# blinky

control your blinkstick via http requests

## requirements

- nodejs
- yarn / npm
- [nvm](https://github.com/nvm-sh/nvm)

**the node-hid module is a bit picky about node.js's version - use node.js 8.x or 15.x**

## setup (as root)

- install nvm  

- to load nvm restart your terminal or `source ~/.nvm/nvm.sh`

- clone the project (to '/opt/blinky')  
`git clone https://git.velvettear.de/velvettear/blinky.git /opt/blinky`

- enter the cloned directory  
`cd /opt/blinky`

- install and switch to a supported node.js version (automatically done via .nvmrc file) 
`nvm install`

- install the required modules  
`npm install`

- switch back to your system's default node.js version
`nvm deactivate`

- execute blinky  
`nvm run 15 blinky.js`

- if you get this error message on linux:  
`Error: cannot open device with path /dev/hidraw0`  
run:  
`echo "KERNEL==\"hidraw*\", SUBSYSTEM==\"hidraw\", ATTRS{idVendor}==\"20a0\", ATTRS{idProduct}==\"41e5\", MODE=\"0666\"" | sudo tee /etc/udev/rules.d/85-blinkstick-hid.rules`  
and reboot your system



## systemd

**for security reasons it is highly recommended to not run blinky with root permissions!**

- create a new system user  
`useradd -U -r -s /usr/bin/nologin node`

- make your install of nvm available to the new user  
`cp -R ~/.nvm /opt/nvm`  
`chown -R node /opt/nvm`

- symlink the provided systemd-service file  
`ln -s /opt/blinky/blinky.service /etc/systemd/system/blinky.service`

- reload systemd-services  
`systemctl daemon-reload`

- enable and start blinky as a systemd-service  
`systemctl enable --now blinky`

- if you don't use nvm otherwise remove it and remove it from your shell-profile  
`rm -rf ~/.nvm`  
`vim ~/.zshrc` 

### scripts

- blinky-feed.sh 
    - gathers various system information (currently temperature only) then converts it to color values and sends it to blinky
    - requirements: bash, bc