MMA8453QT 3 Axis Accelerometer IC

[Sean_Goddard]

I have an UNOPENED tray of these (250). If anyone wants one to experiment with please let me know. If enough of you would like to buy one at £2.50 each, I will cut the tray open.

I'm thinking something like measuring search head sweep speed then changing filter parameters to maintain stable performance.

[moodz]

I have an UNOPENED tray of these (250). If anyone wants one to experiment with please let me know. If enough of you would like to buy one at £2.50 each, I will cut the tray open.

I'm thinking something like measuring search head sweep speed then changing filter parameters to maintain stable performance.

Very nice .. but if I live to be 110 I still wont have time to play with all the toys I already have !

[Sean_Goddard]

ONLY 110? You're not doing it right

[ivconic]

Very nice .. but if I live to be 110 I still wont have time to play with all the toys I already have !

I thought the same thing the other day when I saw some new toys on Aliexpress!
3 lives would not be enough for me to collect it all and find time to play with it!
Already now in my house, in the attic, in the basement, there is no more room than boxes full of my "waste" (my wife's favorite term)!
When I die one day, my folks will just throw it all away! Arghhh!

[profesor]

I thought the same thing the other day when I saw some new toys on Aliexpress!
3 lives would not be enough for me to collect it all and find time to play with it!
Already now in my house, in the attic, in the basement, there is no more room than boxes full of my "waste" (my wife's favorite term)!
When I die one day, my folks will just throw it all away! Arghhh!

I think many people experience the same fear.

[ivconic]

Even though the wife has her own job and salary... I'm still "very good" when it comes to bringing money into the house.
And that if there is no such "waste" in the boxes; there would be no money.
In those boxes are hours, weeks, months and years of my studies, work, experiments... the whole productive part of my life.
I remember Eric Foster and his short couple of posts on these topics.
The genius had a lot of equipment and instruments. A collection. A small museum should have been made of it.
Because that's history. It is the basis of an entire part of an industry.
What can we say about Fisher?
Charles Garrett... Dave Johnson?
George Payne... many others! (don't get me wrong, I'm not so ambitious that I dare to put myself in the list of such people).
I guess we all have a similar situation and similar "better halves"...
When a pile of money is on the table; we are all the most beautiful, the sexiest, the most powerful... men in the lives of our wives!
But when we need to give us some space in the house... then the term "unnecessary waste" is often used...
And our children? Everything else is important to them, except what is in those boxes. In the end, it usually ends up in the trash.
That's why I respect this forum even more.
What remains on this forum is the only thing that will remain after me.
Not a great picture, because I was wrong a lot... but it's better than nothing.

[JoyJo]

And how can an accelerometer be used for a metal detector?

[Skippy]

Put it in the search-coil ( like the Minelab CTX3030, and most probably the Manticore ). Then you know the sweep speed and direction. The direction is useful if you're wanting to display the results of a sweep on an LCD screen. You want to display it left-to-right always, so you have to know if it's a right-to-left sweep.
And detectors use filters to help emphasise the rise and fall of the target signal, to seperate it from the background 'ground' signal. Some machines ( Whites V3, for example ) let you choose the filter response, to suit you sweep speed, and other variables, like coil size. Using an accelerometer lets the machine choose the best filter characteristics. Continuously varying it should also be possible, to cater for slowing at the end of each sweep, for example.
The vertical axis may be useful when doing 'pumping' ground grab.

[Carl-NC]

See this patent: US9207315B1.pdf

[moodz]

See this patent: [ATTACH]n424383[/ATTACH]

...and who was the patent attorney because they did not do a good job of discovery in regard to prior art

should have at least been referenced.

see patent US7532127B2


https://patentimages.storage.googlea.../US7532127.pdf

[Carl-NC]

It's funny, I wrote the White's patent before I knew about the L3 patent. We filed the patent, then the examiner did a prior art search and came up with the L3 patent. After I read it, I recommended dropping the patent and shortly afterwards I left White's. I was very surprised they got it issued. And the L3 patent is referenced in the White's patent. After Garrett bought White's, they let the patent lapse.

[ivconic]

I'm speechless!