Hi all
I just woke up from bed again with the idea to use use laser triangulation for
the distance measurement, since there's an inexpensive solution already for
Arduino:
https://rohling-de.blogspot.com/2017/04/shooting-laser-to-measure-distance.html
https://www.st.com/resource/en/datasheet/vl6180x.pdf
The internal ADC has a resolution of 16 bits, which should be sufficient to
resolve the small distance a table for a 2 inch wafer has to travel.Cheers
DavidOn Sunday, August 1, 2021 2:46:34 PM WEST David Lanzendörfer wrote:
> Howdy
> So I came across those two components which can solve our positioning
> problem with the wafer:
>
> Those LEDs produce a light within the spectrum we need in order to shine
> through silicon (1000nm ~ 1400nm):
> https://tech-led.com/en/product/ir-nir-leds/
>
> The OV5647 is sensible up to at least 1000 nm and is quite affordable:
> https://cdn.sparkfun.com/datasheets/Dev/RaspberryPi/ov5647_full.pdf
>
> There are OV5647 imaging modules available for Raspberry Pi.
> I'll try to contact Marubemi directly and ask them for a quotation on their
> NIR/IR LEDs in the wavelength range we require and while I'm on it, I'll
> also check with them for a potentially more suitable CMOS sensor, then I'll
> compare the prices.
> As I've discussed with Dilek, the goal is to produce an affordable stepper
> suitable for hobbyists and small labs with limited budget.
>
> Cheers
> David--
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