EPE resistivity logger

[ivconic]

In process of making it.....

[ivconic]

Few steps to finish..

[ivconic]

PCB adapted to suit this specific enclosure. Also planned to use with 12V accu. so there is 7809 added on pcb too....

[aft_72005]

Hi ivconic
Seem as your other handmade. Very nice. Congregation
Please more inform afterwards complete it .
Specially test on the ground .
Best regards.

[ivconic]

Of course!

[zenit52]

Hi ivconic,

very nice work...!!!
Can we detect treasure under the ground by this device ...?

Best regards...

[ivconic]

Yes, of course. Do you know what "resistivity meter (and logger)" term stands for? You can find on internet numerous sites related to this subject.
With resistivity meter you can locate all possible anomalies beneath soil surface; water deposits,caves and cavities, metal deposits and ore deposits.
What you need is resistivity meter and good understanding of its working principles.
Cheers!

[ivconic]

Finished....

[ivconic]

BUT! While testing and experimenting with it, i noticed some strange behavior!? First of all i got 124Hz at output - not 137Hz as it should be??? Than "UP" command leaps from time to time....???
And than i founded out!

It is cleary stated in text (and later same in asm code) that quartz should be 3.6864Mhz. Yet...some stupid made mistake and printed 3.2768Mhz in a part list!

Inert and lazy as i am, i never payed detailed attention on that, and bought components according to that part list from a text!
So now i have wrong quartz installed on my device!
That explains ocassional crazy behavior! Problem solved (partially).
Now... damn shop is in another city. Also i am not sure they have 3.6864 to sell.
So i was wandering where to find that quartz? Any known application with it? Any domestic device? Any idea?

[ivconic]

Another problem is that i couldnt find 24LC256. Instead i have 24LC128 (dear friend send me recently). I put 24LC128 there.....yet i have doubts it will do the job. So...also was wandering is there any cheap&dirty trick to replace one 24LC256 with two 24LC128 on same board? If not, than i am pushed to order 24LC256 from another city...and wait for few days to receive it........I HATE WAITING! WAITING SUCKS!


P.S.

[Qiaozhi]

BUT! While testing and experimenting with it, i noticed some strange behavior!? First of all i got 124Hz at output - not 137Hz as it should be??? Than "UP" command leaps from time to time....???
And than i founded out!

It is cleary stated in text (and later same in asm code) that quartz should be 3.6864Mhz. Yet...some stupid made mistake and printed 3.2768Mhz in a part list!

Inert and lazy as i am, i never payed detailed attention on that, and bought components according to that part list from a text!
So now i have wrong quartz installed on my device!
That explains ocassional crazy behavior! Problem solved (partially).
Now... damn shop is in another city. Also i am not sure they have 3.6864 to sell.
So i was wandering where to find that quartz? Any known application with it? Any domestic device? Any idea?

I don't know if this will help you much, but Radio Spares have them in stock. There are 5 different ones available, and they all appear to be sightly different packages.

http://uk.rs-online.com/web/search/s...MHz#breadCrumb

[ivconic]

They have only one piece at stock!? By the time i somehow manage to contact them - that piece will be God knows where!?
Never mind. I will manage somehow. Those red faces i posted in previous posts were rather joke than me being really angry. Of course not. I like to keep certain pace in my posts here. What's plain text without spirit? It is my kind of humor.
I really beleive that damn 3.686 could be founded in some scrap electronic. Now i am pretty exhausted, tomorrow will dig huge scrap piles in my workshop. Maybe i will get lucky!
More important to me is question on eproms. Really...i never had simillar thoughts in the past on that subject; those are serial eproms? So...must be the way to replace one with other two??

[ivconic]

Same problem i had making EPE gradiometer. There are two 24LC256's there. But than i also put two 24LC128's and it worked pretty good. That gradiometer setup was more "tolerant" and left me to use those with half capacity less. 4000 samples instead 8000...if i remember good.
Now...this res logger is not that "tolerant"... Quite different memory organisation here...

[rael]

BUT! While testing and experimenting with it, i noticed some strange behavior!? First of all i got 124Hz at output - not 137Hz as it should be??? Than "UP" command leaps from time to time....???
And than i founded out!

It is cleary stated in text (and later same in asm code) that quartz should be 3.6864Mhz. Yet...some stupid made mistake and printed 3.2768Mhz in a part list!

Inert and lazy as i am, i never payed detailed attention on that, and bought components according to that part list from a text!
So now i have wrong quartz installed on my device!
That explains ocassional crazy behavior! Problem solved (partially).
Now... damn shop is in another city. Also i am not sure they have 3.6864 to sell.
So i was wandering where to find that quartz? Any known application with it? Any domestic device? Any idea?

Hi ivconic,


Sokobanja is close to Sofia. I have 3.6864Mhz xtal's.

[ivconic]

Excellent! If i can not find it in next few days, i will let you know.
Thanks!