Metal detector Qasar AVR microcontroller

Metal detector Qasar on the AVR microcontroller

The Quasar metal detector is a microcontroller-based IB metal detector designed with available electronic components. The metal detector uses a selective (selective) mode with audible multi-tone indication. There are 2 versions of the quasar metal detector circuit on the Atmega32 microcontroller and the STM32 microcontroller

Scheme of the Kvazar metal detector on the AVR microcontroller

Metal detector Qasar  AVR microcontroller

List of parts for assembling the metal detector quasar AVR

DesignationType of component
Value
R1resistor100 ohm
R2resistor2 kΩ
R3resistor100 Ohm *
R4resistor470 Ohm
R5resistor4.7 k Ohm
R6resistor1.2 k Ohm
R7resistor100 kΩ
R8resistor330 Ohm
R9resistor47 k Ohm
R10resistor10 kΩ
R11resistor1 kΩ
R12resistor62 Ohm
R13resistor1 kΩ
R14resistor1 kΩ
R15resistor100 kΩ
R16resistor3.6 k Ohm
R17resistor1.2 k Ohm
R16resistor3.6 k Ohm
R18resistor1.1 k Ohm
R21resistor10 kΩ
R22resistor1.5 k Ohm
R24resistor100 ohm
R25resistor10 ohm
R26resistor25 ohm
R27resistor25 | sum50 ohm
R28variable resistor10 kΩ
R29resistor10 kΩ
C2capacitor0.033
C3capacitor0.1
C5capacitor0.1
C6capacitor0.33 *
C7capacitor2200
C8capacitor1.0
C9capacitor0.1
C10capacitor47
C12capacitor0.1
C15capacitor0.1
C16capacitor0.1 (!)
C17capacitor0.1
C18capacitor22
C19capacitor0.1
C20capacitor0.1
C21capacitor22
C22capacitor0.47
C23capacitor0.1
C25capacitor0.1
C27capacitor0.1
C29capacitor0.1
C32capacitor0.1
C11electrolytic capacitor2200x10V
C13electrolytic capacitor1500x10V
C14electrolytic capacitor2200x10V
C33electrolytic capacitor1000x16V
C34electrolytic capacitor1000x16V
D1diode1N4148WS
D2diodeLED
D3diode1N4148WS
D4diode1N4148WS
D6diode1N4148WS
D7diodeSK16
D8diodeHER…, MURS…
D9diodeHER…, MURS…
VD1diode1N4148WS
VD2diode1N4148WS
VD3diode1N4148WS
VD4diode1N4148WS
Q1A, Q1Btransistor assemblyIRF7105 / SO
Q2transistorBC846BL
Q3transistorBC857BL
Q4transistorBC846BL
U2chipTL431
U3chipLP2950
U4chipMCP3201
U5chipATmega32A
U7chipLM2941S
U8chipMCP633
C1capacitor0.1
LCDdisplay
RC1602Awith controller HD44780 or KS0066
SW1-SW64-pin buttons
BQ1quartz 11.0592

The assembled metal detector looks like this

  • Metal detector Qasar  AVR microcontroller

Button functions

 

  • SW1 :  UP / Barrier + / Autotune
  • SW2 :  Enter / OK / Ground balance
  • SW3 :  Right (+) / PinPointer
  • SW4 :  Left (-) / Backlight
  • SW5 :   Menu / Esc
  • SW6 :  Down / Barrier- / Autotune

Setting fuse bits in PonyProg

Metal detector Qasar  AVR microcontroller

In the download section, Under microcontroller AVR there are two versions of the printed circuit board under the dip and SMD housing.
Printed circuit boards of the metal detector on the AVR microcontroller for dip and SMD cases in .lay format.

Search coil for metal detector Quasar

Metal detector Qasar  AVR microcontroller

The coil diameter is 230 mm. The coil consists of 2 parts: (DD coil)

  • transmitting TX – consists of 40-45 turns with 0.5mm wire;
  • receiving RX – 200 turns with 0.2 mm wire.

The TX transmission circuit is switched on according to the scheme with a serial oscillatory circuit with a capacitance of 0.3 μF. The frequency of the transmitting circuit is 8.192 kHz, but it can operate in the range of 4.5 – 9 kHz.

The RX receiving circuit is a parallel oscillatory circuit, tuned to a frequency below the TX circuit by an amount of the order of 1.5-2 kHz.

The assembled coil looks like this

Metal detector Qasar  AVR microcontroller

After winding, the coils should be filled with epaxidic resin, which will give shape and strength, as well as protect against moisture.

Download files

 

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