[ger21]

Roman hasn't been here for a few years now, unfortunately.

[Al_The_Man]

Hello Roman,
Could you please reply;
Mike

Yes, he has been also absent from other forums he belonged to since around 2013, also his web site has not been updated since then. https://www.romanblack.com/
Al.

[john-100]

Hi mike

how close the magnet need to be to switch on a normally open HAL switch like the SS441
depends on how powerful a magnet is and the minimum flux density to switch on as specified on the data sheet


typical values for SS441
switches on at 85 gauss
switches off at 40 gauss
hysteresis 45 gauss

if the magnet is too strong
you could use a magnetic shunt to weaken the magnetic field to reduce the gap between the switch and magnet when it switches on
Roman advised against using super magets because they are too powerful !

John

[Mike58]

Strange - I see this>:

[ger21]

That's not Roman.

[Mike58]

Well Noted - thanks.
Mike

[Al_The_Man]

Strange - I see this

See Post #1 of the thread!!
Al.

[Torchhead]

I have a question: What happens when the magnets scarf up all the metal shavings and or plasma dust ? I have seen mag sensors used but it was on an engraving machine used for wood and plastic and the positions were covered I kinda like light instead of magnetism. Hall sensors are really good to sense current flow in a conductor.

[ger21]

I have a question: What happens when the magnets scarf up all the metal shavings and or plasma dust ?

We're using them on routers, where this isn't an issue.

[x2df]

PM sent Mike58

Ya, sorry, I took the website down, it was costing me too much.

I too have not heard from Romanlini or seen him around.

Routers cut wood, plastic, aluminum, and brass. These tend not to be magnetic, so they don't stick to the magnets. The switches can be used for other things too, this design Romanlini came up with can be used for many things, for instance, hooking it to an Arduino based home made robot or something. Even 3D printer or laser etching/engraving machine.

I had one of those cheap Chinese 40W laser engravers, and added these switches to it instead of those crappy micro switches they have, big improvement. Although I ended up selling the machine, as the extruded rails ended up warping. Those machines are so cheaply made.

It's a fairly simply design, yet when configured correctly, can be extremely accurate for repeat-ability, as there are no moving mechanical parts.

[Joz]

Hi
Could someone help me with wiring these switches - I have the Honeywell SS451A's
I'm easily confused and not electronically minded - a bad combination
I have a HG08 breakout board from www.cnc4you.co.uk
It provides 5V+ and five inputs. My understanding is
1. connect the + tag to the 5v+ from the HG08
2. connect the Out tag to one of the HG08's inputs

I'm confused by:
A. Where do I connect the middle (ground) tag?
B. If I understand it right, these switches are Normally Open (with magnet absent) - does it not need to be Normally Closed, then when the magnetic field is present, Open?

Spent all morning trying to work out what I'm sure is dead simple - if someone could help it would be appreciated.
Data sheet for HG08 BOB is on www.cnc4you.co.uk website if that helps
thanks in advance
Joz

[Joz]

Ok I've sorted it. Read through the earlier pages carefully, fitted the correct resistor, all sorted.

[Mr.Chips]

If you have an internal pull-up resistor (which pulls up the input high when there is no load) don't use that for anything else. Connect a separate resistor for the LED, that would be for example between Out & the LED (-).

So does that mean it will in essence be a NC switch, I understand this is the preferred condition. Please explain as I’m a noob in electronics. I will be putting switches on each home, limit . Using G540 and Smoothstepper with C25S BOB so I have more than enough inputs. Thanks

[Al_The_Man]

If using the SS441 based units then they are open collector transistor output, and require a magnetic field to operate. or turn on the output.

[Mr.Chips]

Yes I know, the way the fellow in the previous note stated it it seemed his setup of the Hall effects it was a NC condition when it was not activated.
Guess I have to live with the NO state, it will still work.
Thanks
I had purchased Hall effect switches and so far I haven’t got them to work in a test case, maybe I need to go with this more simple method.

[Al_The_Man]

The SS400 series need a pull up resistor from output to 5v+, if not provided.
5k to 10k

[Mr.Chips]

The SS400 series need a pull up resistor from output to 5v+, if not provided.
5k to 10k

So that’s the resistor beside the sensor i see embedded?

[Al_The_Man]

There has been many posts, but see post #13 for Romans set up and the resistor.

[Mr.Chips]

Thanks Al, I really appreciate all this information it’s going to make my job a lot easier.
Is there an easy way to print out all the information at one time, rather than highlight a section at a time?

[Algirdas]

to print out all the information at one time

depends on your browser. Generally, right click the mouse and choose "save page as ..."