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by stijn.ghesquiere
Mon Nov 13, 2017 6:11 pm
Forum: Python
Topic: Recommendations for best way to graph my data
Replies: 3
Views: 802

Re: Recommendations for best way to graph my data

Or you transport the data to a system as Emoncms (https://emoncms.org/, open source). They have a raspberry pi version (disk image). In Emoncms you can watch the data in all kinds of graphs, also real-time in a web interface. It's very efficient in logging data. (I use it to log and watch activity o...
by stijn.ghesquiere
Wed Nov 01, 2017 9:20 pm
Forum: Python
Topic: Ultrasonic Sensor Readings in Different Thread
Replies: 5
Views: 1331

Re: Ultrasonic Sensor Readings in Different Thread

@OutoftheBOTS: Don't worry, I'm not arguing that your solution isn't good. It's elegant. I just wanted to point out that if threads interfere in each others timings, multiprocessing is an alternative. And if you use a shared value in python multiprocessing the correct way, operations on that value a...
by stijn.ghesquiere
Wed Nov 01, 2017 9:24 am
Forum: Python
Topic: Ultrasonic Sensor Readings in Different Thread
Replies: 5
Views: 1331

Re: Ultrasonic Sensor Readings in Different Thread

Are you using the threading module or the multiprocessing module? It can make a big difference depending on your python code. It is to say: if your code is pure python, the GIL is not released (https://wiki.python.org/moin/GlobalInterpreterLock). In practice, this means that python shares cpu time b...
by stijn.ghesquiere
Mon Oct 16, 2017 5:05 pm
Forum: General discussion
Topic: KRACK Key Reinstallation Attacks raspbian patch?
Replies: 26
Views: 7234

KRACK Key Reinstallation Attacks raspbian patch?

Is Raspbian already patchable for this serious WIFI attack?

https://www.krackattacks.com/
by stijn.ghesquiere
Sat Mar 25, 2017 1:13 pm
Forum: General discussion
Topic: Pi Foundation is overcharging for MPEG2 Licenses
Replies: 18
Views: 5911

Re: Pi Foundation is overcharging for MPEG2 Licenses

I tend to agree with Richard. I don't mind to pay 2.40, but it would be good if the foundation clarified that it's more or less an extra income and only a part of it is real licence costs. The cost of the licence isn't just the cost of MPEGLA bit, but also the cost of databasing and distribution. Th...
by stijn.ghesquiere
Wed Feb 01, 2017 10:38 am
Forum: General discussion
Topic: About this (weird) humidity graph
Replies: 9
Views: 1876

Re: About this (weird) humidity graph

How far from the AC unit do you take readings? If you happen to have a system so measure electricity use (example open source project https://shop.openenergymonitor.com/), you could monitor it. My air conditioning system is as simple as yours. No eco mode etc. It's electricity use looks like this: a...
by stijn.ghesquiere
Tue Jan 31, 2017 1:40 pm
Forum: General discussion
Topic: About this (weird) humidity graph
Replies: 9
Views: 1876

Re: About this (weird) humidity graph

Looking at you graphs, I would say that the airconditioner in the 'abnormal' goes on/off during the night. Once it's on, the temperature decreases, and so does the humidity. This is completely in line with what airconditioners do. They lower the temperature and water condensates on the cooler, which...
by stijn.ghesquiere
Thu Apr 28, 2016 8:55 am
Forum: General discussion
Topic: is raspberrypi compatible with BD-930?
Replies: 1
Views: 318

Re: is raspberrypi compatible with BD-930?

