Little help with tach connections?

[tobnpr]

Can't find a wiring diagram for the board, no idea which wire goes where...
I'm assuming the three wires are power, ground, and signal- which locations in the board do the brown, black and blue go?
I'm guessing the "+" adjacent to the square pinout is power?

 

[markba633csi]

I think it goes:
brn =1
blk =2
blu =3
Stick the wires in the holes first without soldering to test it
if it doesn't work try swapping blk and blu
-Mark

 

[ycroosh]

Can't find a wiring diagram for the board, no idea which wire goes where...
I'm assuming the three wires are power, ground, and signal- which locations in the board do the brown, black and blue go?
I'm guessing the "+" adjacent to the square pinout is power?

The documentation for the board is on the page where you placed the order: https://www.touchdro.com/store/diy-dro-igaging-scale-adapter.html#documentation

Tach connections are (left to right in your photo):
+3.3V (Vcc)
Signal
Ground

Your sensor is likely:
BN - Vcc
BK - Signal
BU - Ground

That said, I suspect that is an inductive proximity sensor, which will likely not work as a tachometer sensor. Very we of those can work off 5V, let alone 3.3V, and they have VERY slow response time. These are designed to semi-accurately detect proximity to a metallic object, and make pretty poor tachometer sensors.

Regards
Yuriy

 

[tobnpr]

Thanks, Yuriy.
It is a hall effect proximity sensor. Being ignorant on this "stuff"- I thought "hall effect" was "it".
It does specify 5-30v, I thought the board provided 5v.
Guess I'm in over my head here and I'll forget about enabling the tach function.
Everything I see for sale searching "hall effect tachometer sensor" turns up a digital display with a proximity sensor- same as what I already have.

 

[ycroosh]

You want a Hall effect sensor, but a different style. Something along these lines: https://amzn.to/3pFO2Oi
I'm working on a how-to guide that covers all this stuff, but it's roughly third on my current "To Do" list. I can PM you a link to the Google doc if you're interested (or just wait for a few weeks until I take the photos and post it to the site).

Thank you
Yuriy

 

[tobnpr]

I've had this one for a several years now, so a few weeks is no big deal.
I looked up the 49E sensor, looks like it functions essentially the same, magnetically (I've seen some that are optical?).
The board is pretty large and would present challenges in mounting with getting the sensor at the spindle, but I'm guessing the sensor can be dismounted from the board, and mounted remotely adjacent to the spindle.

First Touch-Dro I did from "scratch" many years ago when you first introduced it, second one was a Blu Dro before you started offering the assembled boards, and this last one a few years ago. Still have one more mill to outfit... thanks for a great product, and support.

 

[ric686]

You want a Hall effect sensor, but a different style. Something along these lines: https://amzn.to/3pFO2Oi
I'm working on a how-to guide that covers all this stuff, but it's roughly third on my current "To Do" list. I can PM you a link to the Google doc if you're interested (or just wait for a few weeks until I take the photos and post it to the site).

Thank you
Yuriy

I realize that you're probably busy with countless other things, but I was wondering if you're any closer to releasing the info on using the tach input. Looking at the 49E modules, there's an analog output, which I assume is directly from the 49E hall effect device, and a "digital" output, which I assume is the output of the onboard LM393 comparator. That output is high without a magnetic field and goes low when the 49E detects a field,
with the threshold set by the trim pot. From what I've read, the LM393 will operate at 3v if needed.
That leads me to some questions about connecting the module to the tach input:
Is the tach input buffered?
Does the tach input expect a 3.3v or 5v signal?
Does the Vcc pin at the tach input correspond to that?
Is the inverted logic of the comparator output an issue? I wouldn't think so since I expect that the tach input is probably just counting leading or trailing edges, but I could be totally wrong.
If the tach input doesn't require the signal conditioning of the comparator, could I get away with just using a 49E device without the extra circuitry on the module board?

Thanks!

 

[ycroosh]

Hi,
Tach inputs differ between different TouchDRO boards. The store listing for each board has the pinout diagram, pin descriptions, and inout ratings. In general,
Vcc is either 3.3v or 5V (Vcc is the "supply pin" by convention)
Gnd is "ground"

If your HALL effect sensor module has "digital" signal, use it instead of Analog, but as long as you can get output that has correct low/high thresholds, you can use it.

Regards
Yuriy