Arduino metal detector?

[FoxyLab]

Here's a demo - the signal output from the op-amp:

Since the op amp gain is small for stable operation of the comparator circuit, then for clarity using large targets placed in the coil - 1 (without target), 2 (beer can), 3 (dumbbell).
Taking the curve of exponential function, defined for fun time constant for dumbbell - 84 microseconds.
P.S. I went back to the old version of the driver:

This circuit is the most stable.

[captainart3000]

Attached is my old schematic for arduino shield

[Watanabe]

Attached is my old schematic for arduino shield

This long board is the same circuit?
Thanks.

https://www.youtube.com/watch?v=Sg1dT_T4AXY


...

[bernte_one]

Hello captainart3000,

can you provide sourve file or hexcode?

which Controller is it atmel or pic?

[6666]

Hello captainart3000,

can you provide sourve file or hexcode?

which Controller is it atmel or pic?

you can contact him at [email protected]

[6666]

Hi Foxylab

I am trying to find out the value of L2 the choke in the 12 v battery supply of your PI circuit, could you please tell what is its value ? thanks.
http://acdc.foxylab.com/sites/defaul...s/foxyPIv2.png

[6666]

I tried this project, but the way the LEDs light up in response to a target is too hard to follow.
http://alex---1967.narod.ru/PI_metal...arduino_u.html

[homefire]

What does it do? Random ? Erratic? To Fast?

[6666]

All of the above (Random ? Erratic? To Fast?)

[homefire]

LOL The code looks like it's trying to light all LED's at the same time to me. Not by levels.

[homefire]

Try this. Should give you progressing LED.


// PI metal detector for arduino version_16_min (C)alex---1967 2015
byte ss = 0;
byte c = 0;
byte i = 0;
int s0 = 0;
int s1 = 0;


void setup()
{
DDRB = 0xFF; // port B - all out
DDRD = 0xFF; // port D - all out

for (i = 0; i <16; i++) // калибровка / calibration
{
s0 = analogRead(A0);
s1 = analogRead(A0);
c = c + s1;
}
c = c / 16;
c = c - 2;
}

void loop()
{
PORTB = B11111111; // переводим пины порта B в 1, открывая т.о. ключ (turn on)
delayMicroseconds(200); // wait 200 microseconds
PORTB = 0; // закрывааем ключ, прерывая ток в поисковой катушке (turn off - interrupt circut in search coil )

s0 = analogRead(A0);
s1 = analogRead(A0);

ss = s1 - c;
ss = ss / 2;

PORTD = ss; // посылаем на индикатор (send to LEDs)


delay(4);
}









// PI metal detector for arduino version_18_min (C)alex---1967 2015 **** Modified LED Progression I Hope
int ss0 = 0;
int ss1 = 0;
int ss2 = 0;
long c0 = 0;
long c1 = 0;
long c2 = 0;
byte i = 0;
int sss0 = 0;
int sss1 = 0;
int sss2 = 0;
int s0 = 0;
int s1 = 0;
int s2 = 0;


void setup()
{
DDRB = 0xFF; // port B - all out
DDRD = 0xFF; // port D - all out

for (i = 0; i <255; i++) // калибровка / calibration
{
PORTB = B11111111; // переводим пины порта B в 1, открывая т.о. ключ (turn on)
delayMicroseconds(200); // wait 200 microseconds
PORTB = 0; //
delayMicroseconds(20);
s0 = analogRead(A0);
s1 = analogRead(A0);
s2 = analogRead(A0);
c0 = c0 + s0;
c1 = c1 + s1;
c2 = c2 + s2;


delay(3);
}
c0 = c0 / 255;
c0 = c0 - 5;
c1 = c1 / 255;
c1 = c1 - 5;
c2 = c2 / 255;
c2 = c2 - 5;


}

void loop()
{
PORTB = B11111111; // переводим пины порта B в 1, открывая т.о. ключ (turn on)
delayMicroseconds(200); // wait 200 microseconds
PORTB = 0; // закрывааем ключ, прерывая ток в поисковой катушке (turn off - interrupt circut in search coil )
delayMicroseconds(20);
s0 = analogRead(A0);
s1 = analogRead(A0);
s2 = analogRead(A0);
ss0 = s0 - c0;

if (ss0 < 0)
{
sss0 = 1;
}
ss0 = ss0 / 16;
PORTD = ss0; // посылаем на индикатор (send to LEDs)
delay(1);

ss1 = s1 - c1;
if (ss1 < 0)
{
sss1 = 1;
}
ss1 = ss1 / 16;
PORTD = ss1; // посылаем на индикатор (send to LEDs)
delay(1);


