You guys are great. I'm going out of town for the weekend so I've ordered a couple of the parts suggested to give it a try. Should be here when I get back.
Thanks! Dan On Thu, Feb 14, 2019 at 1:20 PM Mala Dies <[email protected]> wrote: > Hello, > > While reviewing this info. you provided, an optocoupler might just work. I > found a site that sells them but I also found on that site, some datasheet. > See here for the datasheet: > https://www.analog.com/media/en/technical-documentation/data-sheets/ADuM1200_1201.pdf > . > > Seth > > P.S. I have not tried this conversion yet so my mind would say take time. > Do not rush if possible. Oh and from what I understand, the optocoupler > works by shutting off instead of transferring the signal any further. The > DigiKey site has some and I found one that is unidirectional: > https://www.digikey.com/product-detail/en/analog-devices-inc/ADUM1201AR/ADUM1201AR-ND/725709&?gclid=CjwKCAiAwJTjBRBhEiwA56V7q0A4N0DBiSwt5Wm4ahl6pdiosiiP-YLgdJr-Y9oH2wYF3XcMOvw7FBoCLmoQAvD_BwE. > That datasheet above is the sheet for this link. > > On Wednesday, February 13, 2019 at 8:57:09 PM UTC-6, Dan Hammans wrote: >> >> I'm kind of at a standstill. I found a circuit design to use a transistor >> to take a 3.3v input, and switch on the 5v for the GPS but then while doing >> more reading someone said that was a really bad idea because they weren't >> opto-isolated. I didn't really know what that was, but after reading it >> makes a little more sense. If the transistor fails or is otherwise damaged, >> it could end up feeding 5v into the 3.3v section of the Beagleboard and fry >> it. >> >> I was looking for an opto-isolated transistor relay, found one but >> haven't gotten one ordered yet to try it out. >> >> That's pretty much the status, I was going to try and talk to an >> electrical engineer friend of mine to see what he thought of the situation. >> What do you think? >> >> Thanks, >> Dan >> >> On Wed, Feb 13, 2019 at 8:17 PM Mala Dies <[email protected]> wrote: >> >>> Hey Man, >>> >>> Seth here. Did you ever figure out the issue w/ setting up a GPIO pin to >>> control the 5v for your GPS? >>> >>> Seth >>> >>> On Sunday, February 10, 2019 at 12:38:52 AM UTC-6, Dan Hammans wrote: >>>> >>>> No apologies needed, I'm just trying to figure this out. What I meant >>>> was using a GPIO pin to trigger the relay/transistor which would then >>>> switch on +5v. >>>> >>>> I'll take a look at the links above, appreciate your help! >>>> >>>> On Saturday, February 9, 2019 at 11:58:08 PM UTC-6, Mala Dies wrote: >>>>> >>>>> Sir, >>>>> >>>>> I just found a source for ideas: >>>>> https://next-hack.com/index.php/2017/09/15/how-to-interface-a-5v-output-to-a-3-3v-input/. >>>>> Adding a button and software could prove valuable. If anything, it may >>>>> help >>>>> a bit. >>>>> >>>>> Seth >>>>> >>>>> P.S. GPIO works for buttons, LEDs, and other circuitry. I am sure you >>>>> know how to do things. I was trying to latch on to learn more. Sorry. >>>>> >>>>> On Saturday, February 9, 2019 at 11:19:47 PM UTC-6, Dan Hammans wrote: >>>>>> >>>>>> Hi Seth, I really appreciate the reply. >>>>>> >>>>>> I was afraid of that. My GPS module requires +5v. Is there another >>>>>> +5v source on the board that is switched off when the board powers down? >>>>>> What about the black power connector above the GPS UART port? >>>>>> >>>>>> Otherwise it looks like I will be building a resistor circuit and >>>>>> triggering it from a GPIO pin. >>>>>> >>>>>> On Saturday, February 9, 2019 at 11:07:14 PM UTC-6, Mala Dies wrote: >>>>>>> >>>>>>> Sir, >>>>>>> >>>>>>> Seth here. I just got done dealing w/ someone on this subject. The >>>>>>> 5v pin from the GPS connection cannot be "un"powered. It stays powered >>>>>>> on >>>>>>> while the board has power. >>>>>>> >>>>>>> Seth >>>>>>> >>>>>>> P.S. Try UART instead at 3.3v. This may help. >>>>>>> >>>>>>> On Saturday, February 9, 2019 at 2:58:12 AM UTC-6, Dan Hammans wrote: >>>>>>>> >>>>>>>> I'm not sure that I understand the difference between the >>>>>>>> Beagleboard forum and the Beaglebone forum, but thought I would try >>>>>>>> posting >>>>>>>> here as well. >>>>>>>> >>>>>>>> I have a Beaglebone Blue connected to a GPS module via the GPS >>>>>>>> micro JST connector. I selected this one because it has +5v, which is >>>>>>>> what >>>>>>>> is needed for my GPS as opposed to 3.3v on the other UARTs. >>>>>>>> >>>>>>>> The GPS module works correctly, but my issue is I can't power it >>>>>>>> down. It's been suggested that the 5v rail can't be shut down with the >>>>>>>> battery connected, but that seems rather odd to me. The also suggested >>>>>>>> solution was to use a transistor to switch 5v power via a 3.3v GPIO >>>>>>>> pin. I >>>>>>>> suppose that's a solution but not a very elegant one if the board can >>>>>>>> be >>>>>>>> somehow configured to power off the 5v rail. It seems like this should >>>>>>>> be >>>>>>>> possible, albiet not easily accessible. There doesn't seem to be >>>>>>>> much/any >>>>>>>> documentation available about this at all. >>>>>>>> >>>>>>>> I made a Youtube video showing what's going on; >>>>>>>> https://www.youtube.com/watch?v=9xrXKRy97Yk >>>>>>>> >>>>>>>> Any suggestions appreciated, otherwise I think I'm going to have to >>>>>>>> go down the path of the transistor relay... >>>>>>>> >>>>>>>> >>>>>>>> -- >>> 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]. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/beagleboard/a081d618-f75a-4343-9fb1-501aec0421a8%40googlegroups.com >>> <https://groups.google.com/d/msgid/beagleboard/a081d618-f75a-4343-9fb1-501aec0421a8%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> 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]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/beagleboard/9d44d98c-b736-4706-9c9d-2bb917096bf6%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/9d44d98c-b736-4706-9c9d-2bb917096bf6%40googlegroups.com?utm_medium=email&utm_source=footer> > . > 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAHabsPSrOAT_p9xoWNhDNCV84vo1qxy6PchrM_PxdFhDF_KbvQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
