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by cosax
Sun Jan 17, 2016 3:01 pm
Forum: Troubleshooting
Topic: Raspbian Jessie - Snort 2.9.7.0-3 (repository) won't install
Replies: 10
Views: 4702

Re: Raspbian Jessie - Snort 2.9.7.0-3 (repository) won't ins

Is there an update on this one? I have just tried to install snort on Jessie and got the same problem.
by cosax
Sat Jan 16, 2016 3:27 pm
Forum: Other projects
Topic: Security Onion Sensor for RasPi
Replies: 9
Views: 11921

Re: Security Onion Sensor for RasPi

Any news about this attempt to install security onion on a RasPi?
by cosax
Sat Mar 28, 2015 4:36 pm
Forum: Troubleshooting
Topic: Pi2 and Edimax EW-7811Un Wifi USB adapter
Replies: 1
Views: 487

Pi2 and Edimax EW-7811Un Wifi USB adapter

I have setup my new Pi2 to run with ethernet. Then I connected my edimax wifi dongle (which works well with older pi's) on one of the usb ports. After a couple of minutes, the ethernet interface of the pi2 goes down and the wifi interface also is inaccessible. I read in some forums that this may ind...
by cosax
Mon Feb 23, 2015 3:09 pm
Forum: Automation, sensing and robotics
Topic: Bell sound, slow to respond
Replies: 1
Views: 435

Bell sound, slow to respond

Hello everyone, I have built a "smart bell" for my home, where at the press of the door bell button a sound is played by my pi, out of the audio jack. My program is written in c and the command I use to play the sound is the following: system("/usr/bin/mpg123 /data/makhome/doorbell.mp3 > /dev/null")...
by cosax
Sun May 25, 2014 3:39 pm
Forum: Automation, sensing and robotics
Topic: Touch screen alternative
Replies: 0
Views: 546

Touch screen alternative

Instead of adding a touch screen control panel to my home automation project (which has a web interface), I am thinking of using a cheap android tablet with wifi, possibly remove its internal battery (if it can be done) fix it an a wall and power it directly from a 5v dc source. 1. Do you think this...
by cosax
Tue May 06, 2014 1:18 pm
Forum: Automation, sensing and robotics
Topic: Sense direction of power flow
Replies: 31
Views: 7030

Re: Sense direction of power flow

Thank you all for your input. It sounds doable but complicated ...
by cosax
Thu May 01, 2014 5:02 pm
Forum: Automation, sensing and robotics
Topic: Sense direction of power flow
Replies: 31
Views: 7030

Re: Sense direction of power flow

Measure the current and voltage at the same time! Multiply the two. The result is your power. To get the two values at the same moment in time use two sample-and-hold A to D converters and set them up so the sample-trigger input is the same. I would think that if you can measure .e.g. at 1000 Hz yo...
by cosax
Wed Apr 30, 2014 8:52 am
Forum: Automation, sensing and robotics
Topic: Sense direction of power flow
Replies: 31
Views: 7030

Re: Sense direction of power flow

Yes the 240V AC. As I understand it, the phase difference between the ac voltage and the current determines the direction that the power flows. The following link may be useful http://openenergymonitor.org/emon/build ... troduction.
by cosax
Wed Apr 30, 2014 5:36 am
Forum: Automation, sensing and robotics
Topic: Sense direction of power flow
Replies: 31
Views: 7030

Re: Sense direction of power flow

Thanks for the info. Yes, in fact I wouldn't feel comfortable with the resistor solution.
Since I lack experience with all this power components, any suggestions for hall effect sensors that could do this job will be very much appreciated.
by cosax
Tue Apr 29, 2014 2:22 pm
Forum: Automation, sensing and robotics
Topic: Sense direction of power flow
Replies: 31
Views: 7030

Sense direction of power flow

Hello everyone, I have recently completed a project where i read the blinking LED from my electricity meter using a light depended resistor in order to measure the power flow (eg http://www.raspberrypi.org/forums/viewtopic.php?f=37&t=21793 ). I also have photovoltaic panels installed at my house and...
by cosax
Wed Nov 06, 2013 6:58 am
Forum: Automation, sensing and robotics
Topic: Desktop PC Power Control
Replies: 23
Views: 11883

Re: Desktop PC Power Control

Just a simple short question to anita2r: "The reset switch is connected across the emitter and collector pins of the transistor. Measure the voltage on the two wires from the reset switch - one is high (3.3v or 5v) and the other is ground (0v). The ' high' wire is connected to the emitter and the gr...
by cosax
Sat May 11, 2013 1:17 pm
Forum: Automation, sensing and robotics
Topic: Extend current security alarm system
Replies: 3
Views: 1883

Re: Extend current security alarm system

Thanks for you answer. Sounds like you have built a very good system. I have checked my existing security system and there are no EOL resistors installed for the PIRs. Also the open contact voltage is 5V. So, if I were to pursue my original idea, can I connect each PIR to the existing and to the RPi...
by cosax
Thu May 09, 2013 4:56 am
Forum: Automation, sensing and robotics
Topic: Extend current security alarm system
Replies: 3
Views: 1883

Extend current security alarm system

Hello everybody, I have just started experimenting with the pi and I have a question (which may sound silly...). I have a simple security alarm system at home and I would like to extend its functionality by connecting "in parallel" the raspberry pi, possibly together with piface. So, I would like ea...

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