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by Richard-TX
Mon Jan 06, 2014 1:59 pm
Forum: Troubleshooting
Topic: Connecting to internet via cable and router
Replies: 7
Views: 1394

Re: Connecting to internet via cable and router

Try forcing the Pi to use 10Mbit. Also try half duplex.

http://www.raspberrypi.org/phpBB3/viewt ... 66&t=45788
by Richard-TX
Mon Jan 06, 2014 7:05 am
Forum: Beginners
Topic: Extreme Beginner -- Many Questions
Replies: 4
Views: 1069

Re: Extreme Beginner -- Many Questions

Forget c#. c# is sort of like Java but with reliability, productivity and security deleted.

http://www.tiobe.com/index.php/content/ ... index.html
by Richard-TX
Sun Jan 05, 2014 10:51 pm
Forum: Staffroom, classroom and projects
Topic: what use is mathematica for raspi
Replies: 23
Views: 9571

Re: what use is mathematica for raspi

I have no idea why mathmatica is bundled with the latest Raspian image. I consider wolfram and oracle a huge waste of 588 MB.

I execute a apt-get purge wolfram-engine on every new raspian install.
by Richard-TX
Sun Jan 05, 2014 9:15 pm
Forum: Troubleshooting
Topic: Pi is getting too Hot and not turning on now
Replies: 6
Views: 1141

Re: Pi is getting too Hot and not turning on now

power supply has lost it's regulation?
by Richard-TX
Sun Jan 05, 2014 4:48 pm
Forum: Beginners
Topic: Silly permission issue
Replies: 8
Views: 1497

Re: Silly permission issue

Be aware that adding the ntpdate package will slow down boot time. At boot time ntpdate goes out and gets the time from a server and it can take a while. The startup script /etc/init.d/ntp checks for the presence of ntpdate and uses it if is installed.
by Richard-TX
Sun Jan 05, 2014 2:01 pm
Forum: General discussion
Topic: Network cable maximum length - RJ45
Replies: 19
Views: 4300

Re: Network cable maximum length - RJ45

The 100 m spec is guaranteed. Longer length cables have been used successfully but if it doesn't work for you, you are on your own.
by Richard-TX
Sun Jan 05, 2014 1:53 pm
Forum: Troubleshooting
Topic: Rasp Pi A Model help
Replies: 13
Views: 1736

Re: Rasp Pi A Model help

I have had excellent luck with the D-Link powered USB hubs. They have enough current to power the Rpi and are very reliable. It is the only brand that I buy. Cost is about $25 from Amazon.
by Richard-TX
Sun Jan 05, 2014 4:16 am
Forum: Python
Topic: Simple gpio alarm script
Replies: 4
Views: 3172

Re: Simple gpio alarm script

python, unlike many languages, requires indents in certain places.

while and for loops must be indented.
by Richard-TX
Sat Jan 04, 2014 8:23 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Python I2C interface to temp/humidity sensor
Replies: 3
Views: 13056

Re: Python I2C interface to temp/humidity sensor

What happens when you run the command[b][i] i2cdetect -y 1[/i][/b]

Does the device show up at address 0x40?

i2c.read_byte(DEV_ADDR)

I think what you want is i2c.read_byte(DEV_ADDR, CMD_READ_USER_REG)
by Richard-TX
Sat Jan 04, 2014 5:33 pm
Forum: Beginners
Topic: Silly permission issue
Replies: 8
Views: 1497

Re: Silly permission issue

If you want to update the time periodically, look at the command ntpdate. (apt-get install ntpdate) Assuming raspian, there is no need to update the time. The ntp startup script /etc/init.d/ntp takes care of everything. ntpd should take care of adjusting the time after ntpdate has made the initial a...
by Richard-TX
Sat Jan 04, 2014 3:51 pm
Forum: Troubleshooting
Topic: Starting up (solved)
Replies: 8
Views: 1176

Re: Starting up

Did you install Raspian? I would try that. Try a different keyboard. I had an issue with a keyboard. The silly thing had some many lights on it that it taxed the power available via the Rpi's USB port. I got another keyboard. Seems that the simpler the keyboard the better. If you don't have a spare ...
by Richard-TX
Sat Jan 04, 2014 8:33 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Controlling Arduino I2C via RPi for 20x4 LCD
Replies: 6
Views: 2445

Re: Controlling Arduino I2C via RPi for 20x4 LCD

You could use a MCP23008 or MCP23017 as a level shifter. Adafruit does that with one of their "plates".
by Richard-TX
Sat Jan 04, 2014 8:14 am
Forum: Raspberry Pi OS
Topic: Minimalist Raspian
Replies: 4
Views: 1217

