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by dbrb2
Tue Apr 26, 2016 12:47 pm
Forum: General discussion
Topic: The Raspberry Pi 3 Model B Q&A thread
Replies: 457
Views: 210495

Re: The Raspberry Pi 3 Model B Q&A thread

The pads for the u.FL connector seem to be marked by J13 on the PCB?
Would the onboard antennae need to be removed if this is populated...?
by dbrb2
Wed Aug 12, 2015 5:18 pm
Forum: General discussion
Topic: wvdial, USB dongle, and unexpected unplugging...
Replies: 1
Views: 420

wvdial, USB dongle, and unexpected unplugging...

Hi, I have a pi2 with a sierra 3G USB dongle I can successfully connect to the internet using this dongle and wvdial The problem I have is that unplugging the USB dongle whilst it has an active data connection connected hangs the entire pi - no local console, no networking, power cycle required to b...
by dbrb2
Sun Sep 21, 2014 4:15 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: RFID and NFC compatibility
Replies: 1
Views: 732

RFID and NFC compatibility

Hi, I have been using a Mifare RFID reader for a while to control access to our lab It uses a generic Mifare reader from ebay: http://www.ebay.co.uk/itm/13-56MHz-RFID-Read-Write-Module-Kits-With-External-Antenna-Arduino-Compatible-/280663920802 This runs fine from the GPI UART on the pi I have notic...
by dbrb2
Thu Jan 30, 2014 10:42 pm
Forum: Other projects
Topic: Magnetic door lock
Replies: 7
Views: 17053

Re: Magnetic door lock

Hi, It really depends on the reader you have, but in my experience they fall into two main groups: Those that appear as an HID device - a keyboard. Those that appear as a serial port I can see that the "progmac" device you mention is the former - it appears as a keyboard. Those that appear as serial...
by dbrb2
Sat Nov 30, 2013 6:41 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: UART receive buffer?
Replies: 8
Views: 12499

Re: UART receive buffer?

Cheers - that worked It's not the buffer after all. For some reason some cards just don't behave with that reader - though they are the same type as others, and work fine on other readers. Oh well :-) Quick related query: using bash scripting, I can send data to the serial port as suggested above I ...
by dbrb2
Thu Nov 28, 2013 10:42 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: UART receive buffer?
Replies: 8
Views: 12499

Re: UART receive buffer?

I'll check that - if I want to send hex characters to a serial line from the linux command line, what would you suggest?

I have minicom installed, but I can't find a way to tell it to send my data as hex rather than ascii....
by dbrb2
Wed Nov 27, 2013 10:54 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: UART receive buffer?
Replies: 8
Views: 12499

Re: UART receive buffer?

maybe this could be the problem... I've been using this serial class: http://code.google.com/p/php-serial/source/browse/trunk/php_serial.class.php?r=11 And a baud rate of 19200 When I call the serial read function from the above class, it will read until the buffer is empty - but for that there has ...
by dbrb2
Wed Nov 27, 2013 9:59 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: UART receive buffer?
Replies: 8
Views: 12499

UART receive buffer?

Hi, Does anyone know the size of the receive buffer on the raspberry pi UART (/dev/AMA0), and if it is fixed? Interfacing with an RFID sensor board, I send a card read command, the RFID reader replies, then I read the reply from the serial buffer via php - but I seem to be loosing some data for some...
by dbrb2
Mon Nov 04, 2013 4:39 pm
Forum: Troubleshooting
Topic: Compiling omxplayer from source
Replies: 10
Views: 8024

Re: Compiling omxplayer from source

Not so far...
by dbrb2
Tue Oct 29, 2013 6:42 pm
Forum: Troubleshooting
Topic: Compiling omxplayer from source
Replies: 10
Views: 8024

Compiling omxplayer from source

Hi, I wonder if anyone can offer any advice? I am trying to compile omxplayer from source. The active omxproject seems to be here: https://github.com/popcornmix/omxplayer This was prompted by the fact the latest omxplayer binaries I can find are built against ffmpeg 2.0 I managed to get a patch into...
by dbrb2
Sun Aug 18, 2013 10:58 am
Forum: Camera board
Topic: Streaming mjpg from Raspberry Cam
Replies: 221
Views: 183087

Re: Streaming mjpg from Raspberry Cam

Hi, I was wondering if any progress had been made on the "fade to black" issue. I'm using the experimental streamer from here: https://github.com/jacksonliam/mjpg-streamer I have installed the latest firmeware by running rpi-update without errors I am starting the streamer from rc.local at boot with...
by dbrb2
Tue Apr 09, 2013 4:45 pm
Forum: Other projects
Topic: Magnetic door lock
Replies: 7
Views: 17053

Magnetic door lock

Hello, After guiltily watching my raspberryPi gathering dust, I put it to use as an RFID lock controller. It was great fun, and is now in dalily use. It uses a MIFARE reader from ebay, so will work with most transportation / bank / building access cards . Details live here: http://bbarker.co.uk/rfid...
by dbrb2
Sun Mar 31, 2013 1:37 pm
Forum: Troubleshooting
Topic: wpa_supplicant and WPA2 on dhcp
Replies: 9
Views: 22224

Re: wpa_supplicant and WPA2 on dhcp

I /think/ that the answer may be that it makes it easier to list multiple networks to which the pi can conect...but since I can't get it to work at all it is a rather academic advantage!
by dbrb2
Sun Mar 31, 2013 1:26 pm
Forum: Troubleshooting
Topic: wpa_supplicant and WPA2 on dhcp
Replies: 9
Views: 22224

