Thanks Ytai you guessed correctly. I will investigate the easiest option first. I guess 3.3 may be sufficient.
On Sat, Jan 18, 2014 at 1:09 AM, Ytai Ben-Tsvi <[email protected]> wrote: > When the IOIO is not connected, all its pins are floating. > The answer to your questions depends on what you're actually trying to > accomplish. > If I may second-guess from your question, you are probably trying to > generate a 5V digital output and you want its default state to be LOW. > > What you can do about this is either: > > - Easiest: do you actually NEED a 5V signal on the output? If your > device can function OK with 3.3V, then all you would need is to use the pin > in push-pull ("normal") more, and have a weak pull-down resistor on your > signal. > - Otherwise, add a p-channel FET on your output and configure it to > have the correct default state (using a pull-up to 5V on the gate and a > pull-down on the output). This will have a side effect of inverting your > signal, which can easily be mitigated in software. > > > > On Fri, Jan 17, 2014 at 2:07 PM, Peakon <[email protected]> wrote: > >> Sorry small correction it is 5V not 3V when IOIO is not connected. >> >> On Friday, 17 January 2014 21:50:37 UTC, Peakon wrote: >>> >>> Hi, >>> >>> I use 5 GPIO pins in open drain mode as outlined in IOIO wiki. When IOIO >>> is switched on but not connected I could measure about 3 V on the pins. How >>> can I set them as low (0V ) when IOIO is not connected? >>> >>> Eddie >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "ioio-users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/ioio-users. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > -- > You received this message because you are subscribed to the Google Groups > "ioio-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/ioio-users. > For more options, visit https://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "ioio-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/ioio-users. For more options, visit https://groups.google.com/groups/opt_out.
