Looking for a holiday DIY project? Build your own pen-plotter, for under $15
, to write:"arm-writer." Instead of an X-Y mechanism, the brachiograph has a shoulder motor, an elbow motor, and a rudimentary wrist, for lifting the pen off the paper.a straight line with your arm than to walk one."library. The result is limited: it can only draw over a fairly small, curved area of a piece of card or paper, and its lines are wobbly. Each of the three servomotors has a limited range of movement of about 120°.
He recommends the basic $2 servos: apparently, more expensive ones actually deliver worse results. A big problem is that the devices have a non-linear response, and he's had to allow for that in his Python code. You can calibrate your particular setup by drawing some pre-programmed lines, measure the results with a ruler, and enter the resulting values into the code, which will improve the output.
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