Inductive Sensor: Difference between revisions
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Part numbers look like LJ18A3-8-Z/BY-5V for the 2018 D3D with LCD screen - where we use the 8 mm distance sensing to facilitate the sensor not hitting the print bed. | Part numbers look like LJ18A3-8-Z/BY-5V for the 2018 D3D with LCD screen - where we use the 8 mm distance sensing to facilitate the sensor not hitting the print bed. | ||
*5V is the critical part - 5V | *5V is the critical part - 5V '''input''' | ||
*LJ18 - the 18 refers to the diameter of the sensor in mm | *LJ18 - the 18 refers to the diameter of the sensor in mm | ||
*-8- refers to the distance of sensing | *-8- refers to the distance of sensing | ||
*Z/BY refers to normally open vs normally closed | *Z/BY refers to normally open vs normally closed | ||
=Tom's Guide 1= | =Tom's Guide 1= | ||
*Mentions 12v sensor with voltage divider. Video description sources the 5V sensor | *Mentions 12v sensor with voltage divider. Video description sources the 5V sensor | ||
Revision as of 20:39, 6 June 2018
Introduction
Inductive sensors are used to sense the Z height on 3D printers. For Marlin with RAMPS - use one that has a 5V output, as opposed to 12V, as RAMPS cannot handle 12V without using additional components.
Part numbers look like LJ18A3-8-Z/BY-5V for the 2018 D3D with LCD screen - where we use the 8 mm distance sensing to facilitate the sensor not hitting the print bed.
- 5V is the critical part - 5V input
- LJ18 - the 18 refers to the diameter of the sensor in mm
- -8- refers to the distance of sensing
- Z/BY refers to normally open vs normally closed
Tom's Guide 1
- Mentions 12v sensor with voltage divider. Video description sources the 5V sensor
Tom's Guide 2
- Comparison - essentially, all distance sensing capacitive sensors are quite good.
Samples
- From Aliexpress -
- 3 Wire Polarity: NPN Detection
- Voltage: DC 5V
- Ouput Status: Normally Open
- Part number: LJ18A3-8-Z/BX
The BX vs BY is NPN vs PNP Detection - appears wiring will be different
How to wire LJ18A3-8-Z/BX-5V?
Notes
- For normally open, Z_MIN_ENDSTOP_INVERTING in configuration.h of Marlin should be set to false? See [1]
- NPN vs PNP - [2]
- See D3D BOM for sourcing.
- See D3D Height Controller for design