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by helpme
Sun Aug 18, 2013 4:45 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Maximum current drawn from USB (Model B)
Replies: 8
Views: 5442

Re: Maximum current drawn from USB (Model B)

tonyhughes wrote:All the discussions I have seen revolve around the opinion that beyond 140mA you are going to have problems...
But if that is the case, why did the designers of RPi remove the polyfuse in Model B? I thought that was an admission of design mistake.
by helpme
Sun Aug 18, 2013 4:05 am
Forum: Off topic discussion
Topic: Is it safe to buy stuff with no FCC/CE certification?
Replies: 7
Views: 1761

Is it safe to buy stuff with no FCC/CE certification?

It is possible to buy cheap stuff from China with no FCC/CE certification. Is it unsafe to do so? I guess for wireless products like smartphones, it can be dangerous because the radiation can be very high. But how about non-wireless stuff?

Anyone has experience to share?
by helpme
Sun Aug 18, 2013 4:00 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Maximum current drawn from USB (Model B)
Replies: 8
Views: 5442

Maximum current drawn from USB (Model B)

Model B has no polyfuse that limits current that can be drawn from USB port to 140mA. So, what is the new maximum current that can be drawn from the USB port of RPi Model B?

Thank you.
by helpme
Sat Aug 17, 2013 10:57 am
Forum: Off topic discussion
Topic: What are the consequences of over-charging battery?
Replies: 1
Views: 771

What are the consequences of over-charging battery?

On many occasions, I just leave my smartphone and laptops charging even though they are fully charged. Will the charger still draw current and waste power after battery is fully charged? Is there a danger of over-charging and risk of explosion? Will this shorten the battery life? Hope the more knowl...
by helpme
Sat Aug 17, 2013 6:54 am
Forum: General discussion
Topic: what is purpose of c6 capacitor?
Replies: 4
Views: 1723

what is purpose of c6 capacitor?

C6 capacitor looks huge and fragile. Anyone knows what's its purpose? Hope it can be taken out in future version.
by helpme
Sat Aug 17, 2013 3:43 am
Forum: General discussion
Topic: Recommended software to install on RPi?
Replies: 17
Views: 6704

Recommended software to install on RPi?

One question for the more experienced RPi users. What are your favourite software on RPi?

Let me start the ball rolling
- WebIDE
Wonderful IDE for editing python code
- All the python packages
by helpme
Fri Aug 16, 2013 12:24 pm
Forum: General discussion
Topic: Why does Model A consume much lesser power than Model B?
Replies: 2
Views: 723

Why does Model A consume much lesser power than Model B?

I read that RPi Model A consumes as little as 1/3 the power of Model B. To my knowledge, Model B uses 512MByte RAM while Model A uses 256MByte RAM. How could RAM account for so much power difference? What are the main factors that cause the much higher power efficiency of Model A?

Thank you.
by helpme
Sat Aug 10, 2013 11:15 am
Forum: Raspberry Pi OS
Topic: Raspbian or OpenWRT Access Point?
Replies: 0
Views: 1047

Raspbian or OpenWRT Access Point?

I would like to turn my RPi into an Access Point. The proper OS for Access Point is OpenWRT. But support for OpenWRT on RPi does not look mature at this moment. How about AP support on Raspbian? Has anyone tried successfully to turn Raspbian into an AP? I bought a WPi dongle. Has anyone used this Wi...
by helpme
Sat Aug 10, 2013 6:05 am
Forum: Advanced users
Topic: Underclock RPi
Replies: 7
Views: 5231

Re: Underclock RPi

itimpi wrote:Yes it is possible, but those who have tried it have reported negligible power saving.
Will undervoltage help? Can undervoltage be done on the broadcom chip in the first place?
by helpme
Sat Aug 10, 2013 5:45 am
Forum: Staffroom, classroom and projects
Topic: Do you encourage your children to take on engineering?
Replies: 4
Views: 1875

Do you encourage your children to take on engineering?

This has become a lunch-time topic among my engineering colleagues. One of them sadly mentioned that his son told him that he is very smart and passionate about his work but not rich at all. The son compared his father to a schoolmate's father who work in Wall-Street kind of job with the cars they d...
by helpme
Sat Aug 10, 2013 5:32 am
Forum: Advanced users
Topic: Underclock RPi
Replies: 7
Views: 5231

Underclock RPi

I know this sounds silly. Everyone is talking about overclocking. But I would like to know if it is possible to underclock RPi because this may lead to lower power consumption. Is this even possible?
by helpme
Sat Aug 10, 2013 2:40 am
Forum: Networking and servers
Topic: Can webiopi coexist with Apache webserver?
Replies: 1
Views: 1140

Can webiopi coexist with Apache webserver?

I recently stumbled onto webiopi which allows users to control RPi ports over a browser. Can webiopi coexist with Apache webserver? Do I have to uninstall Apache to get webiopi to work?

