new arduino metal detector atmega328 with five colis.... and lm 339

this project maybe very interesting....
this is the code atmega328 arduino sketch. look at...
// Arduino Five Coil Metal Detector

/* V21 - Production Version with dynamic thresholds and auto calibrate, Adjusted LED Brightness to maximum

*/

int ledthreshold1 = 40;
int ledthreshold2 = 40;
int ledthreshold3 = 40;
int ledthreshold4 = 40;
int ledthreshold5 = 40;

int threshdiff = 15; // Add to average to become specific threshold where LED will light (Changed V21 from 25 to 20)

long pulse1 = 0; // Stores the length of pulses in microseconds 
long pulse2 = 0; // Stores the length of pulses in microseconds
long pulse3 = 0; // Stores the length of pulses in microseconds
long pulseav = 0; // Stores value of output for calibration

int minthresh = 20; // Minimum threshold for baseline reading
int startdelay = 700; // Start at this value and work down for calibration


long pcounterA; // Counts the number of pulses in each cycle
long pcounterB; // Counts the number of pulses in each cycle
long pcounterC; // Counts the number of pulses in each cycle
long pcounterD; // Counts the number of pulses in each cycle
long pcounterE; // Counts the number of pulses in each cycle


int dly1 = 300; // Delay before sampling pulsewidth A
int dly2 = 300; // Delay before sampling pulsewidth B
int dly3 = 300; // Delay before sampling pulsewidth C
int dly4 = 300; // Delay before sampling pulsewidth D
int dly5 = 300; // Delay before sampling pulsewidth E


void setup()
{

Serial.begin(115200); // Setupserial interface for test data outputs

pinMode(2,INPUT); // Calibrate Button

pinMode(3,OUTPUT); // Pulse output from D3 Arduino
pinMode(4,INPUT); // Signal from LM339 in read by D4 on Arduino

pinMode(5,OUTPUT); // Pulse output from D5 Arduino
pinMode(6,INPUT); // Signal from LM339 in read by D6 on Arduino

pinMode(7,OUTPUT); // Pulse output from D5 Arduino
pinMode(8,INPUT); // Signal from LM339 in read by D6 on Arduino

pinMode(9,OUTPUT); // Pulse output from D5 Arduino
pinMode(10,INPUT); // Signal from LM339 in read by D6 on Arduino

pinMode(11,OUTPUT); // Pulse output from D5 Arduino
pinMode(12,INPUT); // Signal from LM339 in read by D6 on Arduino

pinMode(14,OUTPUT); // LED output to indicate a find on A0
pinMode(15,OUTPUT); // LED output to indicate a find on A1
pinMode(16,OUTPUT); // LED output to indicate a find on A2
pinMode(17,OUTPUT); // LED output to indicate a find on A3
pinMode(18,OUTPUT); // LED output to indicate a find on A4



}
void loop()
{
// Reset the pulse counter to zero for this cycle of waveform
pcounterA = 0;
pcounterB = 0;
pcounterC = 0;
pcounterD = 0;
pcounterE = 0;


// Auto Calibrate Coil Sensitivity if button pushed

if((digitalRead(2) == LOW) ){
  delay(100); // Debounce by waiting then checking again
  if((digitalRead(2) == LOW) ){
  // Carry out operation
 
  calibrate(); // Sets individual dly variable
 

  }
}



// Pulse and read Coil A three times  ---------------------------------------------

digitalWrite(7,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(7,LOW); // Set low on output pin
delayMicroseconds(dly1); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterA =   pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20);

digitalWrite(7,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(7,LOW); // Set low on output pin
delayMicroseconds(dly1); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterA =  pcounterA + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20);

digitalWrite(7,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(7,LOW); // Set low on output pin
delayMicroseconds(dly1); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterA =   pcounterA + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20);


// Pulse and read Coil B three times  ---------------------------------------------

digitalWrite(5,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(5,LOW); // Set low on output pin
delayMicroseconds(dly2); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterB =   pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20);

digitalWrite(5,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(5,LOW); // Set low on output pin
delayMicroseconds(dly2); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterB =   pcounterB + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20);

digitalWrite(5,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(5,LOW); // Set low on output pin
delayMicroseconds(dly2); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterB =   pcounterB + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20);

