Awesome, gonna get on this tonight! Thanks DJ!

DJ: I read over your script and see what you have done, but I have a question along the same lines, except I want to control two small motors in the wrists on my robots arms to rotate the hands. But instead of using the arrow keys, how do I go about using the voice command to do it. I know how to do it using servos, but I can not get servos small enough for this porpose , so I have to use Small gear motors which requires a 2nd H-Bridge.

I already have the Sabretooth Clone H-Bridge controlling the drive wheels. I need the second one to control the motors in the wrists.

Dan S.

Its been awhile since I enquired about using 2 H bridges. Has anything changed since then to make it easier to program, or is the scripting DJ talked about still needed?

Thanks,

Frank

Still needed bro

You can just use a second sabertooth or Syren (if you only need to drive one motor)... Sabertooth/Syrens are dead easy to use and only require one port to operate...

It's pretty simple to script a H-Bridge to move one motor forward and reverse.

Just hