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Got a Pico and two pots? Now you got a drone synth. In CircuitPython of course
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| # synthio_two_knob_drone_synth.py -- Got a Pico and two pots? Now you got a drone synth | |
| # 5 Jun 2023 - @todbot / Tod Kurt | |
| # video demo: https://www.youtube.com/watch?v=KsSRaKjhmHg | |
| import time, random, board, analogio, audiopwmio, synthio | |
| knob1 = analogio.AnalogIn(board.GP26) | |
| knob2 = analogio.AnalogIn(board.GP27) | |
| audio = audiopwmio.PWMAudioOut(board.GP10) | |
| synth = synthio.Synthesizer(sample_rate=22050) | |
| audio.play(synth) | |
| note1 = synthio.Note(frequency=100) | |
| note2 = synthio.Note(frequency=200) | |
| synth.press((note1,note2)) | |
| while True: | |
| note1.frequency = synthio.midi_to_hz( knob1.value / 512 ) | |
| note2.frequency = synthio.midi_to_hz( knob2.value / 512 ) |
Can you share the design - such as it is :-) - of that low-pass filter? Looks so much simpler than the RP2040 reference design. I can't quite make out the cap and resistor's values in the video.
Sure!, It's 100n & 1k. It's super janky as it doesn't remove the DC offset (but most all line ins have that too so it's usually not a problem)
But also, I'm slowly coalescing all these gists into a single repo, with wiring diagrams: https://github.com/todbot/circuitpython-synthio-tricks/tree/main/examples
Thank you! I kinda remembered seeing that somewhere in your stuff, so my apologies for not remembering where that was. But then I’ve gotten so much good info from your various projects… :-]
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video demo:
synthio_two_voice_drone_synth.mp4