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    # default session will start xmonad
    xsession = {
      enable = true;
      windowManager = {
        xmonad = {
          enable = true;
          enableContribAndExtras = true;
          extraPackages = self: [
            self.xmobar self.xmonad-contrib
          ];

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# To build, use:
# For https://github.com/NixOS/nixpkgs/pull/68265: works (building image
# though)

# NIXPKGS_HOME=$HOME/repo/public/nixpkgs
# NIXPKGS_CONFIG=$HOME/repo/private/nixos/rpi4/sd-image-rpi4.nix
# NIX_PATH="nixpkgs=$NIXPKGS_HOME" \
#   nix-build '<nixpkgs/nixos>' -I nixos-config=$NIXPKGS_CONFIG -A config.system.build.sdImage

# For: https://github.com/NixOS/nixpkgs/pull/70796: does not work with uboot yet

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local 192.168.2.0 # SWAP THIS NUMBER WITH YOUR RASPBERRY PI IP ADDRESS
dev tun 
proto udp #Some people prefer to use tcp. Don't change it if you don't know.
port 1194 
ca /etc/openvpn/easy-rsa/keys/ca.crt 
cert /etc/openvpn/easy-rsa/keys/Server.crt # SWAP WITH YOUR CRT NAME
key /etc/openvpn/easy-rsa/keys/Server.key # SWAP WITH YOUR KEY NAME
dh /etc/openvpn/easy-rsa/keys/dh1024.pem # If you changed to 2048, change that here!
server 10.8.0.0 255.255.255.0 
# server and remote endpoints 

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#!/bin/bash 
 
# Default Variable Declarations 
DEFAULT="Default.txt" 
FILEEXT=".ovpn" 
CRT=".crt" 
KEY=".3des.key" 
CA="ca.crt" 
TA="ta.key" 

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Description

This simple script will take a picture of a whiteboard and use parts of the ImageMagick library with sane defaults to clean it up tremendously.

The script is here:

#!/bin/bash
convert $1 -morphology Convolve DoG:15,100,0 -negate -normalize -blur 0x1 -channel RBG -level 60%,91%,0.1 $2

Results

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package scalawebapp

import com.sun.net.httpserver.{HttpExchange, HttpHandler, HttpServer}
import java.net.InetSocketAddress
import scala.concurrent.Future
import scala.concurrent.ExecutionContext.Implicits.global
import scala.util.{Failure, Success}

class MyHttpServer(port: Int = 8080) {

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;; adopted from http://www.datomic.com/company/resources/getting-started
;; Clojure 1.4.0

;; user=> 
(use '[datomic.api :only [q db] :as d])
;;=> nil

;; user=> 
(doc d/q)
;; -------------------------

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(use '[clojure.core.match :only [match]])

(defn evaluate [env [sym x y]]
  (match [sym]
    ['Number]   x
    ['Add]      (+ (evaluate env x) (evaluate env y))
    ['Multiply] (* (evaluate env x) (evaluate env y))
    ['Variable] (env x)))
    
(def environment {"a" 3, "b" 4, "c" 5})

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;; time
(def short-pulse 100)
(def long-pulse 250)
(def letter-delay 500)

;; pin number
(def pin-led 13)

(defn blink "Given a board and time, make the led blink a given time"
  [board time]

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(def device-board "/dev/ttyACM0")

;; this is a limitation on the underlying lib clodiuno uses. Indeed, it searches only for /dev/ttySxx serial devices
;; and on ubuntu GNU/Linux it's named /dev/ACM0
(System/setProperty "gnu.io.rxtx.SerialPorts" device-board)

;; now declaring the board
(def board (arduino :firmata device-board))

;; the led must be set in output mode