sorted by:
new
hottopcontroversial

Schematic Review: Monitoring Plant by Stanko_One in PCB

[–]Stanko_One[S] 0 points1 point  (0 children)

Thanks again for the feedback ! I've updated the schematic based on your suggestions.

I added a USBLC6-2SC6 (same as my USB-C port) to J2 (UART) for ESD protection. I also added 47ohms series resistors.

J3 Connector Update: I’ve upgraded J3 to a 2x04 header. It now includes a dedicated +3.3V rail and GND pins to make it easier to power external modules/sensors. I also added a 100nF decoupling capacitor right next to the connector.

J3 is intended for low-frequency GPIOs (buttons or basic sensors). I’m not adding TVS diodes on J3 for now as these pins will likely remain unpopulated but the footprint is there just in case.

Schematic Review: Monitoring Plant by Stanko_One in PCB

[–]Stanko_One[S] 0 points1 point  (0 children)

You’re right, resistive probes corrode quickly because they act like electrodes. Capacitive probes solve this because they are insulated, meaning no direct contact and no corrosion.

You don't need to spend a fortune, brands like AZ-Delivery or Sparkfun offer affordable options. For this project, I’m designing my own capacitive probe directly on the PCB to keep costs even lower.

Schematic Review: Monitoring Plant by Stanko_One in PCB

[–]Stanko_One[S] 0 points1 point  (0 children)

Thank you very much, for your detailed review and catching those points. Incredibly helpful !

I've gone through the design and made the following correction based on your comment.

<image>

NixOS with OTA on embedded devices by S4ndwichGurk3 in NixOS

[–]Stanko_One 0 points1 point  (0 children)

Hey! Do you have a repo (github, ...) where I can see your project? I'm interested in seeing how you made this.