Beautiful day for some trial @openacousticdevices.info hydrophone amplifier deployments.

It’s hard to find a nice small monitor these days. This twenty-year-old 17” Apple Studio Display is perfect though for my office Mac Mini server.

We found that SanDisk Ultra 256 GB cards use a lot more energy than most other cards. I'd recommend SanDisk Extreme cards. www.openacousticdevices.info/sd-card-guide

A really nice description (with code examples) of using @openacousticdevices.info AudioMoth and Raspberry Pi together for soundscape monitoring. towardsdatascience.com/audio-spectr...

We have an external microphone and waterproof mount coming out soon which might work well for this application. The electret capsule microphone is a little less noisy than the internal MEMS microphone.

New hydrophone amplifiers for @openacousticdevices.info AudioMoth ready for testing.

This one is 30 seconds of bird song played back at each test location using the standard @openacousticdevices.info AudioMoth firmware with GPS synchronisation. This one has a couple of test points with additional background noise (a real bird).

Yes, once you have a position estimate you can mix the individual recordings together with the correct offset to improve the signal to noise ratio. Lots more uncertainty when the AudioMoths don't surround the sound source.

More @openacousticdevices.info AudioMoth-GPS-Sync experiments to visualise the sound sources within recordings.

Added floppy disk and line printer simulation to the AudioMoth Altair 8800 simulator (along with 64KB of RAM) in order to run Altair Disk Extended BASIC. This was the last version before the switch to CP/M. github.com/AlexRogersCS...

Nostalgia for ASCII Mandelbrot set plots. This is an Altair BASIC 2.0 program from @devilishdesign.bsky.social running on an @openacousticdevices.info AudioMoth emulating an Altair 8800. github.com/AlexRogersCS...

The first commercial release of Altair BASIC (Version 2.0) came out fifty years ago (1st July 1975). Amazingly, a paper tape copy has just resurfaced @devilishdesign.bsky.social. It runs perfectly on my AudioMoth Altair 8800 simulator. github.com/AlexRogersCS...

Great to see @openacousticdevices.info HydroMoth appearing in this video on #conservationtech from @wildlabs.bsky.social and @worldwildlife.org.
www.youtube.com/watch?v=lPtY...

Eventually got my simulated Altair 8800 running with Altair Disk Extended BASIC. A bug in the disk controller prevented it from formatting the floppy disk. Strangely, the same bug is present in the SIMH Altair simulation. Maybe everyone else uses CP/M, or they do not format blank disks.

The Computer History Museum @computerhistory.bsky.social have an original signed copy of the paper tape. www.computerhistory.org/collections/...

Fifty years ago today, Paul Allen and Bill Gates released the first version of their BASIC interpreter for the Altair 8800. The video shows the original binary being emulated on an @openacousticdevices.info AudioMoth with the teleprinter being simulated by USB serial.

Reminds me of this amazing PhD celebration cake @natbzielonka.bsky.social