Arduino metal detector?

[kosacid]

yes works fine but i did add a 205 trimmer to R8 and turned the trimmer till i got a flat line on the scope

this is when i put a coin near it

this is the output from the opamp to the arduino

[6666]

Thanks I will alter the delay and see what happens .

The longer delay makes a difference, it is making more sense now, I will be back later

[6666]

Thanks I will alter the delay and see what happens .

[homefire]

Try adding a few more uS of delay at each delay point. Make a Delay 1 Delay 5..


======


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); ------------------------------------------------------------------------------------------ Add Here


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

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

digitalWrite(4,HIGH);
digitalWrite(3,HIGH);
digitalWrite(2,HIGH);
digitalWrite(1,HIGH);
digitalWrite(0,HIGH);
delay(1); -------------------------------------------------------------------------------Add Here
}
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); ---------------------------------------------------------------------------------------Add Here
}
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); -----------------------------------------------------------Add Here
sss0 = 0;
sss1 = 0;
sss2 = 0;
}
}

[6666]

fix the 8 and add a } at the end

Thanks for the information, yes it worked, I took a fresh copy of Homefires code in post #86 (Thanks Homey) and fixed the "8' and added an extra } at the very end of the code and it verify's and uploads to the nano, it does work a little better than the original code you can see some progression in the BRIGHTNESS and flickering of the led's, to a point, but the way the leds are so erratic its very hard to work out what the meaning of the erratic flickering leds are indicating. It was fun trying.

[6666]

Thanks for the code, it will verify and upload to the nano, but all that happens with any signal input to A0, is the led that is connected to pin 2 / D0/ RX stays permanently lit and nothing else changes.

The code can be made a lot more compact.

int s[3] = {0};
int ss[3] = {0};
int sss[3] = {0};
long c[3] = {0};

void setup()
  {
  DDRB = 0xFF; // port B - all out
  DDRD = 0xFF; // port D - all out
  
  for (char i = 0; i <255; i++) // калибровка / calibration
    {
    PORTB = 0b11111111; // переводим пины порта B в 1, открывая т.о. ключ (turn on)
    delayMicroseconds(200); // wait 200 microseconds
    PORTB = 0; //
    delayMicroseconds(20);
    s[0] = analogRead(A0);
    s[1] = analogRead(A0);
    s[2] = analogRead(A0);
    c[i] += s[i];
    delay(3);
  }
  for (char i = 0; i <3; i++)  c[i] = (c[i] >> 8) - 5;
}

void loop()
  {
  PORTB = 0b11111111; // 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);
  s[0] = analogRead(A0);
  s[1] = analogRead(A0);
  s[2] = analogRead(A0);

  for (char i = 0; i < 3; i++) 
    {
    ss[i] = s[i] - c[i];
    if (ss[i] < 0) sss[i] = 1;
    ss[i] = ss[i] >> 4;
    PORTD = ss[i]; // посылаем на индикатор (send to LEDs)
    delay(1);
  }

  int code =  sss[0] + sss[1] + sss[2];
  PORTD = (code > 8)? 0xFF : (1 << code) - 1;
  delay(1);
  sss[0] = 0;
  sss[1] = 0;
  sss[2] = 0;
} 

[6666]

Thanks guys for the responses, I have some results which I post individually.

[homefire]

Way above my pay scale ! LOL

[Teleno]

The code can be made a lot more compact.

int s[3] = {0};
int ss[3] = {0};
int sss[3] = {0};
long c[3] = {0};

void setup()
  {
  DDRB = 0xFF; // port B - all out
  DDRD = 0xFF; // port D - all out
  
  for (char i = 0; i <255; i++) // калибровка / calibration
    {
    PORTB = 0b11111111; // переводим пины порта B в 1, открывая т.о. ключ (turn on)
    delayMicroseconds(200); // wait 200 microseconds
    PORTB = 0; //
    delayMicroseconds(20);
    s[0] = analogRead(A0);
    s[1] = analogRead(A0);
    s[2] = analogRead(A0);
    c[i] += s[i];
    delay(3);
  }
  for (char i = 0; i <3; i++)  c[i] = (c[i] >> 8) - 5;
}

void loop()
  {
  PORTB = 0b11111111; // 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);
  s[0] = analogRead(A0);
  s[1] = analogRead(A0);
  s[2] = analogRead(A0);

  for (char i = 0; i < 3; i++) 
    {
    ss[i] = s[i] - c[i];
    if (ss[i] < 0) sss[i] = 1;
    ss[i] = ss[i] >> 4;
    PORTD = ss[i]; // посылаем на индикатор (send to LEDs)
    delay(1);
  }

  int code =  sss[0] + sss[1] + sss[2];
  PORTD = (code > 8)? 0xFF : (1 << code) - 1;
  delay(1);
  sss[0] = 0;
  sss[1] = 0;
  sss[2] = 0;
} 

[homefire]

Hope this does the job. Modified the Digital Write to progress in step with Int ss levels keeping LED's ON until end of cycle at which time they are cleared.

You said LED were Jumping. Did you wire LED in sequence ? On the NANO D0 and D1 are Reversed.

I'm a NU BEE at this Arduino thing too so I hope I got this right.






ArduinoNano30Schematic.pdf

RussianPIModifiedCode1.txt

[homefire]

Just scratch that . I used cut and past to copy the Write to commands and forgot to delete the Clear commands on each step so it would never see any progression. I'll correct it and post as attachment. Sorry. http://www.pacdv.com/sounds/fart-sounds/fart-7.mp3

[kosacid]

fix the 8 and add a } at the end

[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.

[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 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".