Hi, Thank you for your reply.
Headers; J1-J2-J3-J4-J5-J6-J7-J8-J18-J19-J20 / headers of valves, J17 / header of pump, J12-J13 / headers of digital input, J9-J10 / headers of 12 volt and ground, J14 / header of analog input. Grounds are not tied together because high current switch is occur in our valve circuit. We separate 12 volt's ground and 5 V's ground. AIN4 and AIN6 pins voltage comes from analog sensor. They are certainly less than 1.8 volt. Could i use a load switch to solve the problem (The 3.3V cannot come up before the processor comes up) ? And is there any problem to give voltage(5 Volt) to P9_5 and P9_6 while it's turned off? Thanks, Ugur On Tuesday, April 29, 2014 6:09:52 PM UTC+3, Gerald wrote: > > I see lots of issues. Can you show what you have connected to what on your > headers? > > Your 3.3V and 5V rails are on all the time. I suggest you take a look at > the SRM to see how to handle the power. The 3.3V cannot come up before > the processor comes up. You are violating that rule. > http://www.elinux.org/Beagleboard:BeagleBoneBlack#Expansion_Header_Usage > > Any reason your grounds are not tied together? > > What voltage do you have coming into the AIN4 and AIN6 signals? > > > Gerald > > > > On Tue, Apr 29, 2014 at 9:54 AM, <[email protected] <javascript:>> wrote: > >> Hi guys, >> >> I run 12V valves(insulated channels) and read pressure values by I2C with >> my BBB board. I don't understand what has happened but two BBB were broke >> down with this board. >> >> When i am plugging in my power supply; one of the broken BBB's LED is not >> work, the other one's LED is on but does not open. >> >> I wonder if is there any mistake(shortage) in my board? >> >> There are the board's layout and schematic; >> https://www.dropbox.com/s/tu3go2uei8ikryp/valf_layout.pdf >> https://www.dropbox.com/s/dpziyloas6bttpl/Valf_schematic.PDF >> >> Thanks for your help in advance. >> >> Regards, >> Ugur >> >> -- >> 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:>. >> 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]. For more options, visit https://groups.google.com/d/optout.
