Originally posted by mermelado
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Originally posted by surfdetector View PostThe salinity when constantly submerged in the salt water is uniform as opposed to swinging in and then out of the surf.
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Just got the book and typing in the sketch. The ISR seems to be missing a line of code above the switch statement, but not 100% certain. I just see a bracket pairing mismatch. Anyone have any ideas? Is there a repository that contains the code? Not against typing it in, but do not want it to be harder than it should be.
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https://www.geotech1.com/forums/show...hed-March-2021
this link is the thread with all the files.
This thread is for questions and discussions the info you are looking for is in the technical papers and books section.
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Originally posted by jhughes1010 View PostJust got the book and typing in the sketch. The ISR seems to be missing a line of code above the switch statement, but not 100% certain. I just see a bracket pairing mismatch. Anyone have any ideas? Is there a repository that contains the code? Not against typing it in, but do not want it to be harder than it should be.
It appears that you have spotted an error at the top of page 23. The missing line is "ISR(TIMER1_OVF_vect) {".
I'll create an errata in the above link.
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Hi George and all members!
I just received yesterday the two books: Arduino nano PI metal detector project, and The Voodoo project. What an exciting journey is waiting for me after some years away from electronics!!
Thank you for sharing this knowledge!
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Hi experts,
I finished reading the book, ordered my PCB, and about to order the missing components. However I have 3 questions:
1-I cant find the darlington MPSA13, and found out that a BC516 can replace it with no issues. Can somebody please confirm or went through the same issue?
2-Is it mandatory to have Sample delay and Threshold pots as multiturns or normal pots would work fine?
3- I am thinking of powering up the detector from a 12v powerbank instead of building the charger (as an easy and more practical way) did anyone try this before?
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Originally posted by Rzouga View PostHi experts,
I finished reading the book, ordered my PCB, and about to order the missing components. However I have 3 questions:
1-I cant find the darlington MPSA13, and found out that a BC516 can replace it with no issues. Can somebody please confirm or went through the same issue?
2-Is it mandatory to have Sample delay and Threshold pots as multiturns or normal pots would work fine?
3- I am thinking of powering up the detector from a 12v powerbank instead of building the charger (as an easy and more practical way) did anyone try this before?- BC516 is a PNP Darlington, The MPSA13 is an NPN
- The sample Delay and Threshold are normal single turn pots
- You can certainly power from a 12V pack, the charging circuit is not necessary
I did a video set on the Arduino Nano build here, you might find it helpful:
https://youtube.com/playlist?list=PL...vygh0x9WRf4jag
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Originally posted by surfdetector View Post- BC516 is a PNP Darlington, The MPSA13 is an NPN
- The sample Delay and Threshold are normal single turn pots
- You can certainly power from a 12V pack, the charging circuit is not necessary
I did a video set on the Arduino Nano build here, you might find it helpful:
https://youtube.com/playlist?list=PL...vygh0x9WRf4jag
Hi surfdetector,
Thank you for the quick answer
My bad, that was my mistake I meant bc517 which is also an NPN darlington, It is a bit difficult to find an equivalent to the MPSA13, if you know any please be my guest.
I have to say that I knew about the book and about this forum thanks to you and your videos (I think I watched the 4 of them more than 3 times or so)
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I have used:- MPSA14, MPSA12, 2SC982, 2N6426, MPSW45, ECG46, 2SC982, 2N5525, 2N5306, 2N6427, 2SC1472, BC517, 2N7051, 2N7051 in place of the MPSA13 on other detectors with no issues. Also, I power my ANPI's with 3 x 18650 batteries and just replace the batteries when they delete,,,they last me about 8 hours or so. Regards, Marty.
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