Hi. I've been thinking creatively about a little output pin shortage problem, so I've only got myself to blame for this:
I'm trying to run a model motor from an 08M via a L269D using PCM, and for space reasons don't want to go to a larger chip.
Essentially the L269D has two inputs for a motor.
Set one high and one low and the motor runs, set them low and high and it runs in reverse.
Feed PCM to the high input instead and the forward speed can be varied, as the input pulses from low to high
As the 08M only has one PCM output, I reasoned that that if I then set the second input high, the motor would run in reverse and its speed could be varied, using the Space part of the input instead of the Mark part as the pulse, as the first input could be seen as pulsing from low to high.
To my brilliant mind this should work. So far it doesn't. Could someone gently explain how unbrilliant my mind really is?
Thanks, and merry Christmas to you all.
I'm trying to run a model motor from an 08M via a L269D using PCM, and for space reasons don't want to go to a larger chip.
Essentially the L269D has two inputs for a motor.
Set one high and one low and the motor runs, set them low and high and it runs in reverse.
Feed PCM to the high input instead and the forward speed can be varied, as the input pulses from low to high
As the 08M only has one PCM output, I reasoned that that if I then set the second input high, the motor would run in reverse and its speed could be varied, using the Space part of the input instead of the Mark part as the pulse, as the first input could be seen as pulsing from low to high.
To my brilliant mind this should work. So far it doesn't. Could someone gently explain how unbrilliant my mind really is?
Thanks, and merry Christmas to you all.