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by karlkiste
Mon Nov 18, 2013 6:34 pm
Forum: Other projects
Topic: Is it possible to get my RPi to tell Windows it is a device?
Replies: 19
Views: 5397

Re: Is it possible to get my RPi to tell Windows it is a dev

Those cables do exist (e.g. http://www.datapro.net/products/usb-2-0 ... cable.html ), but you can't simulate keyboard and/or mouse using them afaik.

Why don't you want to use rdesktop via network? It does all you're asking for.
by karlkiste
Mon Nov 18, 2013 5:16 pm
Forum: Camera board
Topic: 2 camera boards for one RPi
Replies: 8
Views: 2418

Re: 2 camera boards for one RPi

I've been thinking about how I would do a day/night camera.

I'd buy a IR-cut filter. They're not very cheap, you can get them from photography shops. Using a servo, I'd move the filter in front of the lens to get right colors during the day, and remove it at night to make use of IR illumination.
by karlkiste
Mon Nov 18, 2013 5:11 pm
Forum: Automation, sensing and robotics
Topic: Reading a 7-segment display from controller
Replies: 15
Views: 4788

Re: Reading a 7-segment display from controller

A little appendix to the previous post which I agree with in general:

Depending on the multiplexing frequency of the display, it might even be impossible to read it from the pi using tapped signals. Often, displays are multiplexed at 100Hz or so, that would be ok. It could however be much higher.
by karlkiste
Mon Nov 18, 2013 12:01 pm
Forum: Other projects
Topic: Is it possible to get my RPi to tell Windows it is a device?
Replies: 19
Views: 5397

Re: Is it possible to get my RPi to tell Windows it is a dev

Act as a USB device: Impossible. The USB hardware cannot be set to client mode. *Cough* http://www.raspberrypi.org/phpBB3/viewtopic.php?f=63&t=15696#p159641 From that link: "Yes, Model-A should be able to work in slave mode." We're talking here about a model B, I think. On a model A, it is not easy...
by karlkiste
Mon Nov 18, 2013 10:51 am
Forum: Other projects
Topic: Is it possible to get my RPi to tell Windows it is a device?
Replies: 19
Views: 5397

Re: Is it possible to get my RPi to tell Windows it is a dev

Act as a USB device: Impossible. The USB hardware cannot be set to client mode.

Use the Pi as a "remote Windows workstation" via network: easy. Just install rdesktop and connect to the windows machine.
by karlkiste
Sun Nov 17, 2013 4:02 pm
Forum: General discussion
Topic: Power supply problems (too many amps)
Replies: 8
Views: 2375

Re: Power supply problems (too many amps)

The power supply tries it's best to keep the output at 13.5V. It gives the current it is asked for. If the motor asks for 3A, 3A will be running until the power supply switches off or dies. The power supply could reduce the current by reducing the voltage, but that's not its job. The supply is fully...
by karlkiste
Sun Nov 17, 2013 3:42 pm
Forum: Troubleshooting
Topic: GPIO Pings re-assigment?
Replies: 9
Views: 1720

Re: GPIO Pings re-assigment?

If your RS232 sending device sends only 0V/3.3V, but on a DB9 connector, you still cannot connect it directly. The voltage levels may be right, but the logic is not. You'll need an inverter at least. RS232 defines a "1" as -3..-15V and "0" as +3..+15V, while the pi assumes 1 to be +2.5V..+3.3V and 0...
by karlkiste
Sun Nov 17, 2013 3:31 pm
Forum: Advanced users
Topic: Running Raspberry on 3.3 V
Replies: 33
Views: 22201

Re: Running Raspberry on 3.3 V

The risk of damaging the Pi is minimal and you certainly don't want to risk losing your payload because the batteries died before you got to it. The batteries should not be affected. If 5V and 3.3V rails are wired to 3.3V both, the LDO shouldn't consume more than a few milliamperes (max. 10 mA says...
by karlkiste
Mon Nov 04, 2013 3:49 pm
Forum: General discussion
Topic: Serial Video Output, multiple TFT
Replies: 8
Views: 2870

Re: Serial Video Output, multiple TFT

A good quality HDMI splitter is likely more expensive than three extra pis...
by karlkiste
Sat Nov 02, 2013 6:39 pm
Forum: Other projects
Topic: Portable case: Shortening the micro usb plug.
Replies: 7
Views: 2433

Re: Portable case: Shortening the micro usb plug.

Mikumiku747 wrote: Thanks for all the great responses, but to those who suggested the 5v rail, I'm already using that as a power source for my screen.
So, cut the power cable to the screen, and feed the 5V to this cable. It will feed the display and the pi.
by karlkiste
Sat Nov 02, 2013 6:34 pm
Forum: Raspbian
Topic: GPIO to SYSFS
Replies: 3
Views: 1318

Re: GPIO to SYSFS

The file is not updated, as it is no file in that sense.

Only if read, the value that seems to come from the file ist generated by the kernel.
by karlkiste
Sat Nov 02, 2013 8:19 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Using GPIO to multiple switches (as well as sensors)
Replies: 14
Views: 4072

Re: Using GPIO to multiple switches (as well as sensors)

There are flow sensors using doppler effect, which do not obstruct the flow. They can actially measure the speed of the water, but they're not really cheap I think.
by karlkiste
Sat Nov 02, 2013 8:02 am
Forum: Advanced users
Topic: Running Raspberry on 3.3 V
Replies: 33
Views: 22201

Re: Running Raspberry on 3.3 V

I've read the link, and think it might be possible. There should however be no need to desolder the regulator - it should be possible to just feed 3.3V to both the 3.3 and 5V pins on the GPIO header. The regulator shouldn't mind having input and output at the same level as long as it's not higher th...
by karlkiste
Sat Nov 02, 2013 7:50 am
Forum: Raspbian
Topic: Installing flash possible?
Replies: 9
Views: 1578

Re: Installing flash possible?