Assuming that you're fairly new with the raspberry pi and connecting it to peripherals, I'll elaborate a bit more broadly. A quick glance at the data sheet tells me that the BD-930 has support for RS232, USB and ethernet with several network protocols. So basically yes, it's compatible. It's up to y...
by stijn.ghesquiere
Wed Mar 11, 2015 9:57 am
Forum: Advanced users
Topic: USB Weight scale for Raspberry Pi
Replies: 2
Views: 2523

Re: USB Weight scale for Raspberry Pi

Suggestion: Search ebay for: ULTRASHIP U2 USB And here how to use that one onder linux (But not all the scales use the same communication protocol). http://coleretailtech.blogspot.nl/2014/02/linux-wedge-driver-for-ultraship-u2-usb-scales.html. here some more clues on how to connect: http://sourcefor...
by stijn.ghesquiere
Fri Feb 20, 2015 10:46 am
Forum: Networking and servers
Topic: Incoming SSH through VPN
Replies: 4
Views: 1995

Re: Incoming SSH through VPN

Btw is it a lot of data you want to transport?
Depending on that, you could also get a unmanaged vps (virtual private server) webhost that allows you to manage it like any other web-connected linux computer, including ssh and openpvn. You can get those relatively cheap (from 3 dollar/month and up).
by stijn.ghesquiere
Fri Feb 20, 2015 10:38 am
Forum: Networking and servers
Topic: Incoming SSH through VPN
Replies: 4
Views: 1995

Re: Incoming SSH through VPN

If you have a raspberry at home and a public ip address with dynamic dns, you can connect the raspberry at your university via ssh doing a reverse tunnel. Or you can install openvpn in your raspberry at home running on a well known port (443) that would be probably open in the university. Hope it h...
by stijn.ghesquiere
Fri Feb 20, 2015 9:37 am
Forum: General discussion
Topic: How to enable hardware encoding of H264
Replies: 6
Views: 39718

Re: How to enable hardware encoding of H264

Here is a topic about using the GPU to make H264 movies from timelapse series:
http://www.raspberrypi.org/forums/viewtopic.php?t=72435
by stijn.ghesquiere
Fri Jul 19, 2013 12:22 pm
Forum: Automation, sensing and robotics
Topic: Chicken Egg Detector
Replies: 26
Views: 6539

Re: Chicken Egg Detector

Because of the possible variations like chicken waste, eggs to detector distance and such, I'm going for multiple sensors (aka simple touch screen/array). With for example, a 5x5 array, I have 25 sensor position. I suppose with some tweaking, I should be able to detect eggs. Perhaps even multiple eg...
by stijn.ghesquiere
Fri Jul 19, 2013 11:14 am
Forum: Automation, sensing and robotics
Topic: Chicken Egg Detector
Replies: 26
Views: 6539

Re: Chicken Egg Detector

I've been thinking about making a eggs sensor myself. I will use a capacity sensor that made to detect soil humidity. Basically it consists of two small metal plates side to side (laying flat on surface) without making contact. You charge one with 5v or 3.3, whatever, the other is ground. Next you d...
by stijn.ghesquiere
Fri May 03, 2013 7:28 pm
Forum: General discussion
Topic: Timers on RPi??????
Replies: 14
Views: 1518

Re: Timers on RPi??????

Could you elaborate a bit more on what kind of applications you have in mind?
What programming language you would like to use, what hardware is involved etc.
Perhaps we can help you then with practical suggestions and advice.
by stijn.ghesquiere
Sat Apr 27, 2013 2:40 pm
Forum: General discussion
Topic: Windows to pi
Replies: 8
Views: 1438

Re: Windows to pi

Synaptic only runs when there is a graphic interface running. So you need to connect a keyboard, mouse and screen to the pi en start into the graphic mode. If it doesn't automatically, type 'startx'. There are other option that allow you to connect to the pi graphic mode: a vnc-server and client, or...
by stijn.ghesquiere
Wed Apr 17, 2013 8:50 pm
Forum: Automation, sensing and robotics
Topic: Egg bot
Replies: 6
Views: 1382

Re: Egg bot

A servo motor to lift/lower the pen?
The Servoblaster module for the pi makes it easy to control servo's.
by stijn.ghesquiere
Wed Apr 17, 2013 2:11 pm
Forum: Automation, sensing and robotics
Topic: RPi poweroff issues
Replies: 3
Views: 1640

