Look, I'm no EE, but do things the right way . . . if you start putting too much current or voltage on the wrong pins. You'll end up frying the processor. Then no doubt start telling the BBB is garbage because you were not up to the task of using it . . .
On Fri, Oct 9, 2015 at 4:51 PM, <[email protected]> wrote: > Depending on exactly what is needed (current draw, etc), there is a way to > generate a 5V pulse without a transistor. I didn't see any specs on what is > needed in this thread so be sure to verify what you are doing against the > specs of all the components involved. > > The VBUS line on the USB host side does have a control on there already. > There > should be some debug control on the USB block. > > > On Friday, October 09, 2015 19:32:10 Harvey White wrote: > > On Fri, 9 Oct 2015 12:58:10 -0700 (PDT), you wrote: > > >Thanks, so it basically seems there is not a way of getting a pulse of > 5V > > >without using a transistor. Oh well. > > > > The I/O on a 3.3 volt processor goes between 0 and 3.3 volts. To get > > any other (larger) voltage, you'll need at least a transistor. > > > > Harvey > > > > >On Friday, October 9, 2015 at 2:44:38 PM UTC-4, TJF wrote: > > >> The CPU on BBB is powered by 3V3. This means all digital output (GPIO, > > >> PWM, ...) will be at 3V3 as well. > > >> > > >> In order to get a 5V pulse train, you'll need an external driver. I > use > > >> darlington arrays for that purpose, like ULN2804 > > >> < > http://html.alldatasheet.com/html-pdf/55062/ALLEGRO/ULN2804/246/1/ULN280 > > >> 4.html> . > > >> > > >> BR > > -- > Hunyue Yau > http://www.hy-research.com/ > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
