A Bluetooth Low Energy (BLE) soil moisture sensor

• b-parasite

  18 1,742 7.1 C

  🌱💧 An open source DIY soil moisture sensor

  I can see how your prototype defends against corrosion, not so much this b-parasite toy.

  What I don't see anyone talking about is the impact of dielectric moisture absorption[1], which is typically around 0.3-0.5% for cheaper FR-4 on the market, on corrosion, let alone how this product intends to maintain sensor calibration over time.

  I'd expect to see external corrosion impact at the solder joints first, especially around the battery terminals, but corrosion creep may happen alot sooner than that: vias in the b-parasite prototype are clearly tented[2], but that masking is superficial and won't protect against hygroscopic exposure from the inside; being open source certainly doesn't preclude hobbyists from making even worse material decisions.

  [1] https://www.ipc.org/sites/default/files/test_methods_docs/2....

  [2] https://github.com/rbaron/b-parasite/blob/main/img/resized/i...

• Healthchecks

  207 7,261 9.7 Python

  Open-source cron job and background task monitoring service, written in Python & Django

  

  > Knowledge of plain old CGI on a web server seems lost due to fancy frameworks?

  eh I just never learned it. I'm a robotics engineer and I tend to write programs in Python (or less commonly now, C++) to run in a loop and deal with local hardware. The way that web servers operate in a stateless multithreaded way involves some peculiarities that I always find a little tricky.

  > I sometimes transfer data with curl via a url which does not exist, but where a script running on the server watches the server's error log and extracts data from those entries.

  Hey that's a nice trick! I already have a server running discourse. Maybe I can sneak something in there. Though it looks like someone's suggestion of https://healthchecks.io/ might do what I need.

• InfluxDB

  www.influxdata.com

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• Home Assistant

  1,410 68,378 10.0 Python

  :house_with_garden: Open source home automation that puts local control and privacy first.

  

  Write a Home Assistant [0] integration and suddenly you will gain a large set of followers who will also get it into the other closed systems.

  [0] https://www.home-assistant.io

• homeassistant_ecowitt

  2 141 0.0 Python

  Ecowitt Weather Station integration for homeassistant

• rtl_433

  172 5,719 9.3 C

  Program to decode radio transmissions from devices on the ISM bands (and other frequencies)

  Not OP, but I use these to monitor my plants. I use a HackRF and the following software to collect the data.

  https://github.com/merbanan/rtl_433

  It works okay: it drops around 10% of the data due to reception issues, but I think it might be related the parameters I have set for the gain on the software defined radio.

• WorkOS

  workos.com

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