Raspberry pi Tips and Tricks
04 Jun 2019If you ever worked with raspberry pi, you know how many times you need google around to find a particular sulution. From enabling ssh first time to enabling uart speed, you need to google around and find the soulution that really works. This is a list of frequent things you may need to configure in raspberry pi. This assumes you are running Raspbian Stretch with desktop.
Enable ssh
create an empty file in
/boot/ssh
Connect to WiFi on boot
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=GB
network={
ssid="insert_your_hidden_SSID_here"
scan_ssid=1
psk="insert_your_wifi_password_here"
key_mgmt=WPA-PSK
}
Disable rainbow screen
sudo nano /boot/config.txt
disable_splash=1
Disable boot logs
sudo nano /boot/cmdline.txt
Change the console from tty1 to
console=tty3
Add this to the end of the line. 'loglevel=0'
removes most of the messages from the boot. You can also use 'loglevel=3'
, but some boot messages may re-appear.
quiet splash loglevel=0 logo.nologo vt.global_cursor_default=0
If you are going to use Plymouth add this:
plymouth.ignore-serial-consoles
Change boot animation
Change raspbian plymouth theme
cd /usr/share/plymouth/themes/
Clone this repository.
sudo git clone https://github.com/krishnan793/PlymouthTheme-TheRun.git
Install the theme.
sudo update-alternatives --install /usr/share/plymouth/themes/default.plymouth default.plymouth /usr/share/plymouth/themes/PlymouthTheme-TheRun/PlymouthTheme-TheRun.plymouth 100
Select the default theme.
sudo update-alternatives --config default.plymouth
Update the initramfs image.
sudo update-initramfs -u
sudo nano /etc/plymouth/plymouthd.conf
Theme=pix to
Theme=PlymouthTheme-TheRun
Waveshare 7 inch display
sudo nano /boot/config.txt
hdmi_force_hotplug=1
config_hdmi_boost=0
overscan_left=0
overscan_right=0
overscan_top=0
overscan_bottom=0
disable_overscan=0
hdmi_cvt=1024 600 60 6 ##
framebuffer_width=1024 ##
framebuffer_height=600 ##
hdmi_group=2
hdmi_mode=1
hdmi_mode=87
Rotate display
sudo nano /boot/config.txt
lcd_rotate=2
or
display_rotate=0
- display_rotate=0 Normal
- display_rotate=1 90 degrees
- display_rotate=2 180 degrees
Set display brightness
sudo echo 50 > /sys/class/backlight/rpi_backlight/brightness
To make it persistent add the above statement in /etc/rc.local
(before exit 0)
Switch off display
sudo echo 1 > /sys/class/backlight/rpi_backlight/b1_power
Switch on display
sudo echo 0 > /sys/class/backlight/rpi_backlight/b1_power
To remove low power indication (lightning icon)
sudo nano /boot/config.txt
avoid_warnings=1
Hide cursor
sudo nano /etc/lightdm/lightdm.conf
[Seat:*]
xserver-command=X -nocursor
Start app in fullscreen with desktop on boot
Make sure you enable auto login using sudo raspi-config
sudo nano /etc/xdg/autostart/smart_room.desktop
[Desktop Entry]
Type=Application
Name=smart_room
Comment=Kivy RPI Infoscreen
NoDisplay=false
Exec=chromium-browser http://192.168.1.5/src/home.html --start-fullscreen
NotShowIn=GNOME;KDE;XFCE;
Start app in fullscreen without desktop on boot
Make sure you enable auto login using sudo raspi-config
sudo nano /etc/lightdm/lightdm.conf
[Seat:*]
user-session=myxclient
sudo nano /usr/share/xsessions/myxclient.desktop
[Desktop Entry]
Type=Application
Name=smart_room
Comment=Kivy RPI Infoscreen
NoDisplay=false
Exec=/home/pi/start.sh
NotShowIn=GNOME;KDE;XFCE;
sudo nano /home/pi/start.sh
#!/bin/bash
/usr/bin/chromium-browser --kiosk --app=https://www.google.com --start-fullscreen --window-size=1024,600 --window-position=0,0
UART
The SoCs used on the Raspberry Pis have two built-in UARTs, a PL011 and a mini UART. both are 3.3V devices. By default, on Raspberry Pis equipped with the wireless/Bluetooth module (Raspberry Pi 3 and Raspberry Pi Zero W), the PL011 UART is connected to the Bluetooth module, while the mini UART is used as the primary UART and will have a Linux console on it. On all other models, the PL011 is used as the primary UART.
For pi3 & zero
- /dev/ttyS0 (mini UART) primary UART symlink to /dev/serial0
- /dev/ttyAMA0 (PL011) bluetooth module symlink to /dev/serial1
The baud rate of the mini UART is linked to the core frequency of the VPU (VideoCore processor) on the VC4 GPU.
Steps to enable mini UART
- add
enable_uart=1
in/boot/config.txt
- remove
console=serial0
from/boot/cmdline.txt
default baud rate is: 115200