Salem is an adaptation of the popular "ghost" detector
Already have an account? Log in.
To make the experience fit your profile, pick a username and tell us what interests you.
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)
detected.pngdebugging with adafruit!!Portable Network Graphics (PNG) - 3.20 MB - 09/06/2021 at 16:02 |
|
|
adapter_2021-09-04.zipgerbersx-zip-compressed - 38.16 kB - 09/06/2021 at 15:10 |
|
|
SV3_2021-09-04.zipgerbersx-zip-compressed - 141.67 kB - 09/06/2021 at 15:10 |
|
|
SV3.step3d modelstep - 5.20 MB - 09/06/2021 at 15:10 |
|
|
SV3 v5 000.pngrender 2Portable Network Graphics (PNG) - 336.08 kB - 09/06/2021 at 14:54 |
|
|
Salem was tested at a local historical site by a local 'paranormal' group.
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.
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.
After tedious SMD assembly (can't help with that), the only thing required is a M3 screw and lock washer for the antenna.
ummmm..... Adafruit's ItsyBitsy M4 Express was used for debugging and brownie points.
Matthew McCardle
MicroHex
AKA
O. Alan Jones
Steven