Porting (FFT and traffic lights)

Today seems to have been mostly about porting. I’ve not really developed anything new, but I have learned a lot by moving things around between machines. Yesterday I was a little disappointed with the un-tuned performance of the FFT code I had found and got running on the Freescale Freedom KL25Z, so I decided to …

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First trial of fourier transform on a KL25z

Progressing with my attempt to record and process ultrasonic sounds, I have spent this evening with a trial version of a fast fourier transform (FFT) on the KL25z ARM board. My hope is that if I can get it running fast enough and well enough, I can offload that part of the work to this …

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Ipswich game developers and hackspace

Despite a head buzzing with ideas for things to do with the interesting combination of Raspberry Pi and Freescale KL25z, I had no time to play with them this evening. I had a meeting to go to! I mentioned in my discussion of the Ipswich technology scene that I had discovered a group of people …

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Using Raspberry Pi with a Freescale KL25z

In my continuing quest to get ultrasonic sound information in to a Raspberry Pi so I can do interesting stuff with bat sounds, one of the candidate devices I have identified is the Freescale Freedom KL25z board. Unlike the MCP3002 that I tried to connect to recently, this is not just an analogue to digital …

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Raspberry Pi as a node in a loose network of devices

The more I think about it, the more fascinating the possibilities of the Raspberry Pi become. It occupies a really interesting spot between traditional embedded controllers like Arduino, pics and the like at one end, and “proper” computers at the other. It has enough GPIO to do some of the things the embedded controllers can …

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Pirates and SPIs

“Pirates and SPIs” sounds like a cheesy adventure story, but I’m afraid it’s more likely to be a serial than an exciting drama. A few days ago I had a delivery of some components I had ordered, including a MCP3002 analogue to digital converter. The data sheet for this device claims that it can do …

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Not just Raspberry Pi – playing with an Arduino

I have had an Arduino board sitting in one of my electronics boxes for months. While chatting with an ex colleague yesterday evening, it occurred to me that I had never actually done anything with it. Although it may seem that Arduino and Raspberry Pi are in some sense competitors, I’m seeing more and more …

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The Ipswich technology “scene”

No playing with Raspberry Pi hardware this evening. Instead I went out into the real world and actually talked to people! Of course some of that talking ended up being about Raspberry Pi, Arduino and the like… I live in Ipswich, the county town of Suffolk, and the reason for all this exercise was the …

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HotPi part two, software frustration

I suppose I should know better than to announce what I plan to do the next day. In yesterday’s post I made a lot of progress with the HotPi board and was looking forward to having fun with colour LED control and IR sensing. Unfortunately I made hardly any progress, and ended the evening not …

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HotPi multi-purpose board

This is turning out to be a great week for new stuff. Yesterday I got a package of goodies from China and today I got a HotPi board from local Raspberry Pi specialists “The Pi Hut”. The board was funded by a kickstarter project. Unfortunately I did not know about it until after the kickstarter …

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