Epe pic magnetometer

[SimonS]

I realized another schematic (the Mag-Shield on fgsensors.com, website of manufacturer ) and I tried with a single sensor far from any electromagnetic noise. Same problem, unstable frequency reading. So the sensors that I received have a problem. Thank you.

Hi
Can you send me sensors back (address in on box), so I will check it and resend you back new one. You can also send me logger so I can check all.

[amitech1982]

I realized another schematic (the Mag-Shield on fgsensors.com, website of manufacturer ) and I tried with a single sensor far from any electromagnetic noise. Same problem, unstable frequency reading. So the sensors that I received have a problem. Thank you.

[Suhoj57]

the complete project schema.

Thank you ! Who is the orbit ?I'm a beginner and you are cheeky or kidding.

[Orbit]

the complete project schema.

[amitech1982]

Can the scheme for EPE ?

the complete project schema.

[Suhoj57]

Can the scheme for EPE ?

[waltr]

Thanks. The audio card of the PC is limited to the band of 20khz.

The other option is a USB Scope. Pico Scope is one that is available plus some others.

[amitech1982]

Maybe the PC's audio input can be used. Search internet for methods.

Thanks. The audio card of the PC is limited to the band of 20khz.

[waltr]

Unfortunately, I do not have an oscilloscope to check. Do you have another idea to check the sensor output? I can build an oscilloscope on Computer?

Maybe the PC's audio input can be used. Search internet for methods.

[amitech1982]

I tried 74hc14 schmitt trigger and unfortunately the same issues, have not changed anything ... either microcontroller firmware is not compatible with the sensors or sensors have a problem ... but strange that there are several projects used these sensors and never talk about these problems ...Mag-Schield for exemple On the fgsensors.com site.

[amitech1982]

Have you looked at the signal with an O'scope?
It should have clean square waves without jitter.

Unfortunately, I do not have an oscilloscope to check. Do you have another idea to check the sensor output? I can build an oscilloscope on Computer?

[waltr]

Hello.
I made an LC filter (L = 6.8uH and C = 560pF) as indicated in the article, all close to 4013. I then attached to the device a single sensor with 3 short threads 15cm in length, but unfortunately, the problem persists, and the frequency reading is still unstable ... I do not know where the problem is.

Have you looked at the signal with an O'scope?
It should have clean square waves without jitter.

[amitech1982]

For FG-3+ no need RC filter. It is integrated inside sensor.
For my logger I did add also schmid trigger on input. Result are much better

I will try with a Schmitt trigger...

[amitech1982]

Hello.
I made an LC filter (L = 6.8uH and C = 560pF) as indicated in the article, all close to 4013. I then attached to the device a single sensor with 3 short threads 15cm in length, but unfortunately, the problem persists, and the frequency reading is still unstable ... I do not know where the problem is.

[SimonS]

For FG-3+ no need RC filter. It is integrated inside sensor.
For my logger I did add also schmid trigger on input. Result are much better