Commodore Plus/4 signals morse code to LEGO plotter
The BASIC program to control the plotter
Entering a word to be plotted in morse code
Photo resistors receive information from black or white areas on the screen
The LEGO morse code plotter.
The engines are powered through relays controlled by the photo resistors.
LDR and relay schematics (click to enlarge)
The engine that does the paper feeding
The pencil lifted and lowered by another engine
The resulting morse code