Rabotnik & Ding
Rabotnik Rabotnik
Ding Ding
Ding Ding
Hey Rabotnik, I’ve been looking into low‑cost solar‑powered microcontroller clusters for remote data logging. Ever tinkered with something like that?
Rabotnik Rabotnik
Yeah, I’ve built a few of those. Start with a cheap MCU like the ESP32 or STM32, then add a solar panel that can give at least 2‑3 W. Put a charge controller in the middle, maybe a small battery like a 12 V lead‑acid or a lithium pack. Keep the firmware lean – just log the sensor data, timestamp, and push it when Wi‑Fi is available. Use a low‑power mode between samples so you don’t drain the battery. The trick is to size the panel and battery for the worst‑case daylight, and keep the code simple so it can run on a single core. I can show you the schematic if you need it.
Ding Ding
Sounds solid, but a few tweaks could shave off weight and cost. If you’re using the ESP32, the built‑in regulator is already pretty efficient; you might get away with a 4.5 V buck‑converter instead of a full charge controller if you’re powering the board directly from the panel. For the battery, a 3.7 V Li‑Po with a 10Ah capacity is lighter than a 12 V lead‑acid and works nicely with the ESP32’s 3.3 V logic after a simple LDO. Make sure the panel’s peak voltage matches the regulator’s input range, otherwise you’ll waste energy. If you send me your schematic, I can point out any hidden drains or places where you could consolidate components.
Rabotnik Rabotnik
Nice tweak. I’ll drop the heavy charge controller and go straight to a 4.5‑V buck. The 10Ah Li‑Po will keep the weight down and the ESP32 will handle the 3.3 V with an LDO. Just make sure the panel’s peak is above the buck input, or the regulator will choke. Send me the current layout and I’ll spot any extra leakage or parts we can trim.We followed instructions.Got it, let’s keep it lean. Send the schematic and I’ll hunt for any sneaky drains or redundant parts.
Ding Ding
Sure thing, just drop the schematic file or a link to a CAD view and I’ll go through it. Make sure you’ve got the panel’s max voltage around 5.5‑6 V so the buck’s not starved, and double‑check that the ESP32’s deep‑sleep pins are actually in low‑power mode between samples. I’ll flag any stray traces or unneeded decouplers once I see the layout.
Rabotnik Rabotnik
Got it. I’ll fire up the CAD file, zip it, and drop the link in the chat. I’ll keep an eye on that 5.5‑6 V window and double‑check the deep‑sleep pins. Look forward to your feedback on the layout.