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by ragnarjensen
Mon Jun 25, 2018 6:46 pm
Forum: General discussion
Topic: 2.4ghz rc receivers
Replies: 6
Views: 341

Re: 2.4ghz rc receivers

I'm not sure what you actually want to do... but if it's reading RC PWM with the RPI; Using an Arduino, it's silly easy to read the pulses from a RC receiver hooked directly to a digital input. Arduino has a pulseIn() function that returns the pulse width directly, in microseconds. RC_receiver.jpg T...
by ragnarjensen
Fri Jun 22, 2018 9:18 am
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

Hi all, First post here! Welcome! 8-) I wanted to know, what is another recommended usb to hdmi displaylink adapter that will work on my pi? I've used a couple of these; https://www.amazon.com/Display-Monitor-Converter-Graphic-Adapter/dp/B008H4JGII They're sold under a lot of different brand names....
by ragnarjensen
Fri Jun 22, 2018 9:04 am
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

@lordaker It looks like you didn't get all of the Xorg.0.log file, the last part seems to be missing.
by ragnarjensen
Tue Jun 19, 2018 7:58 am
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

EDID is a mechanism that is used by the display adapter and the monitor, where the monitor can tell the display adapter which capabilities it has, e.g. resolutions. For some reason your display adapter is not getting the information it wants from the monitor. Does your VGA cable have all 15 pins? Th...
by ragnarjensen
Mon Jun 18, 2018 10:56 am
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

Hi! All is well, thank you. In the messages from dmesg I see a lot of [ 6.177217] EDID block is all zeroes [ 6.177235] udl 1-1.5:1.0: DVI-I-1: EDID invalid. It looks like the DisplayLink adapter doesn't communicate properly with the monitor. I see in you pictures that you are using a VGA cable. Have...
by ragnarjensen
Thu Jun 14, 2018 9:25 am
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

The X log file doesn't show anything being wrong... The output from the dmesg command? Also, what happens if you swap the physicals screens, 221E2 on DisplayLink and 220SW on HDMI? PS: I'm saying that all my Pis are headless. Headless is when a computer doesn't have any screen at all, i.e. I'm unabl...
by ragnarjensen
Wed Jun 13, 2018 6:07 pm
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

What does the X log file say? It's in /var/log/Xorg.0.log on my Raspbian systems.
Also the output from the dmesg command could be interesting.

Note! I don't run USB DisplayLink any longer myself. All my Pis are headless nowadays, so I can't test anything.
by ragnarjensen
Wed Jun 13, 2018 9:50 am
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

I have googled a little on your Kensington K33907 DisplayLink adapter.
Apparently it only supports resolutions up to 1440 x 1050.

--
Ragnar
by ragnarjensen
Tue Jun 12, 2018 3:56 pm
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

And if you have a subsection with Modes in there?

Code: Select all

SubSection	"Display"
    		Modes	"1680x1050"
EndSubSection
I have never had to use the Randr extension myself.

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Ragnar
by ragnarjensen
Mon Jun 11, 2018 12:28 pm
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

The keyword to set screen resolutions is "Modes"
The "Mode" keyword is something very different.

Have you tried without the Subsection Display?

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Ragnar
by ragnarjensen
Mon Jan 29, 2018 9:58 am
Forum: Raspbian
Topic: USB Displaylink
Replies: 60
Views: 30611

Re: USB Displaylink

I think the USB Displaylink driver is included in Raspbian nowadays. You shouldn't have to build it yourself.
As far as I know, the driver only supports USB2 devices. There exists an USB3 driver for Ubuntu, but it's partly closed source and only runs on x86.

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Ragnar
by ragnarjensen
Sat Aug 05, 2017 9:22 pm
Forum: Beginners
Topic: Switch audio output in real time?
Replies: 1
Views: 393

Re: Switch audio output in real time?

A single stereo track. Left channel to the speaker in the prop and right channel to the speaker behind the victim.
No need to switch outputs and it would make the overlap easy to do, too.

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Ragnar
by ragnarjensen
Sat Apr 15, 2017 7:03 pm
Forum: General discussion
Topic: Closing the pi
Replies: 10
Views: 923

Re: Closing the pi

I have the clear version of that case. On the inside of the lid there are four posts for the camera board.
canakit_case_camposts.jpg
Camera board pressed on to posts
canakit_case_camposts.jpg (62.33 KiB) Viewed 611 times
The lens peeks out through one of the holes in the raspberry logo.
canakit_case_cam_in_lid.jpg
RaspiCam in Canakit case
canakit_case_cam_in_lid.jpg (62.84 KiB) Viewed 611 times
The case has slots on all sides for flat cables.
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Ragnar
by ragnarjensen
Sat Mar 11, 2017 1:14 pm
Forum: Beginners
Topic: External led status lights.possible?
Replies: 14
Views: 15969

Re: External led status lights.possible?

