On 11/02/2017 10:45, Andrew Gabriel wrote:
> I use the serial port for this.
> You can get a USB-serial adapter which works with the Pi's 3.3V
> serial port directly from Adafruit, and it's very cheap. Use it
> with a laptop/netbook/whatever with a serial port. Can probably
> even use a smartphone with a terminal app.

A laptop/netbook/whatever with a *USB* port: the adapter cable with
embedded convertor chip is from GPIO pins on the RPi side to USB plug on
the other. So you also need appropriate drivers for this particular
serial-USB chip (there are 2 older and 1 current version from Adafruit).
And beforehand you need to enable the UART serial function of those GPIO
pins, which on the RPi3 requires you to disable bluetooth, I think.

Or if you *do* want to use a serial port on the second device, I guess
you need another adapter RS232->USB. I think with phones you may end up
in adapter hell: microUSB->RS232->USBfemaleUSBmale<-GPIOserial.

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