A talented Maker by the name of “Marcel” recently devised a slick Arduino-based LEGO drawing machine.
As HackADay‘s Rich Bremer reports, RC Car Servos are used to drive the pen in the X and Y directions.
“These servos only have a 180 degree range of motion which is not enough to move the pen very far. To increase the pen’s travel distance, [Marcel] attached a large gear to the servo which rotates a much smaller gear that rides on a rack gear attached to the bed. A Lego hinge takes the place of a Z axis and is used to set the height of the pen that is strapped to the machine via rubber band.”
In order to make the machine draw, the user moves an analog joystick. The changing resistance values of the joystick’s potentiometers are measured by an Arduino, which then moves each servo to the appropriate position using PWM.
Interested in learning more? You can check out the project’s official HackADay page here.