Author Archive

Drip

Posted in 11. Project Final Reports on December 14, 2009 by alicecgrantham

Summary
This project was an experiment in LED art and learning how to work with an Arduino microcontroller. The idea is to blend organic with industrial by creating the water pump from wood and simulating water drops electronically.

How it works

With the use of a potentiometer (under the daisy faucet) one can cause the drops to fall more rapidly or slowly depending on which direction it is turned in. When fast enough, the LEDs should blink at a rate fast enough to appear as a steady stream. As there were many issues to resolve in designing and building this experiment, the other parts that were planned are not seen here. Future work will include optimized code, additional water drops to maximize Arduino’s capacity, refined craftsmanship, and an additional feature of a ripple effect once a drop “hits” a flat surface. The ripple effect will be created with electroluminescent wire.

Video: http://www.vimeo.com/8174540

Arduino sketch: http://code.arc.cmu.edu/~cheng/uploads/sketch_drip.pde

Final write up: https://mtifall09.files.wordpress.com/2009/12/mti-f09_drip_alicegrantham.pdf

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dr i p p l e

Posted in 9. Project Proposals, Uncategorized on November 3, 2009 by alicecgrantham

Description
This project entails creating a dripping faucet that drips into a pool that creates a ripple effect.  The amount and speed of drips can be adjusted using an analog switch with a maximum flow and minimum drip range.  The drips from the faucet will be created using LED beads and conductive thread.  The ripple effect upon landing will be created by sequencing on/off states of concentric circles of LED beads.

Sketch

IMG_0228
sensor/effectors
sensor – analog (dial switch)
effector – strings of LED beads
logic
Default state when handle is completely counterclockwise is slow drip descending
moderately slowly and creating 1 circle  upon landing. Turning the handle clockwise
will cause drips to fall more quickly, trigger more drips to fall and activate sequence of inner to outer rings to light up and respond according to position of dial/handle.  There is a minimum/maximum range of flow and ripple controlled by how far the dial can turn counterclockwise and clockwise respectively

Components required
Arduino
Analog switch
LED beads
Conductive thread
Flexible tube for faucet pipe
Balsa wood to create handle
Glue to assemble faucet
Power supply (9v battery, case and connectors)

Timeline
Week 1
acquire materials
initial draft if/then rules for LED drip & speed up sequence
Week 2
start assembling faucet, drip stream and ripple pool
assemble test string of LED beads
continue programming for LED drip vs stream
start programming LED ripple effect with string of LED
Week 3
continue writing/refining code for working prototype
arrange lights for final model (drip stream and pool)
Week 4
continue refining code for more realistic effects

5. Treasure Hunt

Posted in 5. Treasure Hunt on October 1, 2009 by alicecgrantham

1. Bend / flex sensor
Out of Spec Bi-directional Flexible Bend Sensors™………………………………………..…….………$4.00
http://www.imagesco.com/sensors/flex-sensor.html

2. Fabric/stretch sensor
Images Scientific 2″ Flexible Stretch Sensor………………………………………………..…………..……$8.95
http://www.robotshop.us/images-scientific-2inch-stretch-sensor-1.html

3. Electroluminescent “wire” (EL-wire)
Raw EL wire by the foot 2.2mm………………………………………………………….……………………$0.98/ft
http://www.elwirepros.com/el-wire-by-the-foot-22.html

4. Alcohol sensor
Alcohol Gas Sensor MQ3………………………………………….……………………………………………..…$4.50
http://www.cutedigi.com/product_info.php?products_id=4225

5. Solenoid
24 VDC PULL-TYPE SOLENOID………………………………………………………………………………..$1.50
http://www.allelectronics.com/make-a-store/item/SOL-58/24-VDC-PULL-TYPE-SOLENOID/-/1.html

6. Linear actuator
HURST LB Synchronous Linear Actuator 115V 60HZ 10W 3603……………………………..……$4.99
http://cgi.ebay.com/HURST-LB-Synchronous-Linear-Actuator-115V-60HZ-10W-3603_W0QQitemZ110403487460QQcmdZViewItem

7. Fiber optic cable
Molex 10M (32.8FT) Fiber Optic Cable SC/LC 9/125 Singlemode Simplex – 11078……..….$7.99
http://www.buy.com/retail/product.asp?sku=208940072&listingid=28534504

8. Tiny potentiometer
Trim Potentiometer 1/2w Vertical 100 OHM…………………………………………………………..…..$0.37
http://www.mcmelectronics.com/product/DISTRIBUTED-BY-MCM-28-420-/28-420

9. Conductive fabric
EX-STATIC Fabric (Cat. #A1209) ………………………………………………………………… $4.95 per lin ft http://www.lessemf.com/fabric.html

10. Thermochromic paint/dye
Blue Thermochromic Temperature Color changing paint……………………………………..……..$22.99
http://cgi.ebay.com/ebaymotors/Blue-Thermochromic-Temperature-Color-changing-paint–_W0QQitemZ270445279099QQcmdZViewItem

11. Nitinol / shape memory alloy wire
Nitinol Wire – 0.011″ OD SuperElastic Nitinol………………….………………………………………$1.22/36”
http://www.smallparts.com/Nitinol-Wire-SuperElastic-Nickel-Titanium/dp/B001DEGVAU?ie=UTF8&qid=1254364169&pf_rd_r=1H164F1HYPBGPS4AXWQB&pf_rd_p=467590031&pf_rd_i=0&sr=1-1&pf_rd_s=center-3&pf_rd_m=AIUBT5HP6PMAF&pf_rd_t=301

12. Conductive paint
Conductive Paint………………………………………………………………..………………………..…..…………$7.50
http://www.trainaidsa.com/shop-conductives.shtml

13. Neodymium magnets
Master Magnetics 7046 6PK .47″x.11″ Neo Magnet.………………………………$2.28/6 pack => $0.38
http://www.ronshomeandhardware.com/ProductDetails.asp?ProductCode=587764&Click=1014

14. Copper tape / copper foil
Great American Copper Foil 5/32″……………………………………………………….…………………$2.11/roll
http://www.mcgillswarehouse.com/ItemsList.aspx?ProductID=107110007

15. Tilt sensor
GRI 4561 Colors B, Mercury Tilt Sensor/10 Degree Maximum Differential Angle – 4561……$5.59
http://www.securitystoreusa.com/GRI-Colors-B-Mercury-Tilt-Sensor-p/gri%204561.htm

16. Peltier Junction
1-3/16“ – Peltier Junction……………………………………………………………………………..………………$9.95
http://www.alltronics.com/cgi-bin/item/98U001/40/1%2D3%2D16%93%2DPeltier%2DJunction

buttonless clock

Posted in 2. Buttonless Clock on September 8, 2009 by alicecgrantham

joy of constant change

This buttonless clock uses a joystick to change from “display” to “set” state by pulling upward. Moving the joystick right or left will advance or rewind minutes respectively; moving the joystick forward or backward will decrease or increase the hours respectively.  Pushing the joystick down will toggle between AM and PM.  The  joystick can be pulled up gently into its default position to resume “display” state.

what if you could LOL between computers?

Posted in 1. Vision Videos on September 3, 2009 by alicecgrantham