= Universal asynchronous receiver-transmitter
{c}
{wiki}
= UART
{c}
{synonym}
{title2}
A good project to see UARTs at work in all their beauty is to connect two <Raspberry Pis> via UART, and then:
* type in one and see characters appear in the other: https://scribles.net/setting-up-uart-serial-communication-between-raspberry-pis/
* send data via a script: https://raspberrypi.stackexchange.com/questions/29027/how-should-i-properly-communicate-2-raspberry-pi-via-uart
Part of the beauty of this is that you can just connect both boards directly manually with a few wire-to-wire connections with simple <jump wire>. Its simplicity is just quite refreshing. Sure, you could do something like that for any physical layer link presumably...
Remember that you can only have one <GNU screen> connected at a time or else they will mess each other up: https://unix.stackexchange.com/questions/93892/why-is-screen-is-terminating-without-root/367549\#367549
On <Ubuntu 22.04> you can screen without <sudo> by adding yourself to the `dialout` group with:
``
sudo usermod -a -G dialout $USER
``