freegroup

from gpiozero import LED
from time import sleep

step = LED(4)
dir = LED(3)

step = LED(17)
dir = LED(18)

wait = 0.000051

freegroup

"""
#Installing v4l-utils (debian) gives one the handy v4l2-ctl command:

$ v4l2-ctl --list-devices
HPigh Definition Webcam (usb-0000:00:14.0-11):
    /dev/video2

UVC Camera (046d:0821) (usb-0000:00:14.0-13):
    /dev/video0

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2018/12/06 20:40:09 - $0=10 (step pulse, usec)
2018/12/06 20:40:09 - $1=25 (step idle delay, msec)
2018/12/06 20:40:09 - $2=0 (step port invert mask:00000000)
2018/12/06 20:40:09 - $3=5 (dir port invert mask:00000101)
2018/12/06 20:40:09 - $4=0 (step enable invert, bool)
2018/12/06 20:40:09 - $5=0 (limit pins invert, bool)
2018/12/06 20:40:09 - $6=0 (probe pin invert, bool)
2018/12/06 20:40:09 - $10=3 (status report mask:00000011)
2018/12/06 20:40:09 - $11=0.020 (junction deviation, mm)
2018/12/06 20:40:09 - $12=0.002 (arc tolerance, mm)

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// use shift registers(74HC595) to control an insane amount of digital inputs.
// https://www.youtube.com/watch?v=nXl4fb_LbcI
#include <SPI.h>
byte Input, Output, Check=1;
int j;
void setup(){
  pinMode(13, OUTPUT);//clock
  pinMode(11, OUTPUT);//data
  pinMode(4, OUTPUT);//latch
  pinMode(2, INPUT);//Input from buttons

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//
//
double distance_on_geoid(double lat1, double lon1, double lat2, double lon2) {

	// Convert degrees to radians
	lat1 = lat1 * M_PI / 180.0;
	lon1 = lon1 * M_PI / 180.0;

	lat2 = lat2 * M_PI / 180.0;
	lon2 = lon2 * M_PI / 180.0;

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#!/bin/bash
# Retrieve AWS instrance's commonly used metadata. Require curl.
# ./get-metadata help
# ./get-metadata id
 
# Input is case insensitive; format to uppper case to generate self-help page.
info=${1^^}
meta_data_url=http://169.254.169.254/latest/meta-data/
roleProfile=$(curl -s http://169.254.169.254/latest/meta-data/iam/info \
    | grep -Eo 'instance-profile/([a-zA-Z.-]+)' | sed 's#instance-profile/##')