USB & OTG giá cực tốt


One day in 1994, seven world-leading giải pháp công nghệ companies sat down & created a new standard for connecting computer peripherals. By "one day," of course I mean, "over the span of several months." But all technicalities aside, the standard that they laid down became the Universal Serial Bus, or USB for short.

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Today, USB is truly a "Universal" standard and you"d be hard-pressed lớn find an electronic device that doesn"t have a USB port of one kind or another. But how do you know which USB cable will fit your device? Hopefully this buying guide will help you find the cable that you need for your next project.

What Does USB Do?

USB cables replace the huge variety of connectors that used lớn be standard for computer peripherals: Parallel ports, DB9 Serial, keyboard và mouse ports, joystick và midi ports... Really, it was getting out of hand. USB simplifies the process of installing và replacing hardware by making all communications adhere to lớn a serial standard which takes place on a twisted pair data cable và identifies the device that"s connected. When you showroom the power & ground connections, you"re left with a simple 4-conductor cable that"s inexpensive lớn make & easy lớn stow.


The USB standard defines the way in which a device talks lớn the host. Unless you"re taking advantage of a brand new standard called "USB On the Go" (USB-OTG) which allows devices limited host capabilities, you"re probably going to lớn be connecting a device directly to a host. A USB device can"t initiate communication, only the host can, so even if you can find the right cable: connecting two devices with no host just doesn"t work. Also, because USB cables carry both power và data, connecting two hosts without a device in-between can be disastrous (causing high-currents, short circuits, even fires).

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What Kinds of Cables are Out There?


99% of host controllers will have a USB-A receptacle, so when you"re looking for a USB cable, you"ll usually be looking for a "USB A-to-something" cable. A lot of the time the USB-A over is assumed, since that"s the connector on most PCs, & cables will be named after the connector on the opposite end. Some smaller hosts use a Mini or Micro receptacle but they usually supply a pigtail adapter to USB-A.


Some cables are also hubs, which allow multiple USB devices lớn be plugged into the same host port. In theory, you can stack these hubs as deep as you want to lớn up to lớn 127 devices, but in practice you need to consider nguồn limitations. Some cables are extension cords, with the plug at one end and the receptacle at the other. There are limits to this as well because of the round-trip signal time of the serial data. It"s suggested that USB cables are kept under 5 meters in length.

There are also some wacky, non-standard USB cables out there so you have to lớn be careful when you"re just plugging things in. Not everything that can be physically connected can be electrically connected.

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What Kind of Cable vị I Need?

The best way khổng lồ answer that question is to take a stroll through the types of USB cable that we sell here at and talk a little bit about what each of them are used for. Let"s get to it!

USB A lớn Mini-B

We have so many of these around the office, it"s crazy. Mini-B is the once-great (now deprecated) standard for portable devices. The Blackberry had it, the Motorola Q had it, but most importantly, the FTDI Basic Breakout still has it.

Despite being discouraged for future devices (in favor of the Micro-B) the Mini-B connector is still fairly common. It"s large enough to solder without too much trouble but small enough to lớn fit in some seriously tight spaces. Along with the FTDI Basic Breakout, here are a few other devices that the USB A to Mini-B cable will connect khổng lồ your computer: XBee Explorer USB

In stock WRL-11812

This is a simple lớn use, USB to serial base unit for the Digi XBee line. This unit works with all XBee modules including the …