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Field Test
09/18/2021 at 19:13 • 0 commentsSalem was tested at a local historical site by a local 'paranormal' group.
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Github Repo
09/06/2021 at 15:08 • 0 commentsIncluded in the gihub repo are all of the project files. This includes the firmware, step files, parts list/bom, jlcpcb gerbers generated from eagle.
The programming board project files are also located in the repo, its designed to be used with the STlink V2 programmer.
The antennas were sourced from the `sketch` alliexpress site... so builder be warned.
I also don't think I implemented the internal temp sensor correctly, but it dose change with temp, the offset is just really out of whack, might be a silicon bug.
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Dev
09/06/2021 at 15:02 • 0 commentsI spent some time bread boarding popular circuits I found with my ninja like google-foo. Unhappy with the performance, I opted for a dedicated IC [FDC1004]. This IC is both source-able, and gives predictable and repeatable results. I went through three hardware revisions before settling upon "this" one. Changes included the power management circuit, UI layout and antenna placement.
Battery life was also another major concern, I didn't want to use rechargeable batteries (sorry environment), and I wanted relatively long runtime.
I did want an enclosure, but I really liked the way the bare board looked.