Simple Metal Detector Using Arduino

What Will I Learn?

You will learn how to use a KY-036 metal touch sensor.

You will learn how to integrate the KY-036 metal touch sensor with the arduino uno board.

You will learn how to program the arduino uno to make use of the metal touch sensor module.

This is a simple project that utilizes the use of a metal touch sensor with the arduino uno board. The metal touch sensor is connected to the arduino uno board as the input to detect any electrical connectivity (i.e. human body) and the LED & buzzer are the outputs. Once the sensor is touched by a conducting body, It will trigger the switch then sends that data into the arduino uno board and thus turning the LED & buzzer on .

Hardware:

Arduino Uno

Metal touch sensor( KY-036)

LED

Resistor(220 ohms)

Breadboard

Jumper wires

USB type A to B cable

Computer

Software

Arduino IDE

Connect the LED

Connect the anode(+) of the LED to a 220 ohm resistor that is connected to pin number 7 of the arduino uno board. This resistor will protect the LED from over supply of current.

Connect the cathode(-) of the LED to the common ground.

Connect the sensor
Connect the + pin of the metal touch sensor to the voltage source(+) in the breadboard.

Connect the GND pin of the metal touch sensor to the common ground(-) in the breadboard.

Connect the D0 (digital pin) of the metal touch sensor to pin number 9 of the arduino uno board.

connect the buzzer

connect the buzzer + pin to pin number 8

connect the buzzer - pin to pin number GND

int ledpin = 7 ; // sets the LED @pin 7 

int touchpin = 9; // sets the KY-036 metal touch sensor @pin 9 

int buzzer= 8; 

int value ;         // defines the numeric variables as value

 void setup () {   pinMode (touchpin, INPUT) ; // sets the metal touch sensor as INPUT   

pinMode (ledpin, OUTPUT) ; // sets LED as the OUTPUT   

pinMode (buzzer, OUTPUT); } 

void loop () {   value = digitalRead (touchpin) ; // reads the value of the touchpin   

if (value == HIGH)      // If the value is HIGH    

{     digitalWrite (ledpin, HIGH);   // It will turn the LED ON, indicating that the sensor has been triggered    

 digitalWrite (buzzer, HIGH);   }   else        //otherwise   

{     digitalWrite (ledpin, LOW);  // LED is turned off if sensor is not triggered     

 digitalWrite (buzzer, LOW);   } }