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by Ronaldlees
Mon May 22, 2017 8:23 pm
Forum: Off topic discussion
Topic: NHS attack on WinXP; would an RP be safer?
Replies: 43
Views: 8679

Re: NHS attack on WinXP; would an RP be safer?

Isn't that just because there are (far) more Win7 than setups than WinXP (but it also shows how many people do not patch regularly as Win7 has had the security fix on the security updates for two months? ). XP was just the NHS headline iirc in the UK. Many more around the world. The other part is t...
by Ronaldlees
Mon May 22, 2017 7:54 pm
Forum: Automation, sensing and robotics
Topic: Is it possible? Wristband tracking with Pi... Question
Replies: 2
Views: 668

Re: Is it possible? Wristband tracking with Pi... Question

You could use OpenCV and wear a bright orange wrist band. Just be sure nothing else in the room is orange! I'd guess it could be pretty quick if the color were unique enough. It wouldn't be perfect, and would likely point on false positives. Real cheap tho ..... :-) But, not sure how it'd be much di...
by Ronaldlees
Mon May 22, 2017 7:42 pm
Forum: Off topic discussion
Topic: NHS attack on WinXP; would an RP be safer?
Replies: 43
Views: 8679

Re: NHS attack on WinXP; would an RP be safer?

Yes, I read too that it was not so much XP, but Win7 that was the major break point. I think that commercial software is held in higher esteem than open source (often hobbyist) built software. There is the thinking that big corporations spending big money on code makes it better. But, companies alwa...
by Ronaldlees
Mon May 22, 2017 3:55 pm
Forum: Off topic discussion
Topic: Suitable replacement for the Rpi?
Replies: 26
Views: 5475

Re: Suitable replacement for the Rpi?

That said, I do use some of the other boards when the application demands it. YEs...so do I, though I'm moving away from two of them this Summer as I get the necessary bits together. I've been using a Cubieboard 2 (Allwinner A20) and Cubieboard 1 (A10) to run the backend of a convention registratio...
by Ronaldlees
Mon May 22, 2017 2:43 pm
Forum: Off topic discussion
Topic: Suitable replacement for the Rpi?
Replies: 26
Views: 5475

Re: Suitable replacement for the Rpi?

As has been said, the Pi serves many purposes, and probably serves yours if you refactor the code. That said, I do use some of the other boards when the application demands it. The XU4 has (easily) the most processing power, but I only have a few apps that need it. The Pi2 harem that I have here doe...
by Ronaldlees
Tue May 09, 2017 5:01 pm
Forum: General discussion
Topic: Portable General Use Monitor
Replies: 11
Views: 4991

Re: Portable General Use Monitor

I personally am using an expensive DoubleSight USB monitor, but don't need to carry it around. You might check out the screens and monitors offered by neosecsolutions for the Pi, not sure if they would meet your specs but they are under $100 with cases, some under $50 although I think those need so...
by Ronaldlees
Tue May 09, 2017 4:52 pm
Forum: Automation, sensing and robotics
Topic: Motion surveillance camera project
Replies: 8
Views: 4441

Re: Motion surveillance camera project

Hi: I'm no OpenCV guru, but someone else has done something that is a little bit along the line of what you have in mind. He uses a combination of OpenCV and Python to enable motion-detection via a web-cam, and then sends the alert over the internet. I suspect the Python code could be modified to pl...
by Ronaldlees
Mon May 08, 2017 11:20 pm
Forum: Automation, sensing and robotics
Topic: Roller shade control over 433mhz
Replies: 4
Views: 2096

Re: Roller shade control over 433mhz

This may, or may not, be relevant, but, please be aware, that the Amateur Radio spectrum, and indeed, Military Radio Spectrum, use 433 MHz, for communications. You may experience some interference, especially if you are in an area where there is an active 'radio repeater'. Usage by Radio Amateurs, ...
by Ronaldlees
Mon May 08, 2017 1:28 pm
Forum: Automation, sensing and robotics
Topic: Roller shade control over 433mhz
Replies: 4
Views: 2096

