Designs and code for a very primitive rig for reading punched tape.
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boards/5mm-phototransistors
punchtape_reader
LICENSE
Readme.md
circuit.jpg
punchtape-channel.dxf
punchtape.dxf

Readme.md

Hardware

punchtape.dxf has the basic mechanical design of the read head. The head is bolted together with M3 hardware.

boards/5mm-phototransistors contains Eagle CAD files for the LED emitter and phototransistor boards.

Software

The reader is implemented as an Arduino sketch in punchtape-reader/punchtape-reader.ino. I'm using a Teensy++ 2.0 at present but it should work with any ordinary Arduino variant. You'll have to alter the pin assignments at the top of the file, though.