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by FLYFISH TECHNOLOGIES
Fri Nov 07, 2014 6:09 pm
Forum: Other projects
Topic: Timing system with RPi
Replies: 11
Views: 3046

Re: Timing system with RPi

Hi, Gates with realtime clock and RFID to id the skier will do this. I don't think gates with generic RFID are feasible (ok, you could make them, but they would be useless). If you think about RFID gates, the RFID system would need to have active tags... (think WiFi with 1 local omni aerial and 1 hi...
by FLYFISH TECHNOLOGIES
Fri Nov 07, 2014 12:44 am
Forum: Other projects
Topic: Timing system with RPi
Replies: 11
Views: 3046

Re: Timing system with RPi

Hi, Ivan what do you think how precise solution with mt8880 chip is? Depends also on your VHF radio (how "quickly" their receiver "settles up", what is the treshold/squelch setting, etc.). I'm quite sure that you cannot promote such a system having a 1/100s precision, maybe 1/10s is something what c...
by FLYFISH TECHNOLOGIES
Fri Nov 07, 2014 12:32 am
Forum: Beginners
Topic: FSK Modulation
Replies: 7
Views: 2868

Re: FSK Modulation

Hi,
rushila wrote:computer ethernet ---> raspberry pi for FSK ---->another raspberry for demodulation-----> receive the signal on another computer
Maybe AX.25 has its place in this story... I'd definitely take a couple of hours and google for its fesibility in this context...


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Wed Nov 05, 2014 11:41 pm
Forum: Other projects
Topic: Timing system with RPi
Replies: 11
Views: 3046

Re: Timing system with RPi

Hi, Which components should I use in following examples: This approach is improper (if you'd like to have a 'serious' system).. The main problem with it is that you have problems to define a moment when the event has occurred -> your accuracy is poor. Nowadays, dedicated radio transmitters used in s...
by FLYFISH TECHNOLOGIES
Sun Nov 02, 2014 11:32 pm
Forum: Beginners
Topic: Check the person cleaning at home: is RP the best tool?
Replies: 11
Views: 1732

Re: Check the person cleaning at home: is RP the best tool?

Hi,
ame wrote:It would be be far better to simply trust the person you hired to do the job.
Trust is good, control is better... :roll:


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Sun Nov 02, 2014 11:27 pm
Forum: Beginners
Topic: Could anyone verify I wont fry my Pi?
Replies: 2
Views: 735

Re: Could anyone verify I wont fry my Pi?

Hi, A tip120 I would need to get online however a pn222a I can get locally, Is one '2' digit missing in the label (PN222 2 A) ? the only difference I can see find is that the tip120 has a built in diode, otherwise they are both low draw NPN transistors so my understanding is that in this instance th...
by FLYFISH TECHNOLOGIES
Sun Nov 02, 2014 6:53 pm
Forum: Advanced users
Topic: Automatic e-mail reading
Replies: 3
Views: 846

Re: Automatic e-mail reading

Hi, Where do I get such a script? I don't know how to make PHP-scripts myself. There is no need the script to be implemented in PHP, some years ago I wrote equal functionality in C, for example. You can use any language which can handle input stream -> received email content in passed to the specifi...
by FLYFISH TECHNOLOGIES
Sun Nov 02, 2014 12:14 am
Forum: Networking and servers
Topic: Communication over the internet
Replies: 9
Views: 2916

Re: Communication over the internet

Hi, I'm unsure as to how I could post the data to the web server from within python? Is this where I'd need urllib or httplib? For example, on the server you could create TakeData.php and then you call urllib's urlopen function (something like: urllib.urlopen("http://www.my.domain/TakeData.php?senso...
by FLYFISH TECHNOLOGIES
Sat Nov 01, 2014 11:38 pm
Forum: Networking and servers
Topic: Communication over the internet
Replies: 9
Views: 2916

