I'm still working on my first self designed PCB. It's nothing special, just a temperature and humidity sensor using esp32. I started it to teach myself more about PCB design and embedded programming. Yesterday I published a blog article on it. https://www.felixmaurer.de/blog/2024/10/27/building-an-iot-s...
This is something similar to what I've been working on. Currently designing a HAT for a Raspberry Pi that includes temp/humidity sensor as well as particle matter (PMS5003). Trying to end up with my own personal weather station which I'll then publish to a small web app.
