Some older android phones used the audio jack double duty as a serial debug console, the nexus 5 for example.
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You can turn literally any signal into another it's great.
Fun fact: usb uart to audio jack is actually a thing: https://ae01.alicdn.com/kf/HTB1G43QaOnrK1RjSsziq6xptpXaN/win8-10-android-mac-pl2303hxd-usb-uart-ttl-to-2-5mm-audio-jack-serial-adatper-cable.jpg
Some older android phones used the audio jack double duty as a serial debug console, the nexus 5 for example.
did you know you can use markdown to embed that picture in your comment:
if you do:
syntax of message above:
You can turn literally any signal into another it's great.
Yes, it's awesome!