These transistors, they are active low. We can only sink and drive 6mA. You could try adding a pullups to each signal to pull the voltage higher, Tie then to 3.3V.
Gerald On Mon, Jul 7, 2014 at 2:51 PM, <coloneedes...@gmail.com> wrote: > http://www.wlelectronix.com/Content/Images/uploaded/Relay%208%20Way_2.png > My relay module is must be something like this. > Relays are 5v, so i use VDD_5V(P9_05) to drive them. GPIO turns on and off > them in normal. But there is a problem in my situation. I'm trying to find > it. > > 7 Temmuz 2014 Pazartesi 15:58:52 UTC+3 tarihinde Gerald yazdı: >> >> I can't tell much from a picture. Doe sit have a schematic, or a link to >> one? >> >> If the relays are 5V, then you cannot drive them from a GPIO as it is >> 3.3V and delivers only about 6mA.. Connecting 5V will blow the processor. >> You would need a level shifter such as a transistor to drive the relay.. >> >> >> Gerald >> >> >> >> >> On Mon, Jul 7, 2014 at 7:37 AM, <colone...@gmail.com> wrote: >> >>> Hello, >>> I'm trying to use relay module with beaglebone black. >>> I bought relay module from china. >>> It is very similar to this: http://www.hobbyist.co.nz/ >>> sites/default/files/8ChannelRelay_small%20%28Custom%29.jpg >>> I have connected VCC to BBB's VDD_5V(P9_05) and GND to BBB's >>> DGNG(P9_01). >>> Here is the problem: >>> When I connect any gpio port to relay module's any signal pin, relay is >>> starting to work. >>> Even GPIO is high or low I can't switch off the relay. So I can't >>> control any relay from BBB. >>> What can I do to solve this problem? >>> Many thanks. >>> Note: I tried relay module with external power source but results are >>> same. >>> >>> -- >>> 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 beagleboard...@googlegroups.com. >>> >>> 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 beagleboard+unsubscr...@googlegroups.com. > 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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
