Carl's Gradiometer pin2

[Geo]

Hi.
Last time i "play" with the gradiometer that designed by Carl. I want to connect the pin2 of the SCL007 with a led so to "see" who sensor detects any object as Carl wrote..
"The SCL007 also has a “sign” bit
which can tell us which of the two sensors is detecting an increase in the magnetic field, making the total output a true offset binary
9-bit word. We are not particularly concerned with the sign bit, although it could be used to determine which sensor is closer to the target".

BUT, when i connect the oscilloscope with pin2 i see that pin 2 is going "on" every time that the magnetic field of a sensor is increasing. This is happening with both sensors, so how i can determine who sensor detect an increase of the magnetic field???

Regards

[Krzysztof]

Adjustment

Hi Geo.
Procedure:
1. table settings, horizontal gradiometer, the direction of N-S.
2. from S with the tool slowly 50cm to 10cm metal.
3. increases the signal "+"
4. as in point. 2, but with the North.
5. signal grows in me "-"
In this way, the signal grows at least 100%. In this way, you can also specify sensitivity.
Use metal tweezers, stainless steel.
In the lower operating position sensor signal is always greater (the impact of land) from the top.
It is good to give the project a more sensitive sensor to GND.
Best regards, Chris.

[Geo]

[quote = Krzysztof? 108898] Hi Geo.
Procedure:
1. table settings, horizontal gradiometer, the direction of N-S.
2. from S with the tool slowly 50cm to 10cm metal.
3. increases the signal "+"
4. as in point. 2, but with the North.
5. signal grows in me "-"
In this way, the signal grows at least 100%. In this way, you can also specify sensitivity.
Use metal tweezers, stainless steel.
In the lower operating position sensor signal is always greater (the impact of land) from the top.
It is good to give the project a more sensitive sensor to GND.
Best regards, Chris.
[/ Quote]

Hi Chris.
Sorry for late answer. At my test, Pin2 goes on (+) every time. This is the reason that i wrote here. A problem is that i make the test in the lab, maybe out, free of nay metals, the results to be different. Now the weather is very bad. When it become better i will go out to test it and i will inform you
Regards

[Krzysztof]

Hi Geo.
II, measure the value digitally.
The frequency of FGM varies according to the curve of "S". She has a different slope (sensitivity) in each probe (30%).
I have a test bench on the desk in my room. When the probe is always in the same place and direction, approaching metal in the same way, the results have repeatable. Although around the computer and monitor, and the underside of the keyboard.
In the field, I set only in a common axis gradiometer ready for a minimum of indications in the positions west / est. And no metal on him.
Best regards Chris.