Re: Communication over the internet

Hi Toby, What I would like to do is to create a link between the two, You need to expose one RasPi, to be accessible from another RasPi (alias: from the public internet). Another option would be to use a server, next to these two RasPis (probably doesn't make sense in your case). Then you should mak...
by FLYFISH TECHNOLOGIES
Sat Nov 01, 2014 9:15 pm
Forum: Beginners
Topic: Webserver with domain
Replies: 14
Views: 3338

Re: Webserver with domain

Hi, I have bought a domain that ends with .eu but dindt buy a webhost So is theire a way to link my .eu domain to my webserver (pi) Yes, sure: 1) ask your internet provider for static IP address, 2) link this assigned IP address to the domain (most likely, this is offered by the domain seller, via a...
by FLYFISH TECHNOLOGIES
Sat Nov 01, 2014 9:08 pm
Forum: General discussion
Topic: No Power On Usb devices
Replies: 2
Views: 550

Re: No Power On Usb devices

Hi,
LeonH wrote:It seem like there is no power going to the mouse because the mouse light is not on and I cannot move it on the screen.
No power switching elements exist on USB power rail, therefore the mouse (USB devices) always receive power.


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Sat Nov 01, 2014 11:01 am
Forum: Beginners
Topic: Check the person cleaning at home: is RP the best tool?
Replies: 11
Views: 1732

Re: Check the person cleaning at home: is RP the best tool?

Hi, I'm soon gonna employ someone who cleans my home. I'll pay that person for 3 hours, but I want to make sure that the person works for what I pay even when I'm not there. You might add a magnetic switch to the entry doors - when the doors are opened, a timestamp is automatically registered... is ...
by FLYFISH TECHNOLOGIES
Sat Nov 01, 2014 10:50 am
Forum: General discussion
Topic: lost of IP address
Replies: 1
Views: 436

Re: lost of IP address

Hi,
Dylannahum wrote:after of a moment short the raspberry lost the IP Address
How do you find out that the IP gets "lost" ?

If ifconfig command lists IP address at its first run, but not anymore when you run this command a minute later, it means that the network connection is lost.


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Sat Nov 01, 2014 10:39 am
Forum: Other projects
Topic: Barcode Project help
Replies: 4
Views: 1804

Re: Barcode Project help

Hi,
Vespi wrote:the printer however i feel may be a problem, as i am not sure how well this would interact without a windows based os,
If you pick barcode printer with serial port interface, then you're 100% sure it can work with RasPi.


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Sat Nov 01, 2014 10:24 am
Forum: Advanced users
Topic: Automatic e-mail reading
Replies: 3
Views: 846

Re: Automatic e-mail reading

Hi, Hints are welcome. There are many solution paths possible... I'd redirect email address to script execution - when the message arrives, a script is executed and mail content is passed to it. See /etc/aliases, for example by adding a line passenger: |/path/to/script.php , the listed script is exe...
by FLYFISH TECHNOLOGIES
Wed Sep 17, 2014 12:32 pm
Forum: Troubleshooting
Topic: Camera doesn't work with GPIO PIR Sensor
Replies: 4
Views: 1097

Re: Camera doesn't work with GPIO PIR Sensor

Hi, I am using a 5.5v pin, ground pin, and GPIO7. 5.5V ? If you're supplying the sensor with 5V, then it probably also outputs 5V(?)... or does it have OC-type output + there is a pull-up resistor present ? This might not be related to the problem you're asking about -> this could be another one. :|...
by FLYFISH TECHNOLOGIES
Wed Sep 17, 2014 9:52 am
Forum: Automation, sensing and robotics
Topic: Have any one connect the Adafruit MMA8451 to raspberry?
Replies: 4
Views: 2156

Re: Have any one connect the Adafruit MMA8451 to raspberry?

Hi Thomas, At my first attempts with i2c I used ready to use libaries and don't know the "repeated starts" command. The "repeated start" might be mandatory in circuits with multiple I2C masters to avoid some potential issues. Since your circuit contains just one master, you can implement the communi...
by FLYFISH TECHNOLOGIES
Wed Sep 17, 2014 9:37 am
Forum: Beginners
Topic: Alternatives to USB hubs?
Replies: 2
Views: 445

Re: Alternatives to USB hubs?

