The analog input AIN7 is connected on-board to the 3.3V power line over a 50/50 voltage divider. Just get the input of AIN7 to measure the (half) board voltage.
One solution to fetch AIN7 inputs is libpruio <http://beagleboard.org/project/libpruio/>. Check out the (pre-compiled) examples, ie trigger <http://users.freebasic-portal.de/tjf/Projekte/libpruio/doc/html/ChaExamples.html#SubExaTriggers> to show a graph of the inputs at AIN4 and AIN7 in a window. Or example 1 <http://users.freebasic-portal.de/tjf/Projekte/libpruio/doc/html/ChaExamples.html#SecExaSimple>, which exports 13 lines of sampled ADC values. AIN7 is in the last column, scaled as 16 bit value (*0xEE40* * 2 * 1.8 V / (4095 * 16) = 3.35 V) Am Donnerstag, 17. Juli 2014 00:39:37 UTC+2 schrieb chris...@gmail.com: > > Hi, > > Is there a way to measure a BBB's supply voltage from within the Linux OS? > I was thinking about connecting one of the VDD_3V3 pins to a analog GPIO > input and measuring that but I'm not sure if that's a good idea or even > possible. > > Thanks, > > Chris > -- 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.
