Ask OLPC a Question about Hardware

Touchscreen

I think the following should be put on Hardware Ideas, but there is no proper subcategory for this idea. I can not find a way to creat a new subcategory. If somebody can add a subcategory --touchscreen, please move the message to it. I'll upload an image to make my idea clearer.

Touchscreen is a natrual way for people to interact with computer. Its price barrier prevents it from more extensive applications. The infrared touchscreen with retroflector only needs a few components(reflective tape,two optical scanners, collimated light sources and light detectors) and the price can be very low. The problem is reliability and cost of the scanners. An invention on optical scanner has soloved the problem. I estimate that the inventions on key components can drive the touch screen's unit cost down to $5 at mass production volumes.

The optical approach to the touchscreen needs not a film to cover the screen. It has following advantages: 100% transpmittance, Easy to install, high resolution, high reliability, very low power consumption. The cost is almost the same for larger and smaller size screen. It is possible to save the cost of keyboard and touchpad if their layout can be changed. More discussions are welcome.(User: Jun)

Or, it could incorporate two screens, using one for controls and one for image output (217.36.120.131 10:24, 7 October 2006 (EDT))

Can I also ask what is the price comparison between a touchscreen and a touchpad? Is it just conservative inertia amongst developed country computer users that is favouring a touchpad? Check out the Psion Netbook (review here: http://www.geek.com/hwswrev/pda/netbook/netbook.htm ) for a solid state laptop controlled by a touchscreen. Even though its late 90s we still use it daily as a wireless domestic machine as it is indestructable, simple and easy and ergonomic to use. Simon Chadwick

Touchscreen issues are already dealt with elsewhere in the Wiki. Use the Search button at the left to find the pages. Note that the touchpad on the 2B1 can be used similar to a touchscreen for some functions such as handwritten input.

I'd give that about 2/10 as an answer, but thanks anyway lol :-)

Flash memory

Won't the flash memory wear out eventually? If a child uses it from 6 to 18, that's 12 years of usage. If the conditions are harsh and there's a heavy usage it eventually will start failing. Shouldn't it be at least replaceable? http://en.wikipedia.org/wiki/Flash_memory#Limitations

• There are several mechanisms on the OLPC that are designed to increase the life of the laptop: (1) the chips themselves are designed to move writes around so that no cell gets written to repeatedly, minimizing the probability of killing it; and (2) the Journaled Flash File System is also designed to move writes around, to further minimize block failures. I'd imagine that the OLPC won't be continously rewriting bits—e.g., there won't be a swap file—given the limited number of writes, and the fact that they will be moved around, the flash should have a pretty long life. --Stranger 18:15, 30 July 2006 (EDT)

• [1]

What are the expected shipment volumes or units of the olpc for 2006-2011? Do you expect the density of the NAND Flash to increase over time as the price drops to the $10 NAND price for 512MB or 4Gbit SLC NAND part today? alan.niebel@web-feetresearch.com

Shipments start at 5 million, after contracts for that many are signed. It would be foolish to attempt to forecast demand after that, but it is conceivable that several hundred million units will be needed over the next decade, or possibly even sooner.

Is there a drawback to using flash memory? It seems from this website that it is very economical, but how come laptops and computers still use hard drives? Why doesn't everyone switch over to flash memory?

Where can I buy this Touchpad?

My laptop has a very different touchpad than the olpc laptop has. Is it possible to buy that kind touchpad with an USB connector?

Where can I buy this Hardware?

I´m a developer of embarked systems and I would like to acquire the Hardware of the project. He is possible?

After the launching, the hardware (Mother board) could be sold ?

The Developer's program page lists how to obtain one of the test boards. Since you received the board free, I imagine you must return the boards once you are done using them, and cannot sell them. --SamatJain 13:50, 8 August 2006 (EDT)

DOS and BIOS drive recognition for OS repair

Is the 512mb primary drive write protected? Can the operating system be updated or, if it crashes, reinstalled. Is disk cloning supported? Can one USB port be used to load a DOS diagnostics and repair program while another USB port is used to download files or for disk cloning? Can the BIOS (and, by extension, a program like Ranish Parition Manager) see two USB drives simulaneously?

