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Model: NJK-5002C
Supply voltage 5-30VDC
Detection distance 10mm (effective detection distance 0-10mm)
Load current 150MA (no more than)
Output form NPN three lines
Output state normally open (NO)
Detect objects metal material
Product Material Metal parts: Copper plastic components: PBT
External leads 1.2 m (standard, others according to customer requirements)
Output indication LED (red)
Factor Diameter: 12MM; Thread length: 12MM; Overall Length: 37MM
Package Include:
2* NJK-5002C Hall Effect Sensor Proximity Switch NPN 3-Wires Normally Open
Paul W.
Reviewed in the United States on May 10, 2024
These hall sensors perform as well as sensors costing much more.
William
Reviewed in the United States on November 27, 2023
It requires a magnetic field to change state. If a magnetic field is not involved -- NO WORKY PEOPLE! Magnets work well!
my3sons
Reviewed in the United States on August 1, 2022
Hall effect should trigger in with the proximity of any metal, it does not. It requires a magnet in the proper orientation to operate. Magnet is included. Operates like a reed switch. It also does not trigger at 10mm with the included magnet, its is more like 2mm.
Claire008
Reviewed in the United States on October 4, 2021
I'm currently using one of these to sense the state of my overhead garage door. It is behaving and functioning as a Hall Effect Proximity Sensor should. Each one comes with a small magnet for activation. I found a location where I could mount the sensor on a bracket the holds the garage door tracks. I just needed to enlarge a hole a bit to hold the sensor. I epoxied a magnet to the edge of the garage door where it would be aligned with the sensor when the door is closed. I have about 3/8" (about 9 - 10 mm) air gap between the magnet and sensor, and it is working fine.I have the sensor connected directly to the Raspberry Pi as follows:The sensor's brown wire connects to pin 2 of the GPIO header for the +5V supply.The sensor's blue wire connects to pin 6 of the GPIO header for the ground connection.The sensor's black wire connects to pin 8 (or any input of your choice -- configure your software to match.)The black wire/Pin 8 also needs to connect to a resistor (2200 - 4700 ohm is fine) and the other side of that resistor connects to pin 1 (3.3 V) of the Raspberry Pi GPIO connector. The black wire in the sensor provides an open-drain output, which means that it can provide a ground-level signal to pin 8 in one state, but to provide a voltage to pin 8 in the other state, you need to use the resistor (pull-up resistor) that connects to the Pi's 3.3V The Raspberry Pi inputs cannot tolerate more than 3.3 volts on an input pin.The specifications state that it has an NPN transistor output, and that configuration would be called open-collector, which in this application, works the same as the open drain output on what is clearly a FET: The on-state (conducting) voltage drop from black to blue wire was measured at about 20 millivolts.
Carlan Wray
Reviewed in the United States on October 27, 2020
This is a hall effect sensor, just not the kind some of the other commenters were looking for. A reed switch is not going to operate at the ~4kpps that I'm using mine for. This one requires an external flux source (magnet) rather than containing one internally that any ferrous object will interrupt. Thus the reason that it can detect at up to 10 mm, the other kind generally must be much closer, like ~2 mm.
Jack
Reviewed in the United States on October 1, 2020
Advertised as a Hall effect. It is not.Will not work without a magnet.(A.K.A reed switch)Works perfect as a reed switch.2 stars because of bogus description.
Clifton W. Sanchez
Reviewed in the United States on August 30, 2019
I like these sensors because they are sealed hall effect sensors. The cylindrical shape makes them easy to mount with just a drill. They respond to the south pole of a magnet.However, if you need to interface them to 3V logic, you need to level shift, current limit, or use a blocking diode.
PABen
Reviewed in the United States on December 27, 2019
Tested up to 4k RPM and accuracy was perfect. Only responds to one side of magnet so get your polarity right.
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