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by jamesh
Wed Jan 24, 2018 10:04 am
Forum: Beginners
Topic: SD Cards wont work with Pi Zero W [solved]
Replies: 20
Views: 515

Re: SD Cards wont work with Pi Zero W [solved]

Cool. Glad you got it sorted.
by jamesh
Wed Jan 24, 2018 10:04 am
Forum: Automation, sensing and robotics
Topic: 433 mhz transmitter triggering PIR
Replies: 3
Views: 35

Re: 433 mhz transmitter triggering PIR

PIR stands for passive infrared, so detects changes in heat. The heater changes the heat. Hence it fires the sensor. So you need to ensure the PIR doesn't look at the heater, or change the sensor type.
by jamesh
Wed Jan 24, 2018 9:46 am
Forum: General discussion
Topic: GPS receiver
Replies: 1
Views: 31

Re: GPS receiver

You should be able to use your phone fine. The GPS receivers are generally not reliant on being connected to a cell tower, so the GPS should work anywhere.

That said, you can do this with a Pi and a USB GSP dongle, but power supply is usually the issue 'in the wild'.
by jamesh
Tue Jan 23, 2018 7:04 pm
Forum: Beginners
Topic: SD Cards wont work with Pi Zero W [solved]
Replies: 20
Views: 515

Re: SD Cards wont work with Pi Zero W

ramson wrote:
Tue Jan 23, 2018 11:40 am
Thanks issue resolved
Please don't claim issue resolved for other people problems.
by jamesh
Tue Jan 23, 2018 3:40 pm
Forum: Bare metal
Topic: Port xv6 to Raspberry Pi: status update
Replies: 9
Views: 3616

Re: Port xv6 to Raspberry Pi: status update

I think that might win the oldest thread necro in our forum history. I suspect the originally posters are no longer here, so Google might be a good option.

Or you could just read the original post, which has all the links on it to the source code.
by jamesh
Tue Jan 23, 2018 3:25 pm
Forum: Raspberry Pi Desktop for PC and Mac
Topic: Desktop install -. I'm lost
Replies: 9
Views: 66

Re: Desktop install -. I'm lost

OK, for all those people thinking that continually telling everyone that Pixel desktop is dead etc makes less works for the mods, NO IT DOESNT. It just makes threads longer and harder to maintain. I've just had to spend a load of time I don't have cleaning up this thread and unbanning (sorry) So, th...
by jamesh
Tue Jan 23, 2018 1:47 pm
Forum: General discussion
Topic: Next Gen Raspberry: Joint venture?
Replies: 17
Views: 527

Re: Next Gen Raspberry: Joint venture?

Obviously we want to continue in business, which means using good business sense. Obviously we want to be the best, which means investing in future product. As with someone like Google, if you get too good at what you do, everyone uses you, leading to de-facto monopoly issues. Could it happen to us?...
by jamesh
Tue Jan 23, 2018 1:29 pm
Forum: Beginners
Topic: SD Cards wont work with Pi Zero W [solved]
Replies: 20
Views: 515

Re: SD Cards wont work with Pi Zero W

ramson wrote:
Tue Jan 23, 2018 11:40 am
Thanks issue resolved
What was it?
by jamesh
Tue Jan 23, 2018 11:24 am
Forum: General discussion
Topic: Next Gen Raspberry: Joint venture?
Replies: 17
Views: 527

Re: Next Gen Raspberry: Joint venture?

Libre Computer We believe that the Raspberry Pi Foundation is making a play with Broadcom to take a controlling stake of the future computing market. Interesting 'conspiracy theory'. I am not sure I find it particularly worrisome even if it were the case. Not true anyway. And as you say, why would ...
by jamesh
Tue Jan 23, 2018 10:44 am
Forum: General discussion
Topic: Next Gen Raspberry: Joint venture?
Replies: 17
Views: 527

Re: Next Gen Raspberry: Joint venture?

No, I don't think so. We have a roadmap for the next 5+ years, and the money and team to implement it. I don't think these guys (or indeed any of the other SBC people) would be able to contribute anything more than we are already doing. EDIT. Surprised you are having problems with USB, whilst there ...
by jamesh
Tue Jan 23, 2018 10:40 am
Forum: Troubleshooting
Topic: Directory listing Vulnerability at http://downloads.raspberrypi.org/weather_station/images/
Replies: 3
Views: 92

Re: Directory listing Vulnerability at http://downloads.raspberrypi.org/weather_station/images/

That's our thoughts at the moment, but I have passed this on to the webteam for fuller consideration.
by jamesh
Tue Jan 23, 2018 9:36 am
Forum: Beginners
Topic: SD Cards wont work with Pi Zero W [solved]
Replies: 20
Views: 515

Re: SD Cards wont work with Pi Zero W

I am now trying to use etcher to burn the downloaded zip file of stretch lite, but after about 10% I get an error. I haven't tried just using the zip file without extracting before, so I was hoping it would work. "invalid literal/length code at Zlib._handle.onerror (zlib.js:355:17)" Defect/corrupti...
by jamesh
Mon Jan 22, 2018 4:31 pm
Forum: General discussion
Topic: Arcade Monitor - Rotated display NOW Jumpy Graphics
Replies: 2
Views: 78

