Raspberry Pi Forums

gregeric

New B+, vcgencmd read_ring_osc gives 3.086MHz @1.2V Crude overclocking effort: raspi-config's default turbo mode, all OK at 1000MHz. Manually editing /boot/config.txt, found stable limit at arm_freq=1150 That's with raspi-config's default turbo overclock settings unchanged ie core_freq=500 sdram_fre...

gregeric

I have PCTV Nanostick T2 (model 290e) working with DVB-C on raspbian. With latest kernels, you have to switch the frontend from the default DVBT. This will apply to people wanting to test the T220 also. To do this: sudo apt-get install dvb-tools List what modes are supported with: dvb-fe-tool change...

gregeric

All fine with the Raspbian partition of a previous NOOBS microSD, but the NOOBS software itself appears not to have drivers for the upgraded USB hub/ethernet IC, as I cannot select OS's from the NOOBS menu. Which version of NOOBS was that? What do you mean by "cannot select OS's" - the keyboard (or...

gregeric

New B+ is much neater and prettier. There's an obvious increase in engineering thought, time & money gone in to revising it. It's lovely!. All fine with the Raspbian partition of a previous NOOBS microSD, but the NOOBS software itself appears not to have drivers for the upgraded USB hub/ethernet IC,...

gregeric

According to Gert's doc http://www.scribd.com/doc/101830961/GPIO-Pads-Control2, after reset the GPIO's have a default drive strength of 8mA. @ Burngate - does that imply we should use a minimum 3V3/8mA ie ~400R between GPIO & MOSFET gate? Or can we get away with less, as this is a transient, far fro...

gregeric

OK, just added a second 5m 5630 all-white LED-strip in parallel. With one IRL2203 hexfet MOSFET, driven directly from 3V3 logic, and 13V on the LED anodes, the measured current is 5.5A at 100% duty cycle. So a ~70W load controlled. No heatsink was used, but adding the second strip/doubling the load ...

gregeric

Thanks, but that is for 5 meters? How can i connect 4 strips for powering 20meters of RGB strip? Yes, that's one 5m strip. There is some dimming in brightness at the far end of the strip which can be eliminated by feeding 12V to both ends, like a ring main. I missed out on your requirement for 20m ...

gregeric

I've been driving LED strips off 3V3 PWM logic using the IRL2203 MOSFET alone. That's with high brightness 12V white 5630 strips at ~3A. The mosfet is fully turned on with 3V logic, has Rds ~7 mOhm, and thus runs cold. You'll need one of those per R/G/B and no other components.

gregeric

Might be worth trying out a Model A Pi, & as jbeale suggested, hang a USB-ethernet converter at the other end of a long USB cable. There's one less chip on the A (the ethernet+USB hub) exposed to the strong magnetic field & any possible issues with it too.

gregeric

Suffered the same misfortune with my gertboard; dead BD6222 H-bridge & Pi. I was using ~18V on MOT+, which only afterwards I discovered is the max that device is rated at. Pi has same symptoms as the OP's: does nowt, soc gets v hot. Resumed playing with the Gertboard on another Pi, this time using a...

gregeric

Hi James - built it OK, and can see new -qp option in help splash as confirmation all OK. Native compile wasn't too painful using the method here followed by ./buildme First off I tested indoors, but it seems the noise level keeps the encoder busy, there's not much evidence of the needed bitrate dro...

gregeric

Rather than modify the kernel, might it be possible to change the device id of the FTDI device to a recognised value? Look up MPROG & FT_PROG on the FTDI website.

gregeric

Hi James & thanks for your continued efforts to refine the camera apps.

Is there no way of knowing when the camera module has stabilised wrt exposure eg polling some agc value or such?

gregeric

Glad you got that sorted James, more speed to your development. Would be an interesting use-case of the PiNoir camera - point it at the problem & see where the power losses are!

gregeric

http://www.raspberrypi.org/phpBB3/viewt ... 43&t=32605

gregeric

sudo apt-get install setserial

setserial /dev/ttyUSB0 baud_base 3000000 divisor 192 spd_cust

Now, whenever you set the serial baud rate to 38400,the custom baud rate of 3000000/192=15625 will be substituted.

gregeric

Yes, this is for vanilla motion from the raspbian repository. A USB webcam is used solely for low res / low cpu motion detection, and Pi Camera Board for hi-res h264 recording.

Are you using dozencrow's motion-mmal?

gregeric

http://www.youtube.com/watch?v=zCxTTrTZSSM

Maybe you can play with the Pi's hdmi cec options in config.txt to mimic a droid phone & overcome this problem? Just a hunch.

gregeric

Apparently the Lapdock 500 fails to work with anything but the intended Motorola devices; unlike the Atrix Lapdock it cannot be used as an HDMI monitor for the rPi. Or so user robpol86 has reported here on this forum and on his blog.

gregeric

Seems I am seeing a similar issue as per this thread:
http://www.raspberrypi.org/phpBB3/viewt ... ad#p356299

I've dropped the overclock to 800, removed the small overvolt & for good measure set current_override_override=0x5A000020 for good measure.

All seems OK now

gregeric

In order to achieve 1080p recordings of events, I thought I'd try triggering GPU accelerated capture/compression by using motion's on_event_start option. I've been using motion successfully with an external IP camera. So to modify that setup, firstly I turned off native/arm mpeg movie creation in /e...

gregeric

Take a picture! Then compare that image with video footage of the same scene: a still with the latest fixes has a wider field of view than the video; with the original software, it had a narrower field of view.

gregeric

OK, can see what I need to do - but the SD card I'm using is only 2GB! So can't test the fix. Doh! Will do it tomorrow. (For those interested, -D_FILE_OFFSET_BITS=64 is required in flags supplied to gcc). I've come across this issue before; you may also need -D_LARGEFILE_SOURCE and -D_LARGEFILE64_S...

gregeric

Hey Jim - forget this Pi pi stuff for now. I think I get the Chesapeake reference & your designed irony. That ship's timbers now rest on these shores - there's even a pub not too far away from me here in northern England whose name reminds us of the acquiring of that vessel & its timbers by HMS Shan...

gregeric

You'll likely need a crossover ethernet cable for direct laptop-Pi connection, unless the laptop ethernet port can manage auto-X.

Search found 1506 matches

Re: Determining how fast your Pi really is

Re: Geniatech DVB-T2 Stick T220 for Raspbian

Re: Who's got their hands on a B+ so far?

Re: Who's got their hands on a B+ so far?

Re: Raspberry Pi RGB Led Strip Analoge

Re: Raspberry Pi RGB Led Strip Analoge

Re: Raspberry Pi RGB Led Strip Analoge

Re: Raspberry Pi RGB Led Strip Analoge

Re: Pi in high magnetic fields

Re: Fried Gertboard and pi :-(

Re: Variable bitrate with raspivid?

Re: Recompiling FTDI drivers

Re: New version of Raspistill

Re: A Power(less) story

Re: Sensor Used in the Camera Module

Re: changing baud rate on USB-Serial adapter

Re: Motion: on_event_start raspivid

Re: problems setting raspberry pi up with lapdock 500

Re: problems setting raspberry pi up with lapdock 500

Re: Motion: on_event_start raspivid

Motion: on_event_start raspivid

Re: Foundation Camera Board information

Re: file size limit on raspivid ?

Re: Something the Pi is not good at - calculating Pi

Re: Can only connect to raspberry pi through router, not dir