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by liudr
Sat Jun 15, 2013 2:11 am
Forum: General discussion
Topic: pi to laptop screen
Replies: 8
Views: 1372

Re: pi to laptop screen

malakai gave some solution here on this thread I started: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=27&t=46473&p=366152#p366152 WebPi also gave me a solution on the same thread using windows remote desktop but you need to install a package on pi. The speed of these two solutions is not as fa...
by liudr
Sat Jun 15, 2013 2:05 am
Forum: Raspbian
Topic: How to benchmark my pi?
Replies: 10
Views: 1965

How to benchmark my pi?

I am running Raspbian on a class 4 4GB card. It is not very fast. I just bought a 32GB class 10 card. I wonder if there is any tool to benchmark the pi so I can see what difference it makes with upgrading SD card. Thanks.
by liudr
Sat Jun 15, 2013 2:01 am
Forum: General discussion
Topic: Fried Pi?
Replies: 11
Views: 5359

Re: Fried Pi?

Exactly the thing I want to avoid so I am not using the GPIO pins. Not until I have a real need (not blinking LEDs or moving a few motors), then I'll just design a board and not use jumper wires. If the OP just wants to play around with some GPIOs, why not using a cheap Arduino or launchpad or picax...
by liudr
Sat Jun 15, 2013 1:55 am
Forum: General discussion
Topic: pi to laptop screen
Replies: 8
Views: 1372

Re: pi to laptop screen

You can use your HP laptop to remotely log on to pi and display pi screen on HP. What operating system is on the HP?
by liudr
Fri Jun 14, 2013 4:32 am
Forum: Off topic discussion
Topic: which arduino should i choose?
Replies: 25
Views: 3949

Re: which arduino should i choose?

Polyfuses are pretty useful. They are only a few ohms in resistance.
by liudr
Thu Jun 13, 2013 8:00 pm
Forum: Off topic discussion
Topic: which arduino should i choose?
Replies: 25
Views: 3949

Re: which arduino should i choose?

If someone shifts the P1 by one pin, puff. I did that before and I consider myself careful. yep :( I did it once but luckily my USB battery seems to have fast short-circuit protection so it tripped and my RPi lived to fight another day :) Simon Praise the polyfuse lord! IIRC, 100mA polyfuses were r...
by liudr
Thu Jun 13, 2013 6:16 pm
Forum: Other projects
Topic: Case incorporating AdaFruit 16x2 LCD Plate
Replies: 39
Views: 19414

Re: Case incorporating AdaFruit 16x2 LCD Plate

Neat! That was a lot of holes drilled to spell Rpi.
by liudr
Thu Jun 13, 2013 4:03 am
Forum: Off topic discussion
Topic: which arduino should i choose?
Replies: 25
Views: 3949

Re: which arduino should i choose?

joan wrote:The TI Launchpad with Energia would have been my first choice if it was still priced at USD 4.30. In the UK it's now GBP 7.20. :(
Ah, I forgot about that. If they carry the spirit of open source, why not? There's also picaxe netduino, etc. that are not expensive to damage.
by liudr
Thu Jun 13, 2013 3:21 am
Forum: Networking and servers
Topic: Wifi range extender or router
Replies: 0
Views: 1543

Wifi range extender or router

I am contemplating whether to use wifi range extender or router (many have extender function) to extend the range of my wifi coverage. My project involves logging data in the field and uploading them to a server. I would like to use one mobile hot spot to access the internet and extend its range to ...
by liudr
Thu Jun 13, 2013 3:10 am
Forum: Off topic discussion
Topic: which arduino should i choose?
Replies: 25
Views: 3949

Re: which arduino should i choose?

You can also destroy your pi with one wrong move. With USB interface as shield, you have the polyfuse on Arduino board to take care of some mishaps. With the bare wires and wrong settings, it is fairly easy to smoke something. You may be extra careful type but that won't apply to most beginners. If ...
by liudr
Thu Jun 13, 2013 2:14 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Can I access the second UART port (UART1)?
Replies: 0
Views: 831

Can I access the second UART port (UART1)?

I am wondering whether I can have access to the second UART port via GPIO pins. I am looking at this:

http://elinux.org/Rpi_Low-level_peripherals

Both UART0 and UART1 Tx and Rx are on the same pins 14 and 15. Any way to access them on separate pins?
by liudr
Wed Jun 12, 2013 5:38 pm
Forum: Off topic discussion
Topic: which arduino should i choose?
Replies: 25
Views: 3949

Re: which arduino should i choose?

