Inductive Sensor: Difference between revisions
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=OSE Use Case= | =OSE Use Case= | ||
*'''OSE currently uses the LJ18A3-8-Z/BY-5V sensor''' | *'''OSE currently uses the LJ18A3-8-Z/BY-5V sensor'''. Sourcing - [https://www.aliexpress.com/item/32718397681.html?spm=2114.search0104.3.2.5c786d64XyNwAB&ws_ab_test=searchweb0_0,searchweb201602_2_10065_10068_204_10130_5727215_318_10547_10546_10059_10884_10548_5727315_10545_10887_10696_100031_10084_10083_10103_10618_452_10307_532,searchweb201603_60,ppcSwitch_0&algo_expid=3db8b377-2748-4424-801c-b2eba9d9e56d-0&algo_pvid=3db8b377-2748-4424-801c-b2eba9d9e56d&transAbTest=ae803_4&priceBeautifyAB=0] | ||
*This allows for a longer sensing distance, which is useful for larger machines (1 meter bed and larger) | *This allows for a longer sensing distance, which is useful for larger machines (1 meter bed and larger) | ||
Revision as of 02:51, 15 October 2019
OSE Use Case
- OSE currently uses the LJ18A3-8-Z/BY-5V sensor. Sourcing - [1]
- This allows for a longer sensing distance, which is useful for larger machines (1 meter bed and larger)
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 - so can be powered from the RAMPS board directly
- 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
- See part numbers and what they mean at Aliexpress - [2]
The BX vs BY is NPN vs PNP Detection - appears wiring will be different
How to wire LJ18A3-8-Z/BX-5V vs Z/BY?
Notes
- For normally open, Z_MIN_ENDSTOP_INVERTING in configuration.h of Marlin should be set to false? See [3]
- NPN vs PNP - [4]
- See D3D BOM for sourcing.
- See D3D Height Controller for design