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69
votes
14answers
348k views

How to force NTPD to update date/time after boot?

The Raspberry Pi lacks a hardware clock. How do I force NTPD to update date/time immediately after every boot? I'm running Raspbian and the Raspberry Pi is connected using an Ethernet cable.
69
votes
7answers
55k views

How do I control the system LEDs using my software?

There are 5 LEDs on the RPi: OK, PWR, FDX, LNK, 10M. I'd like to know if it's possible to control any of these from software i.e. turn them on, or change intensity (or even change colour gasp). And ...
69
votes
8answers
116k views

How do I enable Wake On LAN?

My first thought was to simply start broadcasting WOL magic packets over the network, but my Raspberry Pi is not waking up. So I'm assuming it either doesn't support WOL, or I haven't properly ...
69
votes
2answers
131k views

Which SD cards are compatible?

The site http://www.raspberrypi.org/quick-start-guide says: You will need an SD card with an operating system preloaded before you can boot the Raspberry Pi. A brand-name (not generic) Class 4 ...
68
votes
6answers
133k views

Do I still need rpi-update if I am using the latest version of Raspbian?

I have a 512MB Pi. I am trying to make sure I am getting the most out of it. I just downloaded the latest version of Raspbian and installed it on the Pi. Do I also need rpi-update? Is rpi-update ...
68
votes
10answers
130k views

How do I modify my Raspberry Pi to be powered over PoE?

Is it possible to modify the Pi, so that it can receive it's power via Power over Ethernet (PoE)? I would like to be able to power my unit via the ethernet cable, so that I don't have to worry about ...
67
votes
2answers
100k views

How much power can be provided through USB?

I know that my USB powered Hard Drive doesn't work, but what is the minimum power requirement that the Raspberry Pi can fulfil for devices that connect via USB?
67
votes
7answers
111k views

Does Raspbian's repository have a browsable package list?

Raspbian claims to have "35,0000 Raspbian packages", which is great, but I'm only looking for a package or two before I install it. Is there a browsable repository package list that I can search ...
66
votes
6answers
272k views

How do I install packages from the AUR?

Arch Linux has the AUR (Arch User Repository), a collection of user-built packages. How do I install these packages on Arch Linux ARM though?
65
votes
5answers
76k views

How do I hard reset a Raspberry Pi?

How do I hard reset a Raspberry Pi? Obviously you can power cycle, but is there a more subtle way, like a reset pin? It would be very useful to connect a watchdog in case the Raspberry Pi crashes (...
65
votes
6answers
155k views

Is it possible to install VLC?

I would like to install VLC on my Raspberry Pi and wonder if it is possible? I can not find a distribution that supports it, but wonder if anyone has done this or knows a link to a site or group ...
65
votes
1answer
64k views

How does Raspberry Pi boot?

I have a raspberry mini computer and I am wondering how that thing does whole the boot process. I can compile my own kernel and init ramdisk with my own scripts and build my own minimal linux system ...
64
votes
17answers
274k views

Easiest way to show my IP address?

After I've booted up, what's the easiest way to obtain and display the IP address that the device is currently using? I'm using Raspbian, and ifconfig doesn't appear to be installed. Are there any ...
64
votes
6answers
121k views

Disable screen blanking in X-Windows on Raspbian [duplicate]

We intend to use a RPi at work to drive a status display panel - it will show our project's bug status and a few other statistics of vital importance. I've been trying stop the screen-saver from ...
64
votes
6answers
41k views

How do I build a cluster?

There have been a few articles floating around online over the last few years about building a cluster of computers at home - here for example. The Pi strikes me as a good platform for building / ...
63
votes
5answers
124k views

Can I attach a SATA controller?

I would like to use my Raspberry Pi as a file server (NAS/SMB). Will I be able to attach a SATA/RAID controller?
63
votes
5answers
139k views

What is the maximum current the GPIO pins can output?