Well...no doubt. But in the Arduino forums he'd probably get blasted for asking which model he should get to use with a Raspberry Pi. Not really. If you ask in the non-tech subforum then you get much useful information: http://forum.arduino.cc/index.php?topic=169417.0 I bet you can also ask under i...
by liudr
Wed Jun 12, 2013 5:20 pm
Forum: Other projects
Topic: Case incorporating AdaFruit 16x2 LCD Plate
Replies: 39
Views: 19414

Re: Case incorporating AdaFruit 16x2 LCD Plate

Then you will have to use buttons with long shafts or special buttons that can wear a cap to increase height. Do you have pictures of the inside of your box i.e. how they fit together? Can you design some circuit boards yourself like this type? http://www.inmojo.com/store/liudr-arduino-and-physics-g...
by liudr
Wed Jun 12, 2013 3:48 am
Forum: Other projects
Topic: Case incorporating AdaFruit 16x2 LCD Plate
Replies: 39
Views: 19414

Re: Case incorporating AdaFruit 16x2 LCD Plate

How many buttons do you want and in what kind of layout? What does it look like inside the box? ;) I have several serial LCD face plates that you could take a look here: http://www.inmojo.com/store/liudr-arduino-and-physics-gadgets/item/serial-lcd-back-pack---phi-panel/ The one with matrix keypad is...
by liudr
Tue Jun 11, 2013 9:25 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Question about the serial port and preventing linux from use
Replies: 9
Views: 2545

Re: Question about the serial port and preventing linux from

What is the brand and model of your wireless router? Mine has a web based admin page to do all the things that your router can't do and it's not an expensive or latest model. My last one can do something like that too, just more basic. Maybe yours can do it too MAC-IP binding and view attached device.
by liudr
Tue Jun 11, 2013 5:48 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Question about the serial port and preventing linux from use
Replies: 9
Views: 2545

Re: Question about the serial port and preventing linux from

Thanks for the info provided to the OP. I found it quite useful. I am at the moment using USB TTL adapter but could migrate to the built-in serial port too, with the instructions provided here :)
by liudr
Tue Jun 11, 2013 5:35 pm
Forum: General discussion
Topic: Using Laptop as Monitor
Replies: 3
Views: 1842

Re: Using Laptop as Monitor

A solution is provided by malakai on this thread:

http://www.raspberrypi.org/phpBB3/viewt ... 52#p366152

This is basically like the windows remote desktop. You log on to pi with your win 7 machine and see desktop, and interact with icons.
by liudr
Tue Jun 11, 2013 3:59 am
Forum: General discussion
Topic: [FYI] Compatible keyboard on sale (USA officemax)
Replies: 0
Views: 651

[FYI] Compatible keyboard on sale (USA officemax)

Hope this is OK with the forum rule. I found this logitech keyboard/mouse combo is on sale: http://www.officemax.com/technology/keyboard-mouse-accessories/keyboard-mouse-sets/product-prod3290590 It is listed as compatible with the pi here: http://elinux.org/RPi_VerifiedPeripherals#Working_USB_Keyboa...
by liudr
Mon Jun 10, 2013 1:27 am
Forum: Beginners
Topic: Restoring SD card from backup made using dd
Replies: 13
Views: 10568

Re: Restoring SD card from backup made using dd

Thanks! I will try that after I get a 16GB SD card. I was just not committed to pi when I prepared the SD card :)
by liudr
Sun Jun 09, 2013 11:59 pm
Forum: Other projects
Topic: High temperature sensors
Replies: 3
Views: 5142

Re: High temperature sensors

What is your definition of "extremely high temperature"? It sounds like "very fast raspberry pi". For sensing hundreds to a couple thousands of degrees you could use infrared temperature sensors.
by liudr
Sun Jun 09, 2013 11:35 pm
Forum: C/C++
Topic: Serial programming problem
Replies: 0
Views: 773

Serial programming problem

I am a noob on the linux system. I am trying to do this: Open a serial port (USB TTL adapter), receive some characters, print them as I receive them, send some out, close the port. What I was NOT able to do: sending characters out for immediate output. The characters are held up until I close the po...
by liudr
Sun Jun 09, 2013 11:03 pm
Forum: Beginners
Topic: Restoring SD card from backup made using dd
Replies: 13
Views: 10568

Re: Restoring SD card from backup made using dd

I was able to use the win32 disk imager in winodws 8 to backup the original rasbian SD card that is 4GB. I then made a copy of it on a different brand 4GB SD card. I booted the pi and was able to log on and do stuff like running Arduino IDE. Tied to run eclipse but it just couldn't start on pi. [EDI...
by liudr
Sun Jun 09, 2013 7:58 pm
Forum: Beginners
Topic: [Solved] Noob trying to communicate with serial port
Replies: 8
Views: 2633

Re: [Solved] Noob trying to communicate with serial port

I am struggling to understand how to cleanly disconnect from a serial port I just opened. If I do it right, I think Arduino IDE will be able to list that port as available after I disconnect but it doesn't. So should I do detach, break, or quit to cleanly disconnect from the serial port? Thanks.
by liudr
Sun Jun 09, 2013 7:48 pm
Forum: Other projects
Topic: Connect small lcd screen
Replies: 4
Views: 1491

Re: Connect small lcd screen

Not a picture of the photo frame. A picture of the disassembled photo frame with some identification on the LCD panel would probably help. Don't have your hope too high. I have seen enough of these proprietary components go to waste because there is no documentation on how to use them.
by liudr
Sun Jun 09, 2013 7:46 pm
Forum: General discussion
Topic: Help needed to wire a 20x4 hd44780 lcd for use with LCDproc
Replies: 5
Views: 2690

Re: Help needed to wire a 20x4 hd44780 lcd for use with LCDp

Exactly, it depends on the spec sheet. What adafruit sells has the spec sheet, a 5V lcd with 0.7*Vdd as minimal HIGH. Still their own tutorial disregarded this. This is NOT new to me or adafruit. A while back I was trying their OLED displays but failed multiple times with several basic LCD commands,...

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