Yesterday I went along to another meeting of the Ipswich Makerspace. This time we were in a larger hall at Holy Trinity Church, just across from the small room we met in last time. We had a few more people turn up, but there’s still plenty of room to grow! This week we had a …
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No post yesterday, as I was attending a “Designing with Freescale” Tech Day. If you have been reading this blog for a while, you will probably know that I like working with Freescale ARM microcontrollers, particularly with their low cost and surprisingly powerful FRDM range of development boards. For once, I had a day where …
After spending the last few days messing with a MCP3002 SPI ADC chip, I’m beginning to wonder if it is not really suitable for my needs after all. Both the SPI libraries I have tried have had problems with excess waiting around transfers, which becomes very significant when each new sample requires a whole new …
Continue reading ‘Reading an analogue value in C on a Freescale Freedom KL25Z’ »
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 …
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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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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