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by stevech
Tue Apr 02, 2013 2:10 am
Forum: General discussion
Topic: HELP! PLEASE! -- New Raspberry Pi will not boot (SOLVED)
Replies: 15
Views: 1375

Re: HELP! PLEASE!

Please, OP, post with a title describing what you seek or what you have to say.
We really dislike posting topics like "HELP! PLEASE!".
by stevech
Wed Mar 13, 2013 4:37 am
Forum: General discussion
Topic: [SOLVED] Wireless not recognize channels 12 and 13
Replies: 10
Views: 11637

Re: [SOLVED] Wireless not recognize channels 12 and 13

Don't use those two high channels in North America. Other radio services use those frequencies.
by stevech
Sat Mar 02, 2013 10:59 pm
Forum: General discussion
Topic: ground loop with cheap power supply
Replies: 4
Views: 1383

Re: ground loop with cheap power supply

A scope probe in free space (Unconnected), and with the vertical gain up high, will always show power mains signals. They're radiated by the power wiring in your home (50 or 60Hz). What you care about is how much "ripple" is on the DC power in the Pi, and/or in it's audio-in amplifier if there is on...
by stevech
Fri Mar 01, 2013 4:59 am
Forum: C/C++
Topic: Where to find C++
Replies: 22
Views: 8530

Re: Where to find C++

Arduino et al rely on cross-compilers that run on, say a PC, and emit binary instruction code for a microprocessor. The RPi is a computer as said, so the compiler is not in the cross-compilation mode. It would be convenient to cross-compile on a PC for the RPI's CPU as the target, so that the PC's f...
by stevech
Wed Feb 27, 2013 2:52 am
Forum: General discussion
Topic: Wifi Problems
Replies: 9
Views: 980

Re: Wifi Problems

I was lucky... a 2 year old Buffalo brand WiFi USB gizmo had a chipset that just worked. No driver hassles.
by stevech
Wed Feb 20, 2013 5:58 am
Forum: C/C++
Topic: GPIO RF module
Replies: 15
Views: 4660

Re: GPIO RF module

That type of Receiver is far too crude for a beginner to use. You need to start with one that has a MAC layer in the radio. Otherwise, you begin with nothing, nada, zilch and you have to learn everything at the lowest level, in RF communications. Better choices include XBee transceiver with all func...
by stevech
Tue Feb 19, 2013 1:08 am
Forum: Python
Topic: While loop
Replies: 6
Views: 1471

Re: While loop

Do you have to
GPIO.setFunction(?, GPIO.IN) before using the pin?

could GPIO.output(0, x) correspond to pin 3 on the connector?
by stevech
Wed Feb 13, 2013 7:43 am
Forum: C/C++
Topic: Writing code in Visual Studio 2010 vs raspberry pi
Replies: 9
Views: 8236

Re: Writing code in Visual Studio 2010 vs raspberry pi

Hello. I want to make a self driving car using raspberry pi and opencv library . It is posible to write code in Microsoft Visual Studio C++ 2010 and then use that on raspberry pi(is there much to change)? I got Ubuntu and Windows xp on my laptop and i want to do all test here. What is the best way ...
by stevech
Wed Feb 13, 2013 7:39 am
Forum: Python
Topic: Making the serial input buffer larger
Replies: 5
Views: 3174

Re: Making the serial input buffer larger

Something wrong in the app design. I use Python on a much slower CPU and keep up with a high rate. But don't try for 100% constant input data at, say, 115,200 baud. If the hardware loses frame sync, it cannot recover, with 8N1, unless the sender's data has a few character times of idleness. Also, th...
by stevech
Sat Feb 09, 2013 9:21 pm
Forum: General discussion
Topic: PC versus Raspberry
Replies: 8
Views: 1203

Re: PC versus Raspberry

I have a real problem using the RPi and other really cheap computers for teaching young children. In a word, the RPi is too primative, IMO, for MOST OF those younger than high school seniors or undergrads in college/trade schools.

It's like trying to become a finish carpenter with only toy hammers.
by stevech
Fri Feb 08, 2013 2:45 am
Forum: General discussion
Topic: Is PI a good choice for prototyping a commercial product?
Replies: 11
Views: 2746

Re: Is PI a good choice for prototyping a commercial product

commercial product that employs a re-sold microprocessor board... a big issue is warranty costs and warranty pass-through.
by stevech
Tue Feb 05, 2013 3:45 am
Forum: General discussion
Topic: slow, slow forum server from CA, USA
Replies: 1
Views: 460

slow, slow forum server from CA, USA

5-10 seconds to get a web page from raspberry.org.
Been so last 2-3 weeks or so.

