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by Tarcas
Wed Apr 16, 2014 10:00 pm
Forum: Beginners
Topic: Newbie questions
Replies: 6
Views: 1302

Re: Newbie questions

Thinking of getting a model B to replace a tempremental Ubuntu home server. I'm wondering if it will do what I want, and what configuration people reccomend. OK, so I'm used to Ubuntu so Linux shouldn't come as a huge shock. I'm assuming I can install and manage the Pi headlessly? Your install will...
by Tarcas
Wed Apr 16, 2014 9:48 pm
Forum: Beginners
Topic: Driving a 12V fan
Replies: 1
Views: 934

Re: Driving a 12V fan

This video will explain how to use a relay or relay board. The relay board would be much simpler than a separate optocoupler and relay, as those and other necessary components are included. If you're wanting to drive the fan off the Pi's power, don't. Use a completely separate 12v power supply. You...
by Tarcas
Wed Apr 16, 2014 9:26 pm
Forum: Raspberry Pi OS
Topic: Changing Locale Issue
Replies: 28
Views: 100133

Re: Changing Locale Issue

I'm quite content with the GB locales but also getting crashes if I try to upgrade and sure enough it's while dpkg is configuring the locales. As soon as that process starts the box becomes unpingable and I'm having to reform the card each time. Currently I'm running on a 5V 1A adapter for a mobile...
by Tarcas
Wed Apr 16, 2014 8:11 pm
Forum: Automation, sensing and robotics
Topic: Robot IR object detection
Replies: 7
Views: 2685

Re: Robot IR object detection

If the receiver is digital and works on 3.3v, it's probably trivial. If not, it may take some doing, but with the right design, the Pi can work with just about any sensor I've seen. Post a link to the datasheet of the sensor in question and we can offer advice. With vague info, all we can give back ...
by Tarcas
Wed Apr 16, 2014 8:01 pm
Forum: Automation, sensing and robotics
Topic: What breadboard Do I need
Replies: 14
Views: 3073

Re: What breadboard Do I need

A breadboard will keep things in place fine, as long as it's not moved much. Cheap parts can have thin wires which pull out more easily, but they won't fall out on their own. Now if someone knocks it off the table or drags a wire across it, you may have to adjust/reposition/re-insert some parts, but...
by Tarcas
Wed Apr 16, 2014 1:10 am
Forum: Automation, sensing and robotics
Topic: What breadboard Do I need
Replies: 14
Views: 3073

Re: What breadboard Do I need

If you don't plan on doing it soon, I assume you'll be playing around with it and/or experimenting before then. I'd get the bigger board. Way more versatile. If you choose not to take ShiftPlusOne's advice and use the perfboard and don't need the extra size of the larger board, you can always pick u...
by Tarcas
Wed Apr 16, 2014 1:05 am
Forum: Beginners
Topic: video in via RCA
Replies: 1
Views: 319

Re: video in via RCA

You'll need a USB device that's capable of receiving that sort of input, and that's also supported in Linux. Sorry I don't have a specific recommendation.
by Tarcas
Wed Apr 16, 2014 12:15 am
Forum: Beginners
Topic: uncommunicative pi network (samba+motion)
Replies: 4
Views: 1514

Re: uncommunicative pi network (samba+motion)

So far the system works great on my local network, but once I have everything connected to the intranet/wifi my devices are unable to communicate with each other. Each pi-cam and the samba server have been assigned static IPs on the wifi and based on ifconfig it appears that they are all communicat...
by Tarcas
Wed Apr 16, 2014 12:02 am
Forum: Beginners
Topic: Toggle a device with external power source
Replies: 7
Views: 1849

Re: Toggle a device with external power source

Come to think of it, if your Pi is on one side of the opto-isolator and the battery is on the other side, you shouldn't need to connect the two grounds. If you're just using transistors and not isolating the circuits, you will need to connect them.
by Tarcas
Tue Apr 15, 2014 11:52 pm
Forum: Beginners
Topic: Errors when removing packages from rubbish bin
Replies: 3
Views: 538

Re: Errors when removing packages from rubbish bin

If you used apt-get install to install them, use apt-get remove to remove them.
If not, how did you install them?
by Tarcas
Tue Apr 15, 2014 11:43 pm
Forum: Beginners
Topic: PWM on GPIO pins
Replies: 2
Views: 998

Re: PWM on GPIO pins

I don't believe the loop has to be infinite, but your program does have to remain running for software PWM to continue modulating the GPIO pin's pulses. I see no reason you couldn't, for example, set the PWM, sleep for 30 seconds while the motor moves at the modulated speed, and then clean up and ex...
by Tarcas
Tue Apr 15, 2014 11:04 pm
Forum: Automation, sensing and robotics
Topic: Extreme Low-Cost 3D Printer
Replies: 10
Views: 8720

Re: Extreme Low-Cost 3D Printer

- If I supplied 1A to RaspPi, 700mA goes to RaspPi and the rest, 300mA goes to stepper motor ( depending on the rate of stepper motors ) Not at all. If you supply 1A to RasPi, the RasPi will use what it needs. The GPIO header is limited to 16 mA with a max total of 50 mA. Not nearly enough to drive...
by Tarcas
Tue Apr 15, 2014 10:30 pm
Forum: Raspberry Pi OS
Topic: Prevent DHCP release upon shutdown?
Replies: 8
Views: 2939

Re: Prevent DHCP release upon shutdown?

