Cash machinepres woodbury

Machine Project Cash Machine @
The New Children’s Museum, San Diego
Tod E. Kurt and Carlyn Maw
teampneumo.com
October 24th, 2011
Woodbury University
Monday, October 24, 2011
Hello!

The Cash Machine
An interactive fundraising installation
piece now in the lobby of a children’s
art museum in San Diego

The Cash Machine
An interactive fundraising installation
piece now in the lobby of a children’s
art museum in San Diego
Quick movie of it in action

Machine Project
Provides resources to, and collaborates with
artists working with technology; promotes
interaction between artists, scientists, poets,
technicians and performers.
What is Machine Project

Machine Project
The Original Cash Machine

Machine Project Original Cash Machine Movie
Movie of it in action.
This is what it looks like / How it works
-- He had an idea that it could be pitched to this museum
-- Wasn’t sure about the engineering for additional features
-- Called us to ﬁgure it out

Carlyn
-- Founder of CRASH space LA hackerspace
-- Author of many original Arduino.cc tutorials
-- Instructor at ITP, Machine Project
-- Special Effects / Pyrotechnics work for ﬁlm
website: carlynorama.com
twitter: @carlynorama
Tod
-- Creator of BlinkM Smart LED
-- Designer of Wiichuck adapter & WingShield
-- Contributor to MAKE magazine
-- Author of “Hacking Roomba”
website: todbot.com
twitter: @todbot

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Initial Ideas & Proposal
Our design brief was brief:
- Detect bills
- Make noises, ﬂash lights, make motion
- Use 3 HP Dust Collector (Harbor Freight, Red) if possible
Stuff Hanging Off
Bigger Dust Detector
Literal “bells & whistles”
First Idea adjustment (inlet pipe organ/reed instrument vetoed)

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Initial Ideas & Proposal
Use 3 HP Dust Collector if possible (Harbor Freight, Red)
Stuff Hanging Off
Bigger Dust Detector
Literal “bells & whistles”
First Idea adjustment (inlet pipe organ/reed instrument vetoed)

Anatomy of the new system
• Pneumatics
• Bill Detection
• Sound & Light
• Movement
Can the original be made prettier?
Pneumatics - Includes the tubing, the cyclone and the impeller
Bill Detection - Sensor for the bills and a special mounting harness for them
Sound & Light - Wanted real world behaviors so we had to ﬁgure out the best way to
approach that.
Movement - And there needed to be movement on the wall that had to be very large.

Pneumatics
Impeller & Impeller Trigger, Cyclone, 200 ft. of Tube.

Recon & Initial PlanPneumatics
Animation movie of how it might look in the space.
The pneumatics again, is the tubing, the impeller and the cyclone that all need to ﬁnd a home
in a pretty stunning space.
The space is very vertical: our main elements would start at the 15 feet and go up to 35 feet.
This was a good experiment on how to convert architectural diagrams into a 3D model for
visualization.

Pneumatics / Where to place the cyclone and the impeller?
The chosen impeller to hopefully work with so much tubeis 3 horse power and 99dB, so it’s
not quiet. It also takes 220V. We had some suggestion of different places to go, but in the
end they came and got it to do sound checks. Smart move. The put it in the closet. It meant
drilling hole for the tube and adding 220V for them.
But once we ﬁgured out where they were going we still had two major questions to answer:
- Will it pull the bills through 150+ feet of tube
- How will we trigger it from across the giant lobby?

Pneumatics / Will is suck?

Pneumatics / Will is suck?
Bendiness and Length
Sharp bends create vortices that reduce suction, but we want a space-ﬁlling design
Test - Problem: Horizontal
The real space is vertical; will our horizontal tests be valid, does gravity play a big role?

Pneumatics / How to trigger 220V from a distance?
Possible trigger solutions:
- Run wire (Would be ugly, issues with wire length: it’s 80ft along wall, 40ft line-of-sight)
- Considered doing a custom radio solution, but that didn’t solve having a UL rated 220V
switching solution.
- Ended up ﬁnding wireless remote designed for dust collectors
Thank you Amazon (Amazon as research tool)

Pneumatics / Hack an existing product.
1 of 2 from Hack 220 V
Using a “Long Ranger III” wireless remote for 220V woodworking equipment.
Remote taken apart and circuit made to push buttons on remote with relays.
Circuit soldered down on a SparkFun ProtoShield

Pneumatics / Hack an existing product.
2 of 2 from Hack 220 V
First version of circuit had some intermittent behavior.
Second version had some improvements
- 9V regulator to emulate 9V battery
- added antenna wire to existing antenna to extend range
- ﬂying leads replaced with plug-n-socket connection

Pneumatics / Submitting the Layout
They needed to know ahead of time for mounting hardware ordering
We needed to know to design the spinners, supplies ordering
(With and without dots)
---
Notes about the Cyclone probably not for this talk.
-- Cyclone bottom with Lock
-- basket ball hoop with red tape & foam for mount
-- ﬁnding 6 inch to 4 inch adapter for side and 4 inch to 8 inch adapter for top.

Show the Arduino the Money.
Bill Detection

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Bill Detection / The Starting Point
Render from proposal. A kind of “clamp” that surrounds the tube and has embedded sensors,
holding a box of electronics.
Challenges we had to ﬁgure out:
- Can we really detect bills?
- Will this mounting solution work?
- How to actually build the mounts?
Let’s assume IR Beam-Break
– Would the tube refract the light?
- Speed of detections, are the sensors fast enough
- Tolerance of Ambient Light
How to mount the sensors?
- Use existing tube mounting hardware?
- Design our own laser cut mounting rings?
- Or design our own 3D printed clamps?

