- Inspired of the orignal egg-bot I designed a interactive variant for egg-decoration.
- Designed to be easily assembled and printed (no support required if oriented properly while printing)
- Controlled via serial interface (i use putty to connect, any terminal will do)
- Video: https://www.youtube.com/watch?v=KuiRFXf5oMg
Modes of operation
- Direct control (move left/right, rotation forward/reverse) and pen up/down keys like an etch-and-sketch
- 360 degrees patterns via simple numerical commands. ("Pattern button" followed by one to three digits do select pattern, frequency and width)
Pen mount (alternatives)
Bill of material
- 3d printed parts (PLA)
- 1 arduino (or standalone atmega328p) with serial connection to host computer
- 2 driver boards (ULN2003 based)
- 2 stepper motors (28BYJ48 DC 5V) (~3$ each from China incl. driver board)
- 1 servo (mini 9g ~3$)
- a few M4 and M5 screws, washers and nuts
- a couple of screws to mount the pieces to the base plate
- 1 spring
- 1 rubberband
- "Oogoo" (silicon and corn starch) to the paddings
- baseplate in any scrap wood material (my was laminated)
- pencils
- (optional USB keyboard with stickers)
- style cheat sheet
Challanges
- Backlash in the geared steppers was mitigated with software backlash compensation for the rotating axis and with a rubberband for the moving arm. [resolved]
- Finding the perfect tention so that the egg doesn't slip (making it moving less than expected 360 degrees) [still experimenting]
Firmware
https://github.com/ahd71/incedm
