pi tips

Discover devices on local network

• ifconfig | grep broadcast
• arp -a

Connect to pi via ssh on localhost

ssh [email protected]

Enable VNC connection

sudo raspi-config

• Under the Interface menu

Shutdown the pi

sudo shutdown now

Use pi aliases

Symlink the .bash_aliases file to your home folder, like wise:

• cd ~ && sudo ln -s /home/pi/dev/.bash_aliases .bash_aliases And then invoke the functions from .bashrc or other profile file.
• pi_welcome
• pi_cmds

Auto-Hotspot

https://github.com/RaspberryConnect/AutoHotspot-Installer

Services

Using influx to store raspberry pi basic metrics. Those metrics get into the DB by the 'tools/system_monitoring_to_influx.py' service.

Commands

• START
  • systemctl start system-monitoring.service
  • systemctl start external-temperature-monitoring.service
• STOP
  • systemctl stop system-monitoring.service
  • systemctl stop external-temperature-monitoring.service
• Status
  • systemctl status system-monitoring.service
  • systemctl status external-temperature-monitoring.service
• Log
  • journalctl -u system-monitoring.service
  • journalctl -u external-temperature-monitoring.service

Install services

Create a symlink in /etc/systemd/system that points to the dev folder's service files. Like so:

• cd /etc/systemd/system && sudo ln -s /home/pi/dev/tools/external-temperature-monitoring.service external-temperature-monitoring.service
• You should see: system-monitoring.service -> /home/pi/dev/tools/system-monitoring.service Install dependencies:
• pip install influxdb
• pip install psutil
• Install https://github.com/simonmonk/pi_analog
  • $ git clone https://github.com/simonmonk/pi_analog.git
  • cd pi_analog
  • sudo python3 setup.py install And then start it
• systemctl start system-monitoring.service Eventually, enable it so it will be started after system has booted
• systemctl enable system-monitoring.service

Documentation

Thermometer

Using analoge termometer which means we need specific wiring: https://magpi.raspberrypi.org/articles/how-to-use-raspberry-pi-temperature-and-light-sensors

Which needs a python lib: https://github.com/simonmonk/pi_analog

To change I2C on raspberry to use adafruit like hat pin numbers for stepper motor

sudo raspi-config