To my knowledge, the original adobe flash player is discontinued, no new versions can be expected. There's a linux version, but afaik only for intel platform.

Therefore, I think you are right: No chance for flash, at least not from adobe.

You could try gnash or swfdec or something.
by karlkiste
Sat Nov 02, 2013 7:46 am
Forum: Troubleshooting
Topic: Unstable USB external drive
Replies: 6
Views: 1339

Re: Unstable USB external drive

"entirely self-powered" = not drawing any power from the pi. Not for the drive itself, and not for any part of the controller or interface electronic.
by karlkiste
Sat Nov 02, 2013 7:08 am
Forum: Other projects
Topic: Portable case: Shortening the micro usb plug.
Replies: 7
Views: 2433

Re: Portable case: Shortening the micro usb plug.

Yes, you can "skin" the plastic of a plug to be able to bend it shorter than usual.

Other (not officially reccomended) solder-free solutions are back-powering through one of the USB-ports or the power pins at the GPIO.
by karlkiste
Fri Nov 01, 2013 4:57 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Using GPIO to multiple switches (as well as sensors)
Replies: 14
Views: 4072

Re: Using GPIO to multiple switches (as well as sensors)

A little off-topic to this forum, but... Be careful when you have current go through water. I fear, that aluminium *will* corrode when conducting current through water. High-grade stainless steel might be a better choice, but the only material which will undoubtedly be absolutely safe is platinum. A...
by karlkiste
Thu Oct 31, 2013 9:03 pm
Forum: Deutsch
Topic: Neues Modell?
Replies: 11
Views: 3123

Re: Neues Modell?

Die stehen jetzt jeweils in vierer- oder fünferpacks in verschiedenen Elektronikmärkten und bespielen dort Ausstellungsstücke wie Fernseher und Stereoanlagen mit HDMI-Eingang.
by karlkiste
Thu Oct 31, 2013 8:14 pm
Forum: General discussion
Topic: Can/should the raspi control 100+ LEDs?
Replies: 12
Views: 4479

Re: Can/should the raspi control 100+ LEDs?

That strip is not good for the boblight thing. It can change color, but the whole strip has always only one color. With the WS2801-type LEDs, each LED can have its own color.
by karlkiste
Thu Oct 31, 2013 7:16 pm
Forum: General discussion
Topic: Can/should the raspi control 100+ LEDs?
Replies: 12
Views: 4479

Re: Can/should the raspi control 100+ LEDs?

A buffer is simply a buffer, nothing raspi-specific. I use a 74HCT245 to shift the 3V3 output level to 5V and make eight outputs follow one GPIO pin.

The raspi cannot dim LEDs, the WS2801-LEDs used for the boblight have a dimming circuit built-in. This circuit can be controlled by the pi.
by karlkiste
Thu Oct 31, 2013 6:26 pm
Forum: General discussion
Topic: Can/should the raspi control 100+ LEDs?
Replies: 12
Views: 4479

Re: Can/should the raspi control 100+ LEDs?

If all the LEDs should do the same, you don't need a GPIO pin for each strip. You can just use buffers, which send the same signal from one GPIO pin to all the strips. I'm currently working on a project where one pi will control about 3500 LEDs, each individually, through one pin ;-) But that's anot...
by karlkiste
Thu Oct 31, 2013 5:39 pm
Forum: Deutsch
Topic: Neues Modell?
Replies: 11
Views: 3123

Re: Neues Modell?

Es sieht aus, als kostet ein Cubieboard3 um die 60€. Ich hab letztens 1000 model A Pis verbaut. Mit dem Cubieboard3 hätte ich da im Einkauf was um die 30000€ mehr ausgegeben. Wichtig war nur, Full-HD Video abzuspielen. Mag sein, daß das das Cubieboard3 auch kann, aber wenn ich sonst nichts brauche, ...
by karlkiste
Thu Oct 31, 2013 2:30 pm
Forum: Deutsch
Topic: Neues Modell?
Replies: 11
Views: 3123

Re: Neues Modell?

Ein komplett neues Modell, aber er schliesst Updates des jetztigen Raspi nicht aus. Frühstens Sep 2015 in der schnelllebigen Elektronikwelt? :lol: Ja, es gibt Updates: Der Speicherchip kommt teilweise nicht mehr von Samsung. Nun gut, wenn dir die Maschine nicht Zeitgemäß erscheint, dann kauf was an...
by karlkiste
Thu Oct 31, 2013 11:02 am
Forum: Deutsch
Topic: Neues Modell?
Replies: 11
Views: 3123

Re: Neues Modell?

Eben Upton, Founder, has stated in public that he would expect a NEW board between two and three years from now (Sept 2013). "Eben Upton, der Gründer, hat (im September 2013) öffentlich erklärt, dass er eine neue Platine in zwei bis drei Jahren erwartete." Na, da würde ich doch ganz konkret reinles...
by karlkiste
Wed Oct 30, 2013 9:03 pm
Forum: Troubleshooting
Topic: USB UART - how to make it working? (FT232RL)
Replies: 11
Views: 15233

Re: USB UART - how to make it working?

When I had this effect, there were several tasks running, reading the serial device. So, sometimes my task got the data, sometimes another task "stole" it.

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