Arm that draws things

Created on 29 Oct 2018

Arm that draws things

A mechanical apparatus consisting of motors that will draw pictures. It will appear to have a mechanical hand that drops/lifts a pen, a forearm that connects the arm to the to elbow joint. The elbow joint is connected to the shoulder/base via a shaft that acts as the humerus. Will use pwm motor control, possibly opencv, and signal processing to come up with drawing algorithms. Will potentially have a web-app interface to go along with it.


Ranganath Selagamsetty


Sung Jun Hong


Sourav Panda


David Yang

Part Cost Quantity Total
Plastic Gears $5.49 4 $21.96
Plastic spur gears set to create appropriate gear ratios.
Epoxy Resin $4.67 2 $9.34
To glue together ball-bearing joints
Stepper Motor (small) $36.61 1 $36.61
For tilting the pen on and off of the paper.
Stepper motor (lg) $36.61 3 $109.83
stepper motors to control arm joints
50 Popsicle Sticks $2.99 1 $2.99
To jerry rig support structures.
Foam Blocks $11.99 1 $11.99
Foam blocks for the base to mount the motors.
Pulleys $8.98 1 $8.98
Pulleys for tendons
String $3.50 1 $3.50
Act as tendons in the arm
Wooden Dowels $1.91 1 $1.91
0.5 in wooden dowels that will act as the upper-arm and fore-arm
Ball Bearings $12.07 1 $12.07
Ball bearings for the elbow and shoulder joints.
Binder Clips $6.99 1 $6.99
Clips to help secure the paper to the clipboard when our arm draws.
Clipboard $4.95 1 $4.95
A clipboard to hold the paper that the arm draws on
Raspberry pi 3 $37.69 1 $37.69
Raspberry pi to control arm motors
Project Totals: 19 $268.81
Track 1 Base Budget: $250.00
Preferred Vendor Budget Bonus: $0.00
Remaining Budget: $-18.81