Digital Hobbyist

Re: ELS on a SOuth Bend 9

animal@... (mike allen) — Wed, 07 May 2025 16:25:49 -0700

Thanks John !

On 5/7/25 11:48 AM, BuffaloJohn via groups.io wrote:

Re: ELS on a SOuth Bend 9

johndurbetaki@... (BuffaloJohn) — Wed, 07 May 2025 11:48:41 -0700

You don't need a pull down for that hall effect sensor, you need a pull up. The output is the collector of an NPN transistor, so open collector.

There is a datasheet:

https://www.handsontec.com/dataspecs/sensor/NJK-5002C-Hall%20Sensor.pdf

Brown is supply to sensor.

Black is Open Collector output (if you don't put a pullup, it will only float up)

Blue is sensor ground

page 3 shows the schematic you would use, including a level shifter made of resistors to keep the output voltage in the range the processor needs. You can adjust the resistors to make the range be 0..3.1v if that is what you need.

Re: IR sensor help

bechetboat@... (John Lindo) — Wed, 07 May 2025 11:08:01 -0700

Nice looking job, well done.

John

Re: IR sensor help

bechetboat@... (John Lindo) — Wed, 07 May 2025 11:07:28 -0700

Hi John

Yes received the photos

Thanks

John

Re: IR sensor help

johnd@... (John Dammeyer) — Wed, 07 May 2025 10:50:28 -0700

Interesting. I sent two photos and neither of them showed up on the forum.

Re: IR sensor help

rhulslander@... (Ralph Hulslander) — Wed, 07 May 2025 10:37:48 -0700

Alex, would you share your code?

Re: ELS on a SOuth Bend 9

johnd@... (John Dammeyer) — Tue, 06 May 2025 23:58:03 -0700

There’s no specification on those devices as to speed. I would not use them as spindle sensors.

Re: ELS on a SOuth Bend 9

animal@... (mike allen) — Tue, 06 May 2025 23:37:50 -0700

we were gettin a ton of bounce with the sensor I originally picked . but I totally missed the part where i needed to use a pull down resistor . so maybe it get's better with the resistor .

https://www.amazon.com/dp/B01MZYYCLH?

thanks

animal

On 5/6/25 11:09 PM, John Dammeyer wrote:

Re: ELS on a SOuth Bend 9

johnd@... (John Dammeyer) — Tue, 06 May 2025 23:09:12 -0700

Here's a photo of my South Bend Heavy 10L with a magnet in the bearing clamp hole and a hall sensor to pick up the magnet. Been working without issues for probably since about 2008.

This is on a different lathe. Again easy to do.

ELS on a SOuth Bend 9

animal@... (mike allen) — Tue, 06 May 2025 18:38:38 -0700

hey folk's has anyone done this ELS on a South Bend 9 lathe ?

I'm lookin to see some pics of encoder mounting if anyone has any

thanks

animal

Re: IR sensor help

animal@... (mike allen) — Tue, 06 May 2025 18:28:41 -0700

thats why I couldn't find it , now I remember it was never saved in the file section , just in Messages .

thanks Julian

animal

On 5/6/25 6:11 PM, Julian wrote:

Re: IR sensor help

julian@... (Julian) — Tue, 06 May 2025 18:11:54 -0700

Mike, yes it's still up ... Auto-Oiler replacement for Myford and other drip oilers.

I too struggle to find historic stuff on groups IO.

Alex, yes, I did the same. I had a spare phase on my spindle encoder and used that. I made a lash-up system with a photo interrupter just to prove it worked and for the benefit of anyone building the system who didn't have an available encoder phase. I think the photo interrupters were only a couple of quid each and really easy to set up.

Re: IR sensor help

animal@... (mike allen) — Tue, 06 May 2025 17:06:55 -0700

A encoder sounds like a much more stable unit than a pair of led's readin line or 4 on a spinning shaft . Probably get much less bounce that way .

thanks

On 5/6/25 5:00 PM, alexphredorg wrote:

Re: IR sensor help

alex@... (alexphredorg) — Tue, 06 May 2025 17:00:38 -0700

I used an Omron rotary encoder to measure spindle location and speed on my lathe. The positioning is useful and enabled me to do an electronic leadscrew (a good project down the line). It's the thing attached with the orange belt below. They spin very freely, so you don't need much belt tension and this is one of the poly belts that you cut to length and melt together.

My encoder is 360 pulses per revolution and cost me under $20 on eBay in 2020. It looks like they might be $30ish now.

Alex

Re: IR sensor help

animal@... (mike allen) — Tue, 06 May 2025 15:55:21 -0700

Thanks Julian . I need something that can could revolutions on the spindle on my lathe . I looked for that project in the files this weekend but all I found was like 3 pics . Is it still there & I'm just messed up ?

thanks

animal

On 5/6/25 9:54 AM, Julian wrote:

Re: IR sensor help

peter.wilson@... (Peter Wilson) — Tue, 06 May 2025 10:02:47 -0700

Haven't used them yet but I settled on QRE1113 (through hole) for track sensors for a N Scale layout.

I only need to detect at about 3mm max. About 3.6 x 2.9 x 1.7 mm ...

Peter

On 6/05/2025 12:46 pm, mike allen wrote:

Re: IR sensor help

julian@... (Julian) — Tue, 06 May 2025 09:54:57 -0700

Hi Mike,

Not sure what type of IR sensor your looking for, but I used one of these on my auto oiler system a few years back ...

It was an H92B4 photo interrupter. It worked very well both for counting oil drips and with a small metal strip passing between the legs to measure rpm.

IR sensor help

animal@... (mike allen) — Mon, 05 May 2025 19:46:41 -0700

evening folks , Ion a quest for a small package IR sensor for a project
I'm working on .

Anyone here have a suggestion for one that they have used & are
happy with it ? I'm working with Arduino sized voltages .

thanks

animal

Re: anyone have one of these ?

johndurbetaki@... (BuffaloJohn) — Tue, 29 Apr 2025 08:36:28 -0700

oops, got an error in there - SDS1102 is the model you were looking at, but the answer remains the same, multiple brands, same comments apply...

Here is a reddit that talks about them:

https://www.reddit.com/r/AskElectronics/comments/isrb2z/opinions_on_these_oscilloscopes/

Last comment in the thread was interesting...

Re: anyone have one of these ?

johndurbetaki@... (BuffaloJohn) — Tue, 29 Apr 2025 08:26:32 -0700

The "DOS1102" part is the "standard" model name and there are multiple makers of that model. Standard chinese practice is there is a "design" and is branded by a bunch of trading companies. All are probably identical, though there are often lower priced versions that don't meet some spec. I found one on amazon for $170.

While non-recognisable brands might be a diamond in the rough, there is no way to tell. If you buy a name branded model, then you have a chance they have a reputation to look at.

If you are looking at waveforms and that is about it, you probably will find such a scope useful and satisfactory.

When I was in the market for a scope, I went with 4 channels and I am glad I did. I don't always need more than 2 channels, but when I do...