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.
