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Forum Index : Microcontroller and PC projects : PicoMite - adventures in sound
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| crazycloud Newbie  Joined: 20/08/2023 Location: United StatesPosts: 37 |
I just looked at the schematic again. I do have a GBUFF signal in the audio output. Maybe I blew out the audio output circuit when I connected it to my bluetooth speaker. I have about 4 of these boards. I will try another. thank you for the advice. |
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| crazycloud Newbie Joined: 20/08/2023 Location: United StatesPosts: 37 |
In response to GOC30's comment about my option list for the VS1053 my very first configuration DID HAVE option system spi GP10 Gp11,gp12. It did not produce sound. I didn't think it was necessary because I only had one SPI device namely the VS1053. I think you are saying that because I'm using a webmite I need option system spi GP10,GP11,GP12. What do these 3 pins run? is it the wifi? |
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| PhenixRising Guru  Joined: 07/11/2023 Location: United KingdomPosts: 864 |
Only just picked-up on this thread and have downloaded the data-sheet. Trying to imagine the possibilities here. Let's say a solo musician uses this to play mp3 backing tracks for his guitar/vocal performance. At a certain point, during playback, he needs to trigger a MIDI change (maybe a guitar effect). Can this be programmed and thus eliminate the floor-pedal tap-dancing routine? If so, we are talking about some serious possibilities here. |
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goc30 Guru Joined: 12/04/2017 Location: FrancePosts: 427 |
You have to ask Pete about the way he manages the SPI signals with the VS1053, obviously between the first version and the second, he separated the two SPIs Also pay attention to one detail, at home with the Chinese VS1053 card (the same as Pete's), the sound output is very weak, I have to increase the level of my amp |
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| crazycloud Newbie Joined: 20/08/2023 Location: United StatesPosts: 37 |
thank you everyone. I got it working. the sound quality through crystal type high impedance headphones is awesome! I gave it a 100k mp3 file to play. It doesn't seem to play the entire file, BUT I GET SOUND!!  |
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| crazycloud Newbie Joined: 20/08/2023 Location: United StatesPosts: 37 |
now I have to figure out how to input it into an amplifier without blowing up the circuit. Maybe couple it into 2 high impedance audio transformers? |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9119 |
This thread is out of date - see here for the final version of VS1053 support. If you aren't getting an error when using audio with the vs1053 then pretty much everything is working. It is only XDCS that could be faulty if you don't see an error. Try using a different pin for XDCS or make sure the wiring is OK end-to-end and teat the pin isn't being held by anything else in the circuit |
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| cosmic frog Senior Member  Joined: 09/02/2012 Location: United KingdomPosts: 284 |
Have you tried this -  The Ground should come from the "-" connection of the power supply DO NOT USE GBUF. Dave. |
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| crazycloud Newbie Joined: 20/08/2023 Location: United StatesPosts: 37 |
I just saw that online, thank you. my next project. |
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| crazycloud Newbie Joined: 20/08/2023 Location: United StatesPosts: 37 |
you folks are awesome. |
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| damos Regular Member  Joined: 15/04/2016 Location: AustraliaPosts: 63 |
Has anyone measured the latency on these MP3 players? I tried doing this a while ago and the MP3 player I was using had a 600ms latency, making it completely useless for the task. Ideally you need less than 20ms latency to make it worthwhile and even then a good musician would be complaining when playing in an ensemble. |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 9119 |
mp3 is analysed and buffered frame by frame. The number of millisecond of sound in a frame varies depending on the compression but cannot be less than 25-50 mSec so it is completely inappropriate for this use. MIDI is real- time hence why it is used and not MP3 |
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| damos Regular Member Joined: 15/04/2016 Location: AustraliaPosts: 63 |
It would be ok to use WAV which should have lower latency. A lot of music samples are quite short, so for percussion or non-sustained notes WAV would be fine. The idea was to create a cheap MIDI player that interprets MIDI commands using stored samples. This approach could not be used for sustained notes. I have always found the instruments on most MIDI systems (apart from high-end DAW) to not sound very good. Jeremy's additive synth project (published in Silicon Chip) is now very good. They are good enough for simple systems and non-musical (or toy) applications. |
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