====== Toward a DIY smartwatch ======

The original inspiration for this is [[https://youtu.be/LfmwhabTVB4?list=PLlg8lN4r9qWg3sE6MyL5WFhziQyT_k0DU|Tinkernut's project]]. ([[https://www.youtube.com/watch?v=3ogulEcB_Ks|Gerd Lobmeyer]], [[https://www.youtube.com/watch?v=01Ld2wzYHKo|Open Green Energy]] and others have done similar projects.)

===== Considerations =====
  * Power
  * Size

===== Components =====

==== Display ====
=== Old school LCD ===
I'm thinking of pulls from old mobile phones, esp. Nokia. Power use should be minimal. Availability (used) should be good.
  * [[https://www.sparkfun.com/products/10168|Nokia 5110]] at SparkFun, 84x48, $10
  * [[https://www.adafruit.com/product/338|Nokia 5110]] at Adafruit, 84x48, $10

=== New school LCD ===
What's available? Again power consumption should be small when backlight isn't used. Looks like finding something suitably sized with workable I/O connections is going to be difficult.
  * [[http://www.buydisplay.com/default/graphic-display/128x64-dots|128x64 graphic]]
  * [[http://www.buydisplay.com/default/character-display/8x2-character|8x2 character]]
  * [[http://www.ebay.com/itm/1-44-Red-Serial-128X128-SPI-Color-TFT-LCD-Module-Display-Replace-Nokia-5110-LCD-/262136737086?hash=item3d08912d3e:g:wyQAAOSwoydWoYhX| eBay possibility]]
  * [[http://www.ebay.com/itm/1-44-Red-Serial-128X128-SPI-Color-TFT-LCD-Module-Display-Replace-Nokia-5110-LCD-/310876068105?hash=item4861a85909:g:9LoAAOSwpzdWqdY~|ditto]]

=== OLED ===
What's the power consumption?
  * [[http://www.buydisplay.com/default/white-spi-i2c-0-96-inch-oled-display-module-breakout-board-for-arduino|White SPI I2C 0.96" w/breakout]]

==== Controller ====
=== w/ integrated BLE ===
  * Adafruit [[https://www.adafruit.com/products/2829|Feather 32u4 Bluefruit LE]], 2.0" x 0.9" x 0.28", 5.7 grams, battery charger, $30. Possibly all FOSS. :!:
  * Adafruit [[https://www.adafruit.com/products/2995|Feather M0 Bluefruit LE]], 2.0" x 0.9" x 0.28", 5.7 grams, battery charger, $30. Possibly all FOSS.
  * [[http://bleduino.cc/|Bledino]], 1.7" x 0.8"
  * [[http://www.rfdigital.com/shop/index.html|RFDuino]], 0.6" x 0.6", [[http://www.mouser.com/ProductDetail/RF-Digital/RFD22301/?qs=%2fha2pyFadugNWf53j%2f86uEf%2fd9qK8tBLHEbFqnjCkaFqhYjJ63mw1A%3d%3d|$17.99]], [[http://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=48872|$14.99]] :!:

=== w/o BLE ===
  * [[http://digistump.com/products/109|DigiSpark Pro]], 1.1" x 0.72", $10.
  * [[https://femto.io/collections/core/products/femtoduino|Femtoduino]], $35
  * [[https://www.microduino.cc/product/core|Microduino]]
  * [[https://www.sparkfun.com/products/12587|Pro Micro]], 1.3x0.7", $19.95 (official)
  * [[https://www.sparkfun.com/products/11113|Pro Mini]] 0.7x1.3", $3 (clone) to $10 (official) :!:
  * [[https://www.sparkfun.com/products/13614|Qduino Mini]], battery charger, $30.
  * [[https://tinycircuits.com/products/tinyduino-processor-board|Tinyduino]], battery support, goofy I/O $20

=== Other ===
  * Use a Nordic BLE module for everything?

==== Bluetooth ====
=== Classic ===
  * HC-06: $TODO, TODO mA, size is a bit big.
  * HC-05: $TODO, TODO mA, size is a bit big.

=== BLE ===
  * Adafruit [[https://www.adafruit.com/product/2633|Bluefruit LE SPI Friend]], 0.9" x 1", possibly FOSS, $17.50
  * Adafruit [[https://www.adafruit.com/products/2479|Bluefruit LE UART Friend]], 0.8" x 1.26"", possibly FOSS, $17.50
  * Itead [[https://www.itead.cc/hm-11.html|HM-11]], 0.7" x 0.53, $8.50 :!:
  * Itead [[https://www.itead.cc/serial-port-ble-module-master-slave-hm-10.html|HM-10]], 1.1" x 0.5", $6.50
  * ReadBear[[http://redbearlab.com/blemini/|BLEmini]]
  * Seeed [[https://www.seeedstudio.com/item_detail.html?p_id=1803|Bluetooth V4.0 HM-11 BLE Module]], 0.5" x 0.7", $13.
  * Seeed [[https://www.seeedstudio.com/item_detail.html?p_id=1975|Micro BLE Module]], $17.

==== Battery ====
  * [[http://www.ebay.com/itm/5V-Mini-USB-1A-Lithium-Battery-Charging-Lipo-Charger-Module-for-Arduino-A866-MA-/131304520047| Lipo Charger Module for Arduino]]
  * [[http://www.ebay.com/itm/DD08RCRMA-Mini-5V-1A-Lithium-LiPo-Charger-Module-for-Arduino-/182171674023?hash=item2a6a4725a7:g:mssAAOSwzJ5XYPdE| Details about  DD08RCRMA Mini 5V 1A Lithium LiPo Charger Module for Arduino]]