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  1. I went with an ADS1115 breakout board and it...

    I went with an ADS1115 breakout board and it works well; the increased sample rate makes big difference. When powered from the Teensy's 3.3v pin with gain set to 16x (maximum) the input range is from...
  2. Use Teensy 3.6 differential ADC to read analog pressure sensor?

    Hi, I'm currently using a Teensy 3.6 with an external ADC to read an analog pressure sensor. I'm curious if there's any hope of reading the pressure sensor directly using differential ADC on the...
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    As someone designing my first PCB and kind of...

    As someone designing my first PCB and kind of bouncing off all the different free PCB CAD systems for a week or two without finishing anything, I'm curious how you know which part definitions are...
  4. I forgot to mention that the keyswitches will be...

    I forgot to mention that the keyswitches will be on two separate boards that need to be wired to the Teensy which is off-board.

    It looks like Sparkfun's Qwiic and Adafruit's Stemma QT are pretty...
  5. Okay, good to know. I'm hoping I don't need to...

    Okay, good to know. I'm hoping I don't need to worry too much about that since it doesn't seem likely that I need to poll the keyboard more than 100 times a second, probably less. The MCP23017 will...
  6. Yeah, that will do. Thanks!

    Yeah, that will do. Thanks!
  7. Update: I found the writeup I was thinking of....

    Update: I found the writeup I was thinking of. It's at the bottom of the midi page, search for "connecting many buttons". Those are 8-bit. I guess 8-bit multiplexers are much cheaper?
    ...
  8. 16-channel mux or switch register for reading keyswitches

    Hi, I'd like to design a simple circuit board that holds 16 switches and some way to read them, preferably without needing 16 wires to Teensy pins. In previous prototyping I used a keyboard matrix...
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    For this prototype I want to connect line out to...

    For this prototype I want to connect line out to a panel-mount audio jack in a way that I can disconnect the board from the jack without unsoldering it. Sounds like I could just use some regular 0.1"...
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    Parts for audio shield's line out

    I'm wondering where to find ac97 header and cable for the audio shield's line out? Maybe I'm using the wrong search terms but I'm not finding much.
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    I didn't see a question. Did you forget to ask it?

    I didn't see a question. Did you forget to ask it?
  12. On the Teensy audio shield, it says "Caution: do...

    On the Teensy audio shield, it says "Caution: do not short VGND to GND". The headphone jack uses VGND. There is a risk that if you connect the headphone jack to an aux input, that equipment might...
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    Is a heat sink needed or is this an overclocking...

    Is a heat sink needed or is this an overclocking thing?
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    I have no idea if anyone else wants this and I'm...

    I have no idea if anyone else wants this and I'm just getting started with Teensy, but I would be nice to see something designed specifically for easy, portable sound synthesis. So, something like a...
  15. Interesting. The thing is, I expect most people...

    Interesting. The thing is, I expect most people who aren't audio enthusiasts haven't heard of this, and would just plug a headphone jack into a random aux-in without thinking about it? I'm wondering...
  16. Why does the audio shield's headphone jack use a virtual ground?

    This isn't about a problem I'm having, but I'm curious why the line-out on the audio shield uses capacitors and a true ground, but the headphone jack uses no capacitors and a virtual ground? It seems...
  17. I am not sure what you're saying about adding a...

    I am not sure what you're saying about adding a new phone jack. Are you using the audio shield? What do you use for an amp? Are you replacing the existing stereo out connector?
  18. I don't know, but this thread seems to have some...

    I don't know, but this thread seems to have some relevant things to say about capacitive sensors and grounding: https://forum.arduino.cc/index.php?topic=483297.msg3300302#msg3300302

    Also: "The...
  19. Yes, switches seem tricky. I'm thinking of using...

    Yes, switches seem tricky. I'm thinking of using mechanical keyboard switches, but they are too large, since accordion buttons are closer together than keyboard buttons. Perhaps they can be cut down....
  20. Choosing parts for a musical instrument project

    Hi, I'm looking to eventually build a musical instrument (similar to an accordion) using Teensy for sound synthesis and I'm figuring out which parts to use. Mono sound with 4-note polyphony would be...
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