Metal Detector based Attiny13

Description

This Metal Detector based Attiny13 is based on the principle of frequency displacement when a magnetic material is close to the oscillator coil.

At first the microcontroller gets the frequency of oscillation, when the frequency change it lights one to four leds, according to the displacement amount.

Components

BAT – 9v battery	x 1
SW – Switch	x 1
U1 – 78L05	x 1
IND – Detection coil. Aprox. 22 turns 25 cm. diameter.	x 1
U2 – Attiny13	x 1
U3 – BC548	x 1
U5 – 2N7002	x 1
D1 – D4 – Led	x 4
R1 – 3.1K	x 1
R2 – 100	x 1
R3 – 1K	x 1
R4 – 10K	x 1
R5 – R8 – 470	x 1
C1 – C3 – 100nf	x 1
C4 – 4.7uf	x 1

Schematic and Layout

Printed Circuit Board PCB

Download files

Download files

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