The 2B1 is not a PC. It doesn't run DOS and it doesn't run DOS software like the Ranish partition manager. It will not run DOS or any DOS diagnostics unless someone chooses to port such software which will probably involve replacing the BIOS and making the unit incompatible with the standard 2B1 software build. As far as USB capabilities, those are whatever Linux supports. At a minimum, 4 ports should support 4 simultaneous disk drives but with chaining the number could be quite a bit higher. Your question about the 512 disk drive is answered elsewhere on the wiki. Try the Search button at the left. If you get stuck, try JFFS as a keyword.

Wear levelling

Will wear levelling and bad block management be used to prevent and cope with failure of cells from excessive overwriting of some blocks of the 512mb flash drive?

 Built into JFFS2, as well as compression to reduce the data size.  --Bluefoxicy 15:38, 23 September 2006 (EDT)

Built-In GPS Unit?

With GPS units becoming cheaper and cheaper, I see this $100 laptop as a great product if it had a built-in gps receiver. Even put a small switch to turn off the receiver when not in use to save battery. I know the machine has 3 usb ports and I could add a gps module, but having it already built-in just makes it that much cooler! What gps units have you seen that have generators attached to recharge the batteries - complete with wifi and a lcd screen - for less than $500-$600 USD? - And adding a gps module would would only marginally increase the current $138 USD.

The OLPC design includes GPS capability. It is called a USB port and there are 4 of them. They can be used for an astounding variety of peripherals. For instance, using a USB-Serial adapter one of the cheap GPS bricks will work with the OLPC. Or you could add a USB Bluetooth adapter and a cheap GPS brick that uses Bluetooth. I have a Nokia N70 telephone with Python and Bluetooth and I bought one of the cheap Bluetooth GPS bricks. After a few hours with Google and Python I was able to write a script to grab and save GPS locations over Bluetooth. I imagine it would be just as easy to do on the 2B1.

The hardware: schematics?

Are schematics for the Btest Boards available?

If you join the design team. Not for people who just want to make a few for themselves. You can get information on nearly equivalent boards on the Build your own page. --Mokurai 06:03, 7 November 2006 (EST)

Are the schematics going to be available to the public?

Wireless Mesh Testing

Considering the recent slashdot story about partially connected networks, and to what extent they are still a research project, it sounds important to test the Marvell firmware-based mesh networking technology. What kinds of large-scale tests or simulations have been performed to justify the expectation that the wireless mesh would work as hoped?

Someone also asked here: http://www.mail-archive.com/networking@laptop.org/msg00013.html

Power / Energy

What about (alternatively) using pedals?

I don't know how much a hand crank would need to be used, but using feet instead of hands is a much LESS involving "experience", so those children could perform other tasks ( who knows how busy they are! :-| ) while also preparing the laptop for using it soon after. Also, pedals could keep the hands free for using the computer.

This question and many others are answered on the Battery and power page. Note that the charger is not built-in to the laptop, it is an external device. Therefore any other means of providing electricty can be used in place of the charger.

About Power Generation

Why don't you put large solar cell panels on the laptop, this will recharge the battery all the time. And the battery life will be longer. - Nikolay Banchev - Bulgaria nikolaybanchev@gmail.com

The cells don't need to be on the laptop. See Battery and power.

Power

How much power are we talking about, exactly? A FAQ estimates milliamps, but that is not a power. How many watts, typical?

