Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? August 19, 2015 12:54PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? August 21, 2015 03:29AM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? August 21, 2015 01:50PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? September 09, 2015 03:47PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? September 09, 2015 04:03PM |
Registered: 10 years ago Posts: 41 |
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Andy1989
Its finaly arrived!
Iv wired my LJC18A3-H-Z/BX to 5V and it appears to work okay, and will detect my glass bed from about 2mm with the sensitivity turned right up to maximum.
Iv also tried using it with a 9V battery and its a lot more sensitive.
Will post again when i get it installed on the printer.
Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? September 11, 2015 12:05PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? September 11, 2015 12:30PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? September 11, 2015 12:36PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? September 14, 2015 03:43PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? September 14, 2015 03:50PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 02, 2015 05:15PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 02, 2015 05:49PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 03:27AM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 03:46AM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 04:12AM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 10:41AM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 04:27PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 04:59PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 05:16PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 05:18PM |
Registered: 10 years ago Posts: 41 |
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David J
Or use an IR sensor, as sold by dc42.
I use one on my Prusa to print onto glass - the only extra that's sometimes needed is a sheet of black paper or card under the glass to minimise false reflections. It works well.
Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 05:24PM |
Registered: 10 years ago Posts: 14,685 |
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NarimaanV
...but because my current setup is PCB heater and glass, my options are limited to either a physical switch attached to a servo or sled (which having the switch move creates room for error) or a capacitive proximity sensor, which is why I'm trying the latter.
Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 05:33PM |
Registered: 10 years ago Posts: 41 |
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dc42
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NarimaanV
...but because my current setup is PCB heater and glass, my options are limited to either a physical switch attached to a servo or sled (which having the switch move creates room for error) or a capacitive proximity sensor, which is why I'm trying the latter.
You have more options than that, including infrared. See [miscsolutions.wordpress.com]. This is the sensor that E3D has chosen for their BigBox 3D printer. [Full disclosure: mentioned my own stuff.]
Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 06:05PM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 06:08PM |
Registered: 10 years ago Posts: 41 |
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zerodameaon
Ran that M48 as requested. Here are the results at 3pm and it's roughly 80 degrees in the house with the bed at 90*. I will update this as the house cools down.
15:03:36.607 : Mean: -9.245626
15:03:36.607 : Standard Deviation: 0.002183
Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 06:29PM |
Registered: 10 years ago Posts: 14,685 |
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NarimaanV
EDIT: Sorry, and correct me if this is a mistake, but isn't E3D using a conventional mechanical switch on a servo? Extreme Auto-Levelling with the Bigbox 3DP
Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 03, 2015 07:24PM |
Registered: 10 years ago Posts: 41 |
Ahhh I see, very niceQuote
dc42
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NarimaanV
EDIT: Sorry, and correct me if this is a mistake, but isn't E3D using a conventional mechanical switch on a servo? Extreme Auto-Levelling with the Bigbox 3DP
They were going to include the servo deployed switch as standard and offer my differential IR sensor as part of the sensor upgrade package, but they recently informed me that they will include the IR sensor as standard.
Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 04, 2015 07:39AM |
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Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 04, 2015 09:37AM |
Registered: 10 years ago Posts: 41 |
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JBFUK
After using an inductive sensor with an aluminium plate for a bit I really wanted to go back to glass. Accidentally ordered a higher range (but still inductive) sensor. Waiting for LJC18A3-H-Z/BX to be delivered by Amazon today. Do I understand correctly that I can wire this directly in to 12v with no voltage divider on the i/o wire going to the RAMPS board (using a two resistor divider with my current inductive sensor)?
Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 04, 2015 09:43AM |
Registered: 9 years ago Posts: 517 |
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NarimaanV
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JBFUK
After using an inductive sensor with an aluminium plate for a bit I really wanted to go back to glass. Accidentally ordered a higher range (but still inductive) sensor. Waiting for LJC18A3-H-Z/BX to be delivered by Amazon today. Do I understand correctly that I can wire this directly in to 12v with no voltage divider on the i/o wire going to the RAMPS board (using a two resistor divider with my current inductive sensor)?
So there's some tricky business there. Theoretically, no, you shouldn't need any. The sensor's output drops from floating to ground. To prevent the floating, you could theoretically have the output tied via a pullup resistor to 5V, but me still learning electronics, I don't know if it has any negative consequences to have the sensor wired to 12V for power and the output wired to 5V via pullup. Could be absolutely fine, but again, I don't know for sure, maybe someone who does can clarify this.
But in case it's bad to wire the output to 5V via pullup and instead better to wire it to the same supply voltage of 12V, then you should have some protection like a voltage regulator, mosfet, optoisolator, etc., on there.
Re: Best Capacitive Proximity Sensor for Glass Sheet on PCB Heater? October 04, 2015 09:50AM |
Registered: 10 years ago Posts: 814 |