LJ12A3-4-Z / EX Inductive Proximity Switch

Description

What it is

LJ12A3-4-Z / EX is a proximity inductive switch, used to detect the presence of metallic objects. This device can be integrated into various electronic projects such as security systems or automatic sensors.

Features

• Type: Proximity inductive switch
• SKU: ARD0010867

What it is for

The LJ12A3-4-Z / EX switch is ideal for projects requiring the detection of metallic objects. It can be used in alarm systems, home automation, or any application where the approach of a metallic object needs to be detected.

Tutorial: How to use LJ12A3-4-Z / EX Proximity Inductive Switch

The proximity inductive switch LJ12A3-4-Z / EX is ideal for controlling the approach to metallic materials. Useful for projects requiring a presence sensor.

What you need

• LJ12A3-4-Z / EX
• Arduino
• Resistor (1 kΩ)
• Power cable

Steps

1. 1. Connect the power supply to the VCC and GND pins of the switch.
2. 2. Connect the resistor between the VCC pin and the OUT pin.
3. 3. Connect the GND pin of the switch to the GND of the Arduino.
4. 4. Connect the OUT pin of the switch to a digital pin of the Arduino (e.g., D2).
5. 5. Load the code below.
6. 6. Verify the power supply specifications in the datasheet.
7. 7. Try bringing a metallic object close to the switch.
8. 8. Check the state change of the digital pin.

Example code

const int sensorPin = 2;
int sensorValue = 0;

void setup() {
  pinMode(sensorPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  sensorValue = digitalRead(sensorPin);
  Serial.println(sensorValue);
  delay(1000);
}

Mini project

Build an alarm system for doors with the proximity switch. Connect the switch to pin D2 of an Arduino and to an LED. When a metallic object approaches, the LED turns on.

Common mistakes

• Do not verify the power supply specifications in the datasheet.
• Connect the switch without a resistor.
• Do not use a digital pin as a read pin.
• Forget to install the code on the Arduino.

Recommended accessories

• LED
• Resistor (220Ω)
• Arduino UNO

Frequently asked questions

Which metallic materials work with the switch?
Works with all metallic materials, including steel and aluminum.

Can it work with non-metallic materials?
No, it only works with metallic materials.

How long does the battery last?
Check the datasheet for power supply specifications.

Can I use the switch with an Arduino Nano?
Yes, it is compatible with all types of Arduino.