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by FLYFISH TECHNOLOGIES
Tue Jan 07, 2014 10:00 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Do I need a timer to add a safe restart button?
Replies: 12
Views: 2127

Re: Do I need a timer to add a safe restart button?

Hi, There is one thing that will help prevent card corruption. Whenever a write to a file has occurred in your application, call sync(). We're not discussing here about OS buffers, but SD card internal tasks.... SD cards are usually more than just a plain memory array. To increase their lifetime, th...
by FLYFISH TECHNOLOGIES
Tue Jan 07, 2014 9:48 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Do I need a timer to add a safe restart button?
Replies: 12
Views: 2127

Re: Do I need a timer to add a safe restart button?

Hi, Does this mean that the million Pi users that are removing power when just the red LED is illuminated are risking SD card corruptions. I'd guess that most users even don't perform shutdown... Should we all be waiting for 30 seconds? Yes. Since this is all going on internally inside SD card, you ...
by FLYFISH TECHNOLOGIES
Mon Jan 06, 2014 11:03 pm
Forum: Other projects
Topic: GUI system for small screen?
Replies: 4
Views: 1136

Re: GUI system for small screen?

Hi, I have a driver for it, and I actually have gotten it working with xwindows, but it doesnt work that well. I've also got it working GREAT with the terminal, and I could see my self using it often with media servers as an easy screen. Ok, I see. Since your usage scope is rather limited, then you ...
by FLYFISH TECHNOLOGIES
Mon Jan 06, 2014 10:46 pm
Forum: Other projects
Topic: GUI system for small screen?
Replies: 4
Views: 1136

Re: GUI system for small screen?

Hi, Is there a better GUI system that would work with such a small screen? Ok, you have two options... is your screen going to be a "system display" or not ? If you're thinking about it as a system display, then you need a driver for it... and I haven't seen available one for this small resolution. ...
by FLYFISH TECHNOLOGIES
Mon Jan 06, 2014 10:33 pm
Forum: Other projects
Topic: How to create wireless doorbell
Replies: 26
Views: 9432

Re: How to create wireless doorbell

Hi, all help will be greatly appreciated. My first reaction: it is total overkill to use RasPi in your scenario... However... if you cannot think of anything else for your project, then you could add some features - for example, to make few snapshots when the doorbell is triggered and save these pic...
by FLYFISH TECHNOLOGIES
Mon Jan 06, 2014 4:42 pm
Forum: Beginners
Topic: Raspberry pi project site started post your ideas here
Replies: 3
Views: 763

Re: Raspberry pi project site started post your ideas here

Hi, no one ideas ;) Probably a bunch of ideas... but, most likely, none is interested in publishing them on your site... What you might try is to search for ideas/projects around by yourself and collect/compose news/links. As a result, you might get some permanent audience... Additionally, I assume ...
by FLYFISH TECHNOLOGIES
Mon Jan 06, 2014 11:19 am
Forum: General programming discussion
Topic: GSM MODULE WITH RASPBERRY PI
Replies: 2
Views: 1992

Re: GSM MODULE WITH RASPBERRY PI

Hi, Can anyone tell me the procedure for sending AT commands to a GSM module from the Raspberry pi... Also I want to know the circuit connections that are required for establishing the connection... Let's suppose that your GSM module communicates over serial port. Therefore, you need your RasPi to b...
by FLYFISH TECHNOLOGIES
Sun Jan 05, 2014 4:15 pm
Forum: General discussion
Topic: How to send gpsd data through the internet
Replies: 37
Views: 15042

Re: How to send gpsd data through the internet

Hi, Do you have any examples on how to http post my long lat and time into one Url post code... For testing the server side code, simply open your browser and type " http://www.myserver.net/mycode.php?lat=14.59280&lon=120.98182&time=20140105T171215Z " To do the same from Python, call wget with this ...
by FLYFISH TECHNOLOGIES
Sun Jan 05, 2014 4:03 pm
Forum: Other projects
Topic: Excercise bike (charity project)
Replies: 2
Views: 881

