Card Reader
The card reader is designed to let the microcontroller know when the correct access card is inserted fully into the machine. The card reader has two tape sensors - one located at the far back of the slot and the other in the middle. When the card is fully inserted, the back sensor should see a white background (different from the dark Duron it sees when nothing is inserted) and the front sensor should also see a dark background. This card reader is actually designed to read the card from both orientations, regardless of which way the card is inserted (so long as the text is facing up).
The card reader is made of Duron, and held together with wood glue. The assembly is embedded into the main frame using another mounting bracket, which screws into the frame. The tape sensors attach to the card reader by press fitting into the slots, allowing just enough distance between the card and the tape sensor to provide an accurate reading.
Rough dimensions of the card reader are seen to the right, with a detailed assembly drawing below.
The card reader is made of Duron, and held together with wood glue. The assembly is embedded into the main frame using another mounting bracket, which screws into the frame. The tape sensors attach to the card reader by press fitting into the slots, allowing just enough distance between the card and the tape sensor to provide an accurate reading.
Rough dimensions of the card reader are seen to the right, with a detailed assembly drawing below.