Hello Sir, Seth here. Otay! LED hooked up and running on and off. Here is the software:
import Adafruit_BBIO.GPIO as GPIO import time GPIO.setup("P9_21", GPIO.OUT) while True: GPIO.output("P9_21", GPIO.HIGH) time.sleep(3) GPIO.output("P9_21", GPIO.LOW) time.sleep(5) I hooked up the P9_21 pin. Now, off to test P9_22. I will let you know. Seth On Thursday, May 3, 2018 at 8:32:52 PM UTC-5, Dennis Lee Bieber wrote: > > On Thu, 3 May 2018 15:06:55 -0700 (PDT), Mala Dies > <fun...@gmail.com <javascript:>> declaimed the following: > > > > >P.S. I understood what you typed in your last e-mail post in this forum > on > >this subject. I was not expecting any certain outcome. I was testing > >software w/ this motor driver to see if things would just make the motors > >turn. It is that simple. Now, if the motors did turn and the recorded > >effect was pleasing, I would not have to change anything. But, if the > >motors turned incorrectly for me, I would then investigate further what I > >could do w/ the software to change this fact. > > > > Take the motor controller out of the equation... > > Run the GPIO through a decent resistor and LED (high side to GPIO, > low > side to GND -- so the LED glows when the GPIO is set HIGH). Look at any > decent source for examples of LEDs from BBB (since the BBB has such low > power-handling you need to ensure the LED doesn't draw too much current). > > > http://www.toptechboy.com/beaglevone-black-rev-c/beaglebone-black-lesson-5-blinking-leds-from-gpio-pins/ > > > Watch the LEDs -- if they don't change when running your code, > then > either you are not commanding the GPIOs or your GPIO pins are > damaged/dead. > > Until you can see the GPIO LEDs changing with commands in your > program, > anything else is irrelevant! > > Then you can get fancier -- wire a pair of LEDs in opposite > directions > (pick a green and a red) OR find a dual-color LED as used in > http://www.instructables.com/id/The-RedGreen-LED-Guide/ > and then connect (with resistor) to the two GPIOs you intend to use for > one > motor. Basically, this configuration will have the LED OFF if both pins > are > the same state (motor stopped) and will show either green or red depending > on the direction you are driving the motor. > > > ---- > > As for the Enable pins... The spec sheet has some confusingly > nasty > comment > > """ > Turn-On and Turn-Off : Before to Turn-ON the Supply Voltage and before to > Turn it OFF, the Enable input must be driven to the Low state. > """ > > Taken literally, you can't just jumper them. You will need (at > least) 1 > GPIO (you could tie it to both En-A and En-B to toggle them both at the > same time) and set it HIGH before controlling the drive inputs. > > You then need to set the inputs for a motor to OPPOSITE states to > drive > the motor -- setting both to the same state is a STOP condition. That > means > you need one input HIGH and the other input LOW /per controller channel/. > See the table in figure 6 (of the Sparkfun link, though I think both were > the same document). > > En=HIGH, "C"=HIGH, "D"=LOW => "Forward" > En=HIGH, "C"=LOW, "D"=HIGH => "Reverse" > En=HIGH, "C" and "D" both HIGH OR LOW => HARD STOP > En=LOW, "C" and "D" can be anything => Soft/coast STOP > > Presuming you use one GPIO for both ENables, you need five total > GPIOs > to handle two motors. > > > -- > Wulfraed Dennis Lee Bieber AF6VN > wlf...@ix.netcom.com <javascript:> > HTTP://wlfraed.home.netcom.com/ > > -- 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/73710d99-7cb6-4e5f-bdb7-16ce49dc463d%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.