Help to design a PCB for my PI design!

[1843]

Hi Qiaozhi,

The negative pin of battery is gnd(0V) in the new schematic. not -12V...
R23 should be ommited.
The PMOS is IRF9640.
Batt.setting, speaker and Backlight are changed as this.

Thanks

[Qiaozhi]

Hi Qiaozhi,

The negative pin of battery is gnd(0V) in the new schematic. not -12V...
R23 should be ommited.
The PMOS is IRF9640.
Batt.setting, speaker and Backlight are changed as this.

Thanks

In your schematic you have -12V electrically connected to 0V. Are you saying that you want these separated, and only connected at the starpoint near where the battery connection is made, or are you saying that you just want to rename the -12V net to 0V? Please can you make this clearer.

I will change the NMOS to a PMOS (forgot to do that) and remove R23.

[1843]

Simply I used two separate grounds(digital and analog) both connected to the negative pole of battery.(They're used for the PCBs without ground plane).
If you're going to use ground plane, simply rename the -12V to 0V.

Thanks

[miki73]

Hello to all!

Whots new in this project?
Too many great ideas.
I hope not stop to make some super machine.

Regards!

[Qiaozhi]

Hello to all!

Whots new in this project?
Too many great ideas.
I hope not stop to make some super machine.

Regards!

Updated schematic and PCB coming soon...
The data has not been posted yet due to other commitments.

[Qiaozhi]

PI-111 Version 2.0

As promised, here is the latest version of 1843's PI-111 detector:

[Unregistered]

u5 u7 opamp

u5 and u7 = ?ad797 ?ad844 ?lf347 ?ne5534 ? ? ? ? ?

[1843]

Hi Qiaozhi,
There are some errors... please see the changes needed to apply:
http://www.geotech1.com/forums/showp...&postcount=159
Thanks a lot!

Unregistered,
Any op-amp can be tried. I would use two NE5534's at first.

[Qiaozhi]

Version 2.1

Updated schematic and PCB.

[Qiaozhi]

Version 2.2

Here's the latest (and hopefully last) update for 1843's PI detector.

Changes made:

1. Swapped over S2 and S3 on schematic.
2. Added Cx across R10 as optional component.
3. Tidied up component placement / silk screen.

[Tinkerer]

PCB

This is most excellent work.
Could I convince you to design a PCB for a PI metal detector that discriminates?

Tinkerer

[Vermeer111]

hello i have on question,what dimensions have this pcb board thank you

[1843]

Great!

Hi All,

First of all I apperciate Qiaozhi for his time and efforts. I will send some special pre-programmed Atmega8's to him.


Now anyone can build and use this detector.

About the buttons:
S1. Decreases any parameter present on the LCD.
S2. Increases the parameter.
S3. Selects between various parameters.
S4. Tunes the PI in manual mode.
S5. Shows the battery status for 1 second.

About the coil:
Use a coil the same as the Hammerhad's for detecting coins and rings, and for nugget hunting make a fast coil as bbsailor describes in his article.
The sampling delay is adjustable from 7us to 25us, adjust to fit your coil.

Other settings are easy and you will know them as soon as once you work with.
The Cx is not used in this version. Maybe for later versions if I make.


Best regards,
1843

[Qiaozhi]

hello i have on question,what dimensions have this pcb board thank you

The board dimensions are 4" x 3.5".
This is slightly wider in the y direction than the Hammerhead PI RevD PCB, which is double-sided.

[Qiaozhi]

This is most excellent work.
Could I convince you to design a PCB for a PI metal detector that discriminates?

Tinkerer

I could ... but it may take a long time, due to other commitments.
If you email the design to me, I can pick at it during any spare moments.