// Pulse and read Coil C three times ---------------------------------------------

digitalWrite(11,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(11,LOW); // Set low on output pin
delayMicroseconds(dly3); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterC = pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20);

digitalWrite(11,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(11,LOW); // Set low on output pin
delayMicroseconds(dly3); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterC = pcounterC + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20);

digitalWrite(11,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(11,LOW); // Set low on output pin
delayMicroseconds(dly3); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterC = pcounterC + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20);



// Pulse and read Coil D three times   ---------------------------------------------

digitalWrite(3,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(3,LOW); // Set low on output pin
delayMicroseconds(dly4); // Wait before reading pulses


pcounterD = pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20);

digitalWrite(3,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(3,LOW); // Set low on output pin
delayMicroseconds(dly4); // Wait before reading pulses


pcounterD = pcounterD + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20);

digitalWrite(3,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(3,LOW); // Set low on output pin
delayMicroseconds(dly4); // Wait before reading pulses


pcounterD = pcounterD + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20);



// Pulse and read Coil E three times     ---------------------------------------------

digitalWrite(9,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(9,LOW); // Set low on output pin
delayMicroseconds(dly5); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterE =   pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20);

digitalWrite(9,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(9,LOW); // Set low on output pin
delayMicroseconds(dly5); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterE =   pcounterE + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20);

digitalWrite(9,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(9,LOW); // Set low on output pin
delayMicroseconds(dly5); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pcounterE =   pcounterE + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20);

/*

Serial.print(pcounterA);
Serial.print(" ");
Serial.print(pcounterB);
Serial.print(" ");
Serial.print(pcounterC);
Serial.print(" ");
Serial.print(pcounterD);
Serial.print(" ");
Serial.print(pcounterE);

// Show delay variables

Serial.print("      ");
Serial.print(dly1);
Serial.print(" ");
Serial.print(dly2);
Serial.print(" ");
Serial.print(dly3);
Serial.print(" ");
Serial.print(dly4);
Serial.print(" ");
Serial.print(dly5);

Serial.print("      ");
Serial.print(pulse1);
Serial.print(" ");
Serial.print(pulse2);
Serial.print(" ");
Serial.print(pulse3);
Serial.print(" ");
Serial.println(pulseav);

*/

// Display results
digitalWrite(14,LOW); // Set the output pin to Low to deactivate the LED

if(pcounterA < ledthreshold1)
{
digitalWrite(14,HIGH); // Set the output pin to high to activate the LED
}

digitalWrite(15,LOW); // Set the output pin to Low to deactivate the LED

if(pcounterB < ledthreshold2)
{
digitalWrite(15,HIGH); // Set the output pin to high to activate the LED
}

digitalWrite(16,LOW); // Set the output pin to Low to deactivate the LED

if(pcounterC < ledthreshold3)
{
digitalWrite(16,HIGH); // Set the output pin to high to activate the LED
}

digitalWrite(17,LOW); // Set the output pin to Low to deactivate the LED

if(pcounterD < ledthreshold4)
{
digitalWrite(17,HIGH); // Set the output pin to high to activate the LED
}

digitalWrite(18,LOW); // Set the output pin to Low to deactivate the LED

if(pcounterE < ledthreshold5)
{
digitalWrite(18,HIGH); // Set the output pin to high to activate the LED
}



/* delay(10);  // Sets up LED brightness
// Turn off all LEDs
digitalWrite(14,LOW); // Set the output pin to Low to deactivate the LED
digitalWrite(15,LOW); // Set the output pin to Low to deactivate the LED
digitalWrite(16,LOW); // Set the output pin to Low to deactivate the LED
digitalWrite(17,LOW); // Set the output pin to Low to deactivate the LED
digitalWrite(18,LOW); // Set the output pin to Low to deactivate the LED
*/


}


// Subroutines


void calibrate()      {
 
// Turn off all LEDs
digitalWrite(14,LOW); // Set the output pin to Low to deactivate the LED
digitalWrite(15,LOW); // Set the output pin to Low to deactivate the LED
digitalWrite(16,LOW); // Set the output pin to Low to deactivate the LED
digitalWrite(17,LOW); // Set the output pin to Low to deactivate the LED
digitalWrite(18,LOW); // Set the output pin to Low to deactivate the LED

