Arduino Sensor Bar!... Assemble!

Wherein I create a sensor bar to hold the light sensors for the physical version of the EUP5108 Punch Card reader.

This circuit on TinkerCad WAS the basis of the physical design but as we shall see few simulations stand up to variability of actual electronic hardware.
https://www.tinkercad.com/things/d9uO3r4u5sQ-bizpunchcardreader

We learned last time that the light sensors (photo resistors) would best be read using the Analog inputs to get light brightness values of 0..1023 rather than trying to manually match the resistance values to get a clean 0/1 reading on the digital inputs. We will still have to use one of the digital input pins for the data-ready input (bottom row of green dots on the cards).

In the end these will be connected to a Arduino nano microcontroller based embedded system to read the punch card data into the computer.

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