phyphox Forums

the headset has resistors in it for sense of what key is pressed. Can this be expanded on? like for-

• resistance measurement (if fully ranged I could almost turn it into a typewriter - which I wouldn't mind)
  
• data transmission (with audio being used for transmit - you can connect an infrared LED for an) infrared transciever, or could bit bang the I2C protocol (record or be master)
  

There has been a post in this forum on how to (mis)use the audio connectors. With more and more smartphones getting rid of it, I am not sure how/if it is still possible over USB or Lightning (I am also a bit worried about my smartphone, so I never tried it myself).

Wouldn‘t microcontroller be a better means for more sophisticated stuff? Data transmission by BLE with pretty good support in phyphox and by our phyphoxBLE library.

Was this it, https://phyphox.org/forums/showthread.php?tid=238
[Xmas tone idea as data output]

hm… i had https://phyphox.org/forums/showthread.php?tid=867 on my mind, however, it appears only sort-of related…