Hi,
Chubak wrote:USB hubs really slow down the data transfer. Are there any alternatives to expand the chip's inputs?
Multiplexer chips.

(P.S. Your one-liner mixing chip's inputs and USB hubs confuses me...)


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Wed Sep 17, 2014 9:32 am
Forum: General discussion
Topic: keypad matrix for mcp23017
Replies: 1
Views: 818

Re: keypad matrix for mcp23017

Hi,
litoy2x wrote:any recommended reference you could share?
Uncle Google quickly returned the link that contains very good generic explanation:
http://blog.komar.be/how-to-make-a-keyboard-the-matrix/


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Wed Sep 17, 2014 9:27 am
Forum: C/C++
Topic: Help please: RPi and PIC18F4550 and IMU sensors
Replies: 1
Views: 646

Re: Help please: RPi and PIC18F4550 and IMU sensors

Hi Akhter, I will be grateful if any one could help me. Since you're mentioning the PIC controller in the subject, let me write key related steps: * take Microchip's USB framework code as a base for the PIC code: - pick USB profile (HID to be considered), - add analog inputs readings in the code, - ...
by FLYFISH TECHNOLOGIES
Tue Sep 16, 2014 11:35 pm
Forum: Automation, sensing and robotics
Topic: Have any one connect the Adafruit MMA8451 to raspberry?
Replies: 4
Views: 2156

Re: Have any one connect the Adafruit MMA8451 to raspberry?

Hi Thomas, I've heard that the Raspberry does not work with the MMA8451, is it? I've heard that any chip can work with the RasPi. Generally speaking, the "problem" is just that for many of them none wrote code so far (and/or some hardware middleware is not available yet)... Feel free to ask the ques...
by FLYFISH TECHNOLOGIES
Tue Sep 16, 2014 12:10 pm
Forum: Beginners
Topic: Connect Blackberry Playbook's LCD panel to Raspberry Pi
Replies: 23
Views: 9137

Re: Connect Blackberry Playbook's LCD panel to Raspberry Pi

Hi,
jphuc96 wrote:thanks for a really hopeful plan b ^^
It is hard to discuss with people who can't believe to facts in the first attempt...


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Tue Sep 16, 2014 12:02 pm
Forum: General discussion
Topic: Sensor Kit
Replies: 18
Views: 15063

Re: Sensor Kit

Hi, The data sheet of the ADC083x series says: "Supply Voltage, Vcc 4.5 V DC to 6.3 V DC" That's in the section "Absolute Maximum Ratings" In the datasheet I'm looking into (by TI) these numbers are listed under "Operating Ratings", where the "Absolute Maximum Rates" section lists (obviously) single...
by FLYFISH TECHNOLOGIES
Tue Sep 16, 2014 10:02 am
Forum: Python
Topic: barcode duplicacy check using pi
Replies: 3
Views: 757

Re: barcode duplicacy check using pi

Hi,
namanvaidya25 wrote:I was thinking of storing string data in array and then comparing it.
If expected amount of records is small (eg. hundred or so), then this could be the option. Otherwise, start thinking about a database.


Best wishes, Ivan Zilic.
by FLYFISH TECHNOLOGIES
Tue Sep 16, 2014 9:48 am
Forum: General discussion
Topic: Turn off USB power or put the power down when needed
Replies: 5
Views: 985

Re: Turn off USB power or put the power down when needed

Hi,
TLlew3 wrote:
FLYFISH TECHNOLOGIES wrote: Putting the device in sleep mode
Would that be the Pi or the 3g dongle?
The dongle.
You should take a look to the device's technical details what are options. One could be to temporarily disconnect it from 3G network (to turn off its "radio part"), for example.


Best wishes, Ivan Zilic.

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