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] <javascript:>> > 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] <javascript:>. >> 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. 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