Re: Excercise bike (charity project)

Hi, So I am looking at a way of capturing the miles cycled on the bike You need to count number of revolutions of the bike's wheel (I imagine that this is an exercise bike with one front wheel). The sensor could be optical (you place a marker on the wheel and observe/count reflections) or you could ...
by FLYFISH TECHNOLOGIES
Sun Jan 05, 2014 2:51 pm
Forum: Beginners
Topic: "Making" a charger - advice!
Replies: 6
Views: 1075

Re: "Making" a charger - advice!

Hi, So with that in mind, can anybody advise whether it'd be ok to cut the end off the adaptor, chop my USB cable and (very carefully and after checking the wires) wire the two together to give my Pi a mains powered feed? From "wiring perspective" this is ok. But you should read also this thread: ht...
by FLYFISH TECHNOLOGIES
Sun Jan 05, 2014 2:22 pm
Forum: General discussion
Topic: How to send gpsd data through the internet
Replies: 37
Views: 15042

Re: How to send gpsd data through the internet

Hi, Instead of Printing I should use HTTP post and post Each of them through my server... Any suggestion here? Collect this data into a single URL string and post it once at the end. so the file that I should create is a text file not a variable or something? Ame wrote about server side... this is o...
by FLYFISH TECHNOLOGIES
Sun Jan 05, 2014 9:15 am
Forum: Python
Topic: Making a Quiz game with python and a breadboard controller p
Replies: 23
Views: 4737

Re: Making a Quiz game with python and a breadboard controll

Hi, 1)How do I store and retrieve my questions? You could use a text file(s) or a database. I'd select the database. You can get all details in virtually any tutorial how to use database. Next to questions&answers, the remaining data (points count, number of questions asked) can be stored in local v...
by FLYFISH TECHNOLOGIES
Sat Jan 04, 2014 10:00 pm
Forum: Other projects
Topic: Helping A Young Man In A Wheelchair
Replies: 5
Views: 974

Re: Helping A Young Man In A Wheelchair

Hi, I suspect the hardest part will be optimising the menus so he will be able to find what he wants as quickly as possible. If I were you, I'd start with tree-structure. Frequently used actions/items are closer to the top (starting) node. What you have to do next is to attach a hits counter to each...
by FLYFISH TECHNOLOGIES
Sat Jan 04, 2014 8:33 pm
Forum: Networking and servers
Topic: Network video surveillance
Replies: 9
Views: 2940

Re: Network video surveillance

Hi, And what about the LAN side of the project? The server-raspberry can pick the video from the other camera-raspberry simply with theyr IPs and put it over the net (if the outside connection will work propely)? I played a bit with webcam (Logitech C920) and Motion... it works ok also outside local...
by FLYFISH TECHNOLOGIES
Sat Jan 04, 2014 7:14 pm
Forum: Beginners
Topic: Breakout board with simple protection circuit
Replies: 4
Views: 950

Re: Breakout board with simple protection circuit

Hi, So..... back to moving my components around! I've made some exercise with your board... I didn't change the schematics, although some connectors' pins swapping could significantly optimize layout to make it even slightly smaller: http://www.flyfish-tech.com/pub/Pi-pcb-test.png I didn't change PC...
by FLYFISH TECHNOLOGIES
Sat Jan 04, 2014 3:46 pm
Forum: Beginners
Topic: Combining Power Supplies
Replies: 4
Views: 747

Re: Combining Power Supplies

Hi, Unless I am wrong.... I don't think you're wrong... I just took some margin and one key possibility - that the screen is switched off or enters power-save mode. You can read that switchers efficiency can be pushed even up to 97% or so, but it is very likely that the "real switcher" has lower eff...
by FLYFISH TECHNOLOGIES
Sat Jan 04, 2014 12:31 pm
Forum: General discussion
Topic: Virtual machine in Raspberry
Replies: 13
Views: 45145

