olha... uma ponte barata...

https://nodemcu.readthedocs.io/en/master/en/modules/wifi/

shell nano connect

#!/bin/sh
#
# usa: usb serial arduino
#
# connects to arduino as explained at:
#
#  https://playground.arduino.cc/Interfacing/LinuxTTY
#
usbSerialArduino () {
  #
  # configure serial port
  #
  stty -F "$1" cs8 9600 ignbrk \
    -brkint -icrnl -imaxbel -opost -onlcr \
    -isig -icanon -iexten -echo -echoe -echok \
    -echoctl -echoke noflsh -ixon -crtscts ;
  #
  # conect to serial port
  #
  busybox microcom -s 9600 "$1" ;
  #
} ;
#
usbSerialArduino /dev/ttyUSB${1:-0} ;
#

:)

... and welcome to this house of logic ::: alphabit... :)

  https://youtu.be/mx0Lq-I73kg?t=255

nano pins

https://www.arduino.cc/en/uploads/Main/Arduino_Nano-Rev3.2-SCH.pdf

3 knowledge suggestions...

that you should give a try, at least for the sake of knowing them...

1. haskell language

  why: https://youtu.be/LR8fQiskYII?t=163
    lol: https://www.youtube.com/watch?v=dV_mD3SxViQ

  how: http://learnyouahaskell.com/chapters

  libraries: https://hackage.haskell.org/packages/

  bonus: https://xmonad.org/
    https://www.youtube.com/watch?v=LnX3B9oaKzw

2. blender 3D ++

  why: very nice interface... :)

  how: start with an interface usage tutorial

    then modeling: https://www.youtube.com/results?search_query=blender+modeling+tutorial

  libraries: programmable in python

  bonus: https://www.youtube.com/watch?v=mIiY6aGefvI
    https://www.youtube.com/watch?v=biywY5l_2nU
    https://en.blender.org/index.php/Extensions:2.6/Py/Scripts/Import-Export/Paper_Model

3. solvespace by constraining it

  why: keeps it simple... :)

  how: start here... http://solvespace.com/2d.pl

... and ::: genius ... a math little helper...

... all available on debian... :)

more on fpga's

https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/wp/wp-201406-acceleware-opencl-on-fpgas-for-gpu-programmers.pdf

https://wiki.debian.org/FPGA/

https://wiki.debian.org/FPGA/Altera
https://wiki.debian.org/FPGA/Lattice

https://www.youtube.com/user/alteracorp/playlists

http://www.asic-world.com/verilog/first1.html

http://fpgasoftware.intel.com/

https://llvm.org/devmtg/2010-11/Rotem-CToVerilog.pdf

... some simple boards...

https://www.intel.com/content/www/us/en/programmable/b/nios-bemicro-evaluation-kit.html

http://www.latticesemi.com/icestick

https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=253&No=1140

https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=218&No=1021

keyboard back-light

off :: xset led 3

on :: xset -led 3

2020 update: though on my new keyboard it turns on/off the scroll-lock... o.O?