PCB design: compact wearable (ESP32-S3 + nRF9160 LTE-M/GNSS + PPG sensor), 4-layer, JLCPCB assembly
Budget / SalaryC$250–750
TypeFreelance project
LocationRemote
Posted1 hour ago
PCB design: compact wearable (ESP32-S3 + nRF9160 LTE-M/GNSS + PPG sensor), 4-layer, JLCPCB assembly
I am developing a wrist-worn safety bracelet for elderly people (fall detection, SOS button, two-way voice calls, GPS, heart rate / SpO2 / skin temperature display). A working breadboard prototype and its firmware already exist.
I need an experienced designer for the schematic and PCB layout of the first prototype board (V1), ready for JLCPCB assembly (5 boards).
Main parts (already selected, LCSC numbers provided):
- ESP32-S3-MINI-1-N4R2 (Wi-Fi)
- Nordic nRF9160 (LTE-M + GNSS) with LTE chip antenna (incl. 700 MHz) and GNSS antenna
- MAXM86161 optical sensor (bottom side, against the skin)
- BMI270, TMP117, MAX17048, BQ21040, TPS63802, MAX98357A, ICS-43434
- Li-Po battery, magnetic charging pads (no USB connector), vibration motor, 2 buttons
Key requirements:
- Very compact: enclosure max 45 x 40 x 15 mm (PCB about 38 x 34 mm), two-sided assembly
- Good LTE antenna performance on a small board (top priority)
- Written power budget before layout (peak currents of radios + audio amplifier)
- ESD protection, sealed/waterproof device (no voltage on charge pads when off the dock)
- The product will later go through medical-device certification, so good practice from V1
Deliverables: schematic, editable source files (KiCad or EasyEDA - client owns them), Gerbers + BOM + CPL for JLCPCB, STEP 3D model of the assembled board, power budget, antenna tuning notes.
The full specification (PDF) is attached.
In your proposal, please include:
1. Examples of boards you designed with cellular modules (nRF91 or similar) and small antennas
2. Wearable or small battery-powered experience
3. KiCad or EasyEDA
4. Fixed price and timeline
5. Whether you include a design review call and support after the boards arrive
Proposals without cellular/antenna experience will not be considered.
I am developing a wrist-worn safety bracelet for elderly people (fall detection, SOS button, two-way voice calls, GPS, heart rate / SpO2 / skin temperature display). A working breadboard prototype and its firmware already exist.
I need an experienced designer for the schematic and PCB layout of the first prototype board (V1), ready for JLCPCB assembly (5 boards).
Main parts (already selected, LCSC numbers provided):
- ESP32-S3-MINI-1-N4R2 (Wi-Fi)
- Nordic nRF9160 (LTE-M + GNSS) with LTE chip antenna (incl. 700 MHz) and GNSS antenna
- MAXM86161 optical sensor (bottom side, against the skin)
- BMI270, TMP117, MAX17048, BQ21040, TPS63802, MAX98357A, ICS-43434
- Li-Po battery, magnetic charging pads (no USB connector), vibration motor, 2 buttons
Key requirements:
- Very compact: enclosure max 45 x 40 x 15 mm (PCB about 38 x 34 mm), two-sided assembly
- Good LTE antenna performance on a small board (top priority)
- Written power budget before layout (peak currents of radios + audio amplifier)
- ESD protection, sealed/waterproof device (no voltage on charge pads when off the dock)
- The product will later go through medical-device certification, so good practice from V1
Deliverables: schematic, editable source files (KiCad or EasyEDA - client owns them), Gerbers + BOM + CPL for JLCPCB, STEP 3D model of the assembled board, power budget, antenna tuning notes.
The full specification (PDF) is attached.
In your proposal, please include:
1. Examples of boards you designed with cellular modules (nRF91 or similar) and small antennas
2. Wearable or small battery-powered experience
3. KiCad or EasyEDA
4. Fixed price and timeline
5. Whether you include a design review call and support after the boards arrive
Proposals without cellular/antenna experience will not be considered.
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