Thank you.
by helpme
Fri Aug 09, 2013 11:45 am
Forum: Camera board
Topic: Video analytics projects for Raspberry Pi
Replies: 1
Views: 904

Video analytics projects for Raspberry Pi

I am excited that Raspberry Pi has a camera board which allows one to do Video Analytics. I am totally new to this field but excited about it. With RPi, even a poor man like me can try it. Which library do you people recommend as a start? Are there any open-source camera/video projects using Raspber...
by helpme
Fri Aug 09, 2013 11:39 am
Forum: Other programming languages
Topic: eLua on Raspberry Pi
Replies: 0
Views: 1036

eLua on Raspberry Pi

Is the Raspberry team considering porting eLua to this wonderful board? eLua is embedded Lua. This means using a high-level scripting language like Lua to control hardware functions common in embedded systems.
by helpme
Fri Aug 09, 2013 11:34 am
Forum: Python
Topic: Visual Basic kind of GUI builder for Python
Replies: 4
Views: 9564

Visual Basic kind of GUI builder for Python

I have been using Visual Basic for some time because it enables amatuers like me to build GUI easily. Is there a IDE with GUI-building features similar to Visual Basic for Python? A GUI builder in which one can drag and drop GUI controls, double-clicked on the controls to go to the implementation co...
by helpme
Fri Aug 09, 2013 12:18 am
Forum: HATs and other add-ons
Topic: After reprogramming Atmega328, can Gertboard software work?
Replies: 3
Views: 1618

Re: After reprogramming Atmega328, can Gertboard software wo

Thank you for your patient reply. I think I asked a stupid question. When I read the Gertboard manual, I thought the test programs provided will require the Atmega328 to behave in certain manner. I think there is no need to do so as there seems to be no interaction between the test programs on RPi a...
by helpme
Thu Aug 08, 2013 9:16 am
Forum: HATs and other add-ons
Topic: After reprogramming Atmega328, can Gertboard software work?
Replies: 3
Views: 1618

After reprogramming Atmega328, can Gertboard software work?

After reprogramming the Atmega328 on the gertboard, will it cause the Gertboard software running on RPi to cease functioning? Does the software assume certain firmware to reside on the Atmega328 because of some communication protocol?

Thank you.
by helpme
Thu Aug 08, 2013 8:39 am
Forum: HATs and other add-ons
Topic: Program Gertboard from PC instead of RPi
Replies: 3
Views: 1514

Re: Program Gertboard from PC instead of RPi

The only component on the Gertboard which is programmable is the Atmega chip. No, you can't program that from the PC in a normal way as the PC has no SPI port. Theoretical you could do it if you had an old-fashioned parallel port and bit-bang that. But you rarely see PC with that nowadays. Also tha...
by helpme
Thu Aug 08, 2013 3:19 am
Forum: Beginners
Topic: Can small SDcard image backup be written into larger SDcard?
Replies: 1
Views: 456

Can small SDcard image backup be written into larger SDcard?

Hi Rpi experts,

Can a small SDcard image backup be written into larger SDcard? Will this cause space to be wasted in the larger SDcard?
by helpme
Thu Aug 08, 2013 12:02 am
Forum: HATs and other add-ons
Topic: Program Gertboard from PC instead of RPi
Replies: 3
Views: 1514

Program Gertboard from PC instead of RPi

Is it possible to program Gertboard from PC instead of RPi? PC is much faster than RPi. Has anyone tried that?
by helpme
Wed Aug 07, 2013 11:31 pm
Forum: Raspberry Pi OS
Topic: Why is default swap space at 99M and not bigger?
Replies: 2
Views: 855

Why is default swap space at 99M and not bigger?

As a rule of thumb, swap space is twice that of RAM. Default swap space in Raspbian is 99M. Isn't this far too small? May I ask the more experienced here what is the reason for choosing 99M? Thank you.
by helpme
Wed Aug 07, 2013 1:06 pm
Forum: Bare metal, Assembly language
Topic: Arduino-like libraries for bare metal programming
Replies: 6
Views: 4380

Arduino-like libraries for bare metal programming

Are there Arduino-like libraries for bare metal programming of Raspberry Pi? Arduino libraries are so easy to use. It will be wonderful if such a thing exists. Does it exist?
by helpme
Sun Aug 04, 2013 1:13 pm
Forum: Off topic discussion
Topic: Are microwave oven food healthy?
Replies: 57
Views: 10231

Are microwave oven food healthy?

The microwave oven is a very convenient cooking tool. I have always been worried about whether microwave oven food is healthy. I would like to ask the engineers here, particularly those with microwave background, whether microwave oven food is healthy.
by helpme
Sat Aug 03, 2013 5:09 am
Forum: Off topic discussion
Topic: Smart TV versus Android TV dongle
Replies: 7
Views: 14215

Smart TV versus Android TV dongle

I am thinking of buying a new TV. I would like to use the TV to surf the net. Not sure whether Smart TV or Android TV dongle is better. One thing I certainly hate are Smart TVs running on proprietary OS like Samsung TVs. This is what pushes me to prefer Android TV dongles that turn non-smart TV into...
by helpme
Thu Aug 01, 2013 1:47 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Interfacing RPi to Arduino
Replies: 14
Views: 7372

Interfacing RPi to Arduino

I love Arduino and RPi. Unfortunately, one uses 3V3 and the other uses 5V. Someone advised me that using Arduino Due will solve the problem because the Due uses 3V3. Has someone tried it?

Thank you.

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