We are gonna have a bad time with E-Waste with all
smartphones going outdated soon.
Most of them have the commonality of having an audio
port. And sometimes a usb port.
So why not repurpose these smartphones as OCR
for barcodes like QR codes.
Just output the code over
a serial port via audio or usb.
for the display, you could display QR codes, if needed as
The cable could be a typical usb that simulates a serial
host, or an audio port that outputs serial signal.
The serial signal can then be read directly for
custom/embedded systems, or can simulate a usb
for easy entry of data for the common user.
Keeping everything as 'serial', also will reduce vectors for
Could allow wifi connection, but might be safer to just
disable it entirely.
Serial :- Old school UART