15
votes
Accepted
Why do the USB ports and Ethernet port share the same controller?
You're right in your understanding that the shared USB/ethernet bus is something of a bottleneck.
One option is to use a Pi 3 over WiFi. The WiFi chip doesn't share a bus with the USB sockets and ...
- 10.7k
11
votes
Accepted
Transfer a file from Raspberry to Mac
Run the command on your Mac:
scp [email protected]:/path/to/file .
And the file will be transferred to your current directory.
Assuming your Raspberry Pi is accessible through its default hostname ...
- 4,319
7
votes
Why do the USB ports and Ethernet port share the same controller?
The controller is a Microchip LAN9512 and the reason it is used instead of, e.g., a bunch of independent controllers is presumably:
Price. Here's an example of somewhere you can buy 100 of them @ $...
- 58.5k
7
votes
Why do the USB ports and Ethernet port share the same controller?
USB 2.0 has a maximum transfer rate of 480Mb/sec (Megabits)
Now, the actual transfer rate in the real world is far slower.
My Pi 2 has a maximum of 220Mb/sec (Megabits) throughput over USB.
The ...
6
votes
Accepted
Weather Balloon - How to Transmit Data?
At those ranges Gigahertz comms (WiFi/Bluetooth) won't cut it. Check the Pi in the Sky project ,
which uses 433 MHz comms by default.
Depending on your range requirements you might want someone with ...
- 6,215
6
votes
Accepted
Does the Raspberry pi 4 have USB 3.0 or 3.1?
Raspberry Pi 4 supports only USB 2.0 (2 ports) and USB 3.0 (2 ports). All other RPis support only USB 2.0. RPi 4 does not support the higher speeds of USB 3.1. This is due to their hardware ...
- 21.2k
5
votes
NFS transfer speed Raspberry Pi 2 vs 3
Does anyone know how much speed I would gain in the same scenario with a Pi3 (just about..)?
Only if the Pi currently does this with a very high processor usage, say 75%+. This would indicate it is ...
- 58.5k
4
votes
Raspberry Pi Operating system transfer
If you backup a img file of your SD card, you can then flash it too the newer one like you would flash a normal Raspbian etc image. This should be a bit quicker than trying to copy all the files.
...
- 2,513
4
votes
Accepted
Mount.ntfs using 99% of my cpu with Transmission
As Jaromanda X said in the comments, a few google searches on NTFS Linux performance shows this is not uncommon.
Probably the first step gleaned from several threads on the topic is to use lsof to ...
- 531
4
votes
Accepted
Getting Information from one Raspberry to another
As a beginner it may seem a bit taunting on how to actually transfer data, or how to ask the correct question on how to do it. The reason is because there are so many ways to do.
A popular way to be ...
- 17.3k
4
votes
Can I send a Text file using the Audio Jack of the Raspberry Pi 3
There are several solutions:
quietnet -> https://github.com/Katee/quietnet
minimodem -> http://www.whence.com/minimodem/
morse code
- 41
4
votes
Accepted
Digital data reading using GPIO
I am surprised your search did not find any solutions. How do you think computers communicate?
The simplest solution is to use a serial link. For Arduino to Pi connect the Arduino's TX pin to the ...
- 70.6k
4
votes
Using /mnt vs /media for Transmission storage on external hard drive
The default names and structure for linux are defined in the Linux Standard Base (LSB).
Part of this document is the Filesystem Hierarchy Standard.
Herein you find the definition for /media : Mount ...
- 41.9k
4
votes
how to transfer file between two RPI over Wi-fi?
To answer your last point
This is a good "scenario" ?
and with the announcement
I am a a beginner and I wanted to start with a simple project : connecting 2 RPI together and send data( ...
- 41.9k
4
votes
Accepted
Is there a way to use the USB-C port as power and for something else?
The USB-C connector on the Pi DOES NOT implement USB-C.
It is used for power and a USB-2 OTG interface.
