Raspberry Pi Zero pHat for KNX/EIB, the standardized protocol for smart home automation.
It allows your Raspberry Pi to connect to your home and operate it with your favourite KNX ready home automation software (Home Assistant, Jeedom, OpenHAB...) and makes an incredibly low cost Supervisor.
It can also act as a very cost effective KNX IP Gateway or Router with knxd and can be used to program your participants with ETS.

Features:

• Isolated KNX/EIB TP-UART interface (NCN5121)
• 12-24V up to 2A DC-DC step-down power suppy input

Installation:

KNX Zero provides 2 external connectors:
- DC 12-24V up to 2A Input for powering the raspberry Pi
- KNX/EIB Twisted Pair Bus connector

Usage:

For Raspberry Pi 3+/Zero W users: disable bluetooth (shared serial line):

echo "enable_uart=1" | sudo tee -a /boot/config.txt
echo "dtoverlay=pi3-disable-bt" | sudo tee -a /boot/config.txt

Remove console=serial0,115200 console=tty1 in /boot/cmdline.txt

- KNX:

For maximum compatibility, the NCN5121 serial line is set to 19200bps and 8E1.
More details on knxd setup can be found on knxd project page.

For Raspberry Pi users: enable hardware serial:

sudo sed -ibak "s/console=serial0,115200//g" /boot/cmdline.txt
sudo systemctl disable hciuart # Disable Software uart
sudo systemctl stop serial-getty@ttyAMA0.service
sudo systemctl disable serial-getty@ttyAMA0.service

Install knxd:

sudo apt install knxd

Testing example:

knxd --eibaddr=1.1.63 --client-addrs=1.1.64:5 -D -T -S -b tpuarts:/dev/ttyAMA0
(/dev/ttyAMA0 may change depending of your device)
For knxd service to load at startup:
- Edit /etc/knxd.conf file
- Change KNXD_OPTS line
- Run sudo systemctl start knxd