Re: Roller shade control over 433mhz

Since nobody else is answering ... Based on my quick reading of a few articles on some websites - it seems that more often than not these remotes use proprietary protocols, as do the radio-motors (blinds). From my reading, it seems there are only a couple open protocols. I could guess that unless yo...
by Ronaldlees
Sat Apr 08, 2017 9:37 pm
Forum: Automation, sensing and robotics
Topic: Transmitting pictures wirelessly over 433 MHz?
Replies: 8
Views: 3684

Re: Transmitting pictures wirelessly over 433 MHz?

Actually, that sounds like an interesting project. The 433 MHz band is probably not optimal though. I've seen a lot of 433 MHz questions put on the Pi forum. Some countries have different rules, but in the US, this link gives a good description of the landscape: http://www.edn.com/electronics-blogs/...
by Ronaldlees
Thu Mar 02, 2017 1:06 pm
Forum: General discussion
Topic: Inexpensive 8" 1024x768 Monitor
Replies: 6
Views: 5864

Re: Inexpensive 8" 1024x768 Monitor

Thanks for the post. Finding built-in speakers on such a small monitor is unusual.

The only downside I see is that it's not an LED backlight, so it's pretty power hungry at 12 watts. Might be good choice for mains power tho.
by Ronaldlees
Thu Mar 02, 2017 12:59 pm
Forum: Automation, sensing and robotics
Topic: GPIO output wire length limits?
Replies: 18
Views: 6610

Re: GPIO output wire length limits?

If you really must use wired connection then a current loop is the proper method. The transmitter is a switched current source which will (on signal) output whatever voltage is required to send a set current (20mA is standard) Other solutions are RF: WiFi, BlueTooth etc, opto or off the shelf netwo...
by Ronaldlees
Sat Jan 21, 2017 3:31 pm
Forum: General discussion
Topic: Webcam compatibility
Replies: 1
Views: 715

Re: Webcam compatibility

This link:

http://elinux.org/RPi_USB_Webcams

... seems to indicate it works on the Pi.

I notice it's pretty low resolution by today's standards (640x480) - although a high framerate (75 fps). I don't have one myself, so can't vouch :-(
by Ronaldlees
Fri Jan 20, 2017 10:12 pm
Forum: Automation, sensing and robotics
Topic: Sensing Electric Current with Pi3
Replies: 12
Views: 12606

Re: Sensing Electric Current with Pi3

If the light bulb indicator is a small wattage one, as you say, it kind of throws the current sensor idea out of the window, unless you can find a pretty sensitive one. Maybe the hall effect sensors that mahjongg mentions are more sensitive, but the current sensor path seems complicated by the low c...
by Ronaldlees
Fri Jan 20, 2017 4:13 pm
Forum: Automation, sensing and robotics
Topic: Sensing Electric Current with Pi3
Replies: 12
Views: 12606

Re: Sensing Electric Current with Pi3

Your light bulb would be what? 50 watts or less? So, the current would be on the order of a half amp, which is worse: 2 mV. Even the all-in-one sensors may give false positives once in a while, although that could be mitigated to some extent with a sampling program. OTOH you could have a long winded...
by Ronaldlees
Fri Jan 20, 2017 4:08 pm
Forum: Automation, sensing and robotics
Topic: Sensing Electric Current with Pi3
Replies: 12
Views: 12606

Re: Sensing Electric Current with Pi3

Very interesting project. One thing I always mention when I see these types of messages, is that no "high level" computing platform (i.e. one with the power to run Linux or another kernel with an extended userland of code) - will be 100 percent reliable. So, be wary. Anyway, your post is interesting...
by Ronaldlees
Mon Jan 02, 2017 4:20 pm
Forum: Off topic discussion
Topic: The obvious choice for a case
Replies: 16
Views: 5102

Re: The obvious choice for a case

Ya know I think a simple altoids tin would suffice, credit card size would fit and it would be a great selling point. Just put electrical tape on the bottom of the tin to prevent shorting. As well as cutting out sections in the side to access the ports. A decent example is the ybox platform a frien...
by Ronaldlees
Mon Jan 02, 2017 3:41 pm
Forum: General discussion
Topic: Why buy codecs? Isn't codec free?
Replies: 23
Views: 11836

Re: Why buy codecs? Isn't codec free?

