Easter egg painter helping hand by siddharta

Last crawled date: 3 years ago

Rotates the egg. Nothing more to it.
BOM
printed parts
M5 threaded rod and 8x M5 nuts
M3x50 bolt and 1x M3 nut for egg holder
2x M3 nut and 2x M3x5 bolt
a spring for the egg holder "idler"
28BYJ-48 stepper
Arduino
ULN2003 driver, easily found on eBay
Reused code from http://forum.arduino.cc/index.php?topic=85335.0 to drive the stepper at a constant (slow) speed. The code from the first post will work just fine, all you need to modify is the main loop().
void loop() {
   motorSpeed = 1;  // set a constant slow speed
   clockwise();          // start clockwise rotation
}
Connect the signal and power wires from the ULN2003 driver board as follows to the Arduino Uno:
IN1 to Arduino pin 8
IN2 to Arduino pin 9
IN3 to Arduino pin 10
IN4 to Arduino pin 11
5V+ to Arduino Uno 5V
5V- to Arduino Uno GND
It will work on a Micro or Nano as well, but you'll need an external 5V power supply for the stepper.
Happy painting :)