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Author Topic: ess probe sanity check  (Read 210 times)

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ess probe sanity check
« on: April 27, 2019, 08:44:12 AM »
so I'm have an ess and a c25 with probe . It is powered by a 2 amp 5 volt supply , both ess and c25 are powered by it . I'm not sure why when I connect probe signal pin 13 port 2 to ground it doesn't show tripped in mach . The probe checks out with a meter .  the ess and mach are configured for that pin name to probe . anything I missed ?

Offline MN300

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Re: ess probe sanity check
« Reply #1 on: April 27, 2019, 09:00:35 AM »
The CNC4PC C25 manual asks for a 4.7K pull-up resistor from the probe input to +5V, have you installed one?
Re: ess probe sanity check
« Reply #2 on: April 27, 2019, 09:12:51 AM »
That is just the jumper that is moved from what I understand or could be the issue

Offline MN300

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Re: ess probe sanity check
« Reply #3 on: April 27, 2019, 09:33:01 AM »
If there is a pull-up resistor connected the input will measure 5V with the probe not grounded and 0V when the probe is grounded.
Re: ess probe sanity check
« Reply #4 on: April 27, 2019, 09:37:19 AM »
It just decided to work after pulling the probe apart and reassembling.  I still don't get why jumping pins to ground wouldn't work ?

Offline reuelt

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Re: ess probe sanity check
« Reply #5 on: April 27, 2019, 02:58:03 PM »
It just decided to work after pulling the probe apart and reassembling.  I still don't get why jumping pins to ground wouldn't work ?
The C25 inputs pins (unlike many BOBs) are ACTIVE HIGH types - meaning they are already grounded with 4.7K resister internally. Jumping pins to ground wouldn't work, You have to jump pins to 5V (& not Gnd) for it to work.
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Re: ess probe sanity check
« Reply #6 on: April 27, 2019, 03:01:07 PM »
Good to know ! All is working now !