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The Voodoo Project: A PULSE INDUCTION METAL DETECTOR WITH IRON REJECTION

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Description

Pulse induction metal detectors are very sensitive to ferrous (iron) targets, and one that can ignore iron has been a sort of holy grail for metal detector developers for some time.The Voodoo Project is a written record of the author’s personal mission to design and develop a working pulse induction (PI) metal detector that is capable of good iron rejection.Voodoo is a hybrid detector that has features of both a PI and a VLF. The design goal was to develop a PI that can be used both inland and on the beach. In particular, special attention was devoted to finding non-ferrous targets in areas infested with ferrous trash. Rejection is not based on target conductivity, as Voodoo provides true ferrous/non-ferrous discrimination. Read more

Publisher ‏ : ‎ Independently published (October 2, 2020)


Language ‏ : ‎ English


Paperback ‏ : ‎ 152 pages


ISBN-13 ‏ : ‎ 44


Item Weight ‏ : ‎ 7.5 ounces


Dimensions ‏ : ‎ 6 x 0.35 x 9 inches


Best Sellers Rank: #2,296,523 in Books (See Top 100 in Books)


Customer Reviews: 4.5 4.5 out of 5 stars 16 ratings


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Top Amazon Reviews

    • Very interesting
Well written. Full of important information
Reviewed in the United States on April 17, 2021 by D Spear
    • Poor documentation of an amateur project--this should not be a book.
I bought Inside the Metal Detector which was OK, but this one was disappointing. This really shouldn't be a book. It's very thin (in thickness and information)--83 pages plus appendices, and just fattened up with two (duplicate) copies of a listing of the C firmware source code (which is about 3-4x as long as it needs to be, see my comments below on the code). Really wide margins and lots of white space. My review will wind up being 1/10 the word count of the book. There are typos, and he omits key explanations and beats other dead horses. For example, the detector is based on a concentric coil made to resonate at a certain frequency by adding a parallel capacitor. But there's no explanation about the physics behind the parallel capacitor, its usefulness in locating metal, or any logic about the selection of the resonant frequency. So you have to take the dude's word about the whole central gimmick of this detector (after he says in the book how you can't trust other detector designs that claim to make discriminating PI's). If this is genuinely novel and actually works, why can't he explain how it works (or better yet, patent it!)? In the chapter about the depth capability of the detector with differing coils, everything is referenced to the first coil. But he never makes it clear whether that coil was able to locate the 3rd deepest target. Just that it found 1 and 2, but 4 and 5 are impossible. So we are lacking a feel for how deep the detector in this project can go. The electronic design is amateurish. For example, a signal is run through an amplifier made with an op amp, and then afterwards, level shifted by a separate resistor divider referenced to ground instead of just being handled by the op amp. The constant frequency audio oscillator signal is generated by a 555 timer circuit when there are unused pins on the PIC chip that does all the other digital work. The schematics are drawn up in a CAD software that no professional would be using, and are printed too small to read clearly. The code is horrendously cringe (for example, global variables named "i" and "t", "encapsulating" the code in functions that return void but write to a single global variable, etc). Eight separate identical functions calculate the values for the timers into differently named global variables, instead of using one function with parameters. Not only is this noobish and bad coding practice, it makes what you're trying to teach the readers much less clear. Tons of poor coding practice - variables and constants in the same case, nested if statements instead of switch, etc. So painful to read. Like the schematic, the code is written in and is reliant on an IDE/platform ("mikroC") that no developer beyond the most beginner hobbyist would consider using for a project, particularly with MPLAB IDE being free. I can understand an expert writing a book to share their expertise with the world, but not a hobbyist/amateur. I totally appreciate people who share their DIY projects with the community, and lots of people do this on various forums. Basically this book should have just been a post on some forum and a github link. To put it into a self-published book is a shameless money grab. I wish I hadn't bought his Arduino Nano PI book in this same purchase. That is literally thinner than some takeout menus--review of that one to follow after I spent the 10 minutes it will take to read it. I would not recommend purchasing books from this author. ... show more
Reviewed in the United States on July 25, 2024 by Customer

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