Hey! I was just thinking about building a tiny, battery‑powered weather station that runs on a single solar cell. Imagine a little box that tells you temperature, humidity, and maybe a cute LED display. Do you want to dive into the design together?

Okay, here’s a quick sketch of the layout (text version). Top layer: - 3.7 V Li‑ion cell sits in the corner, connect to a tiny DC‑DC boost to 5 V for the MCU (use a low‑drop 5 V regulator, maybe a buck‑boost if you want to keep it ultra‑low‑power). - MCU (like an ATTiny or ESP32‑C3) right next to the cell, pin‑header side‑by‑side. - Temperature sensor (LM75) wired to I²C (or one analog pin if you’re using something like the DS18B20 1‑wire). - Humidity sensor (a tiny HTU21D or a simple capacitive sensor) also on the I²C bus. - Tiny LED display – a 4‑digit 7‑segment or an OLED 0.49" – wired to a couple of GPIOs or I²C. - A small 100 µF capacitor across the MCU VCC for smoothing. Bottom layer: - Solar cell on the top of the PCB, connect to the battery via a diode or a charge‑controller (like an MCP73871). - Add a 10 µF ceramic cap near the cell input for extra smoothing. - Keep traces short, use a 30 mm PCB so you can 3D print a case. That’s it, all the parts in a tiny box, no fuss. Need to pick a board shape? Let's go round‑about 20 mm square and see if we can fit everything?