On Mon, 11 May 2020 10:10:50 -0700 (PDT), in gmane.comp.hardware.beagleboard.user jfiore-cgpx1inf...@public.gmane.org wrote:
>I am trying to find a way to use the beaglebone blue for bidirectional >power flow. I need a connected DC motor to act passive as well as active at >different times. Can the beaglebone blue do this, and if so how does it >work? To me "passive" DC motor implies it is being driven in reverse; that is, the shaft is being spun by some external force, and the wiring is producing a voltage (acting as a generator). Obviously, that would be unsafe on most Beaglebone GPIOs due to the risk of exceeding 3.3V limit. However, a Google search finds this https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=2ahUKEwi9q7KMiK3pAhUNUa0KHTt1D5EQFjACegQIBhAB&url=https%3A%2F%2Fapm.iitm.ac.in%2Fbiomedical%2Ftouchlab%2Fpapers%2FDCMotorDamping.pdf&usg=AOvVaw3BCcXZjRyGDN6Nat5M4ppT which indicates that a particular H-Bridge configuration is needed to put a motor into a "braking" mode. If using the Blue's H-bridges, and the Robot Control Library, then this would be done by invoking rc_motor_brake() http://strawsondesign.com/docs/librobotcontrol/group___motor.html#ga470369dde3e084f0a2a5c99db61f9494 (vs rc_motor_free_spin() to coast). -- Dennis L Bieber -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/4grjbft75h206aonu8rv2q949d3dqkap2f%404ax.com.