Step 1: Introduction/Inspirations
Links to this project's inspiration:
digg me tshirt ( digg comments)
digg button kit ( digg comments)
It was noted that while writing this instructable digg user SnOwie mentioned he was working working on a shirt like this in the comments. This was purely coincidental; I would love to know how his is going.
I ordered the digg button kit from adafuit industries on the 30th June, so this project has taken approximately three and a half months to complete, working a few hours on the weekend.
Step 2: Research
The following is a list of resources that helped me greatly.
- Lame Lifesaver - Conductive Thread for Lame Repair
- A Wearable Display for Team Sports
- reSkin :: ANAT's wearable technology lab
- leah buechley - do it yourself - make your own wearable LED display
- GRYNX > Make your own wearable LED display
- DIGG button
0900766b80200898.pdf the Kingbright 1.5" 7-segment display
C4724JR.pdf the lighton triple digit 0.4" 7-segment display
Step 3: Materials/Equipment
- 1x large plain white Bonds tshirt, purchased from local department store $8.80
- 1x A4 sheet of iron-on transfer paper, eBay $3
- 3x 1.5" red 7-segment LED, SC15-11SRWA RSAustralia $11.40
- 1x digg button kit US$23.20
- 1x spool conductive thread CAD$23.90
- 20cm nylon netting [http://nylon netting $8/m 20cm $1.60 Spotlight] $8/m $1.60
- 100x Sterling silver crimping beads 2mm eBay US$5
- sewing machine
- iron and ironing board
- soldering iron
- wire cutters and strippers
Step 4: Prototyping
The digg button kit was assembled on a bread board with the 7-segment displays. The results are below:
Step 5: Designing the digg logo
All colours were matched precisely and the gradients were quite close. The Adobe Illustrator files can be downloaded below. Feel free to use it in any of your digg projects in the future. Note, when applying iron-on transfers, the image needs to be reflected.
Step 6: Fabric switch
I didn't have any conductive fabric, so the conductive thread was sewn to cover the fabric, two pieces of nylon netting was used to separate the fabric as this seemed to work the best.
Below is a video of the fabric switch in action:
Step 7: Sewing the electrical 'tracks'
- greatly more wearable.
- interesting experience.
- very messy: whilst I planned where each thread would go, it was impossible to make nice stiches (as seen in the below photos).
- problem of shorts due to no insulation: whenever the thread needed to overlap, a piece of fabric was required to insulate the overlapping thread.
- visible: even though white thread was used on the outside and the conductive thread on the inside the almost black colour still showed through.
Step 8: Applying the iron-on transfer
The procedure is as follows:
1. print the design on the iron-on transfer paper with an ink-jet printer, the design must be reflected
2. trim any excess paper around the edges. Intricate detail can be left.
3. iron the tshirt to remove any creases, the iron should be on the driest setting.
4. apply the iron-on transfer to the tshirt facing down.
5. with a piece of fabric over the transfer, start ironing the iron-on transfer. The iron should be on the driest and hottest setting.
6. continue for 5 minutes. Remember to concentrate on the edges.
7. check that the transfer is stuck to the tshirt, if it can be removed continue ironing.
8. remove the backing paper of the iron-on transfer.
Step 9: Wiring (or threading)
I used an idea I read on Leah Buechley's website where crimping beads were soldered to LEDs and then threaded with the conductive thread. The same principle was used here on both the 7-segment display and on the digg button PCB.
The 7-segment displays where glued together and all common anodes had soldered wires connecting them together.
It was determined that 4.0V was the optimal voltage (this was achieved by using a variable power supply and a multimeter). However, 4.0V batteries seemed to be quite a rarity. Hence, having owned a phone with a 3.7V battery, this was used instead and seamed to produce nice results. Phone batteries also have the advantage of being quite thin.
Step 10: Finishing it all up
The 7-segment displays had white faces, and ruined the yellow on the digg logo. Using a transparency and the liquid crystal display font, a logo was printed out with clear (white text) sections for the 7-segment displays.