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by EULERPI
Sun May 27, 2018 5:12 am
Forum: General discussion
Topic: Model train project help
Replies: 14
Views: 2186

Re: Model train project help

If all you want is the functionality rather than the challenge of writing code yourself then there is JMRI. I think it stands for Java Model Railway Interface. The Java is what the program suite is written in. There is the potential to extend the suite if needs be using Jython scripts - which I've ...
by EULERPI
Wed May 23, 2018 3:07 pm
Forum: Beginners
Topic: Arduino Uno + Raspberry Pi3
Replies: 2
Views: 314

Re: Arduino Uno + Raspberry Pi3

Hi, Maybe not better in all cases but possibly easier as Arduino USB output can be connected into a P3 3 USB port. If you have access to Chinese Arduino Nano clones they can be ordered from the UK from £1.50 including postage. I've got one talking to a sensor and sending the data serially to a Raspb...
by EULERPI
Sat May 12, 2018 6:10 am
Forum: General discussion
Topic: Model train project help
Replies: 14
Views: 2186

Re: Model train project help

If all you want is the functionality rather than the challenge of writing code yourself then there is JMRI. I think it stands for Java Model Railway Interface. The Java is what the program suite is written in. There is the potential to extend the suite if needs be using Jython scripts - which I've f...
by EULERPI
Tue Mar 14, 2017 9:15 am
Forum: C/C++
Topic: How to use 100 percent of the raspberry pi cpu in C programs
Replies: 7
Views: 2724

Re: How to use 100 percent of the raspberry pi cpu in C prog

Hi, I echo LdB's guidance and would just add that once you've worked out whether the programme can go any faster (profiling) you can look at 'multiprocessing'. Assuming your Pi has four cores and your program is capable of being split into parallel tasks then you can use threading in C. There may be...
by EULERPI
Mon Mar 06, 2017 11:37 am
Forum: Raspberry Pi OS
Topic: Can't connect microsoft 3600 bluetooth mouse
Replies: 19
Views: 9416

Re: Can't connect microsoft 3600 bluetooth mouse

Thanks,

I think I'll try the instructions on a spare micro SD card of the latest Raspbian Jessie.

Maybe the experimental version of Bluez will fix the problem of choppy Bluetooth audio output when wifi is enabled.

Regards

Nick
by EULERPI
Mon Mar 06, 2017 9:30 am
Forum: General discussion
Topic: Looking for a Bluetooth keyboard for my Pi 3B
Replies: 7
Views: 4766

Re: Looking for a Bluetooth keyboard for my Pi 3B

Hi, I'm using a Kensington KP400 Bluetooth/USB switchable keyboard with Raspberry PI 3Bs and Pi Zero W. Its full size but doesn't have a touchpad. I haven't had any problems using the Bluetooth Keyboard and Wifi at the same time - only with Bluetooth Audio out at the same time as Wifi (on the Pi 3B ...
by EULERPI
Sat Mar 04, 2017 4:05 pm
Forum: Other projects
Topic: Fix for problem with Mini HDMI adapter in Pi Zero case
Replies: 4
Views: 3439

Fix for problem with Mini HDMI adapter in Pi Zero case

Hi, I found that with the new Official Pi Zero case the HDMI to mini HDMI adapters wouldn't reliably stay plugged into the Pi Zero W. The adapters are from the Pi Hut UK and Pimoroni UK. I looked at a copy of the HDMI mechanical specification and the length of the Mini HDMI plug body does not seem t...
by EULERPI
Sat Mar 04, 2017 11:16 am
Forum: Troubleshooting
Topic: Stuttering Bluetooth Audio output when Wifi is on
Replies: 1
Views: 937

Stuttering Bluetooth Audio output when Wifi is on

Hi, While trying out the new Pi Zero W Raspbian Bluetooth Audio output I noticed the Audio was very choppy unless the Wifi was disabled with sudo ifconfig wlan down. I think I read that this is also a feature of the Pi 3B built in Wifi/Bluetooth. Does anyone know of a fix for Raspbian/Pixel or if th...
by EULERPI
Sun Feb 26, 2017 7:35 pm
Forum: General discussion
Topic: Low cost USB to Ethernet adapters
Replies: 3
Views: 1679

Re: Low cost USB to Ethernet adapters

Many thanks for your info.

