todgru

// to log an entire object without trucated depth:
console.dir(myDeeplyNestedObject, { depth: null });

todgru

From: https://edwilliams.org/sunrise_sunset_algorithm.htm

Sunrise/Sunset Algorithm
Source:
	Almanac for Computers, 1990
	published by Nautical Almanac Office
	United States Naval Observatory
	Washington, DC 20392

Inputs:

todgru

const arr = [1, 2, 3, 4, 5, 6];
const iter = arr[Symbol.iterator]();
const foo = i => {
  const v = i.next();
  if (v.done) return "done!";
  console.log("next!", v.value);
  return foo(i);
};
foo(iter);

todgru

sudo service bluetooth status  # Verify bluetooth is active.
sudo bluetoothctl              # Lauch bluetooth subshell.
agent on                       # [No idea what this does.]
default-agent                  # [No idea what this does.]
scan on                        # Displays a list of available devices.
pair XX:XX:XX:XX:XX:XX         # This prepares a potential connection, the X's represent your device ID
# A "PIN code" will be displayed, type it on the keyboard and press "enter".
trust XX:XX:XX:XX:XX:XX        # Adds device to trusted devices, this survives reboot.
connect XX:XX:XX:XX:XX:XX      # Connect to the device now.
exit                           # Return to previous shell.

todgru

• after image is flashed using Etcher, cd /Volumes/boot.
• Then add ssh file to root. touch ssh.
• connect network cable between os x computer and raspberry pi. boot the raspberry pi.
• wait a minute.
• then ssh pi@raspberrypi.local

That's it. No need for a screen, keyboard or any other device to get into the pi. :)

todgru

meteor shower intensity https://fireballs.ndc.nasa.gov/cmor-radiants/

todgru

good link to running ntp time server on rpi with gps https://robrobinette.com/pi_GPS_PPS_Time_Server.htm

todgru

trim an mp3

I record mp3s from a few streams. Sometimes the recordings do not stop on schedule. This command allows me to trim or trucate the mp3 file.

ffmpeg -i infile.mp3 -vn -acodec copy -ss 00:00:00 -t 01:00:34 outfile.mp3

installation on ubuntu 14.04

todgru

function foo() {
  console.log('foo');
}

function bar() {
  foo();
}

module.exports = {
  foo,

todgru

paclink-unix

install ax25 https://gist.github.com/todgru/b2e742fea3991c6c242c5ea17b4cfaaf

apt-get install postfix postfix libdb-dev libglib2.0-0 zlib1g-dev libncurses5-dev libdb5.3-dev libgmime-2.6-dev -y
git clone https://github.com/nwdigitalradio/paclink-unix
cd paclink-unix/
./autogen.sh --enable-postfix