Re: Virtual machine in Raspberry

Hi, We have an application in an industrial setting (high temperatures) that runs under win95, basically a display of data that ties to a sql server. I'm sure that at the end you're going to port this win95 application. According to your short description about its goals, this is a viable approach.....
by FLYFISH TECHNOLOGIES
Sat Jan 04, 2014 2:03 am
Forum: Beginners
Topic: Combining Power Supplies
Replies: 4
Views: 747

Re: Combining Power Supplies

Hi, What I'm wondering is if it's possible to combine these power supplies somehow so that I'm only using one socket? Yes, you could have "one socket" system... Firstly, you have to be sure that your 12V screen's power supply can provide 1.5A more current than required by the screen. Else, you need ...
by FLYFISH TECHNOLOGIES
Sat Jan 04, 2014 1:43 am
Forum: Automation, sensing and robotics
Topic: multiple GPIO triggering issue
Replies: 26
Views: 4552

Re: multiple GPIO triggering issue

Hi, since they will all pull off the same 3.3v rail anyway can I simply pull the pull up current for each pin from the gpio side of my 1wire or is that a stupid idea? .... huh, I'm not sure that I understand the question... If you ask to connect pull-up resistors to 3.3V GPIO pin, then the answer is...
by FLYFISH TECHNOLOGIES
Sat Jan 04, 2014 1:31 am
Forum: Beginners
Topic: Breakout board with simple protection circuit
Replies: 4
Views: 950

Re: Breakout board with simple protection circuit

Hi, Generally speaking, your PCB design is ok. There are just few things which I'd do in a different way... I'd use different approach according to elements location - your priority is placement of resistors and diodes according to edge connectors. I'd use GPIO connector as this starting point. Next...
by FLYFISH TECHNOLOGIES
Fri Jan 03, 2014 2:04 pm
Forum: Advanced users
Topic: rpi gpio pins voltage
Replies: 9
Views: 1201

Re: rpi gpio pins voltage

Hi, ok, work this: http://www.conrad.nl/ce/nl/product/503328/Relaisplaat-REL-PCB4-met-relais-5-V-spoel-Conrad-REL-PCB4-1-5-V-1-wisselaar-50-W-110-VA GPIO pins are 3.3V, this page mentions just 5V... There is no schematics available to find out if it works with 3.3V signals... No, I'm not planning to...
by FLYFISH TECHNOLOGIES
Fri Jan 03, 2014 1:37 pm
Forum: Advanced users
Topic: rpi gpio pins voltage
Replies: 9
Views: 1201

Re: rpi gpio pins voltage

Hi,
rpiformy wrote:cin use a relais? well
Yes.
Use google for additional information and details...


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Fri Jan 03, 2014 1:34 pm
Forum: Advanced users
Topic: rpi gpio pins voltage
Replies: 9
Views: 1201

Re: rpi gpio pins voltage

Hi,
rpiformy wrote:why not?
Because you can burn RasPi... it is designed for low loads only, and motors are not low loads.


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Fri Jan 03, 2014 1:31 pm
Forum: Advanced users
Topic: rpi gpio pins voltage
Replies: 9
Views: 1201

Re: rpi gpio pins voltage

Hi,
rpiformy wrote:i will connect a motor.
can i do it with no relais?
Yes, if you use other power element (eg. power transistor).
Do NOT connect the motor directly to GPIO pin !


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Fri Jan 03, 2014 3:38 am
Forum: Other projects
Topic: RNG Generator
Replies: 3
Views: 1209

Re: RNG Generator

Hi, Ultimately I'm looking at a DIY version of the entropykey. I remember one article about DIY true random generator. It was based on FPGA and the author souded like a very competent person, describing several interesting details, including testing methods. This article was published in Circuit Cel...

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