Re: Arcade Monitor - Rotated display NOW Jumpy Graphics

Not sure if it has made it in to the latest firmware yet, but I have added an extra config.txt option which should help with this. extra_transpose_buffer=1 will create an extra buffer used in the transpose which should help with tearing of the image when rotated. However, a transpose is an expensive...
by jamesh
Mon Jan 22, 2018 3:34 pm
Forum: Camera board
Topic: raspberry pi camera long exposure
Replies: 11
Views: 331

Re: raspberry pi camera long exposure

Radu79 wrote:
Mon Jan 22, 2018 1:08 pm
Is the 6 seconds a hardware limit?
I believe so, we cannot make some values big enough to get any more exposure time.
by jamesh
Mon Jan 22, 2018 3:32 pm
Forum: Camera board
Topic: Mode 1 video processing & size rounding
Replies: 7
Views: 179

Re: Mode 1 video processing & size rounding

It's not scaled. The ISP requires frames that are multiple of 16 in X and 32 in Y (I think that is the right way round) so 1080 is rounded up to 1088. The extra lines are added, IIRC by making the sensor area slightly larger (might be wrong there), not by scaled up the 1080. No, wrong way around. s...
by jamesh
Mon Jan 22, 2018 1:06 pm
Forum: Camera board
Topic: raspberry pi camera long exposure
Replies: 11
Views: 331

Re: raspberry pi camera long exposure

The max exposure time of the Pi camera is 6s I am afraid.
by jamesh
Mon Jan 22, 2018 1:05 pm
Forum: For sale
Topic: Raspberry pi - down from £353 to a staggering £33 + £10 shipping
Replies: 7
Views: 355

Re: Raspberry pi - down from £353 to a staggering £33 + £10 shipping

I would hope that anyone with an ounce of common sense would google for Pi prices before buying. Maybe common sense isn't that common.
by jamesh
Mon Jan 22, 2018 12:35 pm
Forum: Camera board
Topic: Mode 1 video processing & size rounding
Replies: 7
Views: 179

Re: Mode 1 video processing & size rounding

It's not scaled. The ISP requires frames that are multiple of 16 in X and 32 in Y (I think that is the right way round) so 1080 is rounded up to 1088. The extra lines are added, IIRC by making the sensor area slightly larger (might be wrong there), not by scaled up the 1080.
by jamesh
Mon Jan 22, 2018 12:31 pm
Forum: General discussion
Topic: GPU-driver
Replies: 3
Views: 186

Re: GPU-driver

You can enable and disable it using raspi-config I believe. As what is and isn't working, try it and see!
by jamesh
Mon Jan 22, 2018 12:29 pm
Forum: Beginners
Topic: Please Help - Need Assembler for Pi 3b on Mac OS X
Replies: 17
Views: 423

Re: Please Help - Need Assembler for Pi 3b on Mac OS X

Editor and compiler/assembler are already build in to the Raspbian distro, some basic file handling commands are useful, as is knowing how to install new packages. That's about it to get you going. Everything else you will learn by osmosis.
by jamesh
Mon Jan 22, 2018 11:09 am
Forum: General discussion
Topic: Broadcom BCM2835 Power Saving
Replies: 40
Views: 1229

Re: Broadcom BCM2835 Power Saving

Digging back into my memory, I seem to recall that underclocking the ARM's doesn't save a lot of power. But I am not sure if there was any real testing done on it.
by jamesh
Mon Jan 22, 2018 10:25 am
Forum: Camera board
Topic: Raspistill parameter Question
Replies: 4
Views: 108

Re: Raspistill parameter Question

You could try just using the luminance channel of a YUV image (ie Y). Luminance is less likely to change like this.

IIRC, motion detection usually uses just the Y channel. For example, in H264 encoding, it uses the Y channel to work out similar blocks.

See raspistillyuv for details.
by jamesh
Mon Jan 22, 2018 10:14 am
Forum: Beginners
Topic: Please Help - Need Assembler for Pi 3b on Mac OS X
Replies: 17
Views: 423

Re: Please Help - Need Assembler for Pi 3b on Mac OS X

It seems extremely unrealistic to me that one could learn Linux in half a day, because I know I've spent at least an entire day trying to mount a RAID array and wasn't able to do so. You can learn enough Linux for what you want to do in half a day. But as others have said, Linux is predominant in e...
by jamesh
Mon Jan 22, 2018 10:01 am
Forum: Troubleshooting
Topic: Running software kills wifi-driver( brcmfmac ) on Rpi3
Replies: 4
Views: 217

Re: Running software kills wifi-driver( brcmfmac ) on Rpi3

In case someone is interested. The issue in my case was caused by the MDNS bug reported by google in their android devices, causing instabilities in WiFi networks: https://support.google.com/googlehome/answer/7634752?hl=en&ref_topic=7071995 I tried to disable avahi mDNS service in my rpi3, but didn...
by jamesh
Mon Jan 22, 2018 10:00 am
Forum: Advanced users
Topic: Raspistill taking too long
Replies: 5
Views: 156

Re: Raspistill taking too long

Well, I found out that by default there was a 5 seconds delay, just because. I am not sure who thought it would be a good idea to add that as a default option. Anyway, to disable it, just add --timeout 1 and the delay is gone. In addition to 6by9 comment, a timeout of about 1000 (1s) is usually eno...

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