Arduino Ultrasonic Anemometer Part 12: Working on an Arduino library

This is just a very brief update on what I’ve been working on the last few days. By now, this blog has caught up with where the project currently stands so the blog posts won’t be quite as frequent as they used to be. When I just started this series I had already worked on this my wind meter project for two months so I had plenty of material I only had to post.

Arduino Ultrasonic Anemometer Shield waiting for software

By the way: If you’re new to my Arduino-based ultrasonic wind meter project, you might want to click here for an overview:

As you can see in my last post, all the hardware is working really beautifully now so I can focus entirely on the software. So far, the software was really basic, just enough to show the hardware is working. That’s changing now. I’m working on a library to handle all the low level stuff, like setting up Timer1 and handling the interrupts.

One advantage of putting all that stuff in a library is that I can write in native assembler (as opposed to inline assember which I find a pain in the arse). Not everything will be written in assember. But the two I interrupt service routines (ISRs) will be. Everything else will be regular C code I guess. told you in an earlier post that my ISRs were surprisingly slow: around 5us for the most trivial tasks. The TIMER1_COMPB ISR is now re-written in assember and performs about four times faster. For simple tasks, the interrupts take only around 1.2us now.

It took a while but it’s finally ready. Click here for the next post:

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