ss2 = s2 - c2;
if (ss2 < 0)
{
sss2 = 1;
}
ss2 = ss2 / 16;
PORTD = ss2; // посылаем на индикатор (send to LEDs)
delay(1);

if ( sss0+sss1+sss2 > 2)
{
digitalWrite(0,HIGH);
delay(2);
sss0 = 0;
sss1 = 0;
sss2 = 0;
if ( sss0+sss1+sss2 > 3)
{
digitalWrite(1,HIGH);
digitalWrite(0,HIGH);
delay(1);
sss0 = 0;
sss1 = 0;
sss2 = 0;
}
if ( sss0+sss1+sss2 > 4)
{
digitalWrite(3,HIGH);
digitalWrite(2,HIGH);
digitalWrite(1,HIGH);
digitalWrite(0,HIGH);
delay(1);
sss0 = 0;
sss1 = 0;
sss2 = 0;
}
if ( sss0+sss1+sss2 > 5)
{

digitalWrite(4,HIGH);
digitalWrite(3,HIGH);
digitalWrite(2,HIGH);
digitalWrite(1,HIGH);
digitalWrite(0,HIGH);
delay(1);
sss0 = 0;
sss1 = 0;
sss2 = 0;
}
if ( sss0+sss1+sss2 > 6)
{
digitalWrite(5,HIGH);
digitalWrite(4,HIGH);
digitalWrite(3,HIGH);
digitalWrite(2,HIGH);
digitalWrite(1,HIGH);
digitalWrite(0,HIGH);
delay(1);
sss0 = 0;
sss1 = 0;
sss2 = 0;
}
if ( sss0+sss1+sss2 > 7)
{

digitalWrite(6,HIGH);
digitalWrite(5,HIGH);
digitalWrite(4,HIGH);
digitalWrite(3,HIGH);
digitalWrite(2,HIGH);
digitalWrite(1,HIGH);
digitalWrite(0,HIGH);
delay(1);
sss0 = 0;
sss1 = 0;
sss2 = 0;
}if ( sss0+sss1+sss2 >
{
digitalWrite(7,HIGH);
digitalWrite(6,HIGH);
digitalWrite(5,HIGH);
digitalWrite(4,HIGH);
digitalWrite(3,HIGH);
digitalWrite(2,HIGH);
digitalWrite(1,HIGH);
digitalWrite(0,HIGH);
delay(1);
sss0 = 0;
sss1 = 0;
sss2 = 0;
}
}

[6666]

Thanks for the code, but there is a small error when I try and verify the code here is the error message (there is a smiley face in the code would that cause a problem ?)

Arduino: 1.6.11 (Windows 7), Board: "Arduino Nano, ATmega328"

C:\Felz\sketch_may01a\sketch_may17a\sketch_may17a. ino: In function 'void loop()':

sketch_may17a:154: error: expected primary-expression before '{' token

{

^

sketch_may17a:154: error: expected ')' before '{' token

sketch_may17a:168: error: expected primary-expression before '}' token

}

^

sketch_may17a:168: error: expected '}' at end of input

exit status 1
expected primary-expression before '{' token

[Qiaozhi]

Thanks for the code, but there is a small error when I try and verify the code here is the error message (there is a smiley face in the code would that cause a problem ?)

Arduino: 1.6.11 (Windows 7), Board: "Arduino Nano, ATmega328"

C:\Felz\sketch_may01a\sketch_may17a\sketch_may17a. ino: In function 'void loop()':

sketch_may17a:154: error: expected primary-expression before '{' token

{

^

sketch_may17a:154: error: expected ')' before '{' token

sketch_may17a:168: error: expected primary-expression before '}' token

}

^

sketch_may17a:168: error: expected '}' at end of input

exit status 1
expected primary-expression before '{' token

You need to replace with "8" followed by ")".
The bulletin board interprets this as "glasses".

[6666]

Thanks for the tip about the glasses, I fixed that part of the code but it still says an error somewhere here is the error message

Arduino: 1.6.11 (Windows 7), Board: "Arduino Nano, ATmega328"

C:\Felz\sketch_may01a\sketch_may17a\sketch_may17a\ sketch_may17a.ino: In function 'void loop()':

sketch_may17a:168: error: expected '}' at end of input

}

^

exit status 1
expected '}' at end of input

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

[Qiaozhi]

Thanks for the tip about the glasses, I fixed that part of the code but it still says an error somewhere here is the error message

Arduino: 1.6.11 (Windows 7), Board: "Arduino Nano, ATmega328"

C:\Felz\sketch_may01a\sketch_may17a\sketch_may17a\ sketch_may17a.ino: In function 'void loop()':

sketch_may17a:168: error: expected '}' at end of input

}

^

exit status 1
expected '}' at end of input

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Sorry - I cannot help you with that, as I've never used an Arduino.