add initial notes

notes.md

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+# Notes
+
+## Boards
+
+- Raspberry Pi Zero 2 W - cheapest option
+  - No battery charging
+  - Consumes more power even if it had a battery
+
+- ItsyBitsy M4 Express w/ WiFi
+  - Can get the M4 via the Hack Club store
+  - WiFi (Bitsy AirLift) is $15 from AdaFruit, can also be bought on Digikey
+  - WiFi uses a lot of power relatively
+  - No battery charging
+- Adafruit nRF52840 Feather ([link](https://www.adafruit.com/product/4062)) ([digikey](https://www.digikey.com/en/products/detail/adafruit-industries-llc/4062/9843410))
+  - $25
+  - Has Bluetooth - lower energy
+  - Has battery charging built-in
+
+## Displays
+
+- [Various E-ink displays from Adafruit](https://www.digikey.com/en/products/filter/evaluation-boards/expansion-boards-daughter-cards/797?s=N4IgjCBcpmAMVQGMoBcBOBXApgGhAPZQDaIALABxgDM1ArCPtWbQOwCcjIztVXP1CgCZ%2BLQdVG8AbFzLshrOpyZiKZSYNayhdMFPUreDQ4IpddZIWQj4qdMnRn4HNKU-JV2cTgF18AB1QoEABlDABLADsAcxAAX3wAWghoEBRIDBx8IkhSMDohMx84hJAZVPCAE2DkuBsQQOCuVABPf2xggEMAZxQSoA)
+  - 2.13" tri-color looks promising
+  - Or monochrome (more colors vs faster update speeds)
+  - NVM *BAD OPTION*: 3-15 seconds for updates (monochrome vs color), 3 minutes between full refreshes
+    - I don't want to have to code carefully around doing full refreshes
+    - And 3 seconds even isn't great, but is usable
+- [OLED display with controls](https://www.adafruit.com/product/3531)
+- [OLED display with 3 buttons](https://www.adafruit.com/product/4650) ([digieky](https://www.digikey.com/en/products/detail/adafruit-industries-llc/4650/13170952))
+  - 10mA power draw
+  - Any leftover buttons can be user-assignable
+
+## Controls
+
+- Joystick things
+  - [Joystick with button](https://www.adafruit.com/product/512)
+  - [Slim joystick](https://www.adafruit.com/product/2765)
+    - [Breakout board](https://www.adafruit.com/product/3246)
+  - Similar: [PSP 3000 joystick](https://www.adafruit.com/product/444)
+    - Easier to mount?
+  - [5-way switch](https://www.adafruit.com/product/504)
+    - [Cap](https://www.adafruit.com/product/4697)
+- Possible control scheme:
+  - Menu/list system
+  - Up and down to go through the list
+  - Click certain button to engage with sub-menu (like a slider or something)
+  - Left and right to go in and out of sub-menus
+  - Another button to click in sub-menu
+
+## Other
+
+- Headers:
+  - [Short female headers](https://www.adafruit.com/product/2940) ([digikey](https://www.digikey.com/en/products/detail/adafruit-industries-llc/2940/5848449))
+  - [Short male headers](https://www.adafruit.com/product/3002) ([digikey](https://www.digikey.com/en/products/detail/adafruit-industries-llc/3002/6827172))
+- Batteries:
+  - [18650](https://www.adafruit.com/product/1781) - can make a triangle shape so it sits nicely in my desk, 2200mAh (lasts ~36 hrs)
+  - [flat lipo](https://www.adafruit.com/product/3898) - flat and small (lasts ~7 hrs)
+
+## not final but somewhat thought-out and researched plan
+
+- nRF52840 Feather
+- 128x64 OLED FeatherWing
+- Some kind of joystick
+- Headers, obviously
+- 3d print some decent caps for the buttons