My experience has been that in a relatively non-changing network, fixed is a good approach, but here devices are frequently added, & removed from the LAN, so fixed becomes awkward. Usually I address devices as: somedevice.local which works just fine. The other day though I installed an "add-on" for...
by Tarcas
Tue Apr 15, 2014 4:46 am
Forum: Beginners
Topic: Toggle a device with external power source
Replies: 7
Views: 1849

Re: Toggle a device with external power source

I thought of using something like a relay or a transistor, but couldn't find any that work with with small currents. I would think that either would work with the amount of current that an electromagnet would draw. That's all a relay is: an electromagnet that pulls a switch closed. Take a look at t...
by Tarcas
Tue Apr 15, 2014 4:22 am
Forum: Advanced users
Topic: Heartbleed openssl vulnerability
Replies: 58
Views: 22957

Re: Heartbleed openssl vulnerability

No problem, holding the packages would probably be a good idea for the sake of figuring out the issue if that's possible for you, assuming you don't want to hold too many back. I don't want to give bad advice though and have you hold one package and forget another and have something break so be car...
by Tarcas
Tue Apr 15, 2014 4:12 am
Forum: Advanced users
Topic: management console for multiple Pi
Replies: 9
Views: 3527

Re: management console for multiple Pi

One way to do this would be having the Pis connected to a network share on the Windows machine. On boot or as a cron job they could be configured to check the share and if there's a script there copy it to a local directory and run it (pretty sure you can't execute on cifs shares but I may be wrong...
by Tarcas
Tue Apr 15, 2014 3:48 am
Forum: Automation, sensing and robotics
Topic: Control Relay Switches via Android using a Raspberry Pi
Replies: 165
Views: 90036

Re: Control Relay Switches via Android using a Raspberry Pi

That's strange. The commands are correct, and removing power should certainly power down the relay. Sounds like you have a bad transisitor on the board, that's not switching off to remove the power from the relay. Do you have any LEDs around to test the GPIO pin to make sure that's switching off pro...
by Tarcas
Tue Apr 15, 2014 3:34 am
Forum: Raspberry Pi OS
Topic: Raspbian Won't Boot
Replies: 14
Views: 3185

Re: Raspbian Won't Boot

You would use Windows to install NOOBS, and let NOOBS install your OS(es). Noobs keeps a small partition that Windows can read, but sets up the rest of the drive as ext4 partitions that Linux uses efficiently but Windows thinks are full of corrupted data or something, since it doesn't have drivers t...
by Tarcas
Mon Apr 14, 2014 5:46 pm
Forum: Automation, sensing and robotics
Topic: Drive RC directly Through PI
Replies: 1
Views: 484

Re: Drive RC directly Through PI

Build it in layers. Get the web interface working separately from the controller side. Then get them to talk to each other. Tackling a project made of 20 small pieces is a lot easier than building a project 20 times as big. It's also easier to design and debug as well, since you can take out any pie...
by Tarcas
Mon Apr 14, 2014 3:39 pm
Forum: Beginners
Topic: Raspberry Pi Powered from AC USB Hub
Replies: 21
Views: 36547

Re: Raspberry Pi Powered from AC USB Hub

How can we tell if any hub is capable of providing power to the raspberry pi, other than of course unplugging the raspberry pi and seeing if it still remains powered ? ( as someone else suggested testing in this thread ) I suspect anything that has usb to micro usb will power it, can anyone confirm...
by Tarcas
Mon Apr 14, 2014 3:35 pm
Forum: Beginners
Topic: programming ideas
Replies: 4
Views: 740

Re: programming ideas

If you want to work with the GPIO, look up the tutorials associated with Gordon's WiringPi project. It'll start you out with blinking an LED, and work you up to a crosswalk simulator with 5 LEDs and a button. Good place to start for electronics control. You'll need at least a breadboard, LEDs, resis...
by Tarcas
Mon Apr 14, 2014 3:24 pm
Forum: Beginners
Topic: Cannot resolve hostname
Replies: 25
Views: 7979

Re: Cannot resolve hostname

Aha, If you're trying to use Wifi but haven't set up the credentials, that's probably the problem. If you plug the Ethernet port into your router, that should be straightforward, and it should "just work." With Wifi, you need to configure it to match the settings in the router (SSID, password, encry...
by Tarcas
Mon Apr 14, 2014 3:12 pm
Forum: Advanced users
Topic: Munin server on a Raspberry Pi. Good idea?
Replies: 4
Views: 5330

Re: Munin server on a Raspberry Pi. Good idea?

I don't know anything about Munin, but if it needs a lot of CPU, it's not going to work well on a Pi. Remember, the Pi has about equivalent power to a Pentium II processor, and if you're running that alongside something that needs almost all of that (XBMC) you're going to be disappointed, I think.
by Tarcas
Mon Apr 14, 2014 3:10 pm
Forum: Automation, sensing and robotics
Topic: Control Relay Switches via Android using a Raspberry Pi
Replies: 165
Views: 90036

Re: Control Relay Switches via Android using a Raspberry Pi

I have been playing a bit more with it. If I switch on my pi. The green light is out. I then use the app to activate relay one. The relay then clicks and the green light comes on. I then switch off using the app and nothing happens. The green light stays on. If I quickly switch relay one on/off the...
by Tarcas
Sun Apr 13, 2014 8:30 pm
Forum: Raspberry Pi OS
Topic: Mount folder with space in name
Replies: 5
Views: 6707

Re: Mount folder with space in name

Enclose the path in quotes, e.g. cd "/path/with spaces in the name" This works, but alternately you can "escape" the space, by prefixing it with a \ (to tell the shell that "the next character I mean as a literal, do not interpret it as having another meaning.") cd /mnt/windows/My\ Favorite\ Folder...

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