Epe pic magnetometer

[joco000]

I didnt build this yet, but have plan to do.

Try this

take uC out, put in on bread board and connect only supply voltages, quartz, switches and LED. ( run withot sensors, LCD, EEPROM, MAX 232... )
Insted of sensors use 2 simple square oscilator. ( http://www.seekic.com/forum/22_circu...SCILLATOR.html)

push record switch and check record LED

I think that way you can see if code is running ok.

Check Xtal also.

[lazzy]

hi joco000

sorry, but what stands 'uC' for?

I have thought about the crystal and replaced it firsthand, but same unstable behaviour...

I remember testing the pcb with only the pic & lcd on, every other ic & sensors out, but same behaviour (I have to redo that though...). I may give a try the test on breadboard with your suggestions...

regards, lazzy

[joco000]

uC = microcontroler = pic

take a look at power supply. Bad supply can cause a lot of strange problems.

[Krzysztof]

Hi Lazzy.
The cure for the troubles is a good design, even a stopgap.
MAG longer deserves to make a tutorial to PCB board.
Good soldering, stand under the PIC microcontroller, check the continuity of paths!
Each pin on the PIC must be somewhere overhead (resistor to Vcc), a long loose wires as an antenna are doing - nothing good.
The idea of an external signal instead of the sensor is amazing - you can avoid the instability of the most important place!
With the source program (Maggy07.asm) you can program and test the PIC by piece, each segment separately.
Such a procedure is indicated for each project, when switching on the light does not light.
Best regards Chris.

[lazzy]

EPE Magnetometer Sensor Circuit Correction!

Hi Krzysztof

thanks for the tips - I agree that good construction and careful testing is vital for a project to be succesful.

BTW, I would hereby like to quote an important post (reply to my mag problem post) from a related forum at the THunting website, concerning Sensors' connections - it refers to EPE magazine issues of Sep. and Nov. 2004:

>....
>In the mean time, here's something from the September issue with a circuit correction.
>
>"In the Sept. 04 issue (P.623) we advised that the correct number for Speake & Co.,
>the suppliers of the flux sensors, should be 01600 780150 and not as printed. In the
>Nov. 2004 issue we said that on Page 474 Fig 6, the FGM6 legends for Sig Out and GND
>have been transposed. GND is pin 2 and SIG OUT ispin 3. The wiring connections to the
>PCB should be transposed."
>
>I really can't see that being the problem but it will impede proper operation later for certain.

Moreover, an important addition is suggested as to make the PIC function more stable:

>I suggest that you add a 30k resistor between pin 40 on the PIC chip and ground. You
>should be able to do that easily on TB1 using alligator clip leads to test it. Or just wrap it
>round the posts and crimp the leads to hold it in place. If it works, solder the resistor to
>the back of the PC board.
>
>The PIC chip can become unstable in operation if the data in pin is left floating during
>operation. Normally, a 22k resistor in series with pin 40 and a 10k resistor to ground on
>the input side of the resistor is added for stability.

the post can be seen at: http://www.thunting.com/smf/index.ph...html#msg140072

I hope that this helps everyone concerned with this epe project.

regards, lazzy

[tzanisgiannis]

Hi,

Did somebody try to build Jon Fick’s data logger?
C source is included. Found at:
http://www.vermontficks.org/datalogd.htm
http://www.vermontficks.org/datalogs.gif
http://www.vermontficks.org/datalog5c.htm

Yes, i already made two of them, and they work fine, both inputs (5V and 14V) works fine.
The only ''hot point'' to this litlle project is to include the ''johsinc.h'' ccs file with the the main code during compilation.

Best regards
Giannis

Thessaloniki,Greece.

[Dinkydick]

Tzanisgiannis

Where can I obtain a copy of "johsinc.h" code?

Dinkydick

[tzanisgiannis]

Jon Fick Data Logger

Yes, i did it (Jon Fick Data Logger). I allready build three of them, and they are working fine, both inputs(5V & 14V) are working O.K
The litlle ''secret'' for proper work is to include the jonsinc.h file with the main code, for compilation.

Regards.
Giannis
Thessaloniki-Greece.



Did somebody try to build Jon Fick’s data logger?
C source is included. Found at:
http://www.vermontficks.org/datalogd.htm
http://www.vermontficks.org/datalogs.gif
http://www.vermontficks.org/datalog5c.htm[/quote]

[syed ayub basha]

EPE project PLZ

PLZ send full EPE pic magnetometer & data loger2 or (hex file) project for me
[email protected]
[email protected]

[rael]

johsinc.h

""jonsinc.h" file.

[rael]

Jon Fick Data Logger

12 bit ADC /PIC18F2523/ modification.
Jonsinc.h is included in the source file.

[Dinkydick]

Thanks you guys

[syed ayub basha]

EPE PROJEC PLZ

I WANT EPE MAGNETOMETER PROJECT

PLZ send full EPE pic magnetometer & data loger2 project for me
[email protected]
[email protected]

[tzanisgiannis]

Data Logger

Here is the ''johsinc.h'' zipped file. You must include it in the data logger project to the compiler and then run the ''build'' or ''compile'', so you can have the output file(HEX) for programming the 16F876.


Best regards

Giannis
Thessaloniki,Greece

[joco000]

i am building epe pic gradiometer.

if i understand corect, output from PIC or at PC input we get difference of 2 sensors.
if they are not perfectly aligned we get some value bigger than 0.
if we send this values to some visualisation program, we could colour different values with different colours.

i dont see the problem here why is missaligning such problem. If there is difference between 2 sensors 300 hz, ( when no anomalies around) this point will be gray colour, when we move close to anomalies we get bigger difference...and it will colour from yellow to red colour.

of course this could be done also with PIC programm ( digitaly subtraction), but if we put CSV to some visualization program i think we can get nice picture. we can set up grey colour for 0 to 300 hz.

please correct me if i am wrong

regards,
joe