Horrible mistakes – Wrong parts order

This week I finished the board design for the muscle sensor, after trying several layouts.

( old ones )


Here’s the fake final look.

And I use OtherMill to mill the board, because the Roland can’t do the curvy routes.

And here’s the result whoo!


And then when I was happily ready to solder the parts on, I found out that what I ordered for the 150K, and 80.6K resistors were way too small!! Their type are 0402 instead of 0603! What was I thinking?! So tiny omg *_*


After being down for a while, I ordered parts from DigiKey again and refueled my life with hope.

And, I also found out that I have surface mount 1N1418 diodes when I was examining my parts ( so many mistakes ooops ), so I changed the schematics again! Replacing the through hole diodes with the surface mount ones, creating curvy dimension, and a making a hole for hanging, possibly.


MASK_04 – Duet

Fourth¬†of MASK collection¬†‚ÄstDuet


It’s a remedy mask for two people who hesitate to talk to each other. Separated from outside world with the mask, users sit with legs crossed, face to face, and communicate with each other through smiles. It’s for the eager of¬†communicating without seeing each other’s face yet¬†still feeling the intimacy. In the virtual world, users are surrounded by huge monsters, who will help the remediation process.


  • Two-people, foldable accordion origami mask
  • Portable¬†intimate space
  • Self-made surface mounted¬†circuit board as Muscle Sensor * 2
    • One for each users
    • For detecting the muscle on face. In this scenario, will be used to detect Zygomaticus major muscle, which is associated with smiling


Content Test


Fabrication Process

Small scale paper testing (Thank Origami master Uttam for the help!) 

Then use mylar sheet for the final material. Got an angel helper Gladys!

Test putting it on two people! Need to add paper in the bottom part to increase the distance between two users, allowing the space for sitting with legs crossed face to face comfortably



Hand recognition

  • FINALLY working…
  • Work good with handfist ūüôā¬†recognition, very finicky with handopen ūüôĀ¬† recognition


  • Won’t be used in my project. Just¬†procrastinated like crazy.
  • Issues to solve
    • Transform position¬†from 2d to 3d
    • Recognition stability
    • Screenshot_2015-04-13-21-42-49

Continue reading

Muscle Sensor MASK version

For my final project in Circuit Design and Prototyping, I plan to make a customized muscle sensor (EMG) for my thesis MASK, and the idea is to use the data as a measurement of mask wearer’s nervousness, and try to cope with it with MASK (virtually and hopefully also physically).



This is the¬†first attempt to breadboard the muscle sensor, based on the design of the one¬†on¬†Sparkfun and also the tutorials on instructables. Because I don’t¬†have the component, e.g. instrumentation amp, specific resistors, there are a lot of hacky moves, and I¬†need¬†sticker patch electrodes, 9v batteries*2,¬†and components to know if it’s working or not¬†:/


¬†<– originally thinking to hook up two power supplies, but because it requires one’s positive connecting to another’s negative, I think I should ask Eric first to see if it’s safe to do that instead of using two batteries


Next steps

  1. Order components (Should I order both surface mount(for final) and through hole(for testing)?)
  2. Combine and adjust SpikeShield 2-Channel SpikerBox’ schematics, so having two inputs for microcontroller (using ATTINY)
  3. Design the shape and arrangement of the circuit to fit on the mask
  4. Qs to answer
    • What’s the power supply strategy to integrate microcontroller on the same board, with 9V for sensors and 3~5V for microcontroller?


Getting excited :DDD Lots of work and to be continued!

MASK_03 – Puppet

Third of MASK collection¬†‚ÄstPuppet


It’s a puppet mask that speaks for you when you are not in the mood of socializing but still wanting to be nice. It also helps you to escape the real world, and provides temporary healthy self-pity for you to enjoy


  • Nonverbal communication
  • Tunnel¬†between real & virtual world
    • Deal with social behaviors for you
    • Take you exploring the 100% reality-unrelated world
      • Four Corners
        1. self pity zone
        2. so many escapees zone
        3. white noise zone
        4. connect to other masks

Content Test


Fabrication Process

Use upholstery foam as paper. Trace the pattern on the foam and cut it.

Glue them with hot glue! Perfect match with foam. Thanks for the tips from awesome Jingwen!

So many hot glue sticks to make a head.

Body without hands and legs yet.

Waiting for elastic band to assemble all together! (Look like a creepy baby)