Used to be same speed as other hosts I frequent.
by stevech
Sat Jan 26, 2013 10:20 pm
Forum: General discussion
Topic: 3G USB Dongle Support
Replies: 8
Views: 3353

Re: 3G USB Dongle Support

or buy a new/used 3G router such as Cradlepoint CTR500 or equiv.
These have a USB port for popular Verizon (or, yuck, AT&T) or other modem.
And it's a WiFi router. RPi could connect via ethernet or WiFi.
by stevech
Tue Jan 15, 2013 3:05 am
Forum: General discussion
Topic: Pi as Birthday Present for Toddler
Replies: 7
Views: 3229

Re: Pi as Birthday Present for Toddler

Play, play, play - with OTHER KIDS!!! Geesh.

Don't become a "device addict".
Or another sad young person fixated on their device's screen at a restaurant while 3 friends at the table do the same.
by stevech
Thu Jan 10, 2013 6:23 am
Forum: General discussion
Topic: Wireless keyboard/mouse - WIFI capable?
Replies: 5
Views: 1027

Re: Wireless keyboard/mouse - WIFI capable?

You won't see a WiFi keyboard or mouse in consumer-land... too much battery consumption and too expensive since WiFi is no less than 20MHz of bandwidth. Non-bluetooth keyboard/mouse uses $0.30 RF chip - often transmit-only, and runs about 10KHz bandwidth (that's 0.010MHz). In RF, narrower the bandwi...
by stevech
Mon Dec 31, 2012 10:02 pm
Forum: General discussion
Topic: Beware Capacitor C6 et al
Replies: 3
Views: 906

Beware Capacitor C6 et al

Just a light bump and electrolytic capacitor C6, near the USB power connector, fell off. It's a thru-hole capacitor with a plastic gizmo that tries to make them surface mount. But the leads are too small and were not soldered well, so the capacitor fell off. No mechanical support was provided. China...
by stevech
Sat Dec 29, 2012 8:24 pm
Forum: General discussion
Topic: rasberry pi powered through usb hub
Replies: 2
Views: 534

Re: rasberry pi powered through usb hub

So long as the powered hub has a power connection to a wall transformer, and the hub truly provides the standard 500mA or more to the RPi, you're OK.
by stevech
Fri Dec 28, 2012 8:33 pm
Forum: Troubleshooting
Topic: USB output ~ 500mA, My pi wants 700 mA?
Replies: 9
Views: 3323

Re: USB output ~ 500mA, My pi wants 700 mA?

you need a powered USB hub. Comes with a wall transformer.
by stevech
Mon Dec 24, 2012 2:35 am
Forum: General discussion
Topic: Is there a way to have WiFi without USB?
Replies: 14
Views: 1881

Re: Is there a way to have WiFi without USB?

as said above, the trivial way is to use an 802.11 WiFi client bridge product. They are also sold under than name "Game Adaptors". It's trivial - config the bridge to your WiFi SSID/encryption, then connect bridge's ethernet port to RPi's ethernet port. For simplicity, you may want to set the RPi to...
by stevech
Fri Dec 21, 2012 2:44 am
Forum: General discussion
Topic: Accessing Files on a NAS
Replies: 3
Views: 870

Re: Accessing Files on a NAS

My RPi is working through SMB/Samba (easy install) - to access shares on the LAN from my Synology NAS and from some Windows XP/7 PCs on the LAN.
by stevech
Fri Dec 14, 2012 4:54 am
Forum: General discussion
Topic: Solstice Pi
Replies: 6
Views: 992

Re: Solstice Pi

Get the Pi running with an HDMI cable to a monitor/TV you already have.

Then install VNC software on the Pi and use a VNC client on any PC to access the Pi. No need for dedicated monitor, keyboard and mouse for the Pi. Unless you want that extra stuff.
by stevech
Thu Nov 01, 2012 4:41 am
Forum: Python
Topic: IDLE syntax error
Replies: 7
Views: 3332

Re: IDLE syntax error

I use Komodo on a win7 pc. Develop there. When debugged, copy to target system that's Python-capable.

I'm mindful of which Python version I assume. Not 3.x. Not 2.7. Avoid differences among 2.4, 2.5, 2.6 depending on the target. Or just use the least common denominator.
by stevech
Wed Oct 31, 2012 6:28 am
Forum: Python
Topic: IDLE syntax error
Replies: 7
Views: 3332

Re: IDLE syntax error

I went from IDLE to
http://www.activestate.com/komodo-edit

free version is good enough.
I really like this IDE and editor which compiles and shows errors as you type.
easy to define function keys to run code
by stevech
Fri Oct 26, 2012 4:45 am
Forum: General discussion
Topic: VNC on Raspberry PI
Replies: 6
Views: 1174

Re: VNC on Raspberry PI

I've done it.
It's primary means to do keyboard/video/mouse from desktop PC to RPi
by stevech
Tue Oct 23, 2012 3:19 am
Forum: General discussion
Topic: doh! soldering skills FAIL
Replies: 4
Views: 834

Re: doh! soldering skills FAIL

Mine says 220ufd at 16V

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