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Stumped about my Hall effect limit switches

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billbyrd1945:
Instead of 12v I went ahead and used the 36v from my main power supply. Made the sensor lights much brighter of course. But still no trigger action. So far, the closest I've come to success was the 8 relay block. But it does have that one problem mentioned in my original post. And, of course, the primitive mechanical micro switches that I used for several years worked. But they were so crappy looking. I really would like to get this to work. No moving parts, nice clean look.

thm_w:
Really good diagrams  :-+

So you are measuring the voltage on the Y connector of the breakout board, with the hall connected to that input, and when it switches it drops to 0.08V. And no signal status change is seen in Mach3 diagnostics screen?
Now if you instead take Y input and short it to ground with a wire or switch, the input does change in Mach3? Or still doesn't work.

If it still does not change, then we need to diagnose other parts of the system:
- opto output
- parallel port input to PC
- etc

Since these were working before, it makes it hard to think they stopped working.
Although, I have had to change the parallel port address a few times in mach settings. If no input pins at all are triggering this could be the case.

billbyrd1945:
I got so angry today, I just laid down my tools and walked away. I'm 74y/o yet, I feel like a four year old trying to figure out how to put a couple of D batteries in a flashlight. So I'm going to replace all the sensors with mechanical micro switches just to make sure I even know how to set up home and limit switches on the most primitive level. Then I'll come at it again one axis at a time with sensors. I do appreciate all the advice.

mikerj:

--- Quote from: billbyrd1945 on May 03, 2020, 03:14:44 pm ---Per advice from various respondents, I removed the relays altogether and wired it as they recommended. Pics with values attached. As the magnets passed the sensors, the lights in the sensors came on and the voltage changed from 3.75v to 0.08v but no alarms were triggered, like the sensors weren't even there. As far as I could tell, there was nothing happening on the diagnostics screen with or without the sensor activated. The saga continues.

--- End quote ---

In this scenario when you measured 3.75volts, was the output of the hall sensor (i.e. green wire) also connected to one of the limit switch inputs rather than just the volt meter?  The Halls sensors have open collector outputs, so they need something to pull them up when not active.

If they sensor are pulling the X/Y/Z limit inputs down to zero volts and you still aren't seeing anything then it sounds like the problem lies elsewhere.  If you connect the limit inputs to ground with a piece of wire do you see the alarm?

billbyrd1945:
"...was the output of the hall sensor (i.e. green wire) also connected to one of the limit switch inputs..."
Yes. I back-probed the connector with the sensors connected to the breakout board.

I put together a playlist consisting of 5 very short videos to show what's going on. Maybe this will help:

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