'KROT2-XM' (mole), new project Xmega32

[smity]

Yes, that's correct.

[Ropcsika]

Yes, that's correct.

my krot 2XM Zero Adc Urx is about 1100mV and Rx error. Why?
Rx freq: 6816 Hz
Tx Freq: 8495 Hz

[smity]

Adc URX should be 0 mV. Voltage at 1 and 44 feet controller should be about 1.6V!

[Ropcsika]

Adc URX should be 0 mV. Voltage at 1 and 44 feet controller should be about 1.6V!

I Disconnect both coil and i shorted Rx and adjust the zero adc, .... 4mV. Voltage at 1 and 44 feet 1.675V. When i connect both coil Rx error etc...

[smity]

Error will show when the balance is greater than 1 volt. You "0" ADC is set correctly. Now try to balance sensor.

[Tepco]

Small update on KROT. I made “original” coil, 45T 0.55mm for TX, 2.2R resistance, 1.22mH, and 200T 0.2mm, measured 78R and 30.5mH for RX. Actual inductance values may vary somewhat, measured with hand made resonant LC meter. Detector autotuned it to 8086Hz, at 167mA TX current (I replaced R3 with 1R for tests with different coils). Voltage across coil is 17.6Vpp, can be adjusted using TX power control. Coil is balanced to 520mV, then coil balance routine reduced it to 99mV. Initially detector was very unstable, beeping all the time, but later, after all adjustments done it started to perform properly. With unshielded coil, unshielded cable and powered from PSU, not battery, tested indoor, at Gain 1 setting completely quiet, at Gain 2 occasionally beeps from time to time. I don’t expect any stability issue with finished detector (shield, cable, metal box, battery etc in place). This will be completed later, (winter time), first i will prepare few more coils and finish them all at once (need to mix epoxy at least 4 times in the process) Also update to KROT3, not for multifrequency, but more for “multicoil” operation (different coils at different frequencies).


Perfect project, probably pointless to build anything else VLF.

[Ropcsika]

Between the Gnd and Vdd(3.3v) there is 0.3ohm. It's correct?

[WM6]

Also update to KROT3, not for multifrequency, but more for “multicoil” operation (different coils at different frequencies).


Perfect project, probably pointless to build anything else VLF.

You mean KROT_2 to update to work as multifrequency KROT_3 or "update" to new project KROT_3? Can you explain your solution a little more detailed?

[Ropcsika]

If i connect the TX coil rises to 2200 mv.
I move it the coil but do not go under 1100mV....

[Qiaozhi]

Video from Geo

Here's the video from Geo:

06012014005.mp4.zip

[Geo]

Here's the video from Geo:

[ATTACH]27989[/ATTACH]

Thank you Qiaozhi.
On the attached file you can see (not so clear) and hear the erratic signals who has my KROT2. Erratic signals are with ... and without the search coil..

[WM6]

Some corrections in KROT2 modes ans setting procedures:

[Geo]

Thanks WM6.

At "" Rx error ...."appear if coil balance is worse (more than) 1000 mV""" you must note that 1000mv must be after the out of MCP601.
Preamplifier (mcp601) has a gain near to 100 so the signal of Rx coil must be less than 10mv if we don't like to see the message Rx ERROR .



Regards

[smity]

It seems to me that you have not figured out the simplest things ... Set the "0" ADC, then pinch the balance, and then do the test ...

[Geo]

It seems to me that you have not figured out the simplest things ... Set the "0" ADC, then pinch the balance, and then do the test ...

All are ok except the erratic signals. I wait for the new uC and programmer so to replace it. I am sure that uC has problem as had and the MCP601.