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Show HN: Water Monitor – Show pH, EC etc for hydroponics. Firmware in Rust
- the__alchemist 5y agoI've been working on this for about a year, and learned a lot about various elements of electronics and product design. Let me know if you have any questions on how it's designed, built, tools used, launching a product during the MCU/IC shortage etc. It's aimed at hydroponics, aquariums, swimming pools etc, but also serves as a demo of a (small so far!) production device programmed in Rust. Water Monitor URL: https://www.anyleaf.org/water-monitor https://www.anyleaf.org/water-monitor - I think I goofed on the URL submission
- steveklabnik 5y agoVery cool! I think I missed it, or maybe it's not on the page because it's not relevant to the audience, but what MCU are you using? Always curious to see what people pick.
- the__alchemist 5y agoGreat question - and you're right about that page not including it due to the audience. It's an STM32L4. (L443 specifically). I went with it since it's a versatile, well-documented MCU aimed at low-power, non-RF uses. I almost had to delay launch due to a shortage, but I got lucky when F5ing Digikey before they went out of stock again! Using a QFP footprint, although may switch to QFN on a future revision to avoid bent pins, and solder bridges high on the pins. A blog article I posted a few days ago on the website goes into some detail about Rust, with a focus on STM32.