Joseph Coombe josephcoombe

USB 'web' cameras vs. ethernet and network cameras

Cost and feature/performance trade-offs

Built-in laptop camera

$ lsusb
Bus 002 Device 004: ID 0a5c:5800 Broadcom Corp. BCM5880 Secure Applications Processor
Bus 002 Device 002: ID 8087:8000 Intel Corp.

Running rqt_smach (smach_viewer) with ROS Kinetic

Hello everyone!

As we needed Smach for an university project I decided to take a look in porting rqt_smach / smach_viewer to ROS Kinetic. Some things may still be broken but at least it is working at all!

NOTE: This is kind of work in progress - I'd love to get any feedback and will merge updates if you want to contribute any fixes! I will try to get into contact with jbohren but for the most recent issues and pull requests he was not willing to cooperate - that's surely one of the reasons why there is no kinetic support so far

This file is based on the instructions made by @jbohren in this file: rqt_smach.md - which is hard to find on the internet.

Squashing Git Commits

The easy and flexible way

This method avoids merge conflicts if you have periodically pulled master into your branch. It also gives you the opportunity to squash into more than 1 commit, or to re-arrange your code into completely different commits (e.g. if you ended up working on three different features but the commits were not consecutive).

Note: You cannot use this method if you intend to open a pull request to merge your feature branch. This method requires committing directly to master.

Switch to the master branch and make sure you are up to date:

	# Install wstool and rosdep.
	sudo apt-get update
	sudo apt-get install -y python-wstool python-rosdep ninja-build

	# Create a new workspace in 'catkin_ws'.
	mkdir cartographer_ws
	cd cartographer_ws
	wstool init src

	# Merge the cartographer_ros.rosinstall file and fetch code for dependencies.

	"""
	Minimal character-level Vanilla RNN model. Written by Andrej Karpathy (@karpathy)
	BSD License
	"""
	import numpy as np

	# data I/O
	data = open('input.txt', 'r').read() # should be simple plain text file
	chars = list(set(data))
	data_size, vocab_size = len(data), len(chars)

	#!/bin/bash
	#
	# git-mv-with-history -- move/rename file or folder, with history.
	#
	# Moving a file in git doesn't track history, so the purpose of this
	# utility is best explained from the kernel wiki:
	#
	# Git has a rename command git mv, but that is just for convenience.
	# The effect is indistinguishable from removing the file and adding another
	# with different name and the same content.

	#!/bin/bash

	# store the current dir
	CUR_DIR=$(pwd)

	# Let the person running the script know what's going on.
	echo "\n\033[1mPulling in latest changes for all repositories...\033[0m\n"

	# Find all git repositories and update it to the master latest revision
	for i in $(find . -name ".git" \| cut -c 3-); do

	#!/usr/bin/python

	# All SSH libraries for Python are junk (2011-10-13).
	# Too low-level (libssh2), too buggy (paramiko), too complicated
	# (both), too poor in features (no use of the agent, for instance)

	# Here is the right solution today:

	import subprocess
	import sys