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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))
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- ~~[Short male headers](https://www.adafruit.com/product/3002) ([digikey](https://www.digikey.com/en/products/detail/adafruit-industries-llc/3002/6827172))~~ - can just use the included ones instead if we trim them down a bit
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- 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
