I have started a new Projects post on my Arduino MEGA signaling project. I ended up using the Arduino FC-51 Obstacle Avoidance Modules for track obstacle detection.
I spent about six months trying to find a good looking for 3mm bicolor LEDs for my signal heads without any success. I finally found a perfect three color SMT LED, the SMLT4-RGY by Bivar.
https://drive.google.com/file/d/1I2HOwbZgvt-yxsHymj-wm7udxyi7ZzJ3/view?usp=sharing
The SMTL4 doesn't have a lens but it is very easy to make a 3mm lens, check out my in progress Project Post.
My Upgrade Signaling Project Post.
https://melvineperry.blogspot.com/p/blog-page_49.html
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