Re: wpa_supplicant and WPA2 on dhcp

Ok - getting somewhere :-) The following interfaces file: auto lo iface lo inet loopback iface eth0 inet dhcp auto wlan0 iface wlan0 inet dhcp wpa-ssid yyyyyyyy wpa-key-mgmt WPA-PSK wpa-group TKIP CCMP wpa-psk xxxxxxxx Works absolutely fine. When running the ifup/down on wlan0 when using the wpa_sup...
by dbrb2
Sun Mar 31, 2013 12:42 pm
Forum: Troubleshooting
Topic: wpa_supplicant and WPA2 on dhcp
Replies: 9
Views: 22224

Re: wpa_supplicant and WPA2 on dhcp

That was my first thought, but doing that had two effects:

1) WPA supplicant error:
wpa_supplicant: wpa-roam can only be used with the "manual" inet METHOD
run-parts: /etc/network/if-pre-up.d/wpasupplicant exited with return code 1

2)Subsequently, DHCP requests made, but no leases returned
by dbrb2
Sun Mar 31, 2013 12:31 pm
Forum: Troubleshooting
Topic: wpa_supplicant and WPA2 on dhcp
Replies: 9
Views: 22224

wpa_supplicant and WPA2 on dhcp

Hello, I have a pi with a ralink wifi dongle that works directly from the pi USB if I use wicf-curses. It is trying to connect to a WPA2 network. [ 2.397260] usb 1-1.2: new high-speed USB device number 4 using dwc_otg [ 2.515375] usb 1-1.2: New USB device found, idVendor=148f, idProduct=5370 [ 2.517...
by dbrb2
Sat Mar 30, 2013 10:53 am
Forum: General discussion
Topic: SD card corruption...?
Replies: 12
Views: 1788

Re: SD card corruption...?

Ah....well that is useful and slightly sad :-)

I wonder what I could have done to it to damage SD cards, but to sort of work in between...I will try a new pi later today. I may also power the pi via the USB if I can find a cable to hack around :-)
by dbrb2
Fri Mar 29, 2013 11:40 pm
Forum: General discussion
Topic: SD card corruption...?
Replies: 12
Views: 1788

Re: SD card corruption...?

The other two were transcend uSD: http://www.maplin.co.uk/4gb-transcend-micro-sdhc-memory-card-509804 All were class 4 cards I have one more PNY card. Currently it mounts fine on my PC. I'm going to try it in a second Pi tommorow before risking it in my own one. Will see how it fares...whilst neithe...
by dbrb2
Fri Mar 29, 2013 5:04 pm
Forum: General discussion
Topic: SD card corruption...?
Replies: 12
Views: 1788

Re: SD card corruption...?

This is a newer board. The 3,3v regulator seems to have survived - at least it is still outputting 3v3, and the 5v line is now stable Rather worryingly, a quick look at dmesg after inserting the SD card into my desktop now gives : [11199.736988] sdc: detected capacity change from 0 to 4027580416 [11...
by dbrb2
Fri Mar 29, 2013 3:55 pm
Forum: General discussion
Topic: SD card corruption...?
Replies: 12
Views: 1788

Re: SD card corruption...?

Hi, * The 5v supply was I think 6v on this pi briefly. Since fixed. The 3.3v regulator still seems to be working, since I can measure a nice 3.3v off the GPIO pin. * I'm using a class 4 SDHC card from PNY * Raspbian image, recently downloaded from the servers, with checksum ok http://www.raspberrypi...
by dbrb2
Fri Mar 29, 2013 3:20 pm
Forum: General discussion
Topic: SD card corruption...?
Replies: 12
Views: 1788

SD card corruption...?

Hello, My pi is being run from a 5v supply into GPIO pins Checked on a scope, steady as a rock For the third time, with three separate SD cards, two of which are on the list of "known good" all is fine after imaging, before file system errors start within a short period of time Whilst the psu is fin...
by dbrb2
Wed Mar 27, 2013 10:57 pm
Forum: General discussion
Topic: problems at boot...
Replies: 3
Views: 642

Re: problems at boot...

Hmmm....

Ok - so re-imaged SD card, reinstalled, all fine....rebooted a few times, then as before random files started to be missing at boot and less and less worked

I'm hoping this is an SD card problem, though it is a new card :-p
by dbrb2
Wed Mar 27, 2013 7:19 pm
Forum: General discussion
Topic: problems at boot...
Replies: 3
Views: 642

Re: problems at boot...

Hi, Yes, I did run the expander at first boot. Could that have caused problems..? df -Bm gives: Filesystem 1M-blocks Used Available Use% Mounted on rootfs 3662M 1537M 1959M 44% / /dev/root 3662M 1537M 1959M 44% / devtmpfs 212M 0M 212M 0% /dev tmpfs 44M 1M 44M 1% /run tmpfs 5M 0M 5M 0% /run/lock tmpf...
by dbrb2
Wed Mar 27, 2013 7:11 pm
Forum: General discussion
Topic: problems at boot...
Replies: 3
Views: 642

problems at boot...

Hi, I installed Raspbian on a Transcend class 4 microSD card last night, installed apache2, mysql, a few other things.... ran apt-get update/upgrade. All seemed fine. Today I find that, whilst the pi boots, and I can ssh into it, it gives continuous warnings of: error while loading shared libraries:...
by dbrb2
Mon Mar 11, 2013 9:39 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO Uart
Replies: 9
Views: 3811

Re: GPIO Uart

Cheers - no I was only using that link to show how to disable the serial console. My device uses 3.3v logic anyway. Still having trouble with stty though....unless I run: stty -F /dev/ttyUSB0 -icanon min 0 time 20 before my script, all serial RX fails (I think the default receive timeout is 0mS) But...

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