

Reference photos of general shape/profile will be provided.

Freelancer may design enclosure themselves or subcontract.

Deliverables
Schematics and PCB design files (Gerbers, pick‑and‑place, etc.).
Bill of Materials (BOM) with specific part numbers for MCU, transceiver, touchscreen, LRA motors, buttons, battery, and PMIC.
Enclosure design files (CAD/3D models).
Documentation for flashing firmware via USB‑C.
Basic firmware stub (screen test, vibration motor test, button input test).
List of 2–4 manufacturers capable of producing:

PCB fabrication and assembly.

1.28" circular capacitive touchscreen sourcing.

Enclosure manufacturing (plastic/silicone straps).

Notes
No radio certifications or compliance testing required.

Freelancer’s main responsibility is engineering correctness of the design and identifying viable manufacturers.

I've included 3 examples or the rough idea of how I would like the enclosure to look like, again I want the touchscreen to be round. There is a rectangular enclosure included for context. I'm not totally opposed to that but I would prefer circular.

Please don't hesitate to ask any clarifying questions before placing a bid.

Depending on how well this goes there may be additional projects that go along with this. I am well versed on the software side of devices like this, and i do have rudimentary pcb and schematics that I created prior to seeking assistance on the project which I could share to give you an idea of what I am trying to accomplish but I doubt they will be needed if you know what you are doing.

I really need someone who understands the whole process of producing a device like this. I don't have an unlimited budget and I really want to get to the point where I can produce a few prototypes and then go from there. Ultimately I need to produce a device that is in a reasonable price range for what would be the end user, so trying to keep it as simple as possible while still having all the functionality it needs.