Mr. Dennis,
Seth here again. I got the software changed to P9_22 and tested the change
in pin at P9_22. It makes the LED blink on and off repeatedly until I use
control-c.
Seth
P.S. Now, I read what you described. Thank you for the "En" ideas and info.
I will try to dedicate some time to promoting this to software.
On Thursday, May 3, 2018 at 9:06:04 PM UTC-5, Mala Dies wrote:
>
> 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
>> <[email protected]> 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
>> [email protected] HTTP://wlfraed.home.netcom.com/
>>
>>
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