Wrangling Resistors: Creating a Calibrated LED Light for Photoresistor Testing

Wherein we discuss making a calibrated LED light pen that can be used to figure out what bias resistors to use for each sensor of the EUP5108 Punch Card Reader.

Breadboard battery box: https://www.thingiverse.com/thing:3855654
Cold solder breadboard: https://www.thingiverse.com/thing:3834264

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 (thought we) learned last time that the light sensors (photo resistors) would best be read using the Analog inputs - in practice we just dropped the LEDs for each bit and used the digital inputs as originally planned - but some sensors were way more sensitive than others so reading the card data was unreliable.

Still to do: Showing how I connected the sensor bar to an Arduino nano microcontroller along with the code used to read the punch card data into the computer.

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