2nd Chance PI

[Arionas]

http://chomikuj.pl/dantech/2nd+ChancePI

Coil
http://chomikuj.pl/dantech/2nd+ChancePI/Coil


Firmware
http://chomikuj.pl/dantech/2nd+ChancePI/Firmware


Fusebits
http://chomikuj.pl/dantech/2nd+ChancePI/Fusebits


Pcb
http://chomikuj.pl/dantech/2nd+ChancePI/PCB


Schematics
http://chomikuj.pl/dantech/2nd+ChancePI/Schematics
Project development 2nd ChancePI: PaWol / Poland / Lower Silesia

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I do not agree to distribute my version of the program in any form of commercial (ie. Sets of PCB and ATmega).

I do not guarantee operation of the project - a project eksperymentaly. Use it on the principle "is what it is."

They use my version and solutions on their own and sole responsibility.

The software has a lock on the 100 startups limiting uncontrolled commerce solution - to be reprogramować processor.

At the moment, the priority is to continue to use ATmega8 processor and versions for ATmega328 are not tested at all.

I still have reservations about the action version ATmega328.

Versions for ATmega8 processor will be published only when the conditions allow the already depleting resources.

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I emphasize that each of my version of the software has its roots in a project called ChancePI / AndyF



v001
The code has been virtually the entire rewritten, changed timings, required some modifications hardware to work properly
Therefore, the project takes the name of the 2nd ChancePI and numbering of versions starts with v001

It is necessary to remove the existing project ChancePI the entire circuit D6 / Q5 / Q6 / Q9 and inserting a jumper instead of diodes D4
Tests have shown that the presence of the indicated elements in the draft 2nd ChancePI adversely affect his work.

V002
- Change in the reinitiation filters after a change in menu opóźnienień
- Change frequency tones VDI more distinguishable. 500Hz for ferrous and non-ferrous metals for 1,6kHz
- Repair process works by masking kinds of metals
- Repair sounds VDI on the border of ferrous and non-ferrous

V003 and v300b
- Modification algorithms masking sounds VDI
- Optimization of time between the sounds of VDI and VDI indicator
- Change frequency tones VDI more distinguishable and improves the overall listening. 500Hz to 1kHz for iron and non-ferrous metals (harmonic / octave)
- Sound distortion is muted masked areas VDI. Now is heard only in the areas odmaskowanych
- Version of the V300 has a timing 200Hz / 120US a version v300b timing is 400Hz / 120US

Support for ATmega8 is terminated due to the lack of free flash memory !!!

V004
- Adding profiles timing selected from the menu
- Adding the functionality of automatic measurement Delays Main samples of natural delay coil
The measurement is indicative of an accuracy of +/- 1us. Upon activation of the machine must be manually verify it in the menu and confirm OK
The machine is now in the menu delay the main sample position 0us.
- Elimination of a separate memory mask signal mode without masking of metals and metal masking mode

V005
- Optimizing the functionality of automatic measurement of the delay coil
- Reduce the amount of time profiles. Tests have proven of little large amount of modes and its effect on the stability of VDI
- Time profiles are now identical pulse width and changes only frequencies in the range 100-400Hz. Changes to energy consumption

Warning! The measurement coil requires its elevation into the air away from metal objects.

v006
- Change the resolution power of sound depending on the signal strength at 4 degrees
- Repair of the lack of lighting the first segment of the signal strength

V007
- Adding to the amount of the adjustment menu levels in the intensity of sound, ie. 1.2 and 4, depending on the signal level.
The default is 1 level.
- Optimization of time between the sounds of VDI and VDI indicator

[dantech]

I see I have made mistake in the version number v003. Sometimes I call it v300 by mistake. I shall correct it soon

[dantech]

Faults in the changelog are corrected

[dantech]

v008

[Wahyu]

hello dantech,

i see schematic and lay, my question is Q6 , Q5 , Q9 , its not exist at schematic?

[dantech]

No , it did not work in fact so entire circuit and software support is removed

[dantech]

v009 available

[Wahyu]

v009 nofile download?

[dantech]

You have looked at file when v009 was updated onto v010

[6666]

Schematics
http://chomikuj.pl/dantech/2nd+ChancePI/Schematics
Project development 2nd ChancePI: PaWol / Poland / Lower Silesia

Dantech , reply #35 in this thread is a bit confusing, should we still be useing your modified schematic as listed in the quoted link above ?

And does your latest software work with the original chance schematic or only your modified schematic.

[dantech]

V012 released

Q6 circuit and entire Q6 solution was a bit "fictious" in the original Chance PI. It did not work properly in fact and
did nothing usefull instead of additional and unwanted 100mA power drain
So I do not drive Q6 in the 2nd Chance and I have changed the way of coil driving.
For instance original Q6 solution drains 180mA but my solution drains 80mA.
Is there any difference ?
Like I said Q6 solution was not succesfull
Should not be difference if Q6 circuit is placed or removed from PCB when using my software.
In my software Q6 is driven as inactive whole time. fhe ICL7660/LT1054
is enabled whole time also.

So, simplifying, my release should be backward compatible. I do not test it at all.
For purity reasons I have removed Q6 circuit from my pcb completly and new schematic diagram and pcb project do not inculde one also.

[dantech]

By the way,a few things good to know about 2nd Chance PI:
- OK button pressed whilst starting restores default settings
- Menu button pressed whilst starting goes direcly into menu without battery test.
It can be usefull when you set battery U min level higher than voltage battery you have.
Normally you will see "low battery" prompt at start in that case. So use this method.
- Default settings are proper in may case. Everyone should test the device and enter own settings

[dantech]

https://youtu.be/PDnZ3_BuyM0

Quick metal discrimination test

[Wahyu]

Hello dantech

i see schematic NE5534 have LC DC filter, capacitor before inductor for DC filter?

capacitor->inductor , or inductor -> capacitor

[eclipse]

Pin3 of the preamp must be connected to GND and yeah that LC filter doesn't seems correctly connected.