Day 11: (Tue Oct 3, Week 6) Common Platform Design

Notes for 2023-10-03.

Agenda

1. Review and demonstrate results for Assignment 7 Posts: Maquette.

2. Review conclusions of common platform discussion from last Thursday. Partial consensus:

   • dynamic material manipulation

   • horizontal array of similar impellers

   • plus some kind of secondary actuation (e.g. fans, mirrors)

   • controlled lighting

   • ambient audience interaction (e.g. camera system)

3. Discuss quick floor grid sketch.

4. Pragmatic considerations:

   • modular design

   • material containment

   • motor selection

   • electronics requirements

   • power requirements

   • firmware: low-level motion control

   • controller: Python scripts on Linux

   • structural requirements

   • assembly and access constraints

   • lighting and fans

   • camera options

5. Design considerations:

   • material: sand, steel, glass, ping-ping balls, balloons etc.

   • array layout: regular, irregular, square, hex, etc.

   • array size, height

   • surface contour, features, material, color

   • iconography

References

Actuation

• CNC Arduino Shield

• KL17H248-15-4A NEMA17 stepper motor (2.5A, 1.25 Ohm, ~8W, 76 oz-in)

• KL23H256-20-6A NEMA23 stepper motor (1.4A, 3.6 Ohm, ~7W, 166 oz-in)

• Turnigy TGY-5513MD Servo (12 kg-cm) (165 oz-in)

• Longruner MG996R Servo (12 kg-cm)

• High Torque RC Servo (25 kg-cm)

Materials

• bulk 1/4 inch slingshot ammo, typical (11.46 lbs @ $2.70/lb) (~2 sq ft densely packed)

• premium sand, typical (20 lbs @ $2.15 lb)(~0.2 cu ft = ~2.4 sq ft @ 1 inch)

• play sand, typical (48 lbs @ $0.11/lb) (0.5 cu ft = 6 sq ft @ 1 inch)

• ping pong balls, bulk, typical (120 @ $0.12/each, 40 mm diameter) (~2 sq ft densely packed)

Machine Vision

• Blackfly S Mono 1.6 MP GigE Vision (Sony IMX273)