What is the maximum amount of current that can be pulled from a single GPIO pin? Does the maximum current decrease if current is being pulled from multiple GPIO pins? From my research, I've found: ...
62
votes
5answers
153k views

Connect Pi to an old laptop screen

So I recently received my Pi in the post and I'm now trying to think what to use it for. I've had a look around and I quite like the idea of attaching a screen to it and using it as an RSS Reader/...
62
votes
8answers
49k views

Is it possible to run real time software?

I know it runs Linux and there are real time patches available for Linux. Would those patches work? Has anybody tried another real-time-os on the Raspberry Pi? The idea is to use the board for ...
61
votes
3answers
19k views

How can I protect against intrusion and malware before connecting it to the internet (especially on a public IP address)?

With the large number of Raspberry Pis in the wild, and the fact that large groups of them are configured identically (when a newly-flashed SD card is installed with one of the few available images), ...
60
votes
12answers
347k views

Why is my audio (sound) output not working?

I can't get the audio running. I don't hear anything and can not play anything. Is there a solution to enable audio?
60
votes
4answers
68k views

How do I attach a GPS receiver?

I would like to hookup a GPS receiver to my Pi so that I can: Get my geographical position Synchronise clock when not connected to network What are my options? Will any hardware supported by gpsd ...
58
votes
3answers
18k views

Is the Raspberry Pi vulnerable to the Spectre or Meltdown exploit?

There are two new serious security flaws discovered, Spectre and Meltdown. Is the Raspberry Pi vulnerable for Spectre and/or Meltdown?
58
votes
7answers
245k views

Can a simple cable convert HDMI output to VGA?

One may buy a simple HDMI-to-VGA cable, or an HDMI-to-DVI cable. Example: on Amazon. However, my vague knowledge is that these cables only work for video cards that have special support for this ...
57
votes
8answers
77k views

Will Raspbian move to 64-bit?

In this page, the official RPi3 announcement states: You’ll need a recent NOOBS or Raspbian image from our downloads page. At launch, we are using the same 32-bit Raspbian userland that we use on ...
57
votes
5answers
103k views

How do I determine the current MHz?

I've been trying to get an accurate reading of my Raspberry Pi's MHz, since I overclocked it in /boot/config.txt My /boot/config.txt is as following: pi@raspbmc:~$ cat /boot/config.txt arm_freq=900 ...
55
votes
6answers
166k views

What password to use to log in after the first boot?

The first time I boot up my Raspberry Pi I get a login screen. What username and password should I use? That is, what is the default password for Raspberry Pi?
55
votes
8answers
429k views

Solving “RTNETLINK answers: File exists” when running ifup

I had this problem when I got my new Wi-Fi dongle and have seen a few people with the same issue. Basically when I have one interface configured and want to swap to the other one, it throws up this ...
55
votes
8answers
205k views

How can I stream H.264 video from the Raspberry Pi camera module via a web server?

So I got the Raspberry Camera today and got stills working fine. Capture an image in JPEG format: raspistill -o image.jpg Capture a 5-second video in H.264 format: raspivid -o video.h264 I do not ...
55
votes
5answers
89k views

Using the Raspberry Pi as a router?

Has anyone used their Raspberry Pi as a routing device? Mainly I want to use it to monitor my network, and it would be great if it had an input and output for Ethernet, but it doesn't, so I am ...
54
votes
10answers
143k views

Enabling SSH on RPi without screen - keystrokes for raspi-config?

I don't have a screen for my Raspberry Pi. I want to SSH into it, but I get Connection Refused, so I presume SSH is not enabled. As advised in other questions I have looked at enabling the ...
53
votes
5answers
132k views

What is the maximum / minimum operational temperature?

As per the title, what are the maximum and minimum operational temperature ratings of the Pi before it stops reliably working? Could this also depend on the SD card in use?
53
votes
11answers
67k views

How can I prevent my Pi's SD card from getting corrupted so often?

I get an I/O error at boot and then get this 'error': (I am running the latest version of Raspbian) Entering kdb (current=0xca82ac80, pid 1) due to keyboard entry kdb> _ And I have seen it before,...
52
votes
10answers
44k views

How can the Raspberry Pi emulate a USB storage device?