Re: RPi poweroff issues

Have you considered a super capacitor set? For example if you need 1 ampere at 5V and use two 2.7v 10F caps serially, it gives you 1 seconds before the voltage drops below 4.8volt. With a higher capacity, it will get you longer times (e.g. 100F will give you 10 seconds). Mind you that these capacito...
by stijn.ghesquiere
Wed Apr 17, 2013 1:51 pm
Forum: Automation, sensing and robotics
Topic: Raspberry Pi as a QR Scanner?
Replies: 6
Views: 9359

Re: Raspberry Pi as a QR Scanner?

As rpdom mentioned: zbar-tools. You can use it in python easily and sending an email with the result is easy. So with: An raspberry board, a webcam that works on it (you need one anyway, no matter what road you follow), and Python + zbar + email module it should get you what you are looking for. The...
by stijn.ghesquiere
Wed Apr 17, 2013 1:43 pm
Forum: Troubleshooting
Topic: USB Serial Problem
Replies: 5
Views: 1170

Re: USB Serial Problem

Have you tried adding:
dwc_otg.speed=1
to /boot/cmdline.txt?

It set the USB to slower speed and for me it fixed the dropping packets. If you can live with slower USB (network,wifi,usb harddisks), it might work for you. I can use 115200baud through an USBtoRS232 adapter.
by stijn.ghesquiere
Tue Apr 16, 2013 7:33 am
Forum: Automation, sensing and robotics
Topic: photometer/colometer => Philips HUE
Replies: 1
Views: 1620

Re: photometer/colometer => Philips HUE

Shoudl not be too hard/ Buy an i2c light & Color Sensor like this for example: http://www.ebay.com/itm/Light-Color-Sensor-I2C-16-bit-RGBW-for-Controllers-Arduino-w-Pins-Tiny-/330906330001 Just make sure to get a module that uses 3.3v and uses i2c communication. You can drive it directly from the gpi...
by stijn.ghesquiere
Fri Apr 12, 2013 9:57 am
Forum: Automation, sensing and robotics
Topic: BMP085: two questions
Replies: 3
Views: 801

Re: BMP085: two questions

I got a cheap one from ebay. It works perfectly well. I use the Adafruit python library to get it working, which it did at once. It has very little noise and it's very sensitive. It perfecty suits my needs, and teh fact that it also supplies temperature readings is very nice. I have no idea how long...
by stijn.ghesquiere
Fri Feb 15, 2013 3:48 pm
Forum: Python
Topic: Python trademark at risk in Europe
Replies: 1
Views: 647

Python trademark at risk in Europe

There is an upcoming trademark problem for the name 'python' regarding the use in relation to computers and programming. The python foundation asks for help. See here for info: http://pyfound.blogspot.nl/2013/02/python-trademark-at-risk-in-europe-we.html Is there anything we as raspberry pi user can...
by stijn.ghesquiere
Wed Jan 09, 2013 7:34 pm
Forum: Troubleshooting
Topic: Root and passwordsit
Replies: 6
Views: 1082

Re: Root and passwordsit

You're not logged in as 'root' if you login with 'pi'. If you were, you did not have to put 'sudo' in front of the 'halt' command. Sudo gives you root permission for the command/program you start with it. How to delete your own user: Login as pi, and issue 'sudo userdel -r <name>' and that should fi...
by stijn.ghesquiere
Sun May 20, 2012 8:10 pm
Forum: Automation, sensing and robotics
Topic: Greenhouse Automation
Replies: 15
Views: 9933

Re: Greenhouse Automation

I'm testing my raspberry pi as greenhouse controller at the moment. I first build an io-system around a PIC 18F452. I added a 4 channel I2C ad converter, and use power mosfets to drive stuff. I also added two solid state relais for controlling the heavy power stuff (heating). I connected this PIC mi...

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