Re: Connecting electronic probe to Mach3
Originally Posted by
kawazuki
Hi All - tried this thread in the Mach Forum with not much response so i'm putting it to you guys!
I just got a nice Chinese Reinshaw type kinematic probe for not a lot of money and I'd like to confirm if my understanding of how to wire it into Mach 3 won't fry anything ! ! !
A picture of its wiring is below. I'm fine with its voltage supply and likewise its earth - its the output i'm unsure about. Mach 3 input for 'normal' kinematic probes is a closed / NC circuit
until it bumps into something when it goes open / NO circuit thus triggering a stop. This probe is powered and will be outputting a voltage in its 'normal state? And when triggered the
output will go low as its connected to ground, as suggested by the diagram?
So question is - will the Mach3 input object to being 'fed' a voltage all the time until triggering occurs when it will go low (although not to ground potential?)
I'm planning of using a 5 or 7.5v power source if it makes a difference.
Hi,
You need to power it off a voltage compatible with the breakout board you are connecting it to. If it is a 5v non isolated input, then you need to power the probe of 5V. Otherwise you could damage the breakout board if you feed it with 7.5V.
Assuming the circuit below is accurate, the probe is a N/O (normally open) probe. When active the input will be at 0V.
This is not preferable as Mach3 won’t know if the probe is connected or not. With a N/C type probe, if it is not plugged in or a wire breaks, Mach3 will see the input as active and won’t start to run a probing routine.
With a N/O Probe switch, Mach3 will not know the probe is not plugged in, start the probe routine and crash the probe.
Cheers,
Peter
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