RPi.GPIO basics 2 – how to check what Pi board Revision you have

 Input and Output, interfacing, python programming, raspberry pi  27 Responses »
Jul 122013
 
RPi.GPIO basics 2 – how to check what Pi board Revision you have

It all started in September 2012. The Raspberry Pi Foundation went and made some improvements to the Pi. How dare they!! ;) Seriously, though, there were some significant improvements to the Pi and a Rev 2 version was launched with double the RAM and some other changes/additions/improvements. This threw up some minor headaches for developers because some of the GPIO pinouts were changed and some new GPIO ports were made available on a brand new “solder it yourself if you want it” header called P5 (see the leaning header of Pi5a) GPIO 0 became GPIO […more…]

RPi.GPIO basics 1 – how to check what RPi.GPIO version you have

 Input and Output, interfacing, python programming, raspberry pi  15 Responses »
Jul 112013
 
RPi.GPIO basics 1 - how to check what RPi.GPIO version you have

It struck me the other day that I’ve published some fairly advanced RPi.GPIO tutorials, (e.g. interrupts and PWM) but not done anything more basic, apart from the Gertboard examples. So here’s an attempt to remedy that situation. Over the next few days, we’re going to have a walk around Ben Croston’s RPi.GPIO, which is now at version 0.5.3a. Some of this stuff may be new to you even if you’ve been using RPi.GPIO’s more advanced features, so it’s worth having a look. What is RPi.GPIO? It’s an easy way of controlling the Pi’s General Purpose […more…]

Announcing RasPi Videos Google+ Community

 raspberry pi  No Responses »
Jul 032013
 
Announcing RasPi Videos Google+ Community

I’d like to introduce a new Raspberry Pi related Google Plus community. It’s called RasPi Videos and it’s for sharing and discussing videos about the Raspberry Pi. It’s very small at the moment – there’s just 10 of us at the time of publication, but amongst those 10 we’ve got some fabulous Raspberry Pi bloggers and vloggers… Who? Matthew Manning – Raspberry Pi Beginners. A top Raspberry Pi vlogger. Carrie Anne Philbin – Geek Gurl Diaries. Teacher extraordinaire, vlogger and blogger, champion of getting more girls into coding. (This is much needed! If you could […more…]

FLIRC – a programmable USB Media centre controller receiver

 Review  13 Responses »
Jun 272013
 
FLIRC - a programmable USB Media centre controller receiver

Jamie from the Pi Hut sent me a FLIRC controller for review. What is it? It’s a USB dongle that can be programmed to receive signals from pretty much any infra-red remote control that you may have lying around. And you can then use this to control your Raspberry Pi based* media centre (XBMC, OpenELEC, RaspBMC). Simple Setup Programming the remote controller needs another computer. But once programmmed, FLIRC works perfectly with the Pi. It can’t currently be programmed on the Pi itself, but there are setup utilities for Windows, Linux (x86) and Mac. So, […more…]

RasPiCamCorder 2 – standalone raspberry pi camcorder with buttons, screen and DropBox capability

 Electronics, python programming, Raspberry Pi Camera, Raspberry Pi Hardware  49 Responses »
Jun 242013
 
RasPiCamCorder 2 - standalone raspberry pi camcorder with buttons, screen and DropBox capability

This blog is about the very much improved version 2 of the RasPiCamcorder. I originally built a quick and dirty free-standing camcorder two days after the Raspberry Pi camera was launched. I was in a hurry, as there was a Cambridge Jam two days later. Major novelty factor. It worked ok and it looks like this… Now we need buttons Later on I thought it’d be nice to have one that booted straight into camcorder mode and had buttons to control it with, so you don’t need an additional device to use it. I’ve also […more…]

Testing RS 5200 mAh USB lithium battery pack as a UPS

 Raspberry Pi Hardware, Review  9 Responses »
Jun 222013
 
Testing RS 5200 mAh USB lithium battery pack as a UPS

At the end of my previous blog post, I mentioned that I was going to test the large pack to see if it was suitable as an uninterruptable power supply (UPS). Since it can be charged while being used, it seemed reasonable to see if it works for this function. Three days testing So I decided to put it on test for three days. Those three days ended at 9 am this morning, although I’ve still left it running. The pack has been powering the Pi, while the pack itself is connected to my 1 […more…]

Pi duration tests and review of two new lithium battery packs

 python programming, Raspberry Pi Hardware, Review  52 Responses »
Jun 192013
 
Pi duration tests and review of two new lithium battery packs

I’ve got a couple of new battery packs in from RS. As part of my testing, I wanted to see how long they could power a Pi at idle, with nothing but the battery pack and an Edimax wifi dongle connected. I know how much power this uses because I’ve made measurements in the past. Model B with just Edimax = 2.0 Watts at idle Model A with just Edimax = 0.81 Watts at idle (included for completeness – this test is on model B) I just want to know roughly how long it lasts […more…]

Automatic Exposure Compensation Testing for the Pi Camera

 Electronics, python programming, Raspberry Pi Camera, Raspberry Pi Hardware  6 Responses »
Jun 162013
 
Automatic Exposure Compensation Testing for the Pi Camera

In the 4 weeks since the Pi camera came out, I’ve spent a fair amount of time testing and fiddling with different things. I’ve also made two RasPiCamcorders – I hope to document the Mk2 version soon. It’s the reason I haven’t blogged much in the last week. I’ve been working on the hardware and software for it. One thing I hadn’t done until this week was test out the various settings for exposure compensation and white balance. Previously, I’d only used the automatic settings, which work pretty well. But there are some circumstances where […more…]

Part 2 – Raspberry Pi Camera stills VS video, Old VS New – resolution comparison

 Raspberry Pi Camera, Raspberry Pi Hardware, Review  16 Responses »
Jun 062013
 
Part 2 - Raspberry Pi Camera stills VS video, Old VS New – resolution comparison

In the previous comparison I did a week or two ago, the resolution of video and stills output was compared. With respect to reading a car license plate from across the street, there was precious little to choose between the output. With the latest release of the camera drivers, (sudo apt-get update && sudo apt-get upgrade) I took the opportunity to run the test again with both old and new drivers. The most noticeable change is that the field of view of the stills is much greater. It transpired that the previous stills output was […more…]

Nine days’ weather in one minute. Time-lapse video with Raspberry Pi Camera

 Raspberry Pi Camera  17 Responses »
Jun 022013
 
Nine days' weather in one minute. Time-lapse video with Raspberry Pi Camera

I just got back from a week in France. While I was away I had a Raspberry Pi camera shoot a photo of the garden every ten minutes. I set it on for ten days, the day before we left. It still has a day or so to run, but I FTPed the first 1300 .jpg files from my Pi while it’s still running and made them into a video using Videopad. (You can also do this natively on the Pi with FFMPEG, but I haven’t played with that yet.) The subject matter isn’t the […more…]

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