Wes McKinney Raspberry Pi Part 1 - Introduction The PiFace Digital I/O card connects to your Pi's 26-way IDC header and sits over the Pi to provide a compact interface to digital input and output ports. PiFace provides: 8 digit input ports - presented on a nine-way terminal strip, these will detect open circuit or closed circuit with respect to a common ground connection. Hover your mouse over the picture of the PiFace to see a description of each main component. The easiest way to install the PiFace software and associated system settings is to use PiFace's own disk image. There are several jumpers on the PiFace boards and these have the following purposes: JP1 and JP2 - these jumpers set the board address so that up to four boards can be used. While the two relays are rated at 10A 250V AC, documentation elsewhere states that the maximum voltage should be limited to 20V - presumably because of the proximity of the relay connections and control circuits. Using C I decided to use C to run my PiFace.
Official BioLite Site | Home of the CampStove - Free Shipping Quant Pythonista - A blog about scientific Python, quant finance, statistics, data analysis, and hacking of all kinds TL;DR I’ve finally gotten around to building the high performance parser engine that pandas deserves. It hasn’t been released yet (it’s in a branch on GitHub) but will after I give it a month or so for any remaining buglets to shake out: A project I’ve put off for a long time is building a high performance, memory efficient file parser for pandas. The existing code up through and including the imminent pandas 0.9.0 release has always been makeshift; the development focus has been on parser features over the more tedious (but actually much more straightforward) issue of creating a fast C table tokenizer. pandas.read_csv from pandas 0.5.0 onward is actually very fast– faster than R and much faster than numpy.loadtxt– but it uses a lot of memory. Building a good parser engine isn’t exactly rocket science; we’re talking optimizing the implementation of dirt simple O(n) algorithms here. Outside of parser features (i.e. In [3]: ! In [4]: ! Oof.
Draft instructions for getting started with PiFace Digital (full instructions to follow) | PiFace PiFace Digital is one of the quickest and easiest way to connect your Raspberry Pi to the real world. Follow this guide and you’re Raspberry Pi will be reacting to switches and controlling motors and lights in less than ten minutes! PiFace Digital features at a glance:2 changeover relays4 switches8 digital inputs8 open-collector outputs8 LED indicatorsEasy to program in Python, Scratch and CGraphical emulator and simulator Always disconnect the power before connecting anything to your Raspberry Pi or PiFace Digital. Fitting the board PiFace Digital sits neatly above the Raspberry Pi and connects using the expansion connector. Installing Software The fastest way to get started is to download a prepared operating system image and copy it to an SD card. Alternatively, you can install the necessary libraries to your own Raspbian image with the instructions below. Installing the software yourself in Raspbian PiFace Digital communicates to the Raspberry Pi using the SPI interface. sudo reboot 1. 2.
2011 July | Quant Pythonista A couple of weeks ago in my inaugural blog post I wrote about the state of GroupBy in pandas and gave an example application. However, I was dissatisfied with the limited expressiveness (see the end of the article), so I decided to invest some serious time in the groupby functionality in pandas over the last 2 weeks in beefing up what you can do. So this article is a part show-and-tell, part quick tutorial on the new features. Note that I haven’t added a lot of this to the official documentation yet. GroupBy primer GroupBy may be one of the least well-understood features in pandas. Here, the index (row labels) contains dates and the columns are names for each time series. Perform an aggregation, like computing the sum of mean of each group. So there are two tasks: first, grouping the data; second, doing something with the grouped data. So in the above data, let’s say we wanted to group the data by year. In [21]: grouped = df.groupby(lambda x: x.year) Or aggregate like so: Conclusions
thomasmacpherson/piface FAQs Table of Contents: The Raspberry Pi is a credit-card-sized computer that plugs into your TV and a keyboard. It is a capable little computer which can be used in electronics projects, and for many of the things that your desktop PC does, like spreadsheets, word processing, browsing the internet, and playing games. The Raspberry Pi Foundation is a charity, so you can’t buy shares in the company. You can buy a Raspberry Pi from our main distributors, Premier Farnell/Element14 and RS Components/Allied Electronics. The Model A+ costs $20, the Model B+ costs $25, the Pi 2 costs $35, the Pi 3 costs $35, and the Pi Zero costs $5, plus local taxes and shipping/handling fees. You get the Raspberry Pi board itself. The components we buy are priced in dollars, and we negotiate manufacturing in dollars. Raspberry Pi resellers produce some fantastic bundles for people who would rather get everything they need from a single source. Not at the current time. Yes. There is no on/off switch! 10. 11. 12.
Raspberry Pi Want an Extra Slice of Pi? Grab yourself a pi-toppi-top is the upgradable laptop you build yourself. It features a 13” HD screen, built-in trackpad and keyboard and offers over 10 hours of battery life. pi-top makes using a Raspberry Pi easier than ever, and allows you to swap out and replace your old pi board as new upgrades are released. Introducing the pi-topCEEDAvailable in cool grey or funky green the pi-topCEED offers an exciting way to create your own Raspberry Pi-powered desktop computer. Official Raspberry Pi Starter Kit Now you can get all the official Raspberry Pi kit you need to get started in a cool bundle from RS. Raspberry Pi 3 Model B boardWhite power supply with interchangeable heads for use in UK, US, Europe and AustraliaRed and white official Pi caseNOOBS operating system microSD card1m white HDMI 2.0 cableWhite official Raspberry Pi mouse and keyboardPlus the Adventures in Raspberry Pi book RS Pi Kit Setting up your new Raspberry Pi 3 Model B is as easy as Pi
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tutorial sur l’utilisation de cron : plannificateur de tâches de GNU/Linux Cron est un utilitaire commun à toutes distributions Linux et même à unix. Il permet l’execution de programmes / scripts à un temps ou une date spécifiée. Comment démarrer cron Cron est un daemon, ce qui signifie qu’il doit normalement être automatiquement démarré avec votre linux. vous pouvez vérifier son execution avec la commande :malekalmorte@ubuntu:~$ ps -aux|grep cronroot 7928 0.0 0.1 1808 856 ? Ss 11:30 0:00 /usr/sbin/cron1000 16271 0.0 0.0 3432 600 pts/1 D+ 21:33 0:00 grep cron Sur une distribution de type redhat, vous pouvez redémarrer le service avec la commande : service cron restartVous pouvez aussi régler cron pour qu’il soit activé au démarrage de l’ordinateur, avec la commande chkconfig: chkconfig –level 234 cron on Sur une distribution de type Debian, utilisez la commande : /etc/init.d/cron restartEnfin vous pouvez aussi activer cron au démarrage de votre Debian, avec la commande : update-rc.d cron defaults /etc/crontab SHELL est le shell dans lequel sera executé cron.
UNIX / Linux Tutorial for Beginners A beginners guide to the Unix and Linux operating system. Eight simple tutorials which cover the basics of UNIX / Linux commands. Introduction to the UNIX Operating System What is UNIX? Recommended UNIX and Linux books If you wish to continue learning Unix, here is a list of good Unix and Linux books, ranging from beginners to advanced.