Page 330 - Making things move_ DIY mechanisms for inventors, hobbyists, and artists

Chapter 10 Projects 307

• Hardware

• Large plywood or other wooden board to use for canvas (around 3 ft × 2 ft
will work well)
• Eight M3 screws, 20mm length (McMaster 92095A185)
• Eight M3 lock washers (McMaster 92148A150)
• One pack M3 washers (McMaster 91116A120)

• Drill (either portable or drill press) and drill bits: 3/8 in, 1/8 in
• Diagonal cutters (like SparkFun TOL-08794)
• Two 3D printed pulleys

NOTE See the resources section on www.makingthingsmove.com for a
link to a file you can download, as well as a link to where you can buy the
pulleys.

• Spring clamp (like McMaster 5107A1) that will hold the marker
• Black marker
• Monofilament fishing line

• Large white paper
Recipe:

1. Prepare two stepper motor/EasyDriver/breadboard assemblies as you did in
Project 6-9. Use a benchtop power supply to get 12V power and ground to
the GND and M+ pins on each of the EasyDrivers. Set them up to interface
with the Arduino as shown in Figure 10-21.

2. For the left motor:

• Arduino GND to GND on left EasyDriver
• Arduino pin 11 goes to DIR
• Arduino pin 12 goes to STEP