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

[Alfredo Padrao]

I think this is correct

Is this layout with only PIC16F1824 smd available in sprint.lay or in pdf?

[F117]

Another layout with the LM318 mask upside down. Pin 4 = GND.

[popka-ru]

How much "KOM" should be a trimmer SENS? 10? 50? 100?

[F117]

The sensitivity potmeter can be 4K7 or 10K.

[popka-ru]

how to remove the voltage limit. that would work at least 7-8v and not from 10-12v? and then one battery 6f22 only lasts for 20 minutes and then does not work. is the detail responsible for the voltage limit?

[F117]

No idea why you would want lower voltage ?
Most people use 3 x LiIon 16850 in series to achieve a 12V power supply.
Old laptops are a free source for these batteries - and they have plenty of capacity to search for many hours in a row without recharging.
Also lower voltage means less current through the coil.

The 6f22 9V blocks don't have enough capacity and too high impedance to deliver the current needed in a PI detector.

[popka-ru]

OK. we will adhere to your recommendations. just wanted to achieve the minimum size and weight. I plan to make a metal detector of this design.

[popka-ru]

[rodrigo_mattia]

Hello, Greetings from Brazil. One question, it is possible to use li ion battery pack with 4 x 18650 , and down the voltage with a 7812 before pickini board. Or is better that coil had feed direct from battery pack?

[F117]

Yes, have a look at the schematic of Pickini V1 :

[rodrigo_mattia]

ok,thank you !

[popka-ru]

I had a question, it's an idea. the microcontroller has 2 loose contacts 6 and 7. why not use them for the control button instead of the potentiometer.? sensitivity control with one button. make an electronic potentiometer as a macro-pointer, such as a chim. One press decreases and the double increases gradually the current by sen.
eg 6 exit for the button, 7 output to the potentiometer. through the transistor. if it is possible to implement in this case with this controller, then it would be just super. so we solve the problem with tightness in the underwater version and simplify the control of the settings.


for example 5-6 steps of sensitivity, 15-20% adds each step. each stage of sensitivity is accompanied by a number of signals. for example, the first one is a peak signal, the maximum is one long or 5-6 peak-peak.
spied on the options of LED brightness control..

[F117]

Nice idea, but pin 7 is already in use as a LED output = detection indicator. Have a look at post #450 of this thread.
You have access to the source code.
Feel free to modify it to support your pushbutton controls and please share the code / schematic with us when it works.

Whe you are still looking for a low voltage solution, have a look at Teemo's pulse oscillation detector:
http://www.geotech1.com/forums/showt...tector-project

[popka-ru]

unfortunately I do not know how to program. I only know how to construct and collect. Therefore I ask you to do so, if possible. because before this firmware did not use output 7 and 6.
The more options for a metal detector, the better. because everyone chooses the right one for himself. I could stimulate you (Donat), if that interests you.
and so will have to use additional chips, and this entails an increase in the size of the board and the number of parts.

[pigeon]

hello all friends

please this a discriminate detector


thank you