gloriouscow1d ago

The Pico has no DAC. So you can't play audio - or can you?

Here's a test of how GlyphBlaster will play audio. It's pretty much identical to the way PWM audio is played on the PC - bit-banging the speaker on and off rapidly.

This is the music from Area 5150's credits scene, by cTrix.

#glyphblaster

Show threadgloriouscow1d ago
Turns out there's an even more efficient way to simulate a DAC - set a PWM pin to a high multiple of your sample rate, then use your sample data to modulate the PWM duty cycle. This method was demonstrated by antirez.
Show threadgloriouscow1d ago

cTrix's music isn't really done justice by the shitty PC speaker, so check out a higher quality version here:

https://www.youtube.com/watch?v=olbCqhdVPnA&t=1714s

Demovibes vol. 15 : Tracks, Odds & Miracles (mixtapes from the Demoscene)

YouTube
Show threadgloriouscow
Here's a test meow
May 11 at 10:35pmWeb
Show threadgloriouscow1d ago

The GlyphBlaster will mix its audio with the motherboard's own transparently, using these passthrough headers.

There's a protection diode in case you hook anything up backwards.

Show threadAlice Averlong🏳️‍⚧️1d ago
@gloriouscow sexy