alex

Alex Eames is the founder, owner and main contributor to RasPi.TV more information about him can be found in his Google+ profile.

Feb 252015
 

Mainly video today. A little video showing a few simple examples of the sort of things you can do with the RasPiO Duino. Obviously you can do much more sophisticated things too. My next step will be to control the speed of the LEDs using the light sensor and the analog inputs. Endless fun, and useful too, when you think that an LED could represent any device you wanted to control… Don’t forget to check out the RasPiO Duino KickStarter, which finishes in a few days,

Feb 242015
 
Updated Pi Family Photo to include Pi 2 B

Obviously I’ve been fairly pre-occupied recently with the RasPiO Duino kickstarter (2 weeks in, just 1 week to go). But within the last week, at least 3 people have asked me if I’ve updated my “Raspberry Pi Family Photo” to include the new Pi2 model B. I realised, last week, when Zak Zebrowski, Matt Manning and Carrie-Anne all asked me about it, that “it’s become a thing“. I finally made time for it this morning. It takes a couple of hours to dust them all off, lay them out straight and get the lighting right […more…]

Feb 192015
 
Interactive Graphing for the Web on Raspberry Pi using Plot.ly

I’d never done graphing on the Pi or in Python before, but for my KickStarter tracker I wanted something that… was web based would work in Python had decent instructions I could get going with fairly quickly I’d seen Rachel Rayns tweet about using plot.ly for graphing the temperature output of her Chef’s HAT sous vide cooker. I know Rachel loves “human readable instructions”, as do I. So I thought there was a good chance the plotly documentation was good. I decided to give them a shot. Sign Up For An Account The first thing […more…]

Feb 102015
 
Have a go at Arduino Programming on your Raspberry Pi

Today marks a rather special day. I’ve just launched a KickStarter campaign for a brand new Raspberry Pi add-on board called the RasPiO Duino. “Why is that special?” I hear you ask. Well it’s special for us because it’s our first fully solo venture in hardware. Also, my wife Malgosia is coming on-board to help with the kitting, shipping and admin. So it’s the start of a new family enterprise as well, which is all very exciting. It’s been in the works for a long time, but certain other things had to line up before […more…]

Feb 032015
 
Raspberry Pi2 - Power and Performance Measurement

The new Raspberry Pi 2 has a quad-core CPU (BCM2836), but it costs the same as the previous B+. All that extra CPU power isn’t a completely free lunch though. If you use it, it’ll cost you slightly more electrical power than the B+. But how much? That’s what we’re here to look at. In my testing, hammering different numbers of cores in parallel, it worked out at roughly 50 mA (250 mW) per core. But before I show you the full results, let me back up and show you how we got them because […more…]

Feb 022015
 
Raspberry Pi 2 - the New Quad-core A7 Pi2

New Raspberry Pi 2 Launched The Raspberry Pi 2 is out today. What? They only just launched the B+ and A+? I know! But you know tech companies like to spring surprises on us. It’s remarkably similar to the B+ in layout (in fact you might say the B+ was a ‘stepping stone’ towards Pi2) but has some significant upgrades… So What’s New With The Pi 2? Actually the video covers it pretty well, but if you prefer to read… It’s a quad-core A7 CPU with the same VC4 GPU as the original Pi. It […more…]

Jan 282015
 
Hacking HDMIPi Power Switch with Feedback

In a recent post, I showed you how to hack the HDMIPi power switch so that you can turn the screen on and off from the Pi. But no sooner had I done that than my friend Peter Onion, wondering if there was a way to detect if the LCD is on or off in case it gets “out of sync”, tweeted this… @RasPiTV Is there a switched 3v3 supply to the LCD pannel ? Wire that to a GPIO input pin ? Or can you test monitor "on" via hdmi ? — Peter Onion […more…]

Jan 232015
 
Raspberry Pi Family Photo Update - The Red B+ and 256 Mb Rev 2 B

Back in November 2014 I wrote about the various production revisions of Raspberry Pi. I also published a “family photo” of the 10 different kinds of Pi I then owned. Since then, I’ve been given a 256 Mb Rev 2 model B by George Dowds of ThePiZone (thank you George) and I bought myself a red B+ from AliExpress. So now there are 12 Pi in the family photo, I thought it was worth a reshoot. If you fancy a closer look, you can click the below image for a higher resolution version. I set […more…]

Jan 142015
 
Hacking HDMIPi Power Switch

The HDMIPi driver board is a fairly complex design. I didn’t design it, although I did have some input into the feature list. I don’t fully understand how it works (something to do with the magic white smoke in the chips, I think), but I have messed around with it probably as much as anyone. Recently, several people have been asking if we can switch HDMIPi on and off programmatically from the Pi. Göran Roseen wants to be able to do it with this HDMIPi based clock… @Raspberry_Pi wall clock with go-to-school indicator that goes […more…]

Jan 052015
 
Documentation and Commenting Your Code

From observation of the computer industry going back to 1987, when I did a pre-university year at IBM Scientific Centre in Winchester, it seems that the very brightest and best programmers (software creatives) are often not very good at or not very keen on documenting their work. I think the reason for this is often misunderstood. Poor documentation is a source of great consternation in the world of Linux. In fact it’s a large part of the raison d’être for RasPi.TV. We, the users, often feel that the geniuses who write awesome software can’t be […more…]