Video rights management is a huge mess, from the perspective of anyone doing anything that parts from the "norm" - meaning mostly Windows and Apple and Android users as the definition of the "norm". That's because Microsoft, Apple, and Android (device makers) - take care of the business for you. Bel...
by Ronaldlees
Mon Dec 19, 2016 2:32 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Impedance of GPIO lines
Replies: 11
Views: 8701

Re: Impedance of GPIO lines

Of course the impedance will vary with frequency. But I think 100 MHZ is too high to matter.
by Ronaldlees
Mon Dec 19, 2016 2:12 pm
Forum: General discussion
Topic: How many Pi;s are dead?
Replies: 19
Views: 3985

Re: How many Pi;s are dead?

I've got lots of Pi B's with broken SD card enclosure / connector thingies. They are far from dead though, they merely have flesh wounds. At some point, perhaps I will screw them all down to one long plank to hold the SD cards properly in place and use them to make a load balancing remote access pi...
by Ronaldlees
Mon Dec 19, 2016 1:58 pm
Forum: General discussion
Topic: How many Pi;s are dead?
Replies: 19
Views: 3985

Re: How many Pi;s are dead?

I put most of my Pi boards inside of relatively large enclosures (~9 inches), and those bigger boxes allow for the inclusion of DC-DC converters and battery boards. I'd more or less standardized on 12 VDC wall warts, feeding the converters. This was a great way to protect the Pis from the voltage of...
by Ronaldlees
Fri Dec 16, 2016 2:22 pm
Forum: General discussion
Topic: GALILEO instead of GPS Receiver
Replies: 7
Views: 6778

Re: GALILEO instead of GPS Receiver

Seems to be a dearth of information about Galileo capable receivers. There also seems to be a bit of sabre rattling by patent holders, so maybe that's the catch. I notice the Ebay unit says that Galileo is "under construction" - so probably needs a future firmware update to actually do Galileo. Or n...
by Ronaldlees
Wed Dec 14, 2016 7:35 pm
Forum: General discussion
Topic: No mixing of solder types
Replies: 31
Views: 6802

Re: No mixing of solder types

Thanks for all the great answers. I've worked with solder for quite a few years, but don't consider that I know that much about the stuff. Sometimes I think we know too much. In the late sixties, I worked with whatever I could get my hands on. In the beginning, that was my father's very oversize plu...
by Ronaldlees
Wed Dec 14, 2016 4:13 pm
Forum: General discussion
Topic: Carputer with GPS Navigation?
Replies: 5
Views: 9004

Re: Carputer with GPS Navigation?

I use a Pi2 for making GPS tracks. I use JOSM (Java for Open street maps). It runs slowly (but IMO tolerably) on a Pi2. Then again - I have more patience than some other folks. :-) But, there are some caveats. While it's OK for pedestrian navigation, you could crash your car if you had to spend time...
by Ronaldlees
Tue Dec 13, 2016 1:34 pm
Forum: Other projects
Topic: Standalone PSK31 transmitter for ham radio
Replies: 7
Views: 5302

Re: Standalone PSK31 transmitter for ham radio

In fact I plan to examine the spectrum of the signal. Not just the harmonics, but the close-in spurs are more important because they are more dificult to filter out. An si570 might be cleaner. Yes, I noticed some "close in" spurs, when using the SDR RX display to look at the clock generator, but I ...

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