With your info I can dig deeper.

Regards

Nick
by EULERPI
Sun Feb 26, 2017 12:00 pm
Forum: General discussion
Topic: Low cost USB to Ethernet adapters
Replies: 3
Views: 1679

Low cost USB to Ethernet adapters

Hi, I'm working on a computer vision system for model railway train position detection (hidden sidings only) and I'm looking into an alternative set up using Pi Zeros and cameras to do a little initial image processing and passing the reduced data to a central computer. Has anyone have experience of...
by EULERPI
Sat Feb 25, 2017 10:11 am
Forum: Beginners
Topic: Communication between Raspberry pi and Arduino
Replies: 4
Views: 2485

Re: Communication between Raspberry pi and Arduino

Hi, On the Arduino you could attached a bit of text in front of the sensor data to identify which sensor it is. You could for example use a capital A for the first sensor through to E for the sixth sensor or you could give them unique names. Then on the Raspberry Pi write a bit of code to separate o...
by EULERPI
Sun Feb 12, 2017 5:31 pm
Forum: Camera board
Topic: Raspberry Pi Camera V2 Video Module as QR Code Scanner
Replies: 2
Views: 1228

Re: Raspberry Pi Camera V2 Video Module as QR Code Scanner

Hi, I don't see why not providing the QR codes are not moved in front of the camera too fast (I was thinking of a conveyor belt). There seems to be at least one open source Python 'library' that is said to read QR codes (but I haven't tried one myself). The picamera (Python) 'library' can read still...
by EULERPI
Thu Feb 09, 2017 4:14 pm
Forum: Off topic discussion
Topic: Asus Tinker board
Replies: 155
Views: 21252

Re: Asus Tinker board

Hi

The ASUS Tinker board may have been withdrawn from sale at least from CPC uk:

https://www.techgig.com/tech-news/edito ... Sale-91249

Regards

Nik
by EULERPI
Tue Feb 07, 2017 9:46 am
Forum: Camera board
Topic: V3 camera in the works?
Replies: 54
Views: 17709

Re: V3 camera in the works?

[quote="Gavinmc42" I would like to use the Zero as Cameras that do some preprocessing. If used as USB gadgets 4 x Zero could plug into one Pi 2/3, then each core could do the cv stuff per camera. This sort of speed is only really needed on drones etc. [/quote] Hi, Sorry I thought the farm was large ...
by EULERPI
Mon Feb 06, 2017 12:09 pm
Forum: Camera board
Topic: V3 camera in the works?
Replies: 54
Views: 17709

Re: V3 camera in the works?

Rpf now has enough people to do work on the camera system, Yippee, that means the cameras won't be orphans. Can we expect more family members? There are some effects filter options that would be nice to have the VC4 to do. NDVI and ENDVI using the NOIR cameras with blue and red filters. http://www....
by EULERPI
Sun Feb 05, 2017 4:27 pm
Forum: Java
Topic: Multithreading CPU usage
Replies: 10
Views: 4094

Re: Multithreading CPU usage

Hi, Glad to be of help. Your question prompted me to learn how to prepare and run a Java program. I moved the system.out.println to outside the for loop and made the for loops longer using long integer types and values and got all CPUs reported as 100% in htop. It also sent the SoC temperature of th...
by EULERPI
Sat Feb 04, 2017 1:36 pm
Forum: Java
Topic: Multithreading CPU usage
Replies: 10
Views: 4094

Re: Multithreading CPU usage

Hi, I think that's because your program does lots of Output operations which causes the program to 'pause' and report back to the O/S that it can't continue execution until the next part of the Output operation is complete. I'm guessing here but making your Java program run four times (instances) at...
by EULERPI
Sat Feb 04, 2017 12:56 pm
Forum: Java
Topic: Multithreading CPU usage
Replies: 10
Views: 4094

