Joaquín de prada in Opensx70 5 minutes

Rework & sensor follow-up

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So I have been building these reworked pcbs to test the light sensors and (finally!) do a working auto setting for the openSX70 cameras. I have to admit that this is not the kind of work that I like to do or that I am good for that matter.

I have to build the boards from scratch, soldering all those smd components. And half way there I have to “improvise” so to speak, to accommodate for the new parts. So first on soldering, the trick is using flux AMTECH NC-559-ASM-TF, no really, makes all much easier and the final product much much nicer, of course you have to clean after all the residue. I use a rather large tip, even for the Atmega328p, and it ends up not only being nicer, but also it is faster than soldering every single pin separately.

For rework I use fiberglass eraser when I need to remove the soldermask to connect to a track and a X-acto knife to cut the tracks.

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So here’s my “cheatsheet” to install the TSL235.

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Now I want to try different sensors like the TSL237,which is 2x more sensitive, different form factor chips, and even the TCS3200D, which is also a light to frequency device, but that has a small array of photodiodes and can be sensible to RGB.

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Here’s the TSL235 in its DIL form factor, it has a small lens. I wonder how the 2x factor on frequency and the lack of the lens and smaller size affects the magic number. We will see.

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The TSL237T instead is much smaller and lacks the lens.

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Finally a picture of the bigger TCS3200D.

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