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April 11, 2016

RPi RF Transmitter & Radio Controlled Sockets

Playing with my new toy – Pi-mote Control starter kit with 2 sockets.

Sample code – turn on all plugs for 5 seconds.

import RPi.GPIO as GPIO
from time import sleep
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)

GPIO.setup(17,GPIO.OUT)
GPIO.setup(22,GPIO.OUT)
GPIO.setup(23,GPIO.OUT)
GPIO.setup(27,GPIO.OUT)
GPIO.setup(24,GPIO.OUT)
GPIO.setup(25,GPIO.OUT)

GPIO.output(17,True)
GPIO.output(22,True)
GPIO.output(23,False)
GPIO.output(27,True)
sleep(0.1)
GPIO.output(25,True)
sleep(0.25)
GPIO.output(25,False)

sleep(5)

GPIO.output(17,True)
GPIO.output(22,True)
GPIO.output(23,False)
GPIO.output(27,False)
sleep(0.1)
GPIO.output(25,True)
sleep(0.25)
GPIO.output(25,False)

Complicated? There is an easier way, by using Energenie library.

Installing Energenie library

For Python 3

sudo apt-get install python3-pip
sudo pip-3.2 install energenie

For Python 2

sudo apt-get install python-pip
sudo pip install energenie

* pip is a package management system used to install and manage software packages written in Python.

Sample code – turn on all plugs for 5 seconds

from energenie import switch_on, switch_off
from time import sleep
switch_on()
sleep(5)
switch_off()

It is much easier now, doesn’t it?

Updated: 11/9/2016
To control each switch separately, hold down the green button on one switch for 10-15 seconds, send channel 1 on command, hold down the green button on the other switch for 10-15 seconds, send channel 2 on command.
Now I can switch on/off the plug separately.

from energenie import switch_on, switch_off
from time import sleep
switch_on(1)
sleep(3);
switch_off(1)
sleep(3);
switch_on(2)
sleep(3);
switch_off(2)

Now I’ll be able to automatically turn on my radio every morning to wake me up, or remotely turn on my rice cooker before I arrive at home 😉

Reference
Controlling electrical sockets with Energenie Pi-mote – Raspberry Pi
Energenie Documentation
Energenie Python library source code

April 23, 2015

Grayscaling your website

A quick solution to convert webpages into black and white using CSS grayscale filter, supported by all major web browsers including MSIE, Firefox, Chrome, Safari. Suitable for making mourning page, paying tribute, & etc.

Demo

Convert the entire page into black & white:

body {
  filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");
  filter: gray;
  -webkit-filter: grayscale(1);
}

Convert selected elements into black & white:

.grayscale {
  filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");
  filter: gray;
  -webkit-filter: grayscale(1);
}

And add grayscale class to selected HTML elements. E.g.:

<div class="grayscale">
 ...
<div>

Print webpages in black & white:

@media print {
  .grayscale {
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale");
    filter: gray;
    -webkit-filter: grayscale(1);
  }
}

CDN options
CSS also available on CDN.

Grayscale all:

<link rel="stylesheet" type="text/css" href="http://cdn.ggshow.com/styles/grayscale-all.css">

Grayscale selected:

<link rel="stylesheet" type="text/css" href="http://cdn.ggshow.com/styles/grayscale.css">

Grayscale print:

<link rel="stylesheet" type="text/css" href="http://cdn.ggshow.com/styles/grayscale-print.css">

Or using CSS import method:

Grayscale all:

@import url("http://cdn.ggshow.com/styles/grayscale-all.css");

Grayscale selected:

@import url("http://cdn.ggshow.com/styles/grayscale.css");

Grayscale print:

@import url("http://cdn.ggshow.com/styles/grayscale-print.css");
Filed under: CSS,HTML,Uncategorized — Tags: , , , , — GG @ 6:59 pm

January 20, 2013

Netbeans will not start? Perhaps it does!

Unable to start Netbeans in Ubuntu, reinstalling it doesn’t help, installing a different version doesn’t help, tried to install from Software Centre, install from terminal apt-get command, install using the offline .sh installer, install different bundle… no luck.

From System Monitor Processes tab, it appears that the Netbeans is running, and the task appear at launcher, but I just can’t find the program on any workspace. Until I found the little 3px line on one of my workspace, on one of the display.

The program window was just too small to be found. No minimum window size? Who know?
Move the cursor onto it, click & drag to resize it, and now I’ve got my Netbeans back.

The program window move the cursor onto it click & drag to resize it Netbeans window

It may happens to any other software that doesn’t have a minimum windows size, or on other operating system. If you have a same problem, don’t reformat your pc 🙂

Filed under: Uncategorized — Tags: , , , — GG @ 8:51 pm

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