hobopanda

#!/usr/bin/env python
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
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#   http://www.apache.org/licenses/LICENSE-2.0

hobopanda

USE AT YOUR OWN RISK!!

Run this in a terminal to determine current MHz: 
   
   sudo cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq


benchmarking

install sysbench: sudo apt-get install sysbench

hobopanda

Docker - How to cleanup (unused) resources

Once in a while, you may need to cleanup resources (containers, volumes, images, networks) ...

delete volumes

// see: https://github.com/chadoe/docker-cleanup-volumes

$ docker volume rm $(docker volume ls -qf dangling=true)

$ docker volume ls -qf dangling=true | xargs -r docker volume rm

hobopanda

Raspberry Pi Zero OTG Mode

Simple guide for setting up OTG modes on the Raspberry Pi Zero - By Andrew Mulholland (gbaman).

The Raspberry Pi Zero (and model A and A+) support USB On The Go, given the processor is connected directly to the USB port, unlike on the B, B+ or Pi 2 B, which goes via a USB hub.
Because of this, if setup to, the Pi can act as a USB slave instead, providing virtual serial (a terminal), virtual ethernet, virtual mass storage device (pendrive) or even other virtual devices like HID, MIDI, or act as a virtual webcam!
It is important to note that, although the model A and A+ can support being a USB slave, they are missing the ID pin (is tied to ground internally) so are unable to dynamically switch between USB master/slave mode. As such, they default to USB master mode. There is no easy way to change this right now.
It is also important to note, that a USB to UART serial adapter is not needed for any of these guides, as may be documented elsewhere across the int

hobopanda

#!/usr/bin/env bash

rrdtool create temperatures.rrd \
--start N \
--step 300 \
 DS:temps1:GAUGE:1200:-40:50 \
 DS:temps2:GAUGE:1200:-40:50 \
 DS:temps3:GAUGE:1200:-40:50 \
 DS:temps4:GAUGE:1200:-40:50 \
 DS:temps5:GAUGE:1200:-40:50 \

hobopanda

#!/usr/bin/env bash
# Receive weather data from remote USB WDE1 and store it into database

# Loop forever to read data from USB WDE1
socat / dev/ttyUSB0, B9600 STDOUT | \
while read line
do
   if [["$ {line%% *}" == '$ 1']] then
       # Format data
       "{? line # 1, 1,} $" tmp = `echo | tr ',' ','`.

hobopanda

#!/usr/bin/env bash

rrdtool xport -s now-3h -e now --step 300 \
DEF:a=/home/pi/weather/temperatures.rrd:temps1:AVERAGE \
DEF:b=/home/pi/weather/temperatures.rrd:temps2:AVERAGE \
DEF:c=/home/pi/weather/temperatures.rrd:temps3:AVERAGE \
DEF:d=/home/pi/weather/temperatures.rrd:temps4:AVERAGE \
DEF:e=/home/pi/weather/temperatures.rrd:temps5:AVERAGE \
DEF:f=/home/pi/weather/temperatures.rrd:temps6:AVERAGE \
XPORT:a:"Livingroom" \

hobopanda

$.ajax({
    type: "GET",
    url: "data/temperature24h.xml",
    dataType: "xml",
    success: function(xml) {
        var series = []

        //define series
        $(xml).find("entry").each(function() {
            var seriesOptions = {

hobopanda

$.ajax({
    type: "GET",
    url: "data/temperature24h.xml",
    dataType: "xml",
    success: function(xml) {
        var series = []

        //define series
        $(xml).find("entry").each(function() {
            var seriesOptions = {