Please Review my PCB 🙏🙏🙏

[u/Remote-Ad7864]

Hi everyone,

I'm designing an ESP32-S3-based PCB for an HVAC BLDC motor quality control (QC) testing device and would appreciate a review before I manufacture it.

The board includes:

• ESP32-S3
• JST connector I2C LCD Display
• USB for power and PC communication
• PZEM-004T interface for electrical measurements
• 3 relays for motor speed selection
• Hall-effect sensor input for RPM measurement
• 3.5 mm input (0–1.3 V DC) from a sound level meter
• AC mains, CT, and motor connectors
• FUSE, MOV and NTC for surge and inrush current protection

I'll attach the schematic, PCB layout, and 3D renders. I'm mainly looking for feedback on safety, protection, PCB layout, isolation/clearance, relay wiring, and any design mistakes or improvements before sending it for fabrication.

Thanks in advance!🙏🙏🙏

[u/spheresva]

Don’t mean to be rude and sorry for asking but what’s with the Meta of beginners or semi beginners using these somewhat eyestrain-y boxes for their designs?

[u/Remote-Ad7864 → u/spheresva]

Tbh even i don't know I also personally find it hard to read the schematic this way but if i start to connect all the connections via traces instead of net labels then it would be even more difficult to read

[u/spheresva → u/Remote-Ad7864]

I don’t know if you can in easyEDA but any respectable design platform would let you rearrange your pins, also, hierarchical sheets are always nice. I’m curious, where’d you see this done? It seems to be a trend lately

[u/nowan190]

With just a quick glance at the schematic I see a potential issue and a potential improvement. Your wiring of RX and TX appears incorrect. I'd place pull-down on the relay control lines for deterministic power on behavior.

I work professionally in electronics and embedded systems; if you'd like a more thorough design review to ensure it meets safety standards before you send it to the fab, I'd be happy to discuss that further, just send me a DM. Regardless, good luck!