I am not sure how to take that!Not sure if it is luck or something else. Gerald
On Thu, Mar 6, 2014 at 9:12 AM, Eric Palmer <e...@ericfpalmer.com> wrote: > Awesome > > Gerald we are lucky to have you on this mail list and be participating so > much. > > Thanks > > > On Thu, Mar 6, 2014 at 10:09 AM, Gerald Coley <ger...@beagleboard.org>wrote: > >> Yes you can do that Use the 3.3V to enable the regulators. >> >> Gerald >> >> >> >> On Thu, Mar 6, 2014 at 9:03 AM, Matthew Witherwax <ablec...@gmail.com>wrote: >> >>> Thanks Gerald. That is exactly the response I was expecting and exactly >>> the feeling I had. Never really like playing Russian roulette myself. Do >>> you see any issue with powering the sensors via a voltage regulator like >>> http://www.pololu.com/product/2098 that can be turned on via a pin on >>> the BBB once it is up and running? >>> >>> >>> On Thu, Mar 6, 2014 at 8:58 AM, Gerald Coley <ger...@beagleboard.org>wrote: >>> >>>> I put that in there for a reason. It may not happen all the time, but >>>> eventually you could blow up the processor. >>>> >>>> Gerald >>>> >>>> >>>> On Thu, Mar 6, 2014 at 8:56 AM, Matthew Witherwax >>>> <ablec...@gmail.com>wrote: >>>> >>>>> As part of the Control of Mobile Robotics class offered through >>>>> Cousera, the students are building robots based around the BeagleBone >>>>> Black. The robot has 5 infrared distance sensors and 2 reflectance >>>>> sensors >>>>> used for odometry. These sensors are connected via voltage dividers to >>>>> pins 33, 35, 36, 37, 38, 39, and 49 of P9, and are powered from the same >>>>> power supply used to power the BeagleBone Black. The System Manual has a >>>>> rather explicit warning: >>>>> >>>>> NOTE: DO NOT APPLY VOLTAGE TO ANY I/O PIN WHEN POWER IS NOT SUPPLIED >>>>> TO THE BOARD. IT WILL DAMAGE THE PROCESSOR AND VOID THE WARRANTY. >>>>> NO PINS ARE TO BE DRIVEN UNTIL AFTER THE SYS_RESET LINE GOES HIGH. >>>>> >>>>> My concern is the current arrangement would allow the sensors to begin >>>>> driving the pins before the SYS_RESET line goes high; however, I am a >>>>> software guy just starting down the hardware path. Thus far many in the >>>>> class have been using the robot without issue. Is my concern invalid? >>>>> >>>>> Thank you for your time. >>>>> >>>>> -- >>>>> 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/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/_5Puwswy-RQ/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> beagleboard+unsubscr...@googlegroups.com. >>>> >>>> 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 beagleboard+unsubscr...@googlegroups.com. >>> 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 beagleboard+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> > > > > -- > Eric Palmer > > -- > 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/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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
