{"id":475,"date":"2013-11-16T00:57:30","date_gmt":"2013-11-16T00:57:30","guid":{"rendered":"http:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/?p=475"},"modified":"2013-11-16T00:57:31","modified_gmt":"2013-11-16T00:57:31","slug":"moneo-day-17","status":"publish","type":"post","link":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/2013\/11\/16\/moneo-day-17\/","title":{"rendered":"Moneo: Day 17"},"content":{"rendered":"

Week’s Accomplishments:<\/p>\n

\"\"<\/a><\/p>\n

\"\"<\/a>\"\"<\/a>\"\"<\/a>\"\"<\/a>\"\"<\/a> Tested soldering the copper wire thread to components. Seemed to work really well. Didn’t even burn the fabric too much!<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Here is a close up of the wiring and solder connections. The wires are really small!<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Copper taffeta from LessEMF. Nice stuff and the shipping was faster than I expected.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Close up of the taffeta. The conductivity is good across the surface, so hopefully this will be useful for a variety of tasks.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Both Teensys are plugged into the breadboard with SD-card slots. All we need now is the transmitters and we can get some communication happening.<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

Screenshot of the VCard loading from SD chip and then the SipHash running on it to generate a 64-bit hash code. Should be strong enough to avoid collision, while being short enough to transmit really fast for identification.<\/p>\n

Problems:<\/h1>\n

No serious problems apart from waiting for parts.<\/p>\n

Successes:<\/h1>\n

Hash code went smoother than expected. Discovered SipHash, a fast hash developed to resist collision attacks on hash tables. Not as safe as something like SHA1, but really fast for a micro-controller to perform (350 us!) and certainly suitable for a small scale prototype. Overall I’m quite pleased with it.<\/p>\n

Schedule:<\/h1>\n

Starting to run behind I think, due to the delay on the RF transmitters. But the shielding fabric is in, so when I get them, I can start testing with that immediately.<\/p>\n

Next week:<\/h1>\n

Hope and pray the transmitters arrive early, so I can figure them out by end of the week. There is a shipping notice, so here’s me hoping.<\/p>\n","protected":false},"excerpt":{"rendered":"

Week’s Accomplishments: Tested soldering the copper wire thread to components. Seemed to work really well. Didn’t even burn the fabric too much!       Here is a close up of the wiring and solder connections. The wires are really … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":57,"featured_media":477,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[13,1],"tags":[],"_links":{"self":[{"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/posts\/475"}],"collection":[{"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/users\/57"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/comments?post=475"}],"version-history":[{"count":5,"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/posts\/475\/revisions"}],"predecessor-version":[{"id":486,"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/posts\/475\/revisions\/486"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/media\/477"}],"wp:attachment":[{"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/media?parent=475"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/categories?post=475"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.discovery.wisc.edu\/wearablecomputing-13\/wp-json\/wp\/v2\/tags?post=475"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}