Alerts in 3 colors, material missing in A (in my case A is near drills) shows red, material missing in B (in my case on the end of furnaces) shows yellow, and green sign if everything goes perfect. It has a delay of 5s to avoid flicker.
This is an example but i'm using in my game for iron and copper.
Only one color at time. Red turn off green and yellow, and yellow turns off green.
Is perfect for outpost, red for low extraction and yellow is material missing on furnaces (train stuck or low materials)
Tips to improve it? recently that I use combinators
And Blueprint
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