The Punch Cards Are In!

The punch cards are back from the business card printer and they are beautifully colorful. However, it all has a purpose - the color coding of the dots allows me to see both where I need to punch the hole as well as what value that bit has.

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.

In the long form video I'll show 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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