Building a MAX7219 LED array

Time for a bit more soldering, I think. I couple of months ago I bought a little MAX7219 LED array kit from ebay for a couple of pounds. They are all over ebay and aliexpress. As kits go it is very simple – a resistor, two capacitors, some sockets and some optional connectors. Soldering it …

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Back to soldering

Yesterday morning my car was at the garage for a service, so I took the morning off work rather than struggle in using public transport only to come straight back again to pick it up. I took the opportunity to break out the soldering iron and construct some Raspberry Pi boards, one of which has …

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Controlling a Slice of Pi/O with Python

I recently got a comment on my article from 1st February about Soldering a Slice of Pi/O asking for some help in programming it in Python. This reminded me that I have not got very far with this little board beyond checking that the Raspberry Pi could see it. So I decided to see what …

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Is there a Raspberry Pi with 4GB in the works?

This is not really a news blog, but I spotted something on a recent video titled “Reuters visits the Raspberry Pi factory” at raspberrypi.org. The picture below is a screenshot from about 2 minutes 17 seconds into the video. It shows a box labelled RASPBERRY PI 4GB U-ICC-005-43 and a photo of a board. (click …

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A possible candidate for analogue input

I’m still looking for a way of getting analogue input into my Raspberry Pi so I can build an ultrasonic “bat detector”. I looked at this a few days ago, and came away disappointed with the slow speed of all the analogue input devices I could find. I think I may have found an answer. …

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My post about board revisions seems to have been quite popular

That’ll teach me to go away for a weekend. It seems my previous post “Automatic Raspberry Pi board revision detection: model A, B1 and B2” was surprisingly popular. It was picked up by several important Raspberry Pi web sites and led to a significant spike in visitors. If you are someone who found their way …

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Why is it so hard to build Raspberry Pi Linux drivers?

A few days ago I complained a bit about the profusion and confusion around the Linux drivers for the PiBorg LEDBorg multi-colour LED. With a bit of renewed energy, I thought I’d have a go at improving the situation by including a test for board revisionin the driver and ensuring that the correct GPIO pins …

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Hardware review: LEDBorg for Raspberry Pi

Introduction A while ago I ordered and received a LEDBorg bright, three-colour LED for my Raspberry Pi. I am a fan of LEDs since I first saw those large LED screens in Seattle, and so this time wanted to have a go at writing software to drive the GPIO pins, but didn’t want to go to …

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How to read Raspberry Pi board revision and memory size

As I mentioned yesterday, I now have some new Raspberry Pi boards to play with, and also some extra hardware. I had planned to spend this evening writing some GPIO code to control the colours and brightness of the LEDborg. I even got as far as plugging it in to one of the boards. Then …

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