New Axoloti prototype
Done! Rerouted the two mic lines to the codec. Now the GPIOs PB3 and PB4 are all clean and not double-assigned anymore. Should have read the ADAU1961 datasheet more thoroughly!
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i think having the pdm instead of the input by choice would still be great. a mic on board is great for prototyping new ideas and can be of use for interactive installations as well
View ArticleNew Axoloti prototype
Meanwhile I have sound from the PDM microphone (looks like I forgot to mention the current version of the board has one) but get a LOT of hiss and very quiet. Unusable really. There would be more...
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New Axoloti prototype
reaganry: nektar expression pedal That's a really good tip. Very inexpensive. I've found some cheap expression pedals frustrating, but I also have some expensive ones (Yamaha) that are a real pita....
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New Axoloti prototype
Cool. If you insist I think it's always tricky to get a hat right the first time and 'generic' is really difficult. I've always wanted to build something modular where you can swap parts out, but...
View ArticleAxoloti PDM microphone
You're right, looks like this was not mentioned in the other thread. Yes it does have a PDM mic on board, normalled to SPI3 via PB3 and PB4 but a jumper can be cut to disconnect the mic from power...
View ArticleAxoloti PDM microphone
The Noloti has a PDM microphone? Was this mentioned anywhere else?
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Axoloti PDM microphone
ricard: when you sum up 32 bits to a single temp_sum - it's basically a 32 tap CIC filter, which has a sinc frequency response Would there be any merit in using a lookup table (that looks like a...
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Axoloti PDM microphone
Thanks Ricard. ricard: So your += vol_step should have an else, doing -= vol_step when the bit is zero. I was assuming that, in theory, if the bitstream has a lot of zeroes it would mean the audio...
View ArticleAxoloti PDM microphone
I think your basic principle is ok, but I'm not good enough at signal processing to say what's going wrong. Basically PDM can be viewed as a one-bit bitstream that needs to be downsampled. So in...
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New Axoloti prototype
Oh that reminds me, this Gill Stalks thing works. Though I feel I did not have to make it this small. Maybe move the jacks to the back, give it a 9V power input, and a stompbox foot switch ......
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Axoloti PDM microphone
I have made a first attempt to include the PDM microphone on the Noloti into the firmware. In short, we are receiving the microphone's bitstream at 3.072 MHz from I2S3 (which is basically SPI3) via...
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New Axoloti prototype
exciting! this thread confirms my strategy of dusting off my old music tech box fyi, nektar expression pedals are great for $20 & work w my EHX and Boss pedals.
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New Axoloti prototype
yippeee! So, I have two prototypes running now, after a bit of struggling with the correct order of flashing. So far, just great! 20230518_150105.jpg2443x3258 1.75 MB
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New Axoloti prototype
Some devices require CV where the control voltages are generated by the pedal. That's a way to generate income I just too a look and some cheap devices (< 50) have polarity...
View ArticleNew Axoloti prototype
Cool, EHX seems like a good starting point. With the polarity and direction switches most instruments should be covered. Now that I think about it I once was looking for an expression pedal compatible...
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New Axoloti prototype
And here's a picture. one input is for a momentary switch and the three wire is the expression pedal. axo-joy.jpg3176x4560 2.03 MB CW —— SleeveWiper — TipCCW —– Ring I believe. Edit. Nope. Just...
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Generally they behave just like a pot and can be wired as such. I have one axoloti with an axocontrol board where I used the two axis joystick points. Since I have the same pedal twice, I can't say...
View ArticleNew Axoloti prototype
unfortunately not really. you are right that these are normally just potentiometers. and the most common is a stereo jack connection, but the wiring is not really standard, the more expensive pedals...
View ArticleNew Axoloti prototype
Good point! I am not familiar with exp pedals, looks like they are just a potentiometer? I also see different wirings and pinouts, is there a most common wiring?
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