USB storage devices, such as USB sticks and harddrives, are common to attach external storage to any kind of computer. How can the Raspberry Pi emulate an USB storage? The easiest application was to ...
51
votes
6answers
149k views

How do I install an OS image onto an SD card?

I have just ordered my Raspberry Pi, and I want to prepare my SD card. How do I install an OS image onto an SD card?
51
votes
4answers
39k views

Emulation on a Linux PC

How can I connect an SD card containing a Raspberry Pi OS to my Linux PC, and boot the OS in an emulator? Why won't VMWare work? What are the limitations of this method? Related: Emulation on a ...
51
votes
7answers
14k views

Where can I find existing projects with instructions?

There are several articles with suggestions what to do with a Raspberry Pi but many of them are only ideas without any instructions. Is there a directory of projects that actually have been realized ...
51
votes
5answers
53k views

Why is the CPU sometimes referred to as BCM2708, sometimes BCM2835?

I've seen the System on Chip of Raspberry Pi referred to usually as "BCM2835" (e.g. on Wikipedia), but sometimes as "BCM2708" (e.g. sources for Linux SPI driver are in bcm2708.c, or in comments to my ...
50
votes
13answers
116k views

What's the cheapest way to get network connectivity to the Pi Zero?

Since the Pi Zero doesn't come with an Ethernet port, I'm wondering what is the cheapest way to get reasonably fast network connectivity to the device? UPDATE By "network connectivity" I mean ...
50
votes
4answers
66k views

SSH not working with fresh install

I recently liberated an old model B from the loft, put NOOBS on an SD card, and installed the latest version of Raspbian on it. I booted it up, attempted to SSH to it from my Mac, but got: ssh: ...
49
votes
10answers
37k views

Can I use Raspberry Pi as a USB peripheral device?

Raspberry Pi has a Micro USB port for power supply. My question is if this port is only for power purposes or can it be used for data as well? I would like to be able to attach my Raspberry Pi as a ...
49
votes
3answers
76k views

How to add custom loading screen?

I would like to make Raspberry PI useful for TV purpose or so... Therefore I would like to show to end user loading image before entering the X-Windows and starting customized desktop... So instead ...
48
votes
4answers
230k views

How do I make serial work on the Raspberry Pi3 (or later model)

My Pi3 serial console produces rubbish and fails to respond to the keyboard.
48
votes
2answers
114k views

Raspberry Pi 3 vs Pi 2 power consumption and heat dissipation

I've seen the announcement of the new Raspberry 3 but didn't find any info regarding power consumption and heating. A 1.2 Ghz 64-bit CPU is great but does it draw a lot more power? Shall heat be an ...
47
votes
9answers
74k views

Can the Raspberry Pi be used as a media center?

I am looking for a simple solution to play videos and music stored on my NAS. I've found the Raspberry Pi and projects like OpenElec and RaspBMC which will run XMBC on the board. My problem is that I'...
47
votes
5answers
84k views

What's the maximum SD card size that the Raspberry Pi will accept? Do larger cards give slower performance?

On my digital camera, I noticed a performance decrease when I used a larger card; will this happen with the Raspberry Pi too? What's the maximum sized SD card it can handle? I see there is ...
46
votes
6answers
164k views

Where does the Raspberry Pi get the time from?

I don't have to set the clock (besides the timezone) on the Raspberry Pi. Where is it getting the time from? About how accurate is it?
46
votes
4answers
66k views

Can I use Raspberry Pi in commercial production?

I'm quite new to Raspberry Pi. I recently started hacking my new RPI with raspbian and working on a video streaming project. I finished my prototype and things are ready for production. RPI is ...
46
votes
6answers
38k views

How do I monitor and/or control the temperature of the SoC?

Is there a way to programmatically monitor the temperature of the BCM2835 SoC? If so, would it do any good? i.e. would temporarily suspending CPU-intensive processes have any chance to reduce the ...
46
votes
3answers
117k views

error - problem connecting to Raspberry Pi 3 with xrdp

I ran: sudo apt-get update sudo apt-get install xrdp I wen't to Windows 10 remote desktop connection and connected to my Raspberry Pi 3: Then I entered default credentials credentials (pi/raspberry)...

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