Arduino USBtinyISP 2.0（Arduino Compatible）
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Introduction ：
This is documentation for a simple open-source USB AVR programmer and SPI interface. It is low cost, easy to make, works great with avrdude, is AVRStudio-compatible and tested under Windows, Linux and MacOS X. Perfect for students and beginners, or as a backup programmer.
The project is based off of the USBtiny code & design. The main improvements are: adjusting the code to allow it to act as a SpokePOV interface, adding lowlevel bitbang commands, and addition of a "USB good" LED. Other changes are new VID/PID (to make it official), removing some of the commands, and moving around the pins a bit.
You can build this design using the schematic and firmware. Having a full kit available solves the "chicken & egg" problem of purchasing or building a USB programmer that then needs a programmer of some sort to 'kick start'. (See USBasp, AVRdoper, USBprog)
All the firmware code is distributed under the GPL, the hardware design layout files are CC 2.5 Attrib./Share-alike
Description
Easy to make：
2、Kit comes with both 6-pin and 10-pin AVR-standard connectors and cables.
Almost no programmers that are not from Atmel have both!
(Including the AVRISP v2)
3、Easy to build: All through-hole parts, all common and available from large distributors
Easy to use：
2、USB drivers available for Windows using libusb, no drivers needed for Mac OS X
or Linux.
3、Durable off-the-shelf enclosure
4、High speed! Max clock rate is 400KHz. Write speed:1Kb/s, read speed: 2Kb/s.
(Atmega8 takes 8s to write, 4s to read/verify)
5、2 LEDs to indicate "USB/Power good" and "Busy"
6、I/O is buffered to allow programming of 2V-6V targets (v2)
Easy to power：
unpowered USB hubs
2、Easily accessable jumper to power target project off of USB
(target must be 5V tolerant, of course)
3、Remove the jumper and it will self-power but buffer the I/O to match
the target device. (v2)
Easy to extend：
2、Existing firmware allows for fast SPI interfacing using USB
3、Bit-bang commands provide 8 bits of I/O control (including LED) for
open-ended project ideas
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