Duration: 8:40

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Part four in this series of "making of" videos where I make a super-basic printer controlled by an Arduino.

There's still no pen, so I stuck an LED where the pen will go and made it turn on when the pen should be drawing, as a test. Then, I took a long-exposure photo while it "printed" with the LED, pointing the camera upwards slightly after it finished each row. What I ended up with was a photo of the image that it tried to print, with inverted colours and stretched a bit because I didn't move the camera at the right speed.

It can also now print bidirectionally, and it's much faster to receive the data for the next row of pixels, because they're no longer sent one at a time.

Illustrations are by とんぐ (Tongu) (Pixiv member ID: 258901) and CAFFEIN (blog: http://caffein89.blogspot.co.uk / Pixiv member ID: 13054).