Raspberry Pi Forums

knute

I can think of a lot of ways to do this but off the top of my head, I would say run your configuration program as a desktop entry and once the user enters the applicable data, write a message to a file that says it has been set or erase the desktop entry or? You could have another icon on the deskto...

knute

The simplest way is to use the dht11 overlay. You just read the data out of a file. It works fine. Thanks for the reply knute, Do you have some instructions you could link me to for using the dht11 overlay? Thank you :) Turn off your pi and disconnect the power. Connect the + lead of your DHT senso...

knute

That sounds like a fun project. Before you actually code it, you should decide exactly how the game and the players are going to interact. Then you can decide on what messages you need to pass between the clients and the server. So big picture I can see the first player logs into the server and he b...

knute

The simplest way is to use the dht11 overlay. You just read the data out of a file. It works fine.

knute

Your MidiTest code works fine on my RaspberryPi. I tested it with Oracle Java 8, OpenJDK 8 and OpenJDK 11. I am sending my audio through the HDMI port so maybe your problem is with the headphone jack or directing the audio there. If you are using OpenJDK 8 from the repository you need to modify the ...

knute

Just so I'm sure I understand your setup, you've got two computers, a Pi and Windows PC on a LAN. Both connect to the Linux box's network via VPN but only the Windows PC can ssh into the Linux box? Or are you using the LAN's router to VPN to the Linux box's network? So I would turn on the VPN on the...

knute

Is the Windows PC on 192.168.1.? or a different subnet completely from the Pi's VPN network? If it is then maybe the 'firewall' (whatever that is) is rejecting addresses from 192.168.1.*.

knute

You don't need sudo. Can you ping the firewall at that address? Do you really need to log in as root?

knute

Did you have any success with this? I am able to get mp3 files to play. I am running this on Raspbian stretch lite (11/13/2018 release) java version "1.8.0_65" Java(TM) SE Runtime Environment (build 1.8.0_65-b17) Java HotSpot(TM) Client VM (build 25.65-b01, mixed mode) I overlayed this with: armv6h...

knute

******************************************************************* I seem to have solved this by downloading the userland code and compiling it. The version of raspistill now is 2e2899cc6f3c. ******************************************************************* I'm having an odd problem with raspisti...

knute

pi at knutejohnson dot com

knute

So I got it sort of working by using Alexi Shipilev's openjdk11, https://builds.shipilev.net/openjdk-jdk11/, for arm build and adding a command line switch from a Oracle document, https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/java2dpipeline004.html, and disabling the use of the...

knute

public class test { private String[][] table; public test() { table = new String[][] {{"ID","NAME"}, {"101","Max"}, {"102","Mark"}}; } public static void main(String... args) { test test = new test(); for (int i=0; i<test.table.length; i++) { for (int j=0; j<test.table[0].length; j++) { System.out....

knute

I think you are going to have all sorts of issues if you attempt to run the desktop as root. I would start the Java program with sudo in a desktop file.

knute

Might be helpful to include your java code. Code shouldn't make any difference but here is what I usually use to test whether the OpenGL pipeline is actually working. import java.awt.*; import java.awt.event.*; import java.lang.reflect.*; import javax.swing.*; /** * Demonstrates a method to do fast...

knute

Anybody know how or if it is even possible to get Java to use the OpenGL pipeline? I'm running current up to date raspbian with the OpenGL desktop driver enabled. Java is latest openjdk version 8. [email protected]:~ $ java -version openjdk version "1.8.0_181" OpenJDK Runtime Environment (build 1.8...

knute

Code: Select all

$ gcc -lm -lrt -lwiringPi -lwiringPiDev -l libsystemd-dev -pthread -o prog prog.c
/usr/bin/ld: cannot find -llibsystemd-dev

I think you have too many 'l's here.

knute

I had gotten a low voltage warning a while back and it got me to thinking about power supplies and cables. So I bought some cables that were advertised as lower resistance and I had a few already that I could try out. I tested six cables all with the same power supply and five power supplies without...

knute

I just solved my problem playing sound by editing the /etc/java-8-openjdk/sound.properties file according to this post: https://nealvs.wordpress.com/2017/08/11/java-sound-on-a-raspberry-pi-with-openjdk/ It says to comment out the icedtea pulseaudio properties and go back to the com.sun.media.sound p...

knute

I don't know what's going on with FX. I just tried to run a JavaSound program and it doesn't work either. I get LineUnavailableExceptions. Not sure what is going on, I thought this worked just fine before. Try the short program below on a wave file and see if that plays. I tried putting Oracle's Jav...

knute

I haven't done much with FX on the Pi because it didn't work very well for quite a while. I know you can use Aleksy Shipilev's (https://builds.shipilev.net/openjdk-jdk11/) arm build of openJDK11 and gluon's JavaFX 11 early access for the arm. I don't know what repo has 11, when I look I just see ope...

knute

Thanks for all the information. I got the sensor and plugged it in and it creates the /dev/ttyUSB0 device. I even got their SDK to compile and run some test programs on the Pi.

Thanks again for all the help.

knute

An update on my previous post. This worked great for graphics, but was crashing with a SEGFAULT when trying to play a media clip. Based on another post, I forced a reinstall and that seems to have fixed it. sudo apt-get install --reinstall -y openjdk-8-jre-headless openjdk-8-jre openjfx It does see...

knute

Thanks everybody for all the information. I'm supposed to have the sensor next week to play with. I'm sure I will have more question later.

Thanks!

knute

casete wrote: ↑
Sat Jan 19, 2019 4:04 pm
I'd be really interested to know what I would need to do to get my Pi set up properly with OpenJFX. Looking forward to hearing more!

If you are using openjdk8 then just: sudo apt install openjfx

that's it.

Search found 473 matches

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raspistill problem - solved!

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Cable and power supply tests

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Re: Desktop indicators bleed through JavaFX