Inductive Proximity Sensor Detection Switch LJ12A3-4-Z/BY (PNP) Normally Open เซนเซอร์ตรวจจับโลหะ ระยะสูงสุด 4mm

• Type: LJ12A3-4-Z/BY
• Size: M12x55mm 
• Output: PNP three wire normally open type
• The detection distance: 4 mm
• Supply voltage: 6-36VDC
• Output current: 300 mA
• Objects can be detected: Metal
• Wiring: 
  • Brown -> +5V Power
  • Blue -> GND
  • Black -> Output Signal

INTRODUCTION:

In this tutorial, we will learn about the LJ12A3-4-Z/BX sensor, what is an inductive proximity sensor and we will build a simple project using the LJ12A3-4-Z/BX sensor and an Arduino.

INDUCTIVE PROXIMITY NPN SENSOR LJ12A3-4-Z/BX:

The LJ12A3-4-Z/BX Module will be our main component for this tutorial. This module has a stainless steel threaded body with 3 wires for connection. Figure 1 shows the module as seen in fritzing.

PIN OUT:

The LJ12A3-4-Z/BX module has three wires.

WHAT IS A INDUCTIVE PROXIMITY SENSOR?

An inductive proximity sensor uses current-induced magnetic fields to detect nearby metal objects.

PROJECT – ARDUINO METAL DETECTOR:

Our project will use the LJ12A3-4-Z/BX sensor and turn on a relay when it detects a metal object nearby.

PROJECT COMPONENTS:

For this project, we need the following components:

• Arduino Uno board (1 pc.)
• LJ12A3-4-Z/BX Inductive Proximity NPN Sensor (1 pc.)

WIRING DIAGRAM:

Figure 2 shows the connection between the Arduino Uno and the LJ12A3-4-Z/BX Inductive Proximity NPN Sensor.

The LJ12A3-4-Z/BX module pins are connected to the Arduino Uno board as follows:

 
CODE:

Below is the Arduino sketch for our project. I have added comments to explain important parts of the code. Save the code proximity_sensor.ino and upload it to your Arduino board.

// Arduino and proximity sensor

void setup ()
{
Serial.begin(9600); // initialize serial
}

void loop ()
{
Serial.print("Analog pin: "); // display analog values to serial
Serial.print(analogRead(A0));
}