Raspberry Pi enthusiasts or electronic hobbyists looking to build an affordable pen plotter may be interested in the BrachioGraph. An easy-to-build pen-plotter, driven by a library of simple Python applications. To be able to build your pen plotter you will need :
– two sticks or pieces of stiff card
– a pencil or ballpoint pen
– a clothes-peg
– 3 servo motors
– a Raspberry Pi, to drive the servos and run the custom code
Full instructions on how to build your BrachioGraph, “the cheapest, simplest possible pen-plotter” jump over to the official website by following the link below. Website also explains the mathematics behind the pen plotter as well as providing details on alternative designs and materials that can be used to create a variety of different configurations. Software takes the form of :
– brachiograph.py to draw images using the servos
– linedraw.py to vectorise bit-map images
– turtle_draw.py to help visualise the drawing area of the plotter
– pulse_widths.ipynb, a Jupyter notebook to visualise the relationship between pulse-widths and servo angles
– pantograph.py to drive an alternative plotter design
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