Differential IR sensor preliminary results May 26, 2014 05:23PM |
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Re: Differential IR sensor preliminary results May 26, 2014 05:50PM |
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Re: Differential IR sensor preliminary results May 27, 2014 02:06AM |
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Re: Differential IR sensor preliminary results May 27, 2014 06:39AM |
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auser
I would like to pre-order one!
Re: Differential IR sensor preliminary results May 27, 2014 06:45AM |
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jstck
Seems pretty neat, looking forward to the upgrade. At roughly what height over the bed does it trigger?
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the Kapton tape (delivered with the printer) measures exactly 0.05mm
Re: Differential IR sensor preliminary results May 27, 2014 07:11AM |
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dc42
I'm wondering whether to add a red LED to indicate when the hot end heater is on (thanks Kim for the idea). Is that a feature that users would like? The LED would most likely be where the fan connector is now but on the SMD side of the board.
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dc42
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jstck
Seems pretty neat, looking forward to the upgrade. At roughly what height over the bed does it trigger?
Currently at a nozzle height of 0.85mm over glass and 0.90mm over Kapton. The board is currently off the machine, so I can't measure the height of the board edge above the nozzle at the moment.
Re: Differential IR sensor preliminary results May 27, 2014 07:54AM |
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Re: Differential IR sensor preliminary results May 27, 2014 08:18AM |
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appjaws1
..Did you give any more thought to mapping the bed at more points that just the corners?, Could this compensate for glass that is domed at the centre?..
Re: Differential IR sensor preliminary results May 27, 2014 09:39AM |
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Re: Differential IR sensor preliminary results May 27, 2014 10:56AM |
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Re: Differential IR sensor preliminary results May 27, 2014 11:50AM |
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Re: Differential IR sensor preliminary results May 27, 2014 12:47PM |
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Chaisaeng
I found this device quite promising for the same functionality you are trying to accomplish
It can be very accurate within 100mm or 10 cm with feature ambient IR light compensation.
You may look at the data-sheet here [www.es.co.th]
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Any thoughts on whether this would be affected by builds that have abandoned the aluminium under the glass so that the surface under the glass is the heater PCB?
Re: Differential IR sensor preliminary results May 27, 2014 01:11PM |
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Re: Differential IR sensor preliminary results May 27, 2014 01:18PM |
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dc42
I just made some adjustments and did some more tests. It works fine on solvent cement. I now have it giving the same trigger height (0.50mm) within 0.05mm whether the bed is plain glass, Kapton, or solvent cement. White PVC tape causes it to trigger about 0.5mm too high, and I don't know why. Perhaps there is a contribution from reflections from the aluminium under the glass or the bottom of the glass, and white PVC tape is the only surface I have tested that blocks that. The trigger height doesn't change significantly between bed temperatures of 20C and 75C. The edge of the board is 1.5mm above the nozzle, so there is 2mm between the bed and the board when it triggers.
Re: Differential IR sensor preliminary results May 28, 2014 09:56AM |
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Re: Differential IR sensor preliminary results May 28, 2014 01:41PM |
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auser
would it be possible to use the smd and modify the fan duct (or whichever part the board is mounted to) to act as a lightguide or diffusor? Sorry I'm on the run hard to check right now.
Re: Differential IR sensor preliminary results May 28, 2014 03:04PM |
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Re: Differential IR sensor preliminary results May 30, 2014 10:33AM |
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