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by VAXXi
Thu May 09, 2013 10:05 am
Forum: Automation, sensing and robotics
Topic: Reading humidity with capacitive sensing
Replies: 12
Views: 8083

Re: Reading humidity with capacitive sensing

Yes, I have calibrated it by immersing the sensor in a glass of water and blowing on it with the hairdryer set to maximum :lol: and then tried to extrapolate a linear formula to get a percentage measurement. I know it's not very accurate or scientific, but I'm not looking for extreme precision. For ...
by VAXXi
Wed May 08, 2013 7:24 pm
Forum: Automation, sensing and robotics
Topic: Reading humidity with capacitive sensing
Replies: 12
Views: 8083

Re: Reading humidity with capacitive sensing

Yes, definitely. Been monitoring for 2 days; the change in humidity is noticeable when opening/closing the balcony door, so I'm very satisfied. I'm using the 2 bottom capacitive areas in parallel and 2 the upper areas in parallel, which give top-humidity and bottom-humidity of the potted soil - more...
by VAXXi
Mon May 06, 2013 9:30 am
Forum: Automation, sensing and robotics
Topic: Reading humidity with capacitive sensing
Replies: 12
Views: 8083

Re: Reading humidity with capacitive sensing

hand hovering about 1 cm above the sensor is in the 600-620s I think you've created a theramin - with the code do the hetrodyning? perhaps this could be adapted for other uses? One half of theremin, yes :) it can be adapted for many uses, like detecting touch and others; demo of Capsense library cr...
by VAXXi
Sun May 05, 2013 8:58 pm
Forum: Automation, sensing and robotics
Topic: Reading humidity with capacitive sensing
Replies: 12
Views: 8083

Re: Reading humidity with capacitive sensing

Well, not that anyone cares :) but in case some poor soul is wondering, here's how to do $SUBJECT. 1st thing to do - use a smaller value resistor. Capsense says a 10 Mohm resistor will respond 4-6 inches away, I've used 3 resistors of 10Mohm in parallel giving 3.33 Mohm total. 2nd thing to do - coup...
by VAXXi
Tue Apr 30, 2013 10:03 pm
Forum: Automation, sensing and robotics
Topic: Reading humidity with capacitive sensing
Replies: 12
Views: 8083

Reading humidity with capacitive sensing

Hello, I'm trying to use the Raspberry Pi to monitor a potted plant. To do this, I have a soil monitor PCB with 3 DS18B20 temperature sensors + 4 capacitive areas - pictures and documentation are here . The idea is to use capacitive sensing on 1 GPIO pin to get a relative measurement of humidity, id...
by VAXXi
Fri Oct 05, 2012 7:54 pm
Forum: Troubleshooting
Topic: Connect Raspi to a Proxy
Replies: 22
Views: 136830

Re: Connect Raspi to a Proxy

Not sure about what Linux distribution you're using, but try adding a "/" at the end of the path (after apt.conf.d) and prefix the commands with sudo in order to make sure it's not a permission problem.
by VAXXi
Tue Oct 02, 2012 4:39 pm
Forum: Raspbian
Topic: Run one of these binaries
Replies: 4
Views: 2046

Re: Run one of these binaries

There's already an ARM/ELF build on that page; you've tried it and it does not work ? Although indeed it says in the footer: 17. minimum CPU of MIPS R6000
by VAXXi
Tue Oct 02, 2012 12:25 pm
Forum: Troubleshooting
Topic: Connect Raspi to a Proxy
Replies: 22
Views: 136830

Re: Connect Raspi to a Proxy

Create a new file in /etc/apt/apt.conf.d/ and name it "10proxy"; put inside the long line in my above post. Apt-get should work immediately after.
by VAXXi
Tue Oct 02, 2012 11:10 am
Forum: Troubleshooting
Topic: Connect Raspi to a Proxy
Replies: 22
Views: 136830

Re: Connect Raspi to a Proxy

apt seems to ignore the HTTP_PROXY environment variable. You can make it work by putting Acquire::http::Proxy "http://yourproxyaddress:proxyport"; in a file placed in /etc/apt/conf.d (named similar to "10proxy" for example). It should also work when placed in /etc/apt/apt.conf but I don't remember i...

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