That completes the hardware set-up for the dual sensor test. Now onto the software test phase.
(Psst — the circuit has one glaring flaw, which I have since corrected. Can you spot it in the photos?)
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Meta
Engineer Zero 
Minus side of indicator LED not hooked up yet?
Oh, I guess it’s the plus side but still…
Very good! The plus side of the LED indicator has to go to pin 12, which is turned on and off to make the LED indicate. Sorry no prizes, but you may bask in the glory of knowing that your keen intellect and sharp perception will someday be acknowledged by all!