====== BrmPaw2 ======
{{template>:project:infobox|
name=BrmPaw2|
image=northpaw-anklet.jpg?200|
founder=[[user:Tom]]|
depends=[[user:jenda]]|
interested=[[user:sachy]]|
status=done}}

~~META:
status = in progress
&relation firstimage = :project:northpaw-anklet.jpg
~~

A clone of [[http://sensebridge.net/projects/northpaw/|North Paw]], an anklet that tells the wearer which side is north using vibrating motors, was built in 2011. Thats our v1, but we want better!

We want to modernize whole concept: 
  * replace vibrating motors in plastic tubes with [[https://www.aliexpress.com/item/10pcs-4x11mm-Extra-Micro-DC-Coreless-Motor-vibration-motor-with-cable-free-shipping/1897296445.html|for example this one]], or [[https://www.aliexpress.com/item/Wholesale-20pcs-10X2-5mm-DC-3-7V-Coin-Vibration-Motor-Micro-Motor-brushless-vibration-motor-built/32634500313.html|this one]]
  * upgrade electronics to modern one
  * upgrade fabric stripe around the ancle with adjustable size (some kind of elastic band/rubber?)
  * make better board - first one was bad, according to Jenda
  * possibly conduct experiments about orientation and passive memory of directions

List of electronic parts (TODO)
  * [[https://www.gme.cz/data/attachments/dsh.958-133.1.pdf|ATMega 168-TQFP 32]]
  * battery (something like 18650)
  * shift register
  * [[https://www.postavrobota.cz/Digitalni-kompas-HMC5883L-magnetometr-modul-3-osy-d120.htm|Digitální kompas HMC5883L magnetometr modul 3-osý]]
  * vibration motors

===== Status =====

in active progress (Tuesdays)

===== Plan =====
  * connect compass to Arduino and try it out on fine hardware
  * figure out how to connect ATmega to other components
  * scribe scheme in gschem
  * finalize board in pcb-gtk
  * bring it to lab and etch

===== References =====

  * http://sensebridge.net/projects/northpaw/
  * http://www.newscientist.com/article/mg21028185.800-haptic-soldiers-guided-by-buzzing-belt.html :)
  * http://www.wired.com/wired/archive/15.04/esp.html?pg=1&topic=esp&topic_set=
  * http://feelspace.cogsci.uni-osnabrueck.de/ - a more advanced implementation recently published
  * https://www.postavrobota.cz/Digitalni-kompas-HMC5883L-magnetometr-modul-3-osy-d120.htm