It makes the Arduino appear as a serial “device” to the “host” PC. The USB port on most Arduinos is just a serial device for loading programs and input/output.
Why would one want a USB host shield when the Arduino already has a USB port? The USB Host shield’s USB port is a “host” port, and is different than the USB “device” port found on the Arduino. It did not let you hook up USB devices to OS-9 (though later, this support was added for flash drives and such).
#Arduino usb host shield mega Pc#
This would let a gadget running OS-9 hook up to a PC so it could talk to it. In the 90s, when I was working for Microware, we were bringing USB support to our OS-9 embedded operating system, but initially were only doing device mode. The computer acts as the host, so it has a USB host port. A printer or thumb drive supports USB device mode. Their product retails for $24.00 (currently $21.60) and it allows the Arduino to act as a “host” and read from other USB devices such as mice, keyboards, etc.įor those unfamiliar with how USB works, there are two types of USB things… USB “device” mode is for something you would plug to a computer so the computer could use it. There is a USB Host Shield sold by iTead Studio in China. (I post this mostly so it will end up in Google search results and maybe save someone the time I wasted trying to figure this out on my own -) From time to time, I will post little tidbits of things I have learned. Thanks to my day job, I got my first exposure to Arduino (as well as other similar devices, like the $4.30 TI 430 Launchpad).
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