I'm glad it works, but the second circuit uses a BJT not a N-Channel MOSFET. If you are using the relay board from the ebay link it already comes with the N-Channel MOSFET you need for switching the relay with a 5V source. So I'm confused as to why you would use a BJT circuit. Just wondering?
On Tue, Nov 12, 2013 at 9:12 AM, Bodo Kaiser <[email protected]> wrote: > Hi, > > solved the problem by using following circuit: > http://electronics.stackexchange.com/questions/56093/how-to-use-a-3v-output-to-control-a-5v-relay(the > second one - first did not work…) > > I used a 500 Ohm resistence. > > > Am 12.11.2013 um 16:09 schrieb Cody Lacey <[email protected]>: > > I'm not completely sure what you are asking. Are you wondering if the > 3.3V from the Black is enough to switch the transistor? > > > On Mon, Nov 11, 2013 at 9:48 PM, <[email protected]> wrote: > >> Hi! It just so happens that my IEEE<https://www.facebook.com/byuidahoieee> >> group >> here at BYU-Idaho are putting together a flight computer for a rocket and >> used this to deploy our recovery system: >> >> >> http://www.ebay.com/itm/221292380580?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 >> >> I can upload a schematic later but the idea is to have a 9V battery power >> the transistor which is triggered from an I/O pin from the BBB. This >> battery also supplies the current to switch the relay after the I/O pin is >> triggered. If your current draw is low enough, a transistor would work, >> but the BBB GPI/O pins output 3.3 V or you could use a 5V output pin that >> the board supplies to get the 5V directly. >> >> >> On Sunday, November 10, 2013 8:39:12 AM UTC-7, Bodo Kaiser wrote: >>> >>> Hello, >>> >>> I want to control a 5V battery-powered circuit through a relay. >>> >>> I am quite unsure which will work with the BeagleBoneBlack and a simple >>> GPIO input. >>> >>> Are there any recommendations? >>> >>> Best, >>> Bo >>> >> >> -- >> 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/groups/opt_out. >> > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/beagleboard/8cSfDP2zvII/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > > For more options, visit https://groups.google.com/groups/opt_out. > > > -- > 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/groups/opt_out. > -- 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/groups/opt_out.