Figures from the hardware specification page

Capacity, 22.8 Watt-hours; 6 volts; maximum power 500 mA; so 3 watts for 7+ hours.--Ed Cherlin 2006/09/14 21:42 GMT - 07:00

I just recently heard that the project will be using a foot-powered crank, instead of the hand-crank directly on the machine. Could the foot powered crank be used to power other laptops (recycled, or otherwise) or even adapted to power other devices? There is already a device on the market, that I saw in Popular Science, that is a small foot powered generator, capable of powering small devices, such as drills, saws, etc. Consider other interfaces... Stay on the idea of giving out the $100 laptop, but if you have the foot crank already, why not let people donate their old laptops, and use the crank to power them. Go from the $100 laptop to the free laptop, and $35 foot crank. And use the other $65 to pay for shipping to a poor kid! After all you'll still have to ship the $100 ones, that's if they even get to the kids...

• Unfortunately, conventional laptops (even old ones) typically require far more power.

I only know about thermal solar cells through pop science but, i read in their that they are far more efficient per unit size than photovoltaics. I was wondering if the low powered e-book part could be powered by thermal cell grips on the device as well as a flexible thermal cell neckband or headband that could, if needed, provide extra power and service area. Thank you for your time.

• Thermal solar cells are indeed more efficient but they are just a way to collect heat, they do not produce electric power, at least not directly like photovoltaics.

Keyboard

Dvorak

To reduce repetitive strain injury, will the units be offered with a Dvorak keyboard layout? It's also a tad easier for non-typists to learn. The rest of the world uses Qwerty, I know, but the rest of the world doesn't have string-powered laptops.

The Dvorak keyboard layout comes standard with Linux. It is not "the rest of the world" that uses QWERTY, just that minority whose languages are written in the Latin alphabet. With variations such as the French AZERTY keyboard, the German QWERTZ keyboard, and so on.

Many writing systems are typed on keyboards that follow the same basic principle as the Dvorak layout, particularly putting all the vowels on one hand (left hand for Indic INSCRIPT keyboards and their relatives, right hand for Korean Hangeul). Ed Cherlin

If the mission of this project is to create educational tools, wouldn't it make sense to arrange the keyboard in an educational manner? In other words - why not arrange the letters alphabetically? I understand alphabetical ordering is not the most effecient but when we're talking about a project that is trying to improve literacy I think improving the education value of the tool is worth sacrificing typing speed. If the keyboard was alphabetical, think how many kids would learn the alphabet without even turning the machine on!

No. That is a grotesquely inefficient layout. Nothing prevents a school from having an alphabet on the wall, as is often done in developed countries. They'll just have to write it themselves in many cases, instead of buying a fancy one from a school supply house.--Mokurai 02:23, 13 October 2006 (EDT)

ARE the monitor and keyboard DETACHABLE??

In poor countries (and not only), exchanging components could be very useful... You can't imagine how useful! For instance, when some kid's monitor is dead, but the rest of the computer still works fine, it would be WONDERFUL if that kid could get a monitor from another kid whose monitor is still working but the rest of the computer is not.

Fortunately, the laptops have been designed so that parts can be replaced with simple tools. It will be the responsibility of each country's ministry of education to maintain spare parts depots and fix the laptops.

We cannot make the units separate because our core idea is to provide an electronic textbook/notebook for the kids. Even though there is a PC underneath the hood, the core concept is for a single device, an e-book that kids can carry with them easily.

QWERTY

I'm in love with the one laptop project, but are we really going to spread the evil and slow QWERTY keyboard to the rest of the world? This must be the ultimate opportunity to introduce a keyboard that has an effective interface. Why not take the opportunity?

Physical Attributes

FormFactor

Why did OLPC go with the laptop form instead of a slate form or something like the Dynabook mockup, Speak&Spell or Pepper Pad? When could this become available?

We are using a transformer hinge that allows the children to use the machine in both laptop and tablet modes. --Walter 08:58, 16 August 2006 (EDT)

Laptop Size

The laptops appear to be sized for five to ten year olds. Do you plan to make a size that would be right for high school students and teachers?

How much will the laptops weigh?

That is not totally settled. Check the hardware specification page for the latest specs.--Mokurai 02:23, 13 October 2006 (EDT)