The Linuxstamp doesn't need a USB serial adapter as it has the serial ports on the chip. Also the at91rm9200 does have PWM channels that should be capable of generating the signal for a servo directly, but I haven't messed with that. thanks, Paul On Fri, Mar 13, 2009 at 3:51 PM, Daniel Lelis Baggio <danielbaggio@xxxxxxxxx> wrote: > Hi Paul, > > thanks for your suggestion. But my first idea was to make it for a > computer without serial port output. > Then you could say that I just need an usb to serial adapter. > Well, it could be an idea, but I feel it seems embarrassing not be > able to communicate to the out world without buying external circuits. > I mean, we could do it back in 90's without a problem just writing to > parallel port addresses. It seems I cannot even turn a led on (and > off, ;) ) without using an integrated circuit out there. > > If anyone could tell me how to do this simple thing without a > controller out there, I'd be pleased. > > Thanks Paul, > best regards > > On Fri, Mar 13, 2009 at 7:40 PM, Paul Thomas <pthomas8589@xxxxxxxxx> wrote: >> Daniel, >> >> What's wrong with serial? Like this http://opencircuits.com/Linuxstamp#Servos >> >> thanks, >> Paul >> >> On Fri, Mar 13, 2009 at 3:36 PM, Daniel Lelis Baggio >> <danielbaggio@xxxxxxxxx> wrote: >>> Hi, >>> >>> I would like to know if it is possible to plug a servo to USB by >>> directly attaching the usb host data out to the servo control channel, >>> through a host generated pwm (digital signal output). >>> As usb requires a handshake and there would be no response from the >>> USB device (since it would be a dummy device, that would only read the >>> usb host signal), I would like to know if we can make the usb host >>> controller believe that the servo has answered the enumeration >>> (through a fake usb signal we would generate in the computer) and then >>> start sending the data to the servo, just like we used to do in >>> parallel ports (I mean, I know it's not parallel, but there was no >>> need to get feedback from the device in parallel ports if we didn't >>> want to). >>> >>> Thanks in advance, >>> Daniel >>> >>> -- >>> =================================================== >>> Daniel Lelis Baggio danielbaggio@xxxxxxxxx >>> >>> URL: danielbaggio.blogspot.com >>> PGP key: 0x49C123B6 @ http://keyserver.ubuntu.com:11371 >>> =================================================== >>> -- >>> To unsubscribe from this list: send the line "unsubscribe linux-usb" in >>> the body of a message to majordomo@xxxxxxxxxxxxxxx >>> More majordomo info at http://vger.kernel.org/majordomo-info.html >>> >> > > > > -- > =================================================== > Daniel Lelis Baggio danielbaggio@xxxxxxxxx > > URL: danielbaggio.blogspot.com > PGP key: 0x49C123B6 @ http://keyserver.ubuntu.com:11371 > =================================================== > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
