Salem is an adaptation of the popular "ghost" detector

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After reviewing "ghost hunting equipment" for a friend, and being unhappy with current "ghost hunting gear" on the market, I developed this. Dose it Work? it detects my hand, I can't claim it detects anything paranormal.

The motivation for posting this project is two fold. One, to enter the halloween hackfest of course. The second, being to educate aspiring ghost hunters about "ghost hunting equipment".

Please see my github repo for a more comprehensive outline of the project. This project is no longer in active development.

This device will be tested on an up and coming ghost hunt (I'm not an active participant)


debugging with adafruit!!

Portable Network Graphics (PNG) - 3.20 MB - 09/06/2021 at 16:02


x-zip-compressed - 38.16 kB - 09/06/2021 at 15:10


x-zip-compressed - 141.67 kB - 09/06/2021 at 15:10



3d model

step - 5.20 MB - 09/06/2021 at 15:10


SV3 v5 000.png

render 2

Portable Network Graphics (PNG) - 336.08 kB - 09/06/2021 at 14:54


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  • Field Test

    Matthew McCardle09/18/2021 at 19:13 0 comments

    Salem was tested at a local historical site by a local 'paranormal' group.

  • Github Repo

    Matthew McCardle09/06/2021 at 15:08 0 comments

    Included 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.

  • Dev

    Matthew McCardle09/06/2021 at 15:02 0 comments

    I 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.

View all 3 project logs

  • 1
    Abridged to the Max

    After tedious SMD assembly (can't help with that), the only thing required is a M3 screw and lock washer for the antenna.

  • 2

    ummmm..... Adafruit's ItsyBitsy M4 Express was used for debugging and brownie points.

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