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Showing posts from June, 2014

How To Send Email With Python (smtplib and MIMEText)

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It is actually pretty easy to  send emails with python. The smtplib module provides the necessary "tools" to send mail to any Internet machine with an SMTP or ESMTP listener daemon.

In this script I am using gmail, but it is not limited to Google as long as your provide the correct smtp server + port.

Python 2.7.3 

fromemail.mime.text import MIMEText  importsmtplibdef sendmail(to,subject,text):  user = 'name@gmail.com'  pwd = 'password'      msg = MIMEText(text)      msg['From'] = 'james@gmail.com'      msg['To'] = to      msg['Subject'] = subject  try:          smtpServer = smtplib.SMTP('smtp.gmail.com', 587)          smtpServer.ehlo()          smtpServer.starttls()          smtpServer.ehlo()          smtpServer.login(user, pwd)          smtpServer.sendmail(user, to, msg.as_string())          smtpServer.close()  print "mail sent."  except SMTPException:  print "failed."  
Let's take it for a te…

Automatically Check The Raspberry Pi's Temperature (+Prevent Overheating)

No need to install anything. Just open a terminal and execute the following command to get the temperature of your RasPi.
/opt/vc/bin/vcgencmd measure_temp Automate the process The below script will automatically reboot your Raspberry Pi should it reach a specified threshold (maxtemp). First of all make sure you can reboot/shutdown your raspi without linux asking you for a password. 
user@user:~$ sudo visudo Add the following to the sudoers file.  user ALL=NOPASSWD: /sbin/shutdown The scriptSave as temp.sh. Maxtemp specifies the temperature cut-off point, at which the Raspi will reboot. 
#!/bin/bash #title :temp.sh #description :Checks Temperature of Raspberry Pi and reboots at maxtemp. #author :Mike M | www.linuxx.eu #notes :Add "user ALL=NOPASSWD: /sbin/shutdown" to sudoers file temp=`/opt/vc/bin/vcgencmd measure_temp | cut -c 6-7` maxtemp=75 if [ $temp -ge $maxtemp ]; then xmessage "Alert! Temp above 75. System reb…

Streaming Video From Your Raspberry Pi Camera Module with VLC

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If you want to build a surveillance cam you might want to have a look at motion, but for simple video streaming I 'd go for vlc.
Enable Camera Module sudo raspi-config
Install VLC Media Player sudo apt-get install vlc Stream (RTSP)  raspivid -o - -t 0 -n -w 800 -h 600 -fps 20 | cvlc -vvv stream:///dev/stdin --sout '#rtp{sdp=rtsp://:8554/}' :demux=h264
- w: width
- h: heigt
- fps: frames per second
Viewing The RTSP StreamYou need a video player capable of RTSP (e.g. VLC). Open a network stream:

rtsp://###.###.###.###:8554/
###.###.###.### is the IP address of your raspberry pi. Also, do not forget the '/'  at the end, otherwise it won't work.
Streaming Over HTTP  raspivid -o - -t 0 -n -w 800 -h 600 -fps 20 | cvlc -vvv stream:///dev/stdin --sout '#standard{access=http,mux=ts,dst=:8554}' :demux=h264


How to Setup Wi-Fi On Your Raspberry Pi via the Command Line

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Configure Your AP Details sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
Make sure the file reads like this

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev update_config=1 network={ ssid="SSID" proto=RSN key_mgmt=WPA-PSK pairwise=CCMP TKIP group=CCMP TKIP psk="yourkey" }
Configuring the interface  sudo nano /etc/network/interfaces
Add the following

allow-hotplug wlan0 iface wlan0 inet manual wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf iface default inet dhcp
sudo ifconfig wlan0 down
sudo ifconfig wlan0 up
Reboot. Done.