Re: Minimalist Raspian

Here is a way to get rid of two totally useless packages and free up over 580 MB of space. # apt-get remove --purge oracle-java7-jdk Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be REMOVED: oracle-java7-jdk* wolfram-engine* 0 up...
by Richard-TX
Sat Jan 04, 2014 8:09 am
Forum: Beginners
Topic: Best OS for beginner
Replies: 6
Views: 1587

Re: Best OS for beginner

RASPBIAN Initially set-up to automatically start X-windows so you get a desktop. You can revert to the command line when you're skilled enough to realise that a GUI is just lipstick on a pig and we don't need no stinking GUIs. In many cases, the only thing that a gui does is to provide a pretty met...
by Richard-TX
Sat Jan 04, 2014 7:52 am
Forum: Advanced users
Topic: Add bluetooth keyboard
Replies: 0
Views: 471

Add bluetooth keyboard

Most of the instruction says to add bluez and two other packages including cups, etc. If all you want is to add a keyboard and/or mouse there are only two packages that are needed. apt-get install bluez python-gobject I made a little script called addblu that makes the rest easy. First run hcitool s...
by Richard-TX
Sat Jan 04, 2014 5:42 am
Forum: Troubleshooting
Topic: Rainbow Splash Screen Upon Reboot
Replies: 18
Views: 4949

Re: Rainbow Splash Screen Upon Reboot

I had a problem with 2 new Pis that I just bought. Both of the made in the UK and from Allied. They would intermittently hang on the rainbow screen. adding boot_delay=1 to the /boot/config.txt file fixed it. The big question is what did the UK builder change? I have Sony built and China built Rpi's ...
by Richard-TX
Sat Jan 04, 2014 4:23 am
Forum: Troubleshooting
Topic: Latest Raspian causing conflicts
Replies: 12
Views: 3431

Re: Latest Raspian causing conflicts

Download the latest image and burn it to a SD card. I have had problems with the upgrade process and in the end I reimaged the SD card. I will likely never do an apt-get upgrade ever again.
by Richard-TX
Fri Jan 03, 2014 2:29 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Data Security on the Pi.
Replies: 1
Views: 623

Re: Data Security on the Pi.

The problem with this is the amount of time needed to properly shut down a Rpi. By the time that power loss is impending, the power is gone and nothing can respond that quick. If you have a UPS then that is a different matter. In the case of the Rpi automatically removing power, there has to be a wa...
by Richard-TX
Fri Jan 03, 2014 2:13 pm
Forum: General discussion
Topic: RasPi with Pineapple mark V checklist
Replies: 4
Views: 1781

Re: RasPi with Pineapple mark V checklist

What is missing from that pack is a good powered USB hub, USB cable to power the Rpi, and optionally a Bluetooth keyboard and mouse. Might need a hdmi to dvi adapter.
by Richard-TX
Fri Jan 03, 2014 2:04 pm
Forum: Beginners
Topic: So tell me about wi-fi adaptors.
Replies: 3
Views: 689

Re: So tell me about wi-fi adaptors.

I have had bad luck with the short tiny dongles. Every one that I bought died within weeks. The ones with a short antenna are lasting. One had been in service for almost a year. The problem with some of them is that they do draw a fair amount of power from the RPI so a powered USB hub is needed. On ...
by Richard-TX
Thu Jan 02, 2014 11:57 pm
Forum: General discussion
Topic: Project Help: Use pi to host website and create wifi network
Replies: 8
Views: 2742

Re: Project Help: Use pi to host website and create wifi net

I think you are making this more difficult than it need be.

1 - get your Rpi on your network with a fixed IP address.
2 - install apache2 (apt-get install apache2)
3 - browse to your Rpi's ip address (http://n.n.n.n)

The rest is up to you.
by Richard-TX
Thu Jan 02, 2014 11:40 pm
Forum: Beginners
Topic: Ethernet
Replies: 4
Views: 677

Re: Ethernet

Cabral wrote:Can we add drivers to the chipset ? Can not be that hard I just need a ride socket .
You also need a ethernet contoller chip and a place to put it. Just get a USB hub and a usb to ethernet adapter.
by Richard-TX
Thu Jan 02, 2014 6:41 pm
Forum: Beginners
Topic: Servo goes crazy with transistor
Replies: 16
Views: 4086

Re: Servo goes crazy with transistor

All or this pain could have been avoided by using this:

Image
by Richard-TX
Thu Jan 02, 2014 6:32 pm
Forum: Troubleshooting
Topic: CRON job
Replies: 4
Views: 896

Re: CRON job

wrapper the whole thing in a script and then call that script from cron. a script might look like this: #!/bin/sh /usr/bin/rsync -av --delete /media/usbhdd1/ /media/usbhdd2/ DATE=`/bin/date` #echo "Backup done at $DATE" | mail me@someaddr echo "Backup done at $DATE" >> /root/backuplog chmod the scri...

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