====== Description ======
A cybernetic-augment. \\
An armband with sixteen vibration motors. Inspired by the northsense and the southpaw, but a less invasive device. 
Based on the research I've done on people's experiences with similar devices, after enough use it will increase the user's sense of the cardinal directions. My brain will learn to take in the sensory data as an extra sense.

BUDGET: $30

====== Components ======
{{tablelayout?rowsHeaderSource=Auto&colwidth=""}}
^ Components               ^ Name                               ^ Price                                                         ^
| LSM303                   | Digital Compass                    | [[https://www.aliexpress.com/item/32952234398.html|$2.93]]    |
| 18650 holder             | Duel Battery Holder                | [[https://www.aliexpress.com/item/32823843782.html|$1.21]]    |
| PCA9685                  | 16-channel PWM Controller          | [[https://www.aliexpress.com/item/4000468996665.html|$3.36]]  |
| ULN2803                  | (2) Transistor Array               | [[https://www.aliexpress.com/item/32768786362.html|$1.42]]    |
| DIP18 Socket             | (1) IC Socket                      | [[https://www.aliexpress.com/item/1000001440248.html|$1.63]]  |
| Coin Vibrator            | (16) 3V Coin Vibration Motor       | [[https://www.aliexpress.com/item/32774852009.html|$14.52]]   |
^ Already Have Down below  |                                    |                                                               |
| 10uF Ceramic Cap         | 10uF Ceramic Cap                   | [[https://www.aliexpress.com/item/32863633506.html|$1.77]]    |
| HT7833                   | 3.3V LDO                           | [[https://www.aliexpress.com/item/32823499991.html|$1.38]]    |
| ESP32                    | Microcontroller                    | [[https://www.aliexpress.com/item/32933002394.html|$4.94]]    |
| 1000uF Cap               | 10V 1000uF electrolytic capacitor  | [[https://www.aliexpress.com/item/32814611460.html|$2.24]]    |

====== Notes ======

I could use the iphone 7 taptic engine as the vibrator actually? Would be good source of cheap LRM? Available for about $3 per motor
https://www.reddit.com/r/AskElectronics/comments/8umvp6/what_voltage_should_i_put_across_apples_taptic/
About 4V?

    * https://learn.adafruit.com/lsm303-accelerometer-slash-compass-breakout/coding
    * LSM9DS1?
    * https://cdn-shop.adafruit.com/datasheets/PCA9685.pdf
    * https://www.tindie.com/products/Fyberlabs/uln2803a-darlington-array/
    * https://www.tindie.com/products/Fyberlabs/16ch-erm-haptic-flex-module/
    * http://www.ti.com/lit/ds/symlink/uln2803a.pdf
    * https://cdn-shop.adafruit.com/datasheets/LSM303DLHC.PDF
    * https://www.pololu.com/file/0J434/LSM303DLH-compass-app-note.pdf
    * https://github.com/pololu/lsm303-arduino/blob/master/README.md

===== I2C =====
  * GPIO 21 (SDA)
  * GPIO 22 (SCL)

{{ :project:hci:haptic-compass.png?700 |}}

====== References ======
https://www.wired.com/2007/04/esp/ \\
http://download.icxbk.com/201709/ea4a1abb94615354ef4188b682bbbc88.pdf \\
https://en.wikipedia.org/wiki/Somatosensory_system \\
https://learn.adafruit.com/adafruit-drv2605-haptic-controller-breakout/overview \\
https://i2.wp.com/randomnerdtutorials.com/wp-content/uploads/2018/08/esp32-pinout-chip-ESP-WROOM-32.png?ssl=1 \\
https://medium.com/@SomaticLabs \\
https://en.wikipedia.org/wiki/Haptic_technology#Vibration \\
https://www.learning-mind.com/extra-human-senses/ \\
https://www.precisionmicrodrives.com/vibration-motors/eccentric-rotating-mass-vibration-motors-erms \\