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by rpdom
Fri Nov 24, 2017 6:21 am
Forum: Other projects
Topic: Bluetooth Handsfree Car Kit
Replies: 5
Views: 167

Re: Bluetooth Handsfree Car Kit

DougieLawson wrote:
Fri Nov 24, 2017 5:59 am
If it's this Avalon48 https://www.ebay.co.uk/usr/avalon48 then they're about 3,500 miles too far from Lancashire to be of any use to Mr. RDS.
There's an Avalon48 Ltd in Leicestershire (I think) who have a web page that says they do car electrical equipment like handsfree gear. The page is minimal.
by rpdom
Thu Nov 23, 2017 3:58 pm
Forum: Camera board
Topic: Camera control with buttons
Replies: 17
Views: 2531

Re: Camera control with buttons

Yes, that's it.
by rpdom
Thu Nov 23, 2017 3:44 pm
Forum: Troubleshooting
Topic: External hard drive unmounts then remounts.
Replies: 9
Views: 220

Re: External hard drive unmounts then remounts.

epoch1970 wrote:
Thu Nov 23, 2017 2:46 pm
AFAIK specifying max_usb_current changes nothing on Pi 3
After a recent update it does nothing on any Pi B+, 2B or 3B. They default to 1.2A now.
by rpdom
Thu Nov 23, 2017 6:38 am
Forum: Beginners
Topic: sk6812 led light strip / RPI 3 connections
Replies: 2
Views: 70

Re: sk6812 led light strip / RPI 3 connections

The SK6812 is a clone of the WS2812B LED chip. You might have more luck searching for drivers for the WS2812 or WS2811 LEDs. I have some WS2812 strips and they work well from a Pi Zero. I don't use any level converters. I used the rpi_ws281x drivers, which are fairly easy to build and supports Pytho...
by rpdom
Thu Nov 23, 2017 6:23 am
Forum: Add-ons
Topic: Multiple power sources for pi 3 or 0
Replies: 14
Views: 319

Re: Multiple power sources for pi 3 or 0

Yes, you can do this, but you would need to protect the supplies. On the Pi 3B (and most other models) is a circuit called an "Ideal Diode". The Pi Zero doesn't have one of these, but if you built a circuit with two of them on, you could safely use two power feeds. You can connect the power to the P...
by rpdom
Wed Nov 22, 2017 9:02 pm
Forum: Troubleshooting
Topic: Stingy GPU Won't Give Back Memory... (SOLVED!)
Replies: 2
Views: 85

Re: Stingy GPU Won't Give Back Memory...

Can you show your config.txt?

If you have certain options enabled (like the camera) the gpu_mem option may be ignored.
by rpdom
Wed Nov 22, 2017 7:05 pm
Forum: Troubleshooting
Topic: Pi 3 not powering disks
Replies: 3
Views: 110

Re: Pi 3 not powering disks

The Pi 3B has power monitoring and limiting on the USB ports. The Pi 1B does not. (except the early versions with the 140mA polyfuses on each port). However, the Pi 1B has a much lower value polyfuse on the micro USB power input. 700mA iirc, which means 700ma for the Pi and USB ports combined, which...
by rpdom
Wed Nov 22, 2017 4:53 pm
Forum: General discussion
Topic: hdmi to vga restarting problem
Replies: 7
Views: 193

Re: hdmi to vga restarting problem

n67 wrote:
Wed Nov 22, 2017 10:05 am
How does that compare to the Gert VGA board?

(Besides being twice as expensive and requiring an additional (male-male) cable)
Apart from not using up all the GPIO pins, and being plug and play?
by rpdom
Wed Nov 22, 2017 4:31 pm
Forum: Camera board
Topic: Camera control with buttons
Replies: 17
Views: 2531

Re: Camera control with buttons

Hi, It's me "the noob" again with questions. Why are you using a 1K ohm and a 10Kohm resistor for one pushbutton? Is it to make a "pulldown" or a "pullup"? From 3,3v (5v?) via 1K and 10K then to ground, connecting the pushbutton between resistors to GPIO17? 3,3v/5v | 1k | |_______/ __________ GPIO1...
by rpdom
Wed Nov 22, 2017 4:21 pm
Forum: Advanced users
Topic: DPI and HDMi dual screen
Replies: 2
Views: 108

Re: DPI and HDMi dual screen

I've used the VGA666 board with omxplayer at the same time as HDMI. That uses the DPI interface. What you can't do is have a desktop on both displays (yet - the new VC4 driver may be getting there).
by rpdom
Tue Nov 21, 2017 9:48 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: One-Wire devices constantly changing ID's?
Replies: 3
Views: 160

Re: One-Wire devices constantly changing ID's?

When you get sensor IDs starting with 00- it usually means you have a wiring fault. The sensorshaven't been detected properly and you are seeing "ghosts".

