The August ECN-EMB-018 Joint Meeting featured a talks by Tom Kaminski and Dennis Bahr on the use of Raspberry Pi SoCs for Audio and medical instrumentation. Tom discussed the use of the Raspberry Pi 3 in several projects, including an audio player, a sound level meter, and a Sonic Boom monitoring system. Dennis showed his low-power, battery operated Raspberry Pi Zero unit aimed at portable medical instrumentation. The biggest difference between the two units was the programming approach. Tom primarily used the Python programming language on the Raspbian flavor of Linux for his projects, while Dennis used a “bare metal” approach. Dennis dug into the means needed to compile a simple “C” program and load it into the Pi Zero. His project boots very quickly and runs with little power while Tom’s approach requires the OS to boot first. Dennis is now working on figuring out how to use the powerful graphics pipeline in the Pi Zero to do Infinite Impulse Response filtration. A copy of Tom’s presentation is available at this link. You may email Dennis at bahr-at-inexpress.net for more information on the bare metal booting process.
Editorial Note: I was surprised to find out that three members of the IEEE-Madison Executive Committee (Tom Kaminski, Clark Johnson, and Charles Cowie) were all nearby in Western Wyoming for the past Eclipse event on August 21. A fourth member, Dennis Bahr, viewed the event from southern Missouri. Tom used a Raspberry Pi outfitted with a camera to produce a time lapse of the event. You may view the video at this .Google Drive link. He was in Glendo, WY and a picture of his set up for recording the eclipse (along with his daughters and wife) is documented here.