![]() Made a few mods to the MP3 trigger sketch to fit my needs. Spent 10 minutes setting up the shield on a redboard. Update: I just updated both the SD library and the shield library and that appears to have addressed the initialization issues I have been occasionally seeing. Bottom line: if it's gotta work, budget one or two extras to be safe. ![]() ![]() Some of the noise can be addressed by adding extra Vcc bypass caps. Switching to my good amp & speakers, I finally heard that all of the circuits had some degree of digital noise, although it was not noticeable on computer speakers for the most part. It sounded like a 16mm film projector from the '70s. I got one shield that sounded like it had excessive data req noise in the output, which was the first time I became aware that there was any unusual noise at all. I'd also like to add that the audio is fairly noisy-sounds like digital noise bleeding into the analog output-so you will want to keep the fidelity of your playback system fairly low. That first shield has since stopped working altogether, so maybe it was defective, I dunno. I had similar initialization problems as Member 873628 with my first shield (worked with USB, failed 50% of the time under external power) but I suspect that it was just a problem with that particular shield because none of the other 8 required any special delays in order for them to initialize properly. Having purchased and built with 9 of these shields (7 from SparkFun, 2 from Mouser), I can confirm that they're very easy to use and inexpensive for what they do. ![]()
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