- 58.7k
3
votes
Simple data transmission from multiple Arduinos (client) to Raspberry pi (server) wirelessly
You've chosen a difficult route. If there's anything whatsoever you can do to get some cables into the freezer you should do so.
You can now do things with Bluetooth Low Energy (BLE) on a Pi without ...
- 10.7k
3
votes
Transfer a file from Raspberry to Mac
Techraf's answer is good, and what I would do myself. However it won't work if SSH is not enabled. Here are a couple of other alternatives. You could use a service like Dropbox. or what used to be ...
- 34.6k
3
votes
Does Raspberry Pi 3.0 support HDMI 2.0 standard?
Since RPi 3 uses BCM2837 SoC, you're out of luck:
BCM283x supports HDMI V1.3a.
Not sure what the "rate of output" means, but HDMI 1.3a runs at a frequency of 340 MHz and a data rate of 10.2 Gbps. ...
- 27.7k
3
votes
Raspberry Pi zero bluetooth max transfer speed
Bluetooth 4 does not have the same speed capacities as bluetooth 3 + HS.
The high speeds were deprecated after bluetooth 3.
As written on this article.
- 101
3
votes
How can I receive sensor data from my raspberry pi when it is far away from any wifi?
satcomm module
cost: $250
monthly fee: $15
https://www.sparkfun.com/products/13745
- 631
3
votes
Transfer files from Raspberry Pi Zero W to PC over USB
Here's how I do it:
Configure your network services properly. You're using your PiZero as a server of sorts, so you'll want to set your PiZero's IP address to a fixed value. Once you've accomplished ...
- 21.2k
3
votes
Accepted
Handle data while filming with rPI
The Raspberry Pi (all models) feature USB 2.0 ("Hi-Speed") only; which has a net data transfer of 40 MB/s at best (1); real life performance might even be less (2). Share that data rate between ...
- 15.8k
3
votes
Hosting LAMP on SD-card in RPi now - would like to move whole database and website to External USB 3.0 SSD
I want more speed, I wanna be able to upload large files to my webpage
quickly and I think USB 3.0 + External SSD with Exts4 on it will do
the trick nicely.
Mount your external drive to apache2 web ...
- 4,283
3
votes
Importing raspi data from sd card to computer
Raspbian's main partition (containing home and everything) cannot be seen by a Windows computer unfortunately.
A Linux PC would see it fine, and probably a Chromebook or a Mac as well.
If you want to ...
- 1,759
3
votes
Raspberry Pi 4 local network for territories without access to the internet
It is very simple to create a stand alone access point with a Raspberry Pi without internet connection. So all devices supporting WiFi can connect to it and share its data. You can use the RasPi to ...
- 41.9k
3
votes
What are the expected write speed for external storage connected to USB 3 (blue) on Raspberry Pi 4 B
I'm also using JMicron JMS567 SATA 6Gb/s in Bulk Only Transport protocol and I'm getting similar write speed:
Write speed test:
sync; dd if=/dev/zero of=./test.tmp bs=1M count=1024
> 1073741824 ...
- 143
2
votes
NTFS with high CPU usage
Add -o big_writes to your mount commmand or big_writes to /etc/fstab
So the mount command above would become:
mount -i -t ntfs -o big_writes /path/to/partition /mount/point
- 121
2
votes
Accepted
Clone raspberry sd from 32 to 16 GB
Do a backup of your current 32GB SD
You will get a 32GB *.img file, this is OK
Get any Linux computer and download this tool (PiShrink)
Use it like this: ./pishrink my32Gbfile.img newimagefile.img
...
- 921
2
votes
Accepted
Simple data transmission from multiple Arduinos (client) to Raspberry pi (server) wirelessly
I'd recommend evaluating the ESP8266 for your application.
It is a powerful wifi solution that costs ~5$ on amazon and much cheaper on aliexpress for bulk purchases.
There are many boards based off ...
- 2,416
Only top scored, non community-wiki answers of a minimum length are eligible