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Tracker PI-2 metal detector

The microcontroller-based pulse induction metal detector Tracker PI appeared on the market back in 2003, and immediately gained immense popularity among users. Then the circuit received some improvements, and several versions of firmware were released including and deep and from the “first Tracer” appeared Tracker PI-2, Koschey 2I and Koschey 4IG.

Koschey 2And this is a commercial metal detector (its firmware is not freely available), but you can buy it not only with the assembled metal detector, but also with a board and kit for self-assembly. “Master Kit” released this kit under the number NM8042 (Tracker PI), but with the advent of Koshchei 5I, it was he who often sold under this number. But a more complete version of the kit appeared with a modified board (Tracker PI-2), with accessories not only for the unit, but also for the manufacture of the search coil, which is sold in the Tracker PE store (website: http://detectori.com.ua /).

Koschey 2I and Tracker PI-2 is one metal detector, and Koschey 4IG is its deep version, it differs in microcontroller firmware. Also, this metal detector was sold under various  names.

Based on the Koshchei 2I scheme, the non-profit Clone metal detector (with open firmware) was developed. But Koschey 2I worked frankly better than the Clones, and even all the improvements Clone PI-W and Clone PI-AVR are only trying to get closer to Koshchei 2I in terms of quality of work. And even released by the company Koschey 5I, not far went around Koschey 2I.

Tracker PI schematic

Tracker PI metal detector circuit (initial version of the circuit, also the circuit is relevant for the NM8042 kit)

Scheme of the metal detector Koschey 2I, Koschey 4IG and Tracker PI-2

Tracker PI-2 printed circuit board PCB

Tracker PI-2 Components list and assembling

For ease of assembly, you will find the list of components here.

C1 – 2200 16v 
C2, C3, C7, C10, C11, C14 – 0.1 
C4, C5 – 27p 
C6, C12, C13, C15, C16, C17 – 470p 
C8 – 4.7n 
C9 – 0.3

R1, R3 – 390 0.5W 
R2, R30 – 20 
R7 – 1k variable (sensitivity) 
R6, R8, R13, R18 (speaker volume), R22, R23, R24 – 1k 
R10 – 10k 
R4, R5, R9, R11, R12, R16, R17, R19, R25, R28 – 10k 
R14 – 2.4M 
R15, R26, R27 – 56k 
R20 – 20k 
R21 – 300k 
R29 – 4.7K variable (sensitivity on the case) 
R31 – 43k 
R32 – 20k variable ( threshold for battery level)

VT1 – IRF740 
VT2, VT3, VT4 – 2N5551

VD1, VD2 – 1N4148

D1 – TL074CN 
D2 – CD4066 
D3 – Attiny2313 
D4 – 78L05

Q1 – 10MHz

5 LEDs green 
1 LED red 
6 enclosures under them

S1 – reset button to the housing without fixing 
S3 – closes when using the LCD 
S4 – button to the housing with fixing (inclusion)

Everything is soldered according to the numbering on the board.

If you  decided to draw a front panel where there will be LEDs, a switch and a sensitivity control with a reset button. you can print the panel and select a resolution of 600 dpi.

Now let’s talk about the firmware. As I understand it, there is only one firmware for this metal detector. Version 2.4. People have problems when programming fuses. These are the ones I put into the Khazama AVR Programmer.

 
In words. You need to install work from an external quartz which we have over 8.0 MHz and disable “Devide clock by 8 internally”.

When studying forums, I found out that there is a very common problem. Namely, when the detector is turned on, the speaker emits short beeps and the red LED blinks. There may be a problem for several reasons. The R32 variable is not configured on the board, which is responsible for the level of notification of low battery, or it is really too low.

I recommend picking up the resistor number R18. It adjusts the speaker volume in the metal detector when triggered.

Download  necessary files

Firmware for metal detector Tracker PI-2 – Download.
PCB option as in the article (Sprint Layout)- Download.

PCB option as in the article (Gif file)- Download.
DesAlex Author Board Option – Download.
Another version of the printed circuit board as from the kit NM8042 master kit – Download.

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