Raspberry PI

Installatie Raspberry Pi

Docker IOTserver 2.0

Docker IOT Server 1.0

CMD info

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Install MQTT on Raspberry pi

Install Docker

Bluetooth

Relay is switching on (re)boot

GPIO 14 is used which is testing the UART on boot so take another GPIO

Communication between 2 raspberry pi’s over serial (UART)

Below a summary of the linked page

  • sudo nano /boot/config.txt > enable_uart=1
  • sudo systemctl disable serial-getty@ttyS0.service
  • sudo nano /boot/cmdline.txt > Remove “console=serial0,115200” (If applicable)
  • sudo reboot
  • sudo apt-get install minicom -y
  • minicom -b 115200 -o -D /dev/ttyS0
    • Ctrl-A E for local echo
    • Ctrl-A A for line feed

Baud rate 250000 (DMX) Didn’t get it working

https://bookspaceworld.com/Article/configuring-uart-rpi-uart-speeds-baud-rate

Raspberry pi 2

  • Disable console > sudo raspi-config
    • interface options > Serial port
    • login shell > no
    • serial port enabled > yes
  • Finish
  • enable and adapt UART settings in /boot/config.txt
    • Check UART > enable_uart=1
    • Add > init_uart_clock=1627604 (init_uart_clock=26041667)
    • init_uart_baud=460800
  • Reboot
  • Check current settings serial port > stty < /dev/ttyAMA0
  • Set baud rate > stty -F /dev/ttyAMA0 speed 38400

RS485 CAN HAT waveshare example

DMX project edel17.pdf

Trouble shooting

  • Measure core speed > vcgencmd measure_clock core
  • Measure UART speed > vcgencmd measure_clock uart
  • sudo nano /boot/config.txt
  • sudo nano /boot/cmdline.txt
  • Current settings serial port > stty -F /dev/ttyS0
  • Set baud rate > stty -F /dev/ttyS0 115200
  • Send to serial port > echo -e “hello world\r\n” > /dev/ttyS0

WiFi to Ethernet bridge

Original website

Write image to PI and connect to WiFi.
To change accesspoint:
sudo raspi-config
or
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf

sudo apt-get update -y && sudo apt-get upgrade -y
sudo apt-get install dnsmasq
  • nano /etc/dhcpcd.conf
    • interface eth0
    • static ip_address=192.168.220.1/24
    • static routers=192.168.220.0
    • static domain_name_servers=8.8.8.8
    • metric 300
    • interface wlan0
    • metric 200
  • sudo service dhcpcd restart

To check service = systemctl status dhcpcd.service

Save dnsmask config = sudo mv /etc/dnsmasq.conf /etc/dnsmasq.conf.orig

Create new dnsmask config = sudo nano /etc/dnsmasq.conf

  • interface=eth0 # Use interface eth0
  • listen-address=192.168.220.1 # Specify the address to listen on
  • bind-interfaces # Bind to the interface The service won’t start with disconnected Eth0
  • domain-needed # Don’t forward short names
  • bogus-priv # Drop the non-routed address spaces.
  • dhcp-range=192.168.220.50,192.168.220.150,12h # IP range and lease time

To check service = systemctl status dnsmasq.service

Enable IPv4 packet forwarding

  • sudo nano /etc/sysctl.conf
  • Uncomment this line or add it to the bottom
  • net.ipv4.ip_forward=1

to activate directly = sudo sh -c “echo 1 > /proc/sys/net/ipv4/ip_forward”

Configure firewall

  • sudo iptables -t nat -A POSTROUTING -o wlan0 -j MASQUERADE
  • sudo iptables -A FORWARD -i wlan0 -o eth0 -m state –state RELATED,ESTABLISHED -j ACCEPT
  • sudo iptables -A FORWARD -i eth0 -o wlan0 -j ACCEPT

Save FW rules = sudo sh -c “iptables-save > /etc/iptables.ipv4.nat”

use FW rules at startup

  • sudo nano /etc/rc.local
    • Before exit0 insert iptables-restore < /etc/iptables.ipv4.nat
    • sudo service dnsmasq start

reboot raspberry PI