// Calibrate Coil A delay threshold ------------------------------------------------------------

dly1 = startdelay; // Start with very high threshold and work down in steps of 10
pulseav = 0;


while (pulseav <= minthresh ){

  digitalWrite(7,HIGH); // Set the output pin to high
  delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
  digitalWrite(7,LOW); // Set low on output pin
  delayMicroseconds(dly1); // Wait before reading pulses

  // Measure the number of pulses in each cycle produced by the LC circuit

  pulse1 =   pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20); 

  digitalWrite(7,HIGH); // Set the output pin to high
  delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
  digitalWrite(7,LOW); // Set low on output pin
  delayMicroseconds(dly1); // Wait before reading pulses

  // Measure the number of pulses in each cycle produced by the LC circuit

  pulse2 =   pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20);
 
    digitalWrite(7,HIGH); // Set the output pin to high
  delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
  digitalWrite(7,LOW); // Set low on output pin
  delayMicroseconds(dly1); // Wait before reading pulses

  // Measure the number of pulses in each cycle produced by the LC circuit

  pulse3 =   pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20)+ pulseIn(8,HIGH,20) + pulseIn(8,HIGH,20);
 
  pulseav = (pulse1 + pulse2 + pulse3)/3;
 
  // Decrement threshold if output too low
  if(pulseav < minthresh) {
    dly1 = dly1 - 10;
    }
  }
  // Flash LED to prove something done
  digitalWrite(14,HIGH); // Set the output pin to high to activate the LED
  delay(5);
  digitalWrite(14,LOW); // Set the output pin to high to activate the LED

ledthreshold1 = pulseav + threshdiff;

// Calibrate Coil B delay threshold  ------------------------------------------------------------

dly2 = startdelay; // Start with very high threshold and work down in steps of 10
pulseav = 0;


while (pulseav <= minthresh ){

digitalWrite(5,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(5,LOW); // Set low on output pin
delayMicroseconds(dly2); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pulse1 =   pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20);

digitalWrite(5,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(5,LOW); // Set low on output pin
delayMicroseconds(dly2); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pulse2 =   pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20);
 
digitalWrite(5,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(5,LOW); // Set low on output pin
delayMicroseconds(dly2); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pulse3 =   pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20)+ pulseIn(6,HIGH,20) + pulseIn(6,HIGH,20);
 
  pulseav = (pulse1 + pulse2 + pulse3)/3;
 
  // Decrement threshold if output too low
  if(pulseav < minthresh) {
    dly2 = dly2 - 10;
    }
  }
  // Flash LED to prove something done
  digitalWrite(15,HIGH); // Set the output pin to high to activate the LED
  delay(5);
  digitalWrite(15,LOW); // Set the output pin to high to activate the LED
 
  ledthreshold2 = pulseav + threshdiff;
 

// Calibrate Coil C delay threshold  ------------------------------------------------------------

dly3 = startdelay; // Start with very high threshold and work down in steps of 10
pulseav = 0;


while (pulseav <= minthresh ){

digitalWrite(11,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(11,LOW); // Set low on output pin
delayMicroseconds(dly3); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pulse1 = pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20);

digitalWrite(11,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(11,LOW); // Set low on output pin
delayMicroseconds(dly3); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pulse2 = pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20);
 
digitalWrite(11,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(11,LOW); // Set low on output pin
delayMicroseconds(dly3); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pulse3 = pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20)+ pulseIn(12,HIGH,20) + pulseIn(12,HIGH,20);
 
  pulseav = (pulse1 + pulse2 + pulse3)/3;
 
  // Decrement threshold if output too low
  if(pulseav < minthresh) {
    dly3 = dly3 - 10;
    }
  }
  // Flash LED to prove something done
  digitalWrite(16,HIGH); // Set the output pin to high to activate the LED
  delay(5);
  digitalWrite(16,LOW); // Set the output pin to high to activate the LED
 
ledthreshold3 = pulseav + threshdiff;


