Inductive Sensor: Difference between revisions
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=Notes= | =Notes= | ||
*For normally open, Z_MIN_ENDSTOP_INVERTING should be set to false? See [http://www.instructables.com/id/Enable-Auto-Leveling-for-your-3D-Printer-Marlin-Fi/] | |||
*NPN vs PNP - [https://sensortech.wordpress.com/2011/01/18/industrial-sensing-fundamentals-%E2%80%93-back-to-the-basics-npn-vs-pnp/] | *NPN vs PNP - [https://sensortech.wordpress.com/2011/01/18/industrial-sensing-fundamentals-%E2%80%93-back-to-the-basics-npn-vs-pnp/] | ||
*See [[D3D BOM]] for sourcing. | *See [[D3D BOM]] for sourcing. | ||
*See [[D3D Height Controller]] for design | *See [[D3D Height Controller]] for design | ||
Revision as of 20:23, 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 output
- 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
- Detection Distance: 4mm
- Ouput Status: Normally Open
- Output current: 300mA
- Detection objects: Conductor
- Part number: LJ18A3-8-Z/BX
Notes
- For normally open, Z_MIN_ENDSTOP_INVERTING should be set to false? See [1]
- NPN vs PNP - [2]
- See D3D BOM for sourcing.
- See D3D Height Controller for design