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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

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Filed under: Internet of Things (IoT),Linux,Raspberry Pi,Uncategorized — Tags: energenie, GPIO, python, raspberry pi, raspbian, RF Transmitter — GG @ 2:35 pm

March 31, 2016

RPi 5 inch HDMI LCD

Bought a 5″ HDMI LCD screen for my Raspberry Pi, but it wasn’t working until I made some changes at /boot/config.txt file to force 800×480 screen resolution, edit /boot/config.txt and modify these lines:

hdmi_force_hotplug=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 800 480 60 6 0 0 0

Optionally to enable support of MJPEG, VP6, VP8, Ogg Theora & Ogg Vorbis, add these lines:

start_file=start_x.elf
fixup_file=fixup_x.elf

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Filed under: Internet of Things (IoT),Linux,Raspberry Pi — Tags: HDMI, IoT, LCD, raspberry pi, raspbian — GG @ 2:08 pm

February 27, 2016

RPi camera

Enabling camera on your RPi

```
sudo raspi-config
```

Terminal commands

To take a picture
```
raspistill -o filename.jpg
```
To play a recorded h264 video
```
omxplayer filename.h264
```
To record a slow motion video (10 seconds, resolution 640×480 pixels, 90 frames per second)
```
raspivid -w 640 -h 480 -fps 90 -t 10000 -o filename.h264
```

Installing Python API for RPi camera

sudo apt-get install python-picamera python3-picamera python-rpi.gpio

Python code samples

Preview and capture a photo

import time
import picamera
with picamera.PiCamera() as camera:
    camera.start_preview()
    time.sleep(10)
    camera.capture('filename.jpg')
    camera.stop_preview()

Capturing multiple photos

import time
import picamera
with picamera.PiCamera() as camera:
    i = 0
    while True:
        camera.start_preview()
        time.sleep(1)
        camera.capture(str(i)+(".jpg"))
        i += 1
        time.sleep(5)

Capturing photo when push switch pressed
* connect a push switch to GPIO2 & GND
* use current timestamp as filename
* save JPG when push switch pressed

from time import gmtime, strftime, sleep
import picamera
import RPI.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
button=2
GPIO.setup(button,GPIO.IN,pull_up_down=PIO.PUD_UP)
while True:
    with picamera.PiCamera() as camera:
        camera.resolution = 1920,1080
        GPIO.wait_for_edge(button, GPIO.FALLING)
        camera.start_preview()
        sleep(2)
        camera.capture(strftime("%Y%m%d%H%M%S",gmtime())+'.jpg')
        camera.stop_preview()

A photo posted by @le_g_end on Feb 27, 2016 at 11:30am PST

#raspberrypi #camera & #pushswitch

A video posted by @le_g_end on Feb 27, 2016 at 11:39am PST

Recording a 10 seconds video

from time import sleep
import picamera
with picamera.PiCamera() as camera:
    camera.start_recording('filename.h264')
    sleep(10)
    camera.stop_recording()

Video recording and playback

import os
while True:
    os.system("raspivid -w 640 -h 480 -fps 90 -t 10000 -o filename.h264")
    os.system("omxplayer filename.h264")

Reference

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Filed under: Internet of Things (IoT),Linux,Raspberry Pi — Tags: camera, h264, IoT, jpg, Linux, photo, python, raspberry pi, raspbian, video — GG @ 8:05 pm

RPi Chapter 1

Preparation

Download Raspbian and install it on SD card.
Login using default username: pi, and password: raspberry
Run Xserver
```
startx
```

Update and cleanup

sudo apt-get update
sudo apt-get upgrade
sudo apt-get clean

Installing packages
```
sudo apt-get install {package}
```

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Filed under: Internet of Things (IoT),Linux,Operating Systems,Raspberry Pi — Tags: IoT, Linux, raspberry pi, raspbian, startx — GG @ 3:20 pm

April 25, 2015

My first contact with Raspberry Pi

My new toys = berry + bread, lol

Attended Raspberry Pi workshop today, learned Raspbian, Python programming, solderless breadboard, 7 segment numeric LED display…

One step further in exploration, one step closer to invention.

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Filed under: Raspberry Pi — Tags: HDMI, LED, python, raspberry pi, raspbian, solderless breadboard — GG @ 5:03 pm