Re: Multithreading CPU usage

Hi, I think that on modern operating systems when a program asks the CPU to do many forms of Input/Output (things that take a lot longer than the CPU takes to execute an instruction) one of the things the program/ O/S (under the bonnet) does is to report the CPU as not being active doing that thread...
by EULERPI
Thu Feb 02, 2017 11:47 pm
Forum: General discussion
Topic: Raspberry PI 3 Bluetooth Declaration costs
Replies: 28
Views: 8884

Re: Raspberry PI 3 Bluetooth Declaration costs

How many people are aware that creating a device intended for commercial use that incorporates a Raspberry PI 3 means you are supposed to pay the $8,000 declaration fee to the Bluetooth SIG? https://www.bluetooth.com/develop-with-bluetooth/qualification-listing/do-i-need-to-list-qualify-my-product ...
by EULERPI
Tue Jan 31, 2017 6:00 pm
Forum: General discussion
Topic: Raspberry PI 3 Bluetooth Declaration costs
Replies: 28
Views: 8884

Re: Raspberry PI 3 Bluetooth Declaration costs

Hi, Any commercial lawyers out there willing to give a free opinion on this topics problem?. If a commercial product* is incorporated into another product in a way the original manufacturer would reasonably expect does the technical branding of that product (eg the Bluetooth logo) by default extend ...
by EULERPI
Tue Jan 31, 2017 5:24 pm
Forum: Automation, sensing and robotics
Topic: Reading Vaccum
Replies: 7
Views: 2260

Re: Reading Vaccum

Hi, There are various vacuum gauges (with electrical outputs) for measuring vacuum pressures. Some are better at covering a certain ranges of pressures than others. Most have disadvantages that must be taken into account when adding them to a design. Penning and Pirani gauges come to mind as vacuum ...
by EULERPI
Sat Jan 14, 2017 4:34 pm
Forum: Raspberry Pi OS
Topic: Can't connect microsoft 3600 bluetooth mouse
Replies: 19
Views: 9416

Re: Can't connect microsoft 3600 bluetooth mouse

What is the make and model of the mouse? Is it a BLE (Smart Bluetooth) device? [EDIT: Sorry, I see it is a BLE device. These types of mice will not work on a Raspberry Pi.] The raspberry pi.org website https://www.raspberrypi.org/products/raspberry-pi-3-model-b/ says the Pi 3 B has "Bluetooth 4.1 a...
by EULERPI
Sat Jan 14, 2017 3:52 pm
Forum: Other projects
Topic: Portable Camera Project?
Replies: 7
Views: 1807

Re: Portable Camera Project?

thanks for the info about witty pi i had not heard of it since i only want to power on once or twice every 24 hours for only a few minutes at a time, if i got a big enough battery, couldnt that last for 30 days since the total usage time would be lets say 5 minutes per day * 30 days = 150 minutes a...
by EULERPI
Sat Jan 14, 2017 3:41 pm
Forum: Raspberry Pi OS
Topic: Can't connect microsoft 3600 bluetooth mouse
Replies: 19
Views: 9416

Re: Can't connect microsoft 3600 bluetooth mouse

What is the make and model of the mouse? Is it a BLE (Smart Bluetooth) device? [EDIT: Sorry, I see it is a BLE device. These types of mice will not work on a Raspberry Pi.] The raspberry pi.org website https://www.raspberrypi.org/products/raspberry-pi-3-model-b/ says the Pi 3 B has "Bluetooth 4.1 a...
by EULERPI
Sun Nov 06, 2016 5:44 pm
Forum: Advanced users
Topic: Enable a Bluetooth Speaker on startup (latest Raspbian)
Replies: 8
Views: 3271

Re: Enable a Bluetooth Speaker on startup (latest Raspbian)

Is there a way to control selecting a Bluetooth speaker normally selected from the Raspbian Audio part of the Taskbar using a script?. That should enable me to connect to a Bluetooth speaker automatically (I'd like to use the spare capacity of a Pi3 without keyboard/mouse being used for Model Railwa...

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