KiCad Hardware Design from Requirements – ESP32-S2 USB-C / USB Host / RS232 Board for JLCPCB PCBA Ended

Project title:
KiCad Hardware Design from Requirements – ESP32-S2 USB-C / USB Host / RS232 Board for JLCPCB PCBA

Project description:

We need an electronics / PCB design engineer to create a production-ready KiCad hardware design for an ESP32-S2 based TCP USB / Serial Bridge.

Important clarification:
We do not have a final validated schematic. The existing KiCad files are only rough draft / handoff references and may need to be rebuilt properly.

What we already have:

* functional requirements
* system architecture notes
* firmware pinout
* net connection matrix
* candidate BOM
* routing / trace-width rules
* PCB placement/mock reference
* visual PCB reference

What we need:
The engineer must create the proper final KiCad schematic from the requirements, validate the circuit, select suitable JLCPCB/LCSC components, complete the PCB layout, and generate all manufacturing files for JLCPCB PCBA.

Main hardware:

* ESP32-S2-MINI-2 module, Wi-Fi only
* USB-C for service/programming and 5V input
* optional 1S Li-Ion/LiPo battery connector
* Li-Ion charger / power-path circuit
* battery-to-5V boost converter, target 5V / 2A if practical
* power mux / no-backfeed between USB-C 5V and boosted 5V
* USB Host solder pads
* USB Host VBUS current-limited power switch
* USB data 2:1 switch between USB-C and USB Host
* RS232 through MAX3232E or equivalent
* RESET and BOOT buttons
* STATUS and CHG LEDs
* UART0 debug header
* GPIO/test pads

Critical UART0 rule:
UART0 DEBUG / TEST must contain only:

* 3V3
* TX0 / GPIO43
* RX0 / GPIO44
* GND

Do not place EN, IO0/BOOT, USB D-, or USB D+ on the UART0 header.

Preferred PCB:

* 2-layer PCB if practical
* 1 oz copper
* ground pour both sides
* wide copper / pours for battery, boost, SYS_5V and USB_HOST_VBUS
* compact size, target around 50 x 32 mm, max around 55 x 35 mm if practical

Assembly variants:
Please design the same PCB so it can support two BOM/PCBA variants if practical:

Variant A — Full:

* battery charger populated
* battery connector populated
* 5V boost populated
* power mux / no-backfeed populated
* USB Host can be powered from USB-C or battery boost

Variant B — USB-C only:

* battery connector not populated
* charger not populated
* boost converter not populated
* battery-related parts marked DNP / Not Populated
* board powered only from USB-C
* USB Host VBUS powered only from USB-C through the current-limited power switch

Required deliverables:

1. final KiCad project
2. final KiCad schematic
3. final KiCad PCB layout
4. Gerber files
5. drill files
6. BOM with final JLCPCB/LCSC part numbers
7. CPL / pick-and-place file
8. ERC report
9. DRC report
10. short JLCPCB upload instructions
11. notes for Full version and USB-C-only DNP/BOM variant

Please apply only if you can do the actual circuit/schematic design from requirements, not only copy or review an existing schematic. read less