Every project nowadays reaches for nice user interface. The display models from the company Nextion are quite famous due to their price and capabilities. The connection is made by a 3.3 V UART interface, either by a USB-TTL 3.3 V adapter or via the RasPi's onboard UART, if not already used. The software is written in Python can can be found here. https://github.com/rwth-afu/UniPagerNextion
Start-Animation of the Displays:
In general, all display types from nextion are supported, but it is recommended to use as minimum the 3,2 inch version in order to have sufficient space on the display. The type code is NX4024T032 Link to the manufacturer. There is also a version with 4.2 inch available.
Be aware: The updates of Unipager may not always be compatible with the UniPagerNextion software. If something is not working after an update, let us know and write a ticket to
support at hampager.de
or open a ticket directly.
The working principle of this display control is devided in two parts:
Install unipager as described on the Unipager section of this wiki.
sudo apt-get install git
Clone the github repository containing all the software needed into a temporary directory, e.g.
git clone https://github.com/rwth-afu/UniPagerNextion.git
cd into the directory of the install script and run it:
cd UniPagerNextion/src sudo bash ./install.sh
This will install the python script to
/usr/local/bin/unipagernextion.py and install a systemd service file named
/usr/local/lib/systemd/system/unipagernextion.service. It will also register this service.
Now edit the config file in
/etc/unipagernextionconfig.py according to your needs:
sudo nano /etc/unipagernextionconfig.py
# The config is just a python script which will be included # The hostname, default localhost #hostname = "localhost" # The port, default 8055 #port = 8055 # Serial Port to the Nextion Display, default "/dev/ttyUSB0" #serialport = "/dev/ttyUSB0" # Serial Seppd to the Nextion Display, default 115200 #serialspeed = 115200
In the general case, no adaption is needed. As we have learned, not everybody is familiar with the concept of commenting-in und out Read more. So to be extremly clear here:
# Something means that Something is IS NOT active
Something means that Something IS active
Keep in mind to restart the UnipagerNextion service after altering the config file.
There are two ways of connection the Nextion display to the Raspberry Pi.
If you do not use the Raspager or RaspagerC9000, the GPIO is free to use. So you can conntect the four cables from the Nextion directly to the GPIO header.
Pin association to connect the Nextion display directly to the Raspberry Pi on-board UART.
RED 5 V Pin 02 or Pin 04
BLACK GND Pin 06 or any other ground Pin
GREEN Pin 10
YELLOW Pin 08
Remember: In the default raspbian image, on Raspberry Pi 3B and Raspberry Pi 3B+, the internal Bluetooth is connected to the internal UART. So as it is quite likely you won't use the Bluetooth, disable it by adding a line
/boot/config.txt and disable the Bluetooth service with
sudo systemctl disable hciuart
Also free the UART from the kernel messages by removing
/boot/cmdline.txt and enable the UART by adding
Further information is just one google search away: one google search away.
Reboot your Pi after doing these actions.
There is a python script at https://github.com/rwth-afu/UniPagerNextion/tree/master/src. Edit the COM-Port according to your connection and run it with the
.tft file. For firmware update of the display itself a programming with the Windows software from Nextion is recommended.