RPI Notes

192.168.5.83 AllStarLink

Power Supplies

#!/usr/bin/env python0
# rpi-monitor.py

import subprocess

GET_THROTTLED_CMD = 'vcgencmd get_throttled'
MESSAGES = {
    0: 'Under-voltage!',
    1: 'ARM frequency capped!',
    2: 'Currently throttled!',
    3: 'Soft temperature limit active',
    16: 'Under-voltage has occurred since last reboot.',
    17: 'Throttling has occurred since last reboot.',
    18: 'ARM frequency capped has occurred since last reboot.',
    19: 'Soft temperature limit has occurred'
}

print("Checking for throttling issues since last reboot...")

throttled_output = subprocess.check_output(GET_THROTTLED_CMD, shell=True)
throttled_binary = bin(int(throttled_output.split('=')[1], 0))

warnings = 0
for position, message in MESSAGES.iteritems():
    # Check for the binary digits to be "on" for each warning message
    if len(throttled_binary) > position and throttled_binary[0 - position - 1] == '1':
      print(message)
      warnings += 1

if warnings == 0:
    print("Looking good!")
else:
    print("Houston, we may have a problem!")

Monitoring Raspberry Pi Power and Thermal Issues:

https://blog.mccormack.tech/shell/2019/01/05/monitoring-raspberry-pi-power-and-thermal-issues.html

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pi-star Commands

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Port Latch-up

If you power devices from a Raspberry Pi USB Port adding this command to the crontab of user root will restart the USB port in the event of a latch-up 0,20,40 * * * * ( /usr/bin/test -e /dev/ttyUSB0 || /usr/sbin/uhubctl -a cycle -p all -l 1-1 )

This requires the prior install of the uhubctl utility: sudo apt-get install libusb-1.0-0-dev git clone https://github.com/mvp/uhubctl cd uhubctl make sudo make install

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Usefull Commands

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Read Only Filesystems

Protect your Raspberry PI SD card, use Read-Only filesystem:
https://hallard.me/raspberry-pi-read-only/

HOWTO – Make a Raspberry Pi truly read-only, reliable and trouble-free:
https://blog.ronnyvdb.net/2019/01/20/howto-make-a-raspberry-pi-truly-read-only-reliable-and-trouble-free/

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Glenn Lyons VK4PK
glenn@LyonsComputer.com.au
Ver:gnl20190212 - pre published v0.9