Detailed proposal for IR sensor modulation January 07, 2014 10:24AM |
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Re: Detailed proposal for IR sensor modulation January 07, 2014 11:31AM |
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Re: Detailed proposal for IR sensor modulation January 07, 2014 11:38AM |
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Re: Detailed proposal for IR sensor modulation January 08, 2014 02:29PM |
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Re: Detailed proposal for IR sensor modulation January 08, 2014 02:41PM |
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Re: Detailed proposal for IR sensor modulation January 13, 2014 10:31AM |
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Re: Detailed proposal for IR sensor modulation January 13, 2014 10:57AM |
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Re: Detailed proposal for IR sensor modulation January 14, 2014 11:47AM |
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Re: Detailed proposal for IR sensor modulation January 14, 2014 12:23PM |
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Re: Detailed proposal for IR sensor modulation January 14, 2014 01:41PM |
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Re: Detailed proposal for IR sensor modulation January 14, 2014 02:06PM |
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Re: Detailed proposal for IR sensor modulation January 14, 2014 02:14PM |
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Re: Detailed proposal for IR sensor modulation January 14, 2014 02:25PM |
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Excellent, thanks DC42, that improvement is really significant reducing it to that magnitude.Quote
dc42
....It's still a bit sensitive to ambient light, but the sensitivity has been reduced by a factor of 14.5. The practical upshot of this is that when I do a bed probe or z-axis home, the effect of having that light on is make the nozzle just over 0.1mm too high. Without modulation, having the same light on makes the nozzle 2.5mm too high.
I can see that the G31 reading is more variable with the light on than off. I think this is due to 50Hz modulation in the light. If I can find the time, I'll look at running the ADC on a timer interrupt, doing conversions for the z-probe and the thermistors in the background.
Re: Detailed proposal for IR sensor modulation January 15, 2014 02:19PM |
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Re: Detailed proposal for IR sensor modulation January 15, 2014 02:40PM |
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Re: Detailed proposal for IR sensor modulation January 17, 2014 10:35AM |
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Re: Detailed proposal for IR sensor modulation January 17, 2014 12:52PM |
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Re: Detailed proposal for IR sensor modulation January 17, 2014 01:14PM |
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Quote
TMD_RS436
@dc
Why not fit the bare minimum value in series with a pre-set resistor that way you can adjust it with the arm at its maximum height and adjust it to reduce the ambient/sun light and then do the test for the Z sensor.
And by having the bare minimum fixed resistor you will be protecting the emitter if you went to low with the pre-set.
SMD Pre-sets are rather small.
Just an idea.
Paul
Re: Detailed proposal for IR sensor modulation January 17, 2014 01:43PM |
Registered: 9 years ago Posts: 119 |
Quote
dc42
Quote
TMD_RS436
@dc
Why not fit the bare minimum value in series with a pre-set resistor that way you can adjust it with the arm at its maximum height and adjust it to reduce the ambient/sun light and then do the test for the Z sensor.
And by having the bare minimum fixed resistor you will be protecting the emitter if you went to low with the pre-set.
SMD Pre-sets are rather small.
Just an idea.
Paul
Could do, however I am now set up to add extra parallel load resistors into the circuit easily using a push-in connector and croc clip lead. What I really need is consistent sunlight. And to sort out the noise issue.
Re: Detailed proposal for IR sensor modulation January 17, 2014 02:21PM |
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Re: Detailed proposal for IR sensor modulation January 17, 2014 05:08PM |
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Re: Detailed proposal for IR sensor modulation January 17, 2014 05:55PM |
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Re: Detailed proposal for IR sensor modulation January 18, 2014 07:02AM |
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Re: Detailed proposal for IR sensor modulation January 18, 2014 10:13AM |
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Re: Detailed proposal for IR sensor modulation January 18, 2014 07:08PM |
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Re: Detailed proposal for IR sensor modulation January 19, 2014 12:37AM |
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Re: Detailed proposal for IR sensor modulation January 19, 2014 05:56AM |
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Re: Detailed proposal for IR sensor modulation January 19, 2014 06:28AM |
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Re: Detailed proposal for IR sensor modulation January 19, 2014 03:51PM |
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