Voodoo Main Discussion

[waltr]

Thanks Mr. Waltr, I have a problem with the power supply, at PL 15 I don't have +5 volts, instead on PL 14 I have -5,

-5V at TP14 is correct.
Is the Clock out of the PIC processor working? Check with O'scope at TP9.

looking at the diagram on the book I noticed that the two ground of the two stabilizers should both be connected to the 0 volts, instead there is no continuity between them. Thanks for who can answer.

No idea what you mean about two grounds???
Give chip designation and pin number.
Example: U7 pin 1 of the 79L05

If two pin that should both connect to "0V" are not then re-check your soldering.
This assumes you are using a known good PCB. Did you buy the PCB from Silverdog or make your own?

[dgm]

Teknetics coil Omega 8000

Hi I wanted to ask the Gurus of the Forum, I have a Teknetics concentric coil for Omega 8000, with the TX 0.874 mH coil and the rx 8.74mH coil, can I use it for tests on the MD Voodoo? Thank you for your answer.

[sbalio1]

Hi friends can ennyone here help i have pic18f452 . I ask if i can use it .

[Qiaozhi]

[ATTACH]55555[/ATTACH]Hi I wanted to ask the Gurus of the Forum, I have a Teknetics concentric coil for Omega 8000, with the TX 0.874 mH coil and the rx 8.74mH coil, can I use it for tests on the MD Voodoo? Thank you for your answer.

The TX inductance is on the high side at 874uH, but still lower than the Troy (1.12mH) and Tesoro (982uH) coils that were tested, so it should be OK.
Have a look at Table 6-1 on page 75 for a comparison.

[Qiaozhi]

Hi friends can ennyone here help i have pic18f452 . I ask if i can use it .

Theoretically the answer is yes, but be aware that the CONFIG settings will need changing and there are other differences such as the ADC.
This means that you will have to modify and recompile the source code. The easiest solution is to simply order the correct PIC.

[dgm]

Hello, I have a question regarding the damping resistor to match the tx winding for the mode P.I.. I wanted to test with a coil in my possession
with tx 0.874 mh.

[surfdetector]

Hello, I have a question regarding the damping resistor to match the tx winding for the mode P.I.. I wanted to test with a coil in my possession
with tx 0.874 mh.

You need to attach your coil along with a damping resistor jig and then you can figure out the correct value by observing your oscilloscope.

[Qiaozhi]

Hello, I have a question regarding the damping resistor to match the tx winding for the mode P.I.. I wanted to test with a coil in my possession
with tx 0.874 mh.

Watch this ->
https://www.youtube.com/watch?v=CrJ5...7Rd5MniTrONUBI

[dgm]

Thanks Mr. Georg and Mr. Surfdetector

[yatahaze323]

I've been watching this thread since it was posted, do you think we could get a Voodoo section in the Projects area of Geotech1 forum? It would be nice to have a place beside this one thread where individuals could post their builds and ask questions. Thanks!

[Qiaozhi]

I've been watching this thread since it was posted, do you think we could get a Voodoo section in the Projects area of Geotech1 forum? It would be nice to have a place beside this one thread where individuals could post their builds and ask questions. Thanks!

My thoughts on this request is that it would cause confusion by fragmenting information into two separate places. I understand that the original thread is becoming quite long, but at least you know where the information is located. If there is anything of particular interest, I tend to update post #1 with the relevant data, or post a link to the start of the discussion.

If you would like to share your own build with the other Geotech denizens, there is nothing to stop you creating a dedicated thread in the Tech Forum.
Just my personal view ...

[yatahaze323]

Ok, I understand where you're coming from.

I do have a question about the Arduino nano version of the Voodoo detector. In the pdf for the nano version you mentioned that the nano had issues with the meter due to a lack of ram.

I noticed that arduino has several newer versions of the nano that have much more ram and run at higher clock speeds. I was interested in using the Arduino Nano 33 ble https://store.arduino.cc/usa/nano-33-ble-with-headers

The pin outs and board size appears to be the similar to the original nano, I checked the .ino file and the pins used there match the pins on the nano 33 ble so it would fit the add on board that you created and match the code for the pins.

Besides adjusting the power to 3.3v for the Nano 33 ble, is there anything in the code that would need to be adjusted for the difference in clock speed?

Also could you post an ino file or provide the code for the meter that had trouble running on the nano?

Thank you for your help!

[Qiaozhi]

I do have a question about the Arduino nano version of the Voodoo detector. In the pdf for the nano version you mentioned that the nano had issues with the meter due to a lack of ram.

The lack of RAM issue was only when using buffering for the OLED. Unfortunately I didn't keep that version of the code as I was just experimenting with the OLED and trying to figure out the correct configuration for the AZ Delivery OLED constructor. If I recall correctly, you have to use the U8g2 library (line #18 ) and enable full buffering in the constructor (line #21).

I noticed that arduino has several newer versions of the nano that have much more ram and run at higher clock speeds. I was interested in using the Arduino Nano 33 ble https://store.arduino.cc/usa/nano-33-ble-with-headers

The pin outs and board size appears to be the similar to the original nano, I checked the .ino file and the pins used there match the pins on the nano 33 ble so it would fit the add on board that you created and match the code for the pins.

Besides adjusting the power to 3.3v for the Nano 33 ble, is there anything in the code that would need to be adjusted for the difference in clock speed?

I was nearly tempted recently to purchase a couple of Nano 33 BLEs, but ended up buying some HC-05 Bluetooth modules instead as I already have the Nanos.
The only alteration to the code should be changing the clockCycle on line #47 (see attached .ino)

Also could you post an ino file or provide the code for the meter that had trouble running on the nano?

Thank you for your help!

I have attached the non-buffered OLED meter version, as that's all I have. This version does run on the standard Nano but the meter is a bit sluggish.

[yatahaze323]

Great, thanks for the info and the ino file!

[dgm]

Good evening, I wanted to ask the gurus of the Forum, after having assembled the circuit of the Voodoo Project, I found the problem highlighted by Mr. Nixie post 1477, where he had reported that he did not have +5 volts on pin 15, and after removing the 20k r48 resistor, +5 volts magically appeared. From your suggestions he had been told to replace the LT1054, perhaps it was a remarked 7660. I have tried three LT1054s bought from different suppliers, but nothing. Please help me solve this question.
Thanks again for your patience.