Bill Detection / IR Beam Break
So what are those components... (pictures of ‘lil ring boards)
Standard IR LED and standard TV IR remote control detector
That proved useful in testing later on installed tubes (use TV remote to trigger)
IR detectors need modulated IR light,
Helps ﬁlter out ambient light changes
To modulate light, need Arduino hardware timers, can’t “delay()” this

Bill Detection / Lots of tweaking for sensor ring itself
Many design iterations of the sensor rings and the electronics box
Had around 40 versions, about 10 fabbed.
Will it hold? Will it align the sensors correctly?

Bill Detection / Lots of tweaking for sensor ring itself

Bill Detection / Custom Shield
Picture of Bill Detector Arduino Shield
So much in a little space so best course of action was to make custom shield
Breadboard version proved out the idea, but can’t use in production.

Bill Detection / Custom Shield
Picture of production shields

Bill Detection / Test
First prototype PCB (fabbed 3 versions total)
3D printed rings act as both clamps around the pipe and as mounts for sensor boards

Bill Detection / All together
Final production version of sensor rings.
3D printed rings act as both clamps around the pipe and as mounts for sensor boards

Noise & Light
Bells, Servo Motors & MaxMs

Noise & Light / Bells, Bells, Bells
Tried different bell types (Amazon & Guitar Center as research tool)
- Desk bells
- Jingle bells
- Cow bells
- Shaker Sticks
- Drums & Cymbals
Needed something that cuts through the noise but isn’t annoying.
Children’s handbells seemed to best solution.

Noise & Light / Solenoids Vs. Servo Motors
Actuation methods – servo motors
Bell striking typically done with solenoids b/c they have speed
But servos have SWIIING, works in multiple orientations, don’t use as much power

Noise & Light / The right striker
Picture of servo mounted strikers
Servos can’t move fast enough.
So we stole springiness from the strikers, they make the up the needed speed
And the strikers needed to be hard & dense to get the right tone.

Noise & Light / An extra signal
Picture of MaxM
Super bright, will allow an update of color pattern (light engine) in the future if desired and /
or upgrade to strip lights.

Noise & Light / The Build Out
Production bell box.
Laser-cut wood form the box,
3d printed sensor rings
Everything painted Machine Project Red
And the arrangement of bells produce a custom melody

Spinny Bits
Styrofoam Fantasy

Spinny Bits / Baffling Red Whoosie Whatzits
This was not really part of the original project plan, and mentally had started out as little flags
and pinwheels.
But realized that we would need some fairly large objects to fill the volume of the space.
Servo drivable / combination of full rotation and regular for different behaviors. Some
motion all the time and some just a trigger reward.
LIGHT
Texture

Spinny Bits / Material & Process Research
Styrofoam, what to cover the styrofoam with, what could expedite the process

Spinny Bits / Design Research
Initial designs
Spikey
Flat
More 3 Dimensional / More Visual Volume / Less Fragile / More Asymmetric
Needed to change mounting style (there is a hole down the middle)

Spinny Bits / The drawing board
Me looking tired
Designing the “feel” of the entire piece, and the behaviors of each spinny bit.

Spinny Bits / Swappable mounting hardware
Many iterations of the mechanical linkage to transmit power from servo to spinnybit.
Also many iterations of the box itself to hold the servo motor.

Spinny Bits / Swappable mounting hardware
Close up views of the servo linkage and the spinnybit mounting plate, both 3d printed

Spinny Bits / The drawings
What kind of motor are they attached to, size factor, what order, how much Styrofoam of
what sizes, how much balsa wood of each size? Nice to have a sketch book, but also need a
spreadsheet.

Spinny Bits / Manufacturing Process
Manufacturing Process
Lots of tests with different tools
Picture of Me
White Assembled On the Grass
Painted Red
Primed?

4 Days, 5 People
The Install
Mount Impeller (hole in wall)
Mount Cyclone (Attach to rest, add end cap)
Bell Boxes
Splice Power in from 3 places, wire it to all the boxes
Spinny Bit Boxes
The Intake Had to Be mounted, lit, child proofed a little.

Install / Mounting the tubes
Trouble with angles...
Mount Pipe
Flexible Hose as Gasket
There was an app for that. (Clinometer iPhone app helped get the 45 degree angles)

Flexible Hose as Gasket
Cut small lengths of the hose to cushion delicate acrylic tube in metal bracket.

Tubes installed, now time for bell boxes

Install / Mounting bell boxes
Giving the bell boxes their approx. location so we could test them.

Install / Mounting spinny bits
Key holes were drilled into back of motor boxes for mounting

Install / Scissor Lift Joy.
Being 3 stories up in a scissor lift is fun, but tiring.

Install / Occupy San Diego
Going on at the same time as our install.

October 15th OpeningThe Pay Off

The Pay Off / Mo’ Money

The Pay Off / People Playing
Movie of it in use

But more to go...
What we learned from children watching it...
Fixing the ﬂash problem...
Good for us that it is a children’s museum
More challenging because has to be more “hardened”
Excellent because the HAVE a maintenance staff with skills.
The circuit we showed is actually going in on Wednesday b/c of loose connection
Reﬁne the behaviors of the spinners
Replaced on of the spinners where the arm didn’t survive (the glue didn’t take)

More To Go / Flash Dance
Camera ﬂashes trigger all bell boxes

Questions?

Thank You

Cash machinepres woodbury

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