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 wanted to have a go at writing software to drive the GPIO pins, but didn’t want to go to the trouble of building my own hardware. Not only would that be fiddly, but if (when) something did …

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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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