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Roomba exposes both unregulated battery voltage (+14v, GND), and a 5v TTL serial interface via it's mini-din connector. Also exposed is an active-low signal pin called DD (Device Detect) that can be used to wakeup a sleeping/off Roomba.

Rpi has a 3.3v TTL serial interface exposed on it's header pins. Also, Rpi exposes +5v, +3.3v, GND, as well as GPIO pins.

We can leverage the Roomba battery to power the Rpi by adding a voltage regulator circuit between the roomba min-din battery pins and the 5v/GND power pins on the Rpi header. I've chosen the following part from the RC community (called a UBEC Universal Battery Elimination Circuit) to power the Rpi: this or this

To convert the 5v Roomba signals (both serial and DD) to/from 3.3v, I've chosen this:

THIS GIST WAS MOVED TO TERMSTANDARD/COLORS REPOSITORY.

PLEASE ASK YOUR QUESTIONS OR ADD ANY SUGGESTIONS AS A REPOSITORY ISSUES OR PULL REQUESTS INSTEAD!

ANNOUNCEMENT

I have moved this over to the Tech Interview Cheat Sheet Repo and has been expanded and even has code challenges you can run and practice against!

\

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

	@echo off

	:: Execute the PS1 file with the same name as this batch file.
	set filename=%~d0%~p0%~n0.ps1

	if exist "%filename%" (
	PowerShell.exe -NoProfile -NonInteractive -NoLogo -ExecutionPolicy Unrestricted -Command "& '%filename%'"

	:: Collect the exit code from the PowerShell script.
	set err=%errorlevel%

	using System;
	using System.Collections.Generic;
	using System.IO;
	using System.Linq;
	using System.Text;

	namespace SuffixTreeAlgorithm
	{
	public class SuffixTree
	{

	#!/usr/bin/python
	#based on the ideas from http://synack.me/blog/implementing-http-live-streaming
	# Updates:
	# - 2024-04-24: Apply suggestions from @Pin80
	# Run this script and then launch the following pipeline:
	# gst-launch videotestsrc pattern=ball ! video/x-raw-rgb, framerate=15/1, width=640, height=480 ! jpegenc ! multipartmux boundary=spionisto ! tcpclientsink port=9999
	#updated command line
	#gst-launch-1.0 videotestsrc pattern=ball ! videoconvert ! video/x-raw, framerate=15/1, width=640, height=480 ! jpegenc ! multipartmux boundary=spionisto ! #tcpclientsink port=9999

	from multiprocessing import Queue

	Latency Comparison Numbers (~2012)
	----------------------------------
	L1 cache reference 0.5 ns
	Branch mispredict 5 ns
	L2 cache reference 7 ns 14x L1 cache
	Mutex lock/unlock 25 ns
	Main memory reference 100 ns 20x L2 cache, 200x L1 cache
	Compress 1K bytes with Zippy 3,000 ns 3 us
	Send 1K bytes over 1 Gbps network 10,000 ns 10 us
	Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD

	--langdef=coffee
	--langmap=coffee:.coffee
	--regex-coffee=/(^\|=[ \t])class ([A-Za-z_][A-Za-z0-9_]+\.)([A-Za-z_][A-Za-z0-9_]+)( extends .+)?$/\3/c,class/
	--regex-coffee=/^[ \t](module\.)?(exports\.)?@?(([A-Za-z][A-Za-z0-9_.])+):.[-=]>.$/\3/m,method/
	--regex-coffee=/^[ \t](module\.)?(exports\.)?(([A-Za-z][A-Za-z0-9_.])+)[ \t]=.[-=]>.*$/\3/f,function/
	--regex-coffee=/^[ \t](([A-Za-z][A-Za-z0-9_.])+)[ \t]=[^->\n]$/\1/v,variable/
	--regex-coffee=/^[ \t]@(([A-Za-z][A-Za-z0-9_.])+)[ \t]=[^->\n]$/\1/f,field/
	--regex-coffee=/^[ \t]@(([A-Za-z][A-Za-z0-9_.])+):[^->\n]*$/\1/f,static field/
	--regex-coffee=/^[ \t](([A-Za-z][A-Za-z0-9_.])+):[^->\n]*$/\1/f,field/
	--regex-coffee=/((constructor\|initialize):[ \t]\()@(([A-Za-z][A-Za-z0-9_.])+)([ \t]=[ \t][^,)]+)?/\3/f,field/

	Raspian
	-Resize sdcard
	-Install mono
	-Install DNVM
	-Install DNVM Execution Env
	-Download ASPNET samples
	-Resore packages for HelloWorldMvc
	-Run HelloWorldMvc

	sudo raspi-config