Re: Precision Piezo Z-probe Now available. December 16, 2018 10:12PM |
Registered: 6 years ago Posts: 7 |
Re: Precision Piezo Z-probe Now available. December 17, 2018 02:36PM |
Registered: 10 years ago Posts: 294 |
Re: Precision Piezo Z-probe Now available. December 19, 2018 07:24AM |
Registered: 5 years ago Posts: 5 |
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Moriquendi
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Ed3D
Ok sounds good to me. If you could stop making me want to buy more printer related things that would be great though
But then you wouldn't be giving me any money...
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Ed3D
I've only really briefly looked into the piezo - I assume there will be some good mount ideas kicking around on the internet. Ill be probing onto glass if that matters?
There are all sorts of mounts floating around but none so far for the threaded V6, however I'm about to start working on one. Glass is ideal for a piezo probe.
Idris
Re: Precision Piezo Z-probe Now available. December 19, 2018 09:04AM |
Registered: 10 years ago Posts: 294 |
Re: Precision Piezo Z-probe Now available. December 19, 2018 09:50AM |
Registered: 5 years ago Posts: 5 |
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ruggb
post a pic of your complete hotend carriage. The piezo requires very little movement to produce an output and maybe there is a solution.
Re: Precision Piezo Z-probe Now available. December 19, 2018 10:22AM |
Registered: 9 years ago Posts: 465 |
Re: Precision Piezo Z-probe Now available. December 19, 2018 11:02AM |
Registered: 9 years ago Posts: 487 |
Re: Precision Piezo Z-probe Now available. December 20, 2018 03:35PM |
Registered: 6 years ago Posts: 61 |
Re: Precision Piezo Z-probe Now available. December 20, 2018 04:07PM |
Registered: 9 years ago Posts: 487 |
Re: Precision Piezo Z-probe Now available. December 20, 2018 04:40PM |
Registered: 6 years ago Posts: 61 |
Orion module December 28, 2018 04:57PM |
Registered: 5 years ago Posts: 5 |
Re: Orion module December 29, 2018 06:04AM |
Registered: 9 years ago Posts: 487 |
Re: Orion module December 29, 2018 03:39PM |
Registered: 5 years ago Posts: 5 |
Re: Orion module December 30, 2018 05:34AM |
Registered: 9 years ago Posts: 487 |
Re: Orion module December 30, 2018 10:53AM |
Registered: 5 years ago Posts: 5 |
Re: Precision Piezo Z-probe Now available. December 30, 2018 11:15AM |
Registered: 9 years ago Posts: 487 |
Re: Precision Piezo Z-probe Now available. December 30, 2018 11:23AM |
Registered: 5 years ago Posts: 5 |
Re: Precision Piezo Z-probe Now available. December 30, 2018 11:32AM |
Registered: 9 years ago Posts: 487 |
Re: Precision Piezo Z-probe Now available. December 31, 2018 03:53PM |
Registered: 11 years ago Posts: 45 |
Re: Precision Piezo Z-probe Now available. January 01, 2019 12:47AM |
Registered: 10 years ago Posts: 294 |
Re: Precision Piezo Z-probe Now available. January 01, 2019 01:25AM |
Registered: 7 years ago Posts: 1,007 |
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ruggb
I suspect you have an open collector output that turns on (shorts) when active. Any resistor 10K or higher to a + voltage (whatever is supplying the board) will allow you to see a voltage change. The problem is it isn't latching and is a short duration (useconds) so you probably won't notice it on a meter. You need a scope.
Re: Precision Piezo Z-probe Now available. January 01, 2019 06:02AM |
Registered: 9 years ago Posts: 487 |
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ruggb
I suspect you have an open collector output that turns on (shorts) when active. Any resistor 10K or higher to a + voltage (whatever is supplying the board) will allow you to see a voltage change. The problem is it isn't latching and is a short duration (useconds) so you probably won't notice it on a meter. You need a scope.
Re: Precision Piezo Z-probe Now available. January 01, 2019 06:42AM |
Registered: 7 years ago Posts: 1,007 |
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Moriquendi
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ruggb
I suspect you have an open collector output that turns on (shorts) when active. Any resistor 10K or higher to a + voltage (whatever is supplying the board) will allow you to see a voltage change. The problem is it isn't latching and is a short duration (useconds) so you probably won't notice it on a meter. You need a scope.
This is correct, you need a >10k resistor to V+ to pull up the signal line. You will normally see some reaction using a multimeter but you probably wont see the actual lowest voltage reached (which will be very close to 0v).
The output is indeed open collector, the schematic refers to the Piezo20 board which does not use an open collector.
Idris
Re: Precision Piezo Z-probe Now available. January 01, 2019 08:17PM |
Registered: 10 years ago Posts: 294 |
Re: Precision Piezo Z-probe Now available. January 02, 2019 05:50AM |
Registered: 9 years ago Posts: 487 |
Re: Precision Piezo Z-probe Now available. January 02, 2019 07:08AM |
Registered: 7 years ago Posts: 1,007 |
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Moriquendi
There's a bit of confusion going on I think;
The older boards, the Piezo20 and older versions of the Universal and Orion drove the SIG pin directly from the opamp output. This is simple but has a couple of issues, namely that because the output of the opamp is also driving the LED there's a limit to how low the opamp can pull the SIG pin.
The latest versions of the Universal PCB use an open collector mosfet to pull the SIG pin low and a separate mosfet to drive the LED. There are two advantages to this; The SIG pin can be pulled to 0v and, if required, the board can be supplied from a higher voltage than the controller (Ramps/Duet etc) can tolerate.
I don't think you can call the output of an opamp tri-state. To my understanding, tri-state implies that the pin can be high, low or high-impedance where no voltage is driven and the pin follows the voltage of the circuitry connected to it, ie, it's an input. I have only run into tri-state pins in digital circuits, eg microcontrollers where pins can be either inputs or outputs.
I would describe the output stage of the opamp (N4 and N5) as push-pull.
Idris
Re: Precision Piezo Z-probe Now available. January 04, 2019 03:50PM |
Registered: 6 years ago Posts: 43 |
Re: Precision Piezo Z-probe Now available. January 04, 2019 06:17PM |
Registered: 10 years ago Posts: 294 |
Re: Precision Piezo Z-probe Now available. January 04, 2019 08:29PM |
Registered: 6 years ago Posts: 43 |
Re: Precision Piezo Z-probe Now available. January 05, 2019 03:22AM |
Registered: 9 years ago Posts: 487 |