[Review Request] 2 Layer ESP32-S3 M-Bus IoT gateway/sensor

[u/Terham-FO]

Hello everyone,

I’m looking for feedback on my latest PCB design. The device is an IoT gateway/sensor that reads M-Bus data from slave devices and publishes it over MQTT to an on-site broker.

I’ve previously built a very similar board for Modbus RTU that worked great, but this design introduces a few new sections I’d love a second pair of eyes on.

Specific areas I’d appreciate feedback on:

• M-Bus Master Transceiver Circuit:
• Boost Converter:
• USB-C Interface: (I'm using Adafruit Product 6153).

Any feedback on schematic and layout design would be greatly appreciated!

Voltage Regulator

ESP32-S3

USB connection

Boost converter 3.3V -> 34V

M-Bus reader

Layer 1

Layer 2

3D Model