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by pjc123
Tue Jul 23, 2013 11:58 am
Forum: Other projects
Topic: 12v dc battery to 5v power supply
Replies: 4
Views: 10369

Re: 12v dc battery to 5v power supply

There are several ways of doing this, but I chose the cigarette lighter USB power supply method as well, because it is the easiest and most flexible. However, there is no need to rip it apart; just get a cigarette lighter socket. That way you can still use it other places and for other uses, and if ...
by pjc123
Mon Jul 22, 2013 3:48 pm
Forum: Other projects
Topic: Controlling several solenoid valves with RPI
Replies: 15
Views: 7896

Re: Controlling several solenoid valves with RPI

If it's important that the solenoids do not operate during boot you can't rely on the initial gpio state (unless you plan never to update the software/firmware). That is already stated in the link I provided and is a very rare occurrence. In a years time I have never come across this problem. Stran...
by pjc123
Mon Jul 22, 2013 1:31 pm
Forum: Other projects
Topic: Controlling several solenoid valves with RPI
Replies: 15
Views: 7896

Re: Controlling several solenoid valves with RPI

One thing I forgot to mention is that what I have stated applies to a 5v JD-VCC supply and a 5V VCC supply. I tried using a 3.3V VCC supply without the transistor and keeping it active LOW, but there just wasn't enough power to light up the optos reliably. Between the 1k resistor and the two LED's t...
by pjc123
Mon Jul 22, 2013 11:10 am
Forum: General discussion
Topic: ******** the pi!
Replies: 30
Views: 4840

Re: ******** the pi!

tick, tick, tick. Countdown to thread lock.
by pjc123
Mon Jul 22, 2013 11:08 am
Forum: Other projects
Topic: Controlling several solenoid valves with RPI
Replies: 15
Views: 7896

Re: Controlling several solenoid valves with RPI

joan wrote:If it's important that the solenoids do not operate during boot you can't rely on the initial gpio state (unless you plan never to update the software/firmware).
That is already stated in the link I provided and is a very rare occurrence. In a years time I have never come across this problem.
by pjc123
Mon Jul 22, 2013 10:55 am
Forum: Other projects
Topic: Controlling several solenoid valves with RPI
Replies: 15
Views: 7896

Re: Controlling several solenoid valves with RPI

Thanks for that informative answer pjc123. I had not searched this forum but I had tried google it many times, maybe wrong search words. And yes you are right about that they are not SSR but there are such available as well. I think right now I will go with that you've proposed and try to find out ...
by pjc123
Sun Jul 21, 2013 10:08 pm
Forum: Other projects
Topic: Controlling several solenoid valves with RPI
Replies: 15
Views: 7896

Re: Controlling several solenoid valves with RPI

I am a bit confused....the following is not an SSR (Solid State Relay), it is a basic mechanical relay. http://www.sainsmart.com/arduino-compatibles-1/relay/8-channel-relay/8-channel-dc-5v-relay-module-for-arduino-pic-arm-dsp-avr-msp430-ttl-logic.html That said, this relay board has been discussed l...
by pjc123
Sun Jul 21, 2013 6:31 pm
Forum: General discussion
Topic: ******** the pi!
Replies: 30
Views: 4840

Re: ******** the pi!

Some people just experience the "Peter Principal" when they advance past the hand holding of operating systems like Windows, Mac or Android, or need to buy hardware with just a power button that is ready to go, or need the unbelievably annoying paper clip to pop up in Microsoft Office to tell them e...
by pjc123
Sun Jul 21, 2013 11:39 am
Forum: Beginners
Topic: Debating on which language to learn
Replies: 10
Views: 2167

Re: Debating on which language to learn

I appreciate the input. Thanx. I think I will start off with C based on what kghunt said about the gpio issues. Something I definitely don't want to have to worry about. Been about 20 years since I have done C, time to start re-learning. :| Thanx everyone. I also had to brush up on C when I started...
by pjc123
Sat Jul 20, 2013 1:26 pm
Forum: General discussion
Topic: ******** the pi!
Replies: 30
Views: 4840

Re: ******** the pi!

I have three pis and I don't have a single issue you are experiencing, one of them also for a year, and I have used three different power supplies with each of those pis. Everything you mention points to a defective power supply cable connector (both falling out and probably partially falling out wh...
by pjc123
Sat Jul 20, 2013 12:40 pm
Forum: General discussion
Topic: GPIO state on reboot
Replies: 5
Views: 4953

Re: GPIO state on reboot

[quote="Zardoz"]Ohh thank you. Very useful. From python I set (input/output) mode and (True/False) state. High/Low? True = High = 3.3 volts. False = Low = O volts = Gnd (Actually it is a range of voltage, but I will not complicate the issue). What does it mean then ALT0? Each GPIO has its basic func...
by pjc123
Sat Jul 20, 2013 10:52 am
Forum: General discussion
Topic: [Help] The system cannot find the file specified
Replies: 2
Views: 638

Re: [Help] The system cannot find the file specified

Are you using the torrent file by mistake?
by pjc123
Sat Jul 20, 2013 10:47 am
Forum: General discussion
Topic: GPIO state on reboot
Replies: 5
Views: 4953

Re: GPIO state on reboot

See the charts here (One change to the REV 1 board chart is that I am also seeing a HIGH on GPIO8 at very first boot, otherwise both charts are consistent with what I am seeing on my Rev 1 and Rev 2 boards): http://www.raspberrypi.org/phpBB3/viewtopic.php?f=44&t=35321 I don't know a way of changing ...
by pjc123
Thu Jul 18, 2013 11:28 am
Forum: General discussion
Topic: SD corruption on power outages
Replies: 8
Views: 4171

Re: SD corruption on power outages

Hello, I'm very pleased with the RP, I own 2... but is there a way to prevent SD corruption after a power failure or shutdown. APC UPS at home, strictly batteries in the field, running 3 pi's (one for a year), and I never had a corrupted SD card, with more power glitches and shutdowns than I can co...
by pjc123
Wed Jul 17, 2013 11:32 am
Forum: Advanced users
Topic: Pi router connection
Replies: 1
Views: 843

Re: Pi router connection

Are you trying to set up roaming, where you automatically connect to the router with the strongest signal or the router that is turned on at the time, or do you need to manually change routers? If roaming is what you want, see my post here how to set up the network files: http://www.raspberrypi.org/...
by pjc123
Tue Jul 16, 2013 5:12 pm
Forum: General discussion
Topic: How to put terminal commands into file?
Replies: 4
Views: 4357

Re: How to put terminal commands into file?

Here is an excellent free book that not only explains how to write and run shell scripts (Chapter 24), but goes into all other aspects of the command line as well. http://linuxcommand.org/tlcl.php To run the command at boot, you can either put it in the file /etc/rc.local or as part of the /etc/init...
by pjc123
Tue Jul 16, 2013 4:38 pm
Forum: General discussion
Topic: Firmware broken in ALSA?
Replies: 9
Views: 2022

Re: FIRMWARE BROKEN YET AGAIN

I am on my third pi, one I bought when it was first released, and on my third Debian based image revision, and I have yet to, nor will I ever do an rpi-update, unless there is a major specific problem that I may need a fix for in the future. I have no desire to troubleshoot bleeding edge firmware is...
by pjc123
Tue Jul 16, 2013 11:18 am
Forum: General discussion
Topic: Voltmeter Recommendations
Replies: 11
Views: 2584

Re: Voltmeter Recommendations

I have only bought Fluke multimeters at work and at home. They are accurate and will last a lifetime, but they are not cheap. I can't speak for the quality of the cheaper units.
by pjc123
Fri Jul 12, 2013 11:05 am
Forum: Troubleshooting
Topic: Occidentalis and the Airlink 101 usb wifi dongle
Replies: 11
Views: 1844

Re: Occidentalis and the Airlink 101 usb wifi dongle

bluecamel wrote:Well, it gets stranger.
Did you do an "apt-get upgrade" or "rpi-update" just before everything worked?
by pjc123
Fri Jul 12, 2013 11:01 am
Forum: Troubleshooting
Topic: OurLink wifi dongle cannot connect
Replies: 5
Views: 4923

Re: OurLink wifi dongle cannot connect

Finally, how would I turn up debug mode as you suggested? ... It goes in the "wlan0" (or wlan1, etc., depending on your application) section of the /etc/network/interfaces file. Don't add the other lines that I showed, as I was just showing the area of the file to place it. Once you do that, you mi...
by pjc123
Thu Jul 11, 2013 6:46 pm
Forum: Other projects
Topic: USB Hub Help
Replies: 3
Views: 752

Re: USB Hub Help

Are you trying to supply access to the ports from outside the case, or for some reason are you trying to place them in exact locations inside the case?
by pjc123
Wed Jul 10, 2013 11:53 am
Forum: Beginners
Topic: What is the benefit of assigning a static ip on the router?
Replies: 15
Views: 2508

Re: What is the benefit of assigning a static ip on the rout

Nice project! Sounds like your from the states. In which case - "Happy fourth of July!" A little late, but appropriate I think, given the firework theme. Yes, from the states. I did a lot of testing before-hand, but the 4th was the first time I really got to try everything out together and it worke...
by pjc123
Tue Jul 09, 2013 10:31 pm
Forum: General discussion
Topic: Newbie help
Replies: 13
Views: 1545

Re: Newbie help

Gosh, the plot thickens! It does seem incredibly complicated - simplicity seems unknown to Linux!! I will go and read the pages suggested and play further. Presumably, in the desktop, if you are not logged as root beforehand, your only option to extend privileges is to "open folder as root" (or ope...
by pjc123
Tue Jul 09, 2013 10:21 pm
Forum: General discussion
Topic: Newbie help
Replies: 13
Views: 1545

Re: Newbie help

W. H. Heydt wrote:
pjc123 wrote: (2) "su – root"
(a) password:
"su -" is sufficient, as su assumes the target account is root if one isn't specified.
Yes, I am aware of this.....I just didn't want to add confusion to a newbie.
by pjc123
Tue Jul 09, 2013 4:03 pm
Forum: General discussion
Topic: Newbie help
Replies: 13
Views: 1545

Re: Newbie help

One of the issues is the environment you are thrown into (PATH, HOME directory, privileges, etc.): If you scroll down the following page to the chart that someone posted, you can see the many ways of accessing root privileges, along with the differences of each method: http://forums.opensuse.org/eng...

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