Re: Detailed proposal for IR sensor modulation January 20, 2014 02:53AM |
Registered: 10 years ago Posts: 314 |
Re: Detailed proposal for IR sensor modulation January 20, 2014 04:14AM |
Registered: 10 years ago Posts: 14,672 |
Re: Detailed proposal for IR sensor modulation January 20, 2014 04:29AM |
Registered: 10 years ago Posts: 256 |
Re: Detailed proposal for IR sensor modulation January 20, 2014 05:01AM |
Registered: 10 years ago Posts: 14,672 |
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kwikius
Great work! Sounds like a vast improvement. What version of the firmware do I need to try it? (I'm still using the original one)
regards
Andy
Re: Detailed proposal for IR sensor modulation January 24, 2014 04:11PM |
Registered: 13 years ago Posts: 119 |
Re: Detailed proposal for IR sensor modulation January 24, 2014 04:35PM |
Registered: 10 years ago Posts: 14,672 |
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jmgiacalone
I have also stumbled upon something whilst trying to improve the hot end thermistor readings at room temperature. The arduino libraries set the default ADC resolution to 10 bits, but using analogReadResolution(), we can set this to 12 bits. This gives a resolution of less than one micron with the sensor a couple of mm from the target surface.
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jmgiacalone
I need to put another prototype together with a 3k3 resistor, as I still have a 4k3 fitted and direct sunlight does saturate the sensor. I will try and fit the extra 10u capacitor and 1k resistor across the transistor as you (dc42) suggested earlier in this thread.
Re: Detailed proposal for IR sensor modulation January 24, 2014 04:37PM |
Registered: 10 years ago Posts: 2,472 |
Re: Detailed proposal for IR sensor modulation January 24, 2014 04:41PM |
Registered: 10 years ago Posts: 14,672 |
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dmould
One thing to consider: When you take a reference measurement, you are measuring the distance of the nozzle from the bed, not the IR sensor. You may think that the difference in height between the two is a fixed value so doesn't matter, but its value changes if the slope of the glass changes between prints (because the bed has moved). So the reference height really needs to be adjusted by computing how much the bed angle (as obtained from the bed setting parameters) had added or subtracted from the nozzle/IR height difference.
Dave
(#106)
Re: Detailed proposal for IR sensor modulation January 24, 2014 06:02PM |
Registered: 10 years ago Posts: 578 |