PICKINI V4 - an easy to build, self adjusting PI detector

[württemberger]

Thats not all (C15 inverted). Lock the Photo, there is another mistake.

[nick holas]

Hi all
Hi Bernard
Hi toros
Yes you re right c15 is inverted!!!!!!! +to pin 11 of the pic
I ve corrected it and i will post the good one soon
Have Nice day

[Sean_Goddard]

STAY CLEAR fo the eBay pickit 3's I bought one they self erase for fun and require constant reprogramming with a PICKIT 2!! Go figure!

Best buy GENUINE Pickit 2 and not have the hassles.

[BC547]

what is depth of detection of 50 cm iron plate diameter with 50 cm coil diameter?and how much is sensitive this detector to the gold?

These are 2 totally different requirements.
It is much easier to detect the iron plate than to detect fine gold.
You will need 2 different coils for this.
For gold, depending on the size, you will need a relatively small coil with very little capacitance ( a "fast" coil ) - look in the coil specific section here, people tend to use insulated litze wire or even coax cable for this (in the shell of a very small nut: separation = less capacitance between windings = faster...).
For the large iron target, the 50 cm coil should give you enough depth to break your back while digging.
With a 25 cm coil I was able to detect an iron petanque ball ( diameter 80 mm ) at 1 meter deep in sand ground. That is the moment I thought I had found an old cannon ball...
In general, PI detectors like to detect iron.

[Toros]

Yes,
C15 is installed incorrectly on board. Must be reversed and + be to pin 11 of the processor.

[württemberger]

hi all
hi bernard
i ve made little change to fit the resistor 0805 smd foot print,and adapt condensator foot print too,corrected the pickit header (we will just have to put the pickit on the pcb and burning progr!!!)
i ve tell to microchip to send me some pic16f1824 smd sample so now i m waiting for and bought some lm318 soic too (but in aliexpress so i have to wait a looooooong time !!!)
i havent added a 1µf cap near 7805 (will do it soon)
i have made an excel file of all the component we need to do pikini ,we have just to print it now (i join it with my pcb revision)
have nice day

There is something wrong in the SMD-Layout...
Look the Part for the Speaker (Pic Pin11 - C15 - R16+R17 - Speaker)

[mohammadreza1100]

Hello again bernard.what is depth of detection of 50 cm iron plate diameter with 50 cm coil diameter?and how much is sensitive this detector to the gold?
Thank u.

[BC547]

please help me about coil sprcification such as resistanse value and the inductive capacitance value.

A simple bundle coil - 27 turns insulated litze wire or magnet wire 20 cm diameter is about 300 microHenry. You can use the excellent coil calculator available here on the forum.
Also check out the coil specific forum - all coil types described for e.g. surfPI are also applicable here on this Pickini V4.

Here is some information on coil construction for Pickini V3, which uses an identical coil as this V4:
http://users.telenet.be/willaert/MD/pickini/pickini_en/V3/coil.html

[mohammadreza1100]

Hi mr bernard.please help me about coil sprcification such as resistanse value and the inductive capacitance value.
Thank u

[nick holas]

little changes

hi all
hi bernard
i ve made little change to fit the resistor 0805 smd foot print,and adapt condensator foot print too,corrected the pickit header (we will just have to put the pickit on the pcb and burning progr!!!)
i ve tell to microchip to send me some pic16f1824 smd sample so now i m waiting for and bought some lm318 soic too (but in aliexpress so i have to wait a looooooong time !!!)
i havent added a 1µf cap near 7805 (will do it soon)
i have made an excel file of all the component we need to do pikini ,we have just to print it now (i join it with my pcb revision)
have nice day

[BC547]

i saw too i ve forgotten the 470µf capacitor near 7805 ( couldn't it be really forgotten ,is it really necessary???)

According to the datasheet - http://www.ti.com/lit/ds/symlink/lm78l05.pdf you need 330 µF at the input.
There is already the 2200µF directly on the battery input, but not located closely to the 5V regulator.
I assume you could safely omit the 470µF or replace it with some SMD smaller capacitor ( 1 - 10 µF )

[nick holas]

hi all
hi bernard
hi bernt
i made some little changes,named components (2k2,1k,4p7) add a pickit connector that can be made by shunt (so you have to delete tracks before) or by double sided pcb,i saw too i ve forgotten the 470µf capacitor near 7805 ( couldn't it be really forgotten ,is it really necessary???),i named output (threshold,pinpoint etc..)
bernt beware!!!! i m not sure of the electrolytic capacitor and resistor footprint check them before etching (at first it was just for fun for me!!) i have not the habit with smd component
for better understanding about the pcb look this with photo vue tool
thanks all
i m waiting for your reply

[bernte_one]

Hello Nick can you name all parts according to shematic? IC1 ,IC2 R1......
just to be sure if we get Problems that we discuss over same partnumbers

i am sure i make this smd pcb this Weekend, nice dimensions

and for professionell production you can Switch all holes to trough hole plating
there is no additionel Charge at most producers

[BC547]

Nice work, Nick

How do you plan to program the SMD PIC ?
Pre-program it and solder it on the board ? -> impossible to update it afterwards.
You could also stuff a small connector to the programming pins so that it can be updated in the field ?
Not that any updates are needed of course...
With my prototypes, I like to update a lot to try out different things. In that case, an onboard programming connector would be the only solution.

[nick holas]

v2 of the pickini v4 smd pcb with corrections

hi bernard
hi all
here is the corrected pcb (i say it wasn t error free!!!) and i find some
so i corrected all i saw ,the wrong smd transistor pinout ,some track was a little thick,and i made it a little bit smallest 68X33 mm
if someone are interested and see other tell it and i ll correct it
thanks

pickini v42 smd.zip
have nice day