Aug 212015
 
Witty Pi Full Review

Back in July I did a mailbag video and got you guys to vote on which item I should do a more in-depth review of. WittyPi got about 50% of the vote by the time I had to make the decision. So here is the UUGear WittyPi review. WittyPi is an A+/B+/Pi2B add-on that gives you a safe on-off switch and enables timed shutdowns and startups of your Raspberry Pi. It has a battery-backed realtime clock (RTC) that controls the startup times and allows your Pi to retain the correct time even if not connected […more…]

Aug 122015
 
RPi. GPIO GPIO.getmode() function

Another new RPi.GPIO feature that I discovered last week is GPIO.getmode(). This appeared in RPi.GPIO 0.5.11 and allows you to query RPi.GPIO to see whether GPIO.setmode() has been set up as BCM, BOARD, or UNSET mode. This could be useful if you are running a suite of scripts or modules which work together. GPIO.getmode() returns… -1 if GPIO.setmode() is not set 11 if GPIO.setmode(GPIO.BCM) is active 10 if GPIO.setmode(GPIO.BOARD) is active Below you can see a live python session showing what you get when you use GPIO.getmode() with different modes set… Why Did You Bother […more…]

Aug 102015
 
RPI.GPIO New Feature GPIO.RPI_INFO replaces GPIO.RPI_REVISION

In RPi.GPIO 0.5.10 (we’re now on 0.5.11) Ben Croston ‘deprecated’ GPIO.RPI_REVISION, which used to be the preferred way to find out what kind of Raspberry Pi board a program was running on. This was a useful feature to make it possible to write software that will work on any Pi, regardless of how its GPIO pins are arranged. To date, we’ve had three different GPIO pin header layouts for the standard Raspberry Pis (four if you count the compute module). But GPIO.RPI_REVISION has been deprecated (fallen out of favour) because there is now something better. […more…]

Jun 152015
 
Flappy Brain EEG controlled game by Albert Hickey @winkleink

At Last week-end’s Cambridge Jam I met Albert Hickey @winkleink, who showed me this extremely cool brain-wave controlled version of Flappy Bird. This is a video post, so I’ll let the video do the talking… Albert runs the Egham Raspberry Jam and his blog can be found here. He’s written the project up and shared the code there. @RasPiTV Thank you for doing this. Will have all set up to play at @EghamJam on the 12th of July. http://t.co/t99JvPNT8d — Winkleink (@winkleink) June 15, 2015

May 182015
 
Twitter-controlled RasPiO Duino based Pan and Tilt, Tweeting, DropBoxing, Raspberry Pi Security Camera

Around about this time three years ago, I bought and installed five EasyN pan-and-tilt ip cameras to keep an eye on various viewpoints of our houses in the UK and Poland. I think they were about £45 each on Amazon. They’re not too hard to set up and they work tolerably well. The main downside is that their resolution is only 640 x 480 pixels, which is not enough to read a car numberplate from across the street. It’s fairly poor resolution, but you can see something. The colours are a bit washed out too […more…]

Mar 292015
 
RasPiO Duino as a Lipo Monitor

I’ve been using lithium polymer (lipo) batteries since 2006, when I nervously shelled out £30 for a 3 cell 1600 mAh 10C HiModel lipo to power my EasyStar RC plane. I also spent about the same on a charger and balancer for it. Thankfully, all these things have come down a lot in price since then. I don’t think I’d expect to pay much more than £10 for an equivalent battery now. Typical lipo batteries for large devices have multiple cells. A lipo cell has a no-load resting voltage of 4.2 V when fully charged […more…]

Mar 092015
 
Pete Lomas Talks to Alex Eames at the Raspberry Pi Birthday Weekend

At the Raspberry Pi 3rd Birthday weekend, I met Pete Lomas for the first time. Pete is a Founding Trustee of the Raspberry Pi Foundation (in his spare time). For his day job, he’s Director of Engineering at Norcott Technologies. Pete has been involved in the Raspberry Pi story since very near the beginning. He designed the original model B & A production PCB. I had a chance to have a chat with him on day 2 of the Raspberry Pi birthday celebrations. If you’re a Pi geek or interested in how it all happened, […more…]

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,

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 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…]