// Calibrate Coil D delay threshold  ------------------------------------------------------------

dly4 = startdelay; // Start with very high threshold and work down in steps of 10
pulseav = 0;

while (pulseav <= minthresh ){

digitalWrite(3,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(3,LOW); // Set low on output pin
delayMicroseconds(dly4); // Wait before reading pulses


pulse1 = pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20);

digitalWrite(3,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(3,LOW); // Set low on output pin
delayMicroseconds(dly4); // Wait before reading pulses


pulse2 = pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20);
 
digitalWrite(3,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(3,LOW); // Set low on output pin
delayMicroseconds(dly4); // Wait before reading pulses


pulse3 = pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20)+ pulseIn(4,HIGH,20) + pulseIn(4,HIGH,20);
 
  pulseav = (pulse1 + pulse2 + pulse3)/3;
 
  // Decrement threshold if output too low
  if(pulseav < minthresh) {
    dly4 = dly4 - 10;
    }
  }
  // Flash LED to prove something done
  digitalWrite(17,HIGH); // Set the output pin to high to activate the LED
  delay(5);
  digitalWrite(17,LOW); // Set the output pin to high to activate the LED
 
  ledthreshold4 = pulseav + threshdiff;
 

// Calibrate Coil E delay threshold  ------------------------------------------------------------

dly5 = startdelay; // Start with very high threshold and work down in steps of 10
pulseav = 0;

while (pulseav <= minthresh ){

digitalWrite(9,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(9,LOW); // Set low on output pin
delayMicroseconds(dly5); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pulse1 =   pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20);


digitalWrite(9,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(9,LOW); // Set low on output pin
delayMicroseconds(dly5); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pulse2 =   pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20);

digitalWrite(9,HIGH); // Set the output pin to high
delayMicroseconds(5000); // Delay 5000 microseconds before setting low on output pin
digitalWrite(9,LOW); // Set low on output pin
delayMicroseconds(dly5); // Wait before reading pulses

// Measure the number of pulses in each cycle produced by the LC circuit

pulse2 =   pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20)+ pulseIn(10,HIGH,20) + pulseIn(10,HIGH,20);


 
  pulseav = (pulse1 + pulse2 + pulse3)/3;
 
  // Decrement threshold if output too low
  if(pulseav < minthresh) {
    dly5 = dly5 - 10;
    }
  }
  // Flash LED to prove something done
  digitalWrite(18,HIGH); // Set the output pin to high to activate the LED
  delay(5);
  digitalWrite(18,LOW); // Set the output pin to high to activate the LED
 
 
  ledthreshold5 = pulseav + threshdiff;
 

}


Posted on: August 20, 2015, 09:40:30 am

---

this is the page......

You are not allowed to view links.
Please Register or Login

Posted on: August 20, 2015, 09:42:04 am

---

schematic.....

You are not allowed to view links.
Please Register or Login

i don t know how to put one image this project

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60763.msg300341.html#msg300341

Maybe so but the code is unverified. I'll see if I can't find it in zip format somewhere because we can't put a text file in downloads or as an attachment.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60763.msg300347.html#msg300347

There's only 2 links. the rest is all C code. Would have been better if he had just posted it as a file. The YouTube video shows it working. It's just a simple oscillator circuit that gets loaded down by a target. I  am guessing it doesn't have much depth. Probably best suited for robotic collision avoidance. You must admit it looks pretty cool and not your run of the mill detector. He isn't boasting that it's the next greatest thing, but I  like his thinking.

Welcome to the forum Sergio.

Dusty Carl

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60763.msg300350.html#msg300350

A bad day at gold prospecting or metal detecting is better than a good day at work.

		Quote:			Posted by Sergio Dennis Sanchez Madrigal
	the code arduino metal detecxtor atmega328 in download. ino format

Not to worry anyone. I turned it into a pdf. I  hope this uploads.

Dusty Carl

Posted on: August 20, 2015, 04:18:19 pm

---

All,

If you click on it and don't see it, check your download folder. It may have went there, or maybe you don't have Adobe Acrobat Reader.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,60763.msg300359.html#msg300359

A bad day at gold prospecting or metal detecting is better than a good day at work.