Thank you to Ricardo for clarifying what is needed for mobile phones with USB ports to function as Includers.
July 2, 2009: Hi Andrius, Thanks for posting about the EU standardising the phone chargers across all new phones in Europe. You suggested making it the subject of Pam’s first Thursday of the month chat. I’m sorry, but I didn’t see your message until Thursday afternoon, after the 1 PM chat time, so here’s a few thoughts.
From news articles, the manufacturers intend to standardise on micro-USB sized connectors. USB from a charger will provide power at 5 Volts. The standardisation is a voluntary agreement, not EU law. However, all the major manufacturers have signed up, and I expect it will drive all the other countries to adopt the same standard.
Micro-USB is electrically the same as USB or mini-USB, but physically smaller, to allow for thin phones.
Wikipedia has this article about USB (Universal Serial Bus).
You suggested this standardisation (a USB Slave socket) would allow phones to control peripherals. Actually, that’s not enough on it’s own. There’s a technical detail you need to be aware of. When two devices communicate by USB cable, one device is the Master and the other is the Slave. It’s also sometimes called Host and Device. The Master initiates and controls the conversation.
USB carries power on 2 wires (0V and 5V) and data on 2 wires (Data+ and Data-).
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Phones using the new EU standard charger just need a micro-USB Slave connector, to receive power.
When I submitted my idea to Google 10100 competition, I was suggesting that phones should have a USB Master socket, to control USB Peripherals, such as flash drives, cameras, printers, portable hard drives, etc (not a slave socket). A USB Master socket would make every phone into a mini-PC/laptop, the heart of a computer system, able to control peripherals.
If the phone is a GPRS phone, it would also provide this computer system with internet connectivity, but even simple non-internet phones could send SMSs to a USB printer or send/recieve files to a flash drive.
The easy way to acheive this is to make use of a new-ish style of USB called ‘USB On-The-Go’ or USB OTG. In USB On-The-Go, either of the 2 communicating USB devices can be the master and control the conversation. They negotiate who will be in charge. A device can be a master or slave at different times. So, when charging, a phone could be a USB Slave. When acting like a small computer (to control printers etc), the phone could be a USB Master. на видео телефон бесплатно порно
I’m still waiting to hear when the results of the Google 10100 competition will be announced. They should send an email to everyone that registered. I’ll let you know when I hear anything.
July 14, 2009: Andrius: Just to make sure that I understand you… There’s a hardware difference between the Master USB and the Slave USB, yes? (I suppose they have different chips.) But the port is the same, yes? So that would mean that the phones will now have the relevant form factor and just need to have a better chip? It’s still a step forward perhaps?
July 16, 2009: The EU plans for all phones to use micro-USB connectors for recharging and data only still sees phones as slave devices to a PC. The plan covers the phones working as a USB Slave, controlled by a PC USB Master for read/writing files to the phone, or charged from a 240V mains PSU with USB 5V master socket. The plan doesn’t force the phone-manufacturers to include USB Master capability, to control printers and other peripherals.
In the future, I hope more phones could be designed with USB Master capability, either with a second socket for old-style USB Master-only purposes, or more-likely using a single socket as a Master/Slave USB On-The-Go (OTG) device ,and acting at times as a USB Master controlling peripherals, and at other times as a slave device, controlled by a PC.
The 2 USB devices that communicate can each be designed with 3 sizes of connector; full-size USB, mini-USB and micro-USB. Generally, the 2 equipments have sockets and the cables have plugs on each end. A PC would be connected to an EU-standard phone via a USB-to-micro-USB cable.
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USB Master and Slave (otherwise known as Host and Device) sockets use different circuitry.
USB is a 4-wire connection.
2 wires are used for TX and RX Data. The data-transfer is bi-directional, but the ‘conversation’ is started and controlled by the Master device, such as a PC.
2 wires are used for 5V and 0V, to supply power from the Master to the Slave. It can be up to 500mA. The slave device signals how much current it needs, either an exact amount (generally below 100mA) or in steps going up from 100mA, 200mA – 500mA. Low power devices like a mouse or flash drive use 100mA or less. High power devices like a USB printer, that need over 500mA have their own 240v/110v mains power supply.
The master device senses when a slave device is plugged in. I think it senses when current is drawn. I think some dumb devices that just want USB 5V power, just have a resistor to ground with the right resistance-value to indicate how much current they want (100mA, 200mA, etc).
The physical connectors are sockets that can be full-size USB connectors, mini-USB or micro-USB size. For a camera or phone, you often use a full-size USB to mini-USB cable.
Some expensive smartphones now have a mini or micro-USB socket, and use USB On-The-Go (OTG), where either device can start and control the conversation (data-transfer). This means the phone can choose to be the Master and control a USB Slave device, such as a printer. I would like to see phone manufacturers include USB OTG in every phone model, even the cheap phones used by many people in developing countries.
The question is…
Even if a phone has USB OTG, can it control a wide range of USB peripheral devices, such as USB flash-drives, memory card readers, QWERTY Keyboard, mouse, joystick, drawing tablet, USB hard drives, printers, cameras, other people’s cheaper USB-slave phones, etc?
Well, it depends on having software drivers that work on the particular phone Operating System, such as Nokia Symbian S60, for each device that you want to use (printer, etc) .
A few drivers are available already, I think, otherwise nobody could use the existing smartphone USB OTG facility. I’ll have to research which device drivers are available. Hopefully, when a lot of of phones have USB OTG, more device drivers will become available, then things will reach a point where most users demand that printer-manufacturers etc provide phone software drivers for popular phone Operating Systems.
You can check which phones have USB OTG, now and in the future, by doing a free-text search for OTG on the GSMArena phone-finder website, Advanced Search page…
At the moment, the only models it finds are Nokia 8800 Arte and Nokia Carbon/Sapphire/Gold Arte.
All the Nokia Arte models have a Micro-USB and master/slave USB OTG capability…
I’ll look into what peripherals they can control at the moment. For printers, each printer-model may not need it’s own driver, as the phone and printer could probably communicate by USB using the PictBridge standard (also available over Bluetooth and Infrared to some printers).
For Includer work, the most useful device-driver would be a standard driver for each phone OS that lets a phone read/write files to a USB flash-drive. A USB memory-card holder would make memory cards look like a flash-drive and allow the phone to read/write files to/from memory cards from older non-USB phones and cameras.
That means that having just one GPRS phone with USB OTG in an area, would interface the whole local sneakernet-by-flash-drive/memory-card community to the internet, for email, file uploads/downloads, sending photos, etc. You don’t need a PC, Laptop or trips to a Cyber-Cafe.
Here is more info on USB and USB OTG and see also Wikipedia. порно ножки