Check your wiring.
by rpdom
Tue Nov 21, 2017 7:49 pm
Forum: General discussion
Topic: Raspberry pi 2 Bluetooth
Replies: 3
Views: 137

Re: Raspberry pi 2 Bluetooth

It depends on the dongle. The Pi should recognise most of them without any changes.
by rpdom
Tue Nov 21, 2017 6:25 am
Forum: Troubleshooting
Topic: MIRC on RPi3
Replies: 2
Views: 57

Re: MIRC on RPi3

mIRC is a full featured Internet Relay Chat client for Windows
So it won't work on a Pi*

For IRC you could use xchat

*without using some sort of PC x86 emulator, which will be slow.
by rpdom
Mon Nov 20, 2017 9:38 pm
Forum: Troubleshooting
Topic: Booting Raspberry Zero with Raspberry 3 card
Replies: 2
Views: 71

Re: Booting Raspberry Zero with Raspberry 3 card

How did you copy the contents of the 8GB card to the 64GB card?
by rpdom
Mon Nov 20, 2017 7:58 am
Forum: Beginners
Topic: How to create a custom OS / RASPBERIAN
Replies: 4
Views: 152

Re: How to create a custom OS / RASPBERIAN

These are options to the bsdtar command. --numeric-owner means that the "owner" of each file is stored in the archive as the UID (UserID) number, not the name of the user. --format gnutar means that the archive file will be generated in a specific version of the "tar" format. -cpf something is a com...
by rpdom
Mon Nov 20, 2017 6:00 am
Forum: General discussion
Topic: Add WiFi media store capability to Wireless Access Point VPN Pi
Replies: 5
Views: 192

Re: Add WiFi media store capability to Wireless Access Point VPN Pi

broe23 wrote:
Mon Nov 20, 2017 1:37 am
You cannot use a PATA drive.
Yes you can.
by rpdom
Mon Nov 20, 2017 5:51 am
Forum: General discussion
Topic: Pi3 Model B: Max Number of External Hard Drives
Replies: 3
Views: 123

Re: Pi3 Model B: Max Number of External Hard Drives

That depends on how much current the drives need, but in general I would stick with one drive.
by rpdom
Sun Nov 19, 2017 8:05 am
Forum: Troubleshooting
Topic: Stretch img from pi2 into pi3
Replies: 9
Views: 279

Re: Stretch img from pi2 into pi3

Those versions look good for Raspbian. It's just the NOOBS bits that need updating then. I don't use NOOBS, so I can't remember the exact details, but what you need to do is somehow update the NOOBS boot partition with the new bootcode files. Having said that, it appears I do have a 2015 copy of NOO...
by rpdom
Sun Nov 19, 2017 7:41 am
Forum: Troubleshooting
Topic: Stretch img from pi2 into pi3
Replies: 9
Views: 279

Re: Stretch img from pi2 into pi3

It it is a straight Raspbian image and has been fully upgraded with sudo apt-get dist-upgrade , it should just work. The upgrade should pull in the new kernel and boot files. If it was a NOOBS installation some additional magic stuff needs to be done to update NOOBS as well as Raspbian. What does dp...
by rpdom
Sun Nov 19, 2017 7:19 am
Forum: Advanced users
Topic: Effective bit length of Python on RasPi
Replies: 3
Views: 197

Re: Effective bit length of Python on RasPi

Python 2 will use 32 bit ints, but can handle numbers with much bigger precision.

Python 3 doesn't use the standard types and gives ints unlimited precision.

But basically you don't need to worry about bit length in Python, it will sort itself out for you.
by rpdom
Sat Nov 18, 2017 6:17 pm
Forum: General discussion
Topic: Secure delete/erase SD using encryption
Replies: 11
Views: 402

Re: Secure delete/erase SD using encryption

It has been suggested to overwrite many times. This may or may not eventually hit all those hidden blocks. It won't. Some blocks will have been marked as end of life and will never be used again. It is possible that they still contain the original data. Bottom line is that if the data on there is i...
by rpdom
Sat Nov 18, 2017 5:45 am
Forum: General discussion
Topic: Secure delete/erase SD using encryption
Replies: 11
Views: 402

Re: Secure delete/erase SD using encryption

Using multiple erase passes on an SD card is pointless and can help wear out the card. A single pass is all that is required. The theory with hard disks is that some residual magnetism could be left on the disk after zeroing a block and with the right equipment it is sometimes possible to recover so...
by rpdom
Fri Nov 17, 2017 6:11 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Does DSI have better support
Replies: 10
Views: 357

Re: Does DSI have better support

That would depend on the resolution and how clever the driver is.
(I've no idea, to be honest).
by rpdom
Fri Nov 17, 2017 6:09 am
Forum: General discussion
Topic: Raspberry Pi for commercial use
Replies: 27
Views: 8675

Re: Raspberry Pi for commercial use

Why is the pi zero a dead end ? For a start the restricted supply (one item per person per day at most retailers). Unless you want really large quantities, in which case contact RPT and negotiate a price (it will probably be higher per unit than the retail cost of the single items). Then the fact t...
by rpdom
Fri Nov 17, 2017 5:07 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Does DSI have better support
Replies: 10
Views: 357

Re: Does DSI have better support

That depends on the screen. Most of the small screens that connect to GPIOs use the SPI bus. There are various drivers for those. None of them use the GPU. They often copy the framebuffer to the screen. Some larger screens can use the DPI interface which uses almost all of the GPIOs to give an 18-bi...

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