Whether we realise it or not, the tools we use to communicate, from spoken word to email, affect the content and tone of what we say, as well as the context of how our messages are received. It's as if the devices add their own personalities to our messages as we communicate through them.
The brain of the typewriter is an Arduino, it outputs the key triggers to a series of shift registers that then control solenoids using logic level MOSFETs. The carriage return is controlled using a motor that is engaged using another solenoid. The line feed is also controlled by a solenoid. There are three reed switches. Two to detect the start and end of the carriage return and one to detect the amount of ribbon remaining and swap the direction of the ribbon when necessary.
Thanks to Chris Cairns for the video.
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