+++
title = "Split keyboard communication"
author = "Yann Herklotz"
tags = []
categories = []
backlinks = ["5a1a"]
forwardlinks = []
zettelid = "5a1b"
+++

For a split keyboard, the two sides need to communicate with each other
as keys can be pressed on either half and are identified by the
micro-controller on each side. One micro-controller acts as a master and
the other is the slave. These are connected by four cables, often in a
TRRS cable, which can then communicate serially between each other.
Power is also communicated through that wire. Then, when a key is
pressed, it is sent to the master controller, which then sends the right
keycodes to the computer.