LJ12A3-4-Z/BX Inductive Proximity Sensor Switch NPN DC 6V-36V
What is an inductive proximity sensor?
Inductive proximity sensors are used to detect the presence or absence of metal objects.
When the sensor detects a metal object, its electrical output changes state (ON/OFF), similar to a switch.
The LJ12A3-4-Z/BX NPN sensor has an indicator LED that lights up when it detects a metal object within its detection range.
The LJ12A3-4-Z/BX (NPN-NO) inductive proximity sensor allows you to detect metal objects within a range of 4mm.
This allows you to accurately measure the distance to an (aluminum) heated bed for example.
As it is a non-contact sensor, its durability is very extended compared to other types of sensors such as switches or mechanical switches.
Furthermore, since it is a completely sealed element, it is very little susceptible to water or dust, which can affect the optical and/or mechanical sensors.
Proximity sensor that detects nearby metal, including aluminum foil a great solution for heated bed calibration.
The sensor has an M12 threading and includes a nut for easy mounting to your 3D printer or CNC machine.
Easy integration with digital systems such as Arduino, Pics or PLCs.
It is only necessary to connect the sensor output to a digital input of the microcontroller.
The output of this sensor is normally open NPN type, so when an object is detected the output will be GND and in the rest state VCC.
The LJ12A3 is a NPN Normally Open (NO) type of proximity sensor, which means when nothing is detected the resistance on the black wire is high.
Upon detection the resistance will be low and connects to ground.
Use the internal pull-up on your Arduino.
Note
This sensor operates at 6-36V, so as the signal voltage is the same as the input voltage, also the signal will be 6-36V.
You will need to down-convert the voltage to acceptable level for your electronics.
Put a 10K resistor between the black signal line and your 5V electronics input to avoid damage
Features
• Name : Inductive Proximity Switch
• Model : LJ12A3-4-Z/BX
• Wire Type : DC 3 Wire Type (Black, Brown, Blue)
Brown : (VCC) 6 – 36V DC
Black : NPN output NO
Blue : GND
• Switch Appearance Type : Cylinder Type
• Theory : Inductive Sensor
• Output Type: NPN-NO Switch (NPN Normally Open Three-line)
• Diameter of Head : 18mm
• Detecting Distance : 4mm
• Supply Voltage : DC 6-36V
• Current Output : 300mA
• Detect Object : Iron
• External Material : Plastic, Alloy
how to connect this sensor to the Arduino board and make a metal detector: LJ12A3-4-ZBX
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