$150 mural drawing robot kit
Primary image
What does it do?
Draws murals by following GCode instructions and/or etch-a-sketch style commands
Knowing the length of each string and the distance between the servos gives us everything we need to use trigonometry to find the XY coordinates of the pen. We can also do the reverse, which means we can find how much to change the strings to move from A to B. From there I added gcode support. Lastly I wrote some Java apps to create a nice GUI. If your arduino comes with the firmware already loaded then you don't even need to install the Arduino app. :)
Cost to build
$150,00
Finished project
Complete
Number
Time to build
1 hour