[vc_row][vc_column][vc_column_text]Linker magnetic switch works as a regular mechanical switch:  it turns a circuit on or off depending on the position of the mechanical arm. The only difference is that the status of a magnetic switch is controlled by a presence of  a magnet, rather than a mechanical force.

[/vc_column_text][/vc_column][/vc_row][vc_row][vc_column width=”1/1″][vc_tour][vc_tab title=”Parts list” tab_id=”1393999330-1-2″][vc_column_text]We need the following parts:

1.  1 x Linker Magnetic Switch Module
2. Several male to female jumper wires
3. 1 x pcDuino2

[/vc_column_text][/vc_tab][vc_tab title=”Wiring diagram” tab_id=”1393999330-2-72″][vc_column_text]We wire the parts according to the following way:

1. SIG of Linker Magnetic Switch module -> Digital 9 of pcDuino2

[/vc_column_text][/vc_tab][vc_tab title=”Sample Code” tab_id=”1394000971671-2-9″][vc_column_text]GPIO class code:

package com.test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class GPIO_Pin {

    private String modeURI = "/sys/devices/virtual/misc/gpio/mode/";
    private String statusURI = "/sys/devices/virtual/misc/gpio/pin/";
    private int pin = 0;
    public static final String HIGH = "1", LOW = "0", INPUT = "0", OUTPUT = "1", INPUT_PU = "8";

    public GPIO_Pin(int pin) {
        modeURI += "gpio" + pin;
        statusURI += "gpio" + pin;
        this.pin = pin;
    }

    public GPIO_Pin(String pin) {
        // Finalize file paths
        modeURI += "gpio" + pin;
        statusURI += "gpio" + pin;
        this.pin =Integer.parseInt(pin);
    }

    public int getPin() {
        return pin;
    }

    public void overrideURI(String uri) {
        modeURI = uri + "mode/gpio" + pin;
        statusURI = uri + "pin/gpio" + pin;
    }

    public void setMode(String mode) {
        writeToFile(getModeURI(), mode);
    }

    public void set(String state) {
        writeToFile(getStatusURI(), state);
    }

    public void setHIGH() {
        writeToFile(getStatusURI(), HIGH);
    }

    public void setLOW() {
        writeToFile(getStatusURI(), LOW);
    }

    public void setModeINPUT() {
        writeToFile(getModeURI(), INPUT);
    }

    public void setModeOUTPUT() {
        writeToFile(getModeURI(), OUTPUT);
    }

    public void setModeINPUT_PU() {
        writeToFile(getModeURI(), INPUT_PU);
    }

    public String getModeURI() {
        return modeURI;
    }

    public String getStatusURI() {
        return statusURI;
    }

    public String getPinMode() {
        try {
            BufferedReader reader = new BufferedReader(new FileReader(getModeURI()));
            String data = reader.readLine();
            reader.close();
            return data;
        } catch (IOException e) {
        }
        return "";
    }

    public String getPinStatus() {
        try {
            BufferedReader reader = new BufferedReader(new FileReader(getStatusURI()));
            String data = reader.readLine();
            reader.close();
            return data;
        } catch (IOException e) {
        }
        return "";
    }

    private void writeToFile(String URI, String data) {
        try {
            File file = new File(URI);
            file.delete();
            File newFile = new File(URI);
            newFile.createNewFile();
            FileWriter writer = new FileWriter(URI);
            writer.write(data);
            writer.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

Test Code:

package com.test;

public class test {
    public static void main(String[] args) throws InterruptedException {
        // TODO Auto-generated method stub
        GPIO_Pin buttenpin=new GPIO_Pin(9);
        buttenpin.setModeINPUT();

        while (true) {
            if("1".equals(buttenpin.getPinStatus())){
                System.out.println("Enter the magnetic field !");
            }else{
                System.out.println("In the magnetic field !");
            }                                                                   
            Thread.sleep(400);
            }
    }

}

[/vc_column_text][/vc_tab][vc_tab title=”Test Results” tab_id=”1394000972884-3-7″][vc_column_text]The status of the Linker magnetic switch module will be different depending on the presence of the magnet or not:

[/vc_column_text][/vc_tab][/vc_tour][/vc_column][/vc_row]