When Raspbian went from Wheezy to Jessie, things changed. The Pi3 introduced further changes. This might help you getting the serial console going: http://spellfoundry.com/2016/05/29/configuring-gpio-serial-port-raspbian-jessie-including-pi-3/ https://www.abelectronics.co.uk/kb/article/1035/raspberr...
by ragnarjensen
Sun Oct 16, 2016 8:10 pm
Forum: Beginners
Topic: Help with VU meter
Replies: 1
Views: 497

Re: Help with VU meter

The command line program arecord will display a simple VU meter if you use its verbose flag twice or more.

Code: Select all

arecord -vv  ...
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Ragnar
by ragnarjensen
Thu Oct 06, 2016 11:40 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: LEDs
Replies: 4
Views: 713

Re: LEDs

Maybe connect a LED to the Tx pin?
viewtopic.php?p=736408#p736408

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Ragnar
by ragnarjensen
Wed Oct 05, 2016 7:46 pm
Forum: Troubleshooting
Topic: RPI2 Activity and HDD LED Reassign?
Replies: 8
Views: 1466

Re: RPI2 Activity and HDD LED Reassign?

Haemogoblin wrote:Fantastic will those commands work straight off from booting up in to console?
They can be made to start automatically at boot, yes.
I have added the needed start scripts to the repository, in the folder initscripts.

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Ragnar
by ragnarjensen
Sun Oct 02, 2016 1:11 pm
Forum: Troubleshooting
Topic: RPI2 Activity and HDD LED Reassign?
Replies: 8
Views: 1466

Re: RPI2 Activity and HDD LED Reassign?

I've written some small programs that might help you.
https://github.com/RagnarJensen/PiLEDlights

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Ragnar
by ragnarjensen
Mon Sep 12, 2016 7:01 am
Forum: General programming discussion
Topic: Can we control the on-board leds
Replies: 58
Views: 100400

Re: Can we control the on-board leds

rern wrote:@ragnarjensen
After hours of seacrhing for GPIO LED for USB drive, your code is the only one I've found that do exactly I want. Please advice how to make it works on ArchLinux.
I'm sorry, but I have never used ArchLinux.
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Ragnar
by ragnarjensen
Mon Jan 11, 2016 10:10 pm
Forum: Advanced users
Topic: How long have you run your raspi for?
Replies: 42
Views: 13344

Re: How long have you run your raspi for?

Code: Select all

[email protected]:~$ uptime
 22:59:20 up 688 days, 43 min,  2 users,  load average: 0.09, 0.06, 0.02
Model B Rev 2 that is DNS and DHCP server, DynDNS updater and monitors an UPS.
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Ragnar
by ragnarjensen
Mon Nov 23, 2015 10:34 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Element14 Cirrus logic audio card & line in/out performance
Replies: 2
Views: 531

Re: Element14 Cirrus logic audio card & line in/out performa

It does 192 kHz/24 bit on all in- and outputs. I have used it at that rate to record and play back the multiplexed signal in FM stereo transmissions; audio that goes up to 75 kHz. I know of others that record the ultra-sound of bats with it.
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Ragnar
by ragnarjensen
Mon Nov 23, 2015 9:47 pm
Forum: Beginners
Topic: Received Signal Strengh Indicator by wifi on raspberry
Replies: 9
Views: 5812

Re: Received Signal Strengh Indicator by wifi on raspberry

RSSI has no stated values. It does not correspond to any particular physical property. The WiFi dongles I use (zd1211-based) present values between 0 and 100. I think Atheros-based dongles go from 0 to 127 and Apple devices from -100 to 0. The manufacturers can choose any range they want.

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Ragnar
by ragnarjensen
Sun Nov 15, 2015 8:55 pm
Forum: General discussion
Topic: WiFi activity external LED
Replies: 4
Views: 1584

Re: WiFi activity external LED

Excellent!

Thank you for getting back to report how it went. Feedback is always welcome.
And yes, the more LEDs the better :)

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Ragnar
by ragnarjensen
Sat Nov 14, 2015 5:14 pm
Forum: General discussion
Topic: WiFi activity external LED
Replies: 4
Views: 1584

Re: WiFi activity external LED

I have written a program - netledPi - to do that.
https://github.com/RagnarJensen/PiLEDlights

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Ragnar
by ragnarjensen
Fri Aug 28, 2015 6:20 pm
Forum: Advanced users
Topic: Driver installation (make) - Help needed :}
Replies: 17
Views: 5256

Re: Driver installation (make) - Help needed :}

I built that kernel :-) You can download the headers for it from here: http://www.jensenjensen.com/rpi/linux-headers-3.18.9-v7cludlmmap_3.18.9-v7cludlmmap-2_armhf.deb First, remove the "build" symlink in /lib/modules/3.18.9-v7cludlmmap Then install the package: sudo dpkg -i linux-headers-3.18.9-v7cl...

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