Go to advanced search

by pjc123
Tue Aug 06, 2013 4:40 pm
Forum: Troubleshooting
Topic: Problem with Airlink 101 (RTL8191SU chipset)
Replies: 7
Views: 3565

Re: Problem with Airlink 101 (RTL8191SU chipset)

In any case, I have it working now. Looking at your wpa_supplicant.conf files and comparing the working one to the non-working one, I suspect the main reason why it was not working originally was because you set the wrong protocol. In the original non-working file you have "proto=RSN" which is an a...
by pjc123
Mon Aug 05, 2013 6:41 pm
Forum: General discussion
Topic: Not Satisfied with your Wireless Pi? Try Ethernet!
Replies: 13
Views: 2305

Re: Not Satisfied with your Wireless Pi? Try Ethernet!

Like this is some great revelation.
by pjc123
Mon Aug 05, 2013 11:25 am
Forum: General discussion
Topic: What's the simple and safe way to do a "shutdown" button?
Replies: 60
Views: 65271

Re: What's the simple and safe way to do a "shutdown" button

paulv wrote:pjc123, look at post 40, just above your entry, where I explain how to use an interrupt.
That is Python, not "C". If someone has actual working code for "C" and my library, I would be interested.
by pjc123
Mon Aug 05, 2013 10:58 am
Forum: General discussion
Topic: What's the simple and safe way to do a "shutdown" button?
Replies: 60
Views: 65271

Re: What's the simple and safe way to do a "shutdown" button

Has anyone found a way to use interrupts to perform a shutdown using Mike McCauley's "C" Library. I have been using polling, which works great for my headless pi, but not the most efficient method.
by pjc123
Fri Aug 02, 2013 10:49 pm
Forum: Beginners
Topic: pi case - cant get to gpio?
Replies: 9
Views: 5395

Re: pi case - cant get to gpio?

I have the equivalent of this one: http://www.adafruit.com/products/1144 It is great, except for one flaw....The SD card holder blocks one of the cross style center mounting holes. However it does have 4 feet with an additional set of very small mounting holes. It comes in various colors. Mine was f...
by pjc123
Fri Aug 02, 2013 4:18 pm
Forum: Staffroom, classroom and projects
Topic: Best Place to buy Electronics?
Replies: 15
Views: 8682

Re: Best Place to buy Electronics?

Here in northern NJ, the place to buy from USED to be Lashen Electronics in Denville. When I was working up in Northern NJ (Whippany, NJ), I also used to go to Lashen Electronics. But where I was living, in Central New Jersey, there were great electronics stores in the Green Brook area, but I think...
by pjc123
Wed Jul 31, 2013 4:15 pm
Forum: Beginners
Topic: Using a mirco USB car charger with the Raspberry Pi
Replies: 13
Views: 10861

Re: Using a mirco USB car charger with the Raspberry Pi

I suggest the Vority Dual USB Car Charger , I assure it's really worth it my mom gave it to me when I was on having my lon and it was assuring it really save me a lot.e me a lot. I've checked the car charger my mom gave to me http://www.amazon.com/Dual-USB-Charger-3-1Amp-15-5W/dp/B00CD0JBZK and it ...
by pjc123
Wed Jul 31, 2013 2:00 pm
Forum: Off topic discussion
Topic: UDOO Single Board Computer Reached its Funding Target
Replies: 5
Views: 2274

Re: UDOO Single Board Computer Reached its Funding Target

Prrth http://shop.adapteva.com/ more bang for your buck! You know, I didn't, but I was going to add the statement, "Watch, by the time October comes around there will be another slew of new boards from different manufacturers to choose from and make the choice more difficult". It is a fantastic thi...
by pjc123
Wed Jul 31, 2013 1:55 pm
Forum: Off topic discussion
Topic: UDOO Single Board Computer Reached its Funding Target
Replies: 5
Views: 2274

Re: UDOO Single Board Computer Reached its Funding Target

joan wrote:The price is King.

It'll need to be $49.99 to beat the Pi.
Like I said, I am not trying to compare it to the pi. It is in a whole different league price-wise, feature-wise and performance-wise.
by pjc123
Wed Jul 31, 2013 1:36 pm
Forum: Off topic discussion
Topic: UDOO Single Board Computer Reached its Funding Target
Replies: 5
Views: 2274

UDOO Single Board Computer Reached its Funding Target

I have to say that this is a really nice board, and may be my next board; after a year of playing with the pi, I have started getting the itch to move onto something new and different. It has many of the features I find lacking in the pi, but don't get me wrong, as I am not trying to compare it to t...
by pjc123
Tue Jul 30, 2013 10:24 pm
Forum: Troubleshooting
Topic: Solved repeating keys caused by radio interference
Replies: 1
Views: 588

Re: Solved repeating keys caused by radio interference

I had the same issue on my desktop computer. By moving one dongle to the usb port in the rear and the other to the usb port in the front, the problem went away. The repeating character problem with my pi is a different unrelated issue, as noted many times on this forum, and I just switched to a wire...
by pjc123
Tue Jul 30, 2013 12:26 pm
Forum: Beginners
Topic: Removing/Desoldering Components - Any Gotchas?
Replies: 11
Views: 10119

Re: Removing/Desoldering Components - Any Gotchas?

