Metal Detector Modulenon Contact Metal Induction Sensor

OVERVIEW:

-Operating voltage: 5V DC.

-Detector distance: 1CM.

-Adjust the potentiometer, let the modules work normally.

-Small and easy to use module.

-It comes with a Buzzer for metal detection indication.

PACKAGE INCLUDES:

1 PCS x Metal Detector Modulenon Contact Metal Induction Sensor

//SOURCE CODE TAKEN FROM BELOW LINK

//https://github.com/evankale/ArduinoMetalDetector/blob/master/ArduinoMetalDetector.ino

/*

 * Copyright (c) 2016 Evan Kale

 * Media: @EvanKale91

 * Email: EvanKale91@gmail.com

 * Website: www.ISeeDeadPixel.com

 *          www.evankale.blogspot.ca

 *          www.youtube.com/EvanKale91

 *

 * This file is part of ArduinoMetalDetector.

 *

 * ArduinoMetalDetector is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

// Number of cycles from external counter needed to generate a signal event

#define CYCLES_PER_SIGNAL 5000

// Base tone frequency (speaker)

#define BASE_TONE_FREQUENCY 280

// Frequency delta threshold for fancy spinner to trigger

#define SPINNER_THRESHOLD 700

// Pin definitions

#define SENSITIVITY_POT_APIN 1

#define SPEAKER_PIN 2

#define SPINNER_PIN 9

#define TRIGGER_BTN_PIN 11

#define RESET_BTN_PIN 12

unsigned long lastSignalTime = 0;

unsigned long signalTimeDelta = 0;

boolean firstSignal = true;

unsigned long storedTimeDelta = 0;

// This signal is called whenever OCR1A reaches 0

// (Note: OCR1A is decremented on every external clock cycle)

SIGNAL(TIMER1_COMPA_vect)

{

  unsigned long currentTime = micros();

  signalTimeDelta =  currentTime - lastSignalTime;

  lastSignalTime = currentTime;

  if (firstSignal)

  {

    firstSignal = false;

  }

  else if (storedTimeDelta == 0)

  {

    storedTimeDelta = signalTimeDelta;

  }

  // Reset OCR1A

  OCR1A += CYCLES_PER_SIGNAL;

}

void setup()

{

  // Set WGM(Waveform Generation Mode) to 0 (Normal)

  TCCR1A = 0b00000000;

  // Set CSS(Clock Speed Selection) to 0b111 (External clock source on T0 pin

  // (ie, pin 5 on UNO). Clock on rising edge.)

  TCCR1B = 0b00000111;

  // Enable timer compare interrupt A (ie, SIGNAL(TIMER1_COMPA_VECT))

  TIMSK1 |= (1 << OCIE1A);

  // Set OCR1A (timer A counter) to 1 to trigger interrupt on next cycle

  OCR1A = 1;

  pinMode(SPEAKER_PIN, OUTPUT);

  pinMode(SPINNER_PIN, OUTPUT);

  pinMode(TRIGGER_BTN_PIN, INPUT_PULLUP);

  pinMode(RESET_BTN_PIN, INPUT_PULLUP);

}

void loop()

{

  if (digitalRead(TRIGGER_BTN_PIN) == LOW)

  {

    float sensitivity = mapFloat(analogRead(SENSITIVITY_POT_APIN), 0, 1023, 0.5, 10.0);

    int storedTimeDeltaDifference = (storedTimeDelta - signalTimeDelta) * sensitivity;

    tone(SPEAKER_PIN, BASE_TONE_FREQUENCY + storedTimeDeltaDifference);

    if (storedTimeDeltaDifference > SPINNER_THRESHOLD)

    {

      digitalWrite(SPINNER_PIN, HIGH);

    }

    else

    {

      digitalWrite(SPINNER_PIN, LOW);

    }

  }

  else

  {

    noTone(SPEAKER_PIN);

    digitalWrite(SPINNER_PIN, LOW);

  }

  if (digitalRead(RESET_BTN_PIN) == LOW)

  {

    storedTimeDelta = 0;

  }

}

float mapFloat(int input, int inMin, int inMax, float outMin, float outMax)

{

  float scale = (float)(input - inMin) / (inMax - inMin);

  return ((outMax - outMin) * scale) + outMin;

}

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15 days