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

List of parts for assembling the metal detector quasar AVR

The assembled metal detector looks like this

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

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

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

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

Download files

• Metal detector diagram in pdf format

•  Latest firmware version 1.4.5

• quasar avr board by desalex.rar

• quasar smd-lay from pchela5.zip

• quazar dip-lay from ysdragon.rar