As was mentioned, if I am not keeping the part to be removed, I always try to snip off the leads first. This has two advantages. The first obvious one is it makes it easier to get to the solder on the pads to remove the remaining lead and/or solder. The second is that it eliminates the heat sink eff...
by pjc123
Tue Jul 30, 2013 1:21 am
Forum: General discussion
Topic: Raspberry Pi on ShowCase TV Show Continuum
Replies: 7
Views: 3030

Re: Raspberry Pi on ShowCase TV Show Continuum

Judging by the location of the screwdriver in the picture, and since I don't see a standoff or a chassis, if it is a Rev2 board he must be trying to jam an oversized mounting bolt or screw into the mounting hole. If it is a Rev1 board, good luck getting it into TP1. I guess the show doesn't have the...
by pjc123
Mon Jul 29, 2013 6:27 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO State in Shutdown Mode
Replies: 14
Views: 6094

Re: GPIO State in Shutdown Mode

You might want to see if you could trigger off of the UART TXD GPIO pin. It is HIGH while the pi is running and goes LOW after the shutdown procedure has completed; no programming necessary. In my case I have it hooked up to an LED to let me know when the shutdown procedure has completed so I can tu...
by pjc123
Mon Jul 29, 2013 2:11 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: GPIO State in Shutdown Mode
Replies: 14
Views: 6094

Re: GPIO State in Shutdown Mode

I know at bootup it is an INPUT and LOW, and floating, so neither a LOW or HIGH state is guaranteed. Are you setting this pin to an OUTPUT in your software when actually using it? If so, put a 10K resistor from the GPIO pin to ground and it will guarantee a LOW until you specifically set it to an OU...
by pjc123
Mon Jul 29, 2013 1:54 pm
Forum: General discussion
Topic: Backing up: definitive answers
Replies: 11
Views: 3162

Re: Backing up: definitive answers

Defiant wrote:Why don't you let the NSA do the Backups for you? ;)
Nice.
by pjc123
Thu Jul 25, 2013 8:40 pm
Forum: General discussion
Topic: Interfacing using ULN2003A
Replies: 9
Views: 2835

Re: Interfacing using ULN2003A

Vcc goes to the circuitry associated with the left side of the opto in order to isolate it from the coil and relay. JDVcc goes to the right side of the opto and the relay coil and associated circuitry, which requires a lot more current and can produce nasty spikes. You can either leave the jumper on...
by pjc123
Thu Jul 25, 2013 6:06 pm
Forum: General discussion
Topic: Interfacing using ULN2003A
Replies: 9
Views: 2835

Re: Interfacing using ULN2003A

The GPIO pins (most) are set to INPUTS and are LOW, but they are "floating" until you set them in software, and therefore can be in a LOW state or a HIGH state depending on the way the wind is blowing (not actual wind, just a saying). The 10k resistor keeps them LOW until you are ready to set it in ...
by pjc123
Thu Jul 25, 2013 5:51 pm
Forum: General discussion
Topic: Interfacing using ULN2003A
Replies: 9
Views: 2835

Re: Interfacing using ULN2003A

Thanks for the help. Just tested it and all the relays work :). I have a feeling it may have been the schematic I found was a bit off! Going to try and wire up the 2n222a NPNs and resistors myself and see if I can get it to work. Here is how to wire that up as well, as I am doing the same thing (al...
by pjc123
Thu Jul 25, 2013 5:04 pm
Forum: General discussion
Topic: Interfacing using ULN2003A
Replies: 9
Views: 2835

Re: Interfacing using ULN2003A

I can sympathize with you being new to electronics, but a whole bunch of people have wired these Sainsmart boards up and their equivalents and show you how to do it on this forum and all over the web with pretty little pictures. You need to supply the model number, as there are a lot of Sainsmart ca...
by pjc123
Thu Jul 25, 2013 4:27 pm
Forum: General discussion
Topic: Back up power supply
Replies: 13
Views: 1796

Re: Back up power supply

I can recommend the APC brand of UPS's; they are of very high quality. Both APC and Linux supply software for these units, but you need to make sure whatever unit you pick, it has the capability of automatic shutdown after the batteries are nearly depleted in the event you are not there to do a safe...
by pjc123
Thu Jul 25, 2013 12:10 pm
Forum: Troubleshooting
Topic: Any usb hub recommendation??
Replies: 9
Views: 1913

Re: Any usb hub recommendation??

I originally started looking at USB 3.0 hubs, just because it does not make sense to buy old technology, but couldn't find one that users reported working with the pi. So, recently I also settled with the Plugable USB2-HUB-AG7 which had fantastic reviews from pi users as well as others, and although...
by pjc123
Wed Jul 24, 2013 10:50 pm
Forum: Beginners
Topic: Monitor my Septic System
Replies: 3
Views: 629

Re: Monitor my Septic System

I see.
by pjc123
Wed Jul 24, 2013 6:11 pm
Forum: Beginners
Topic: 2 usb drives
Replies: 4
Views: 563

Re: 2 usb drives

Just make sure that you do not exceed the power that is delivered by your hub's power supply.
by pjc123
Wed Jul 24, 2013 6:06 pm
Forum: Beginners
Topic: Monitor my Septic System
Replies: 3
Views: 629

Re: Monitor my Septic System

OK, I have to ask. What happens if you don't turn the septic pump off.....do you risk getting sprayed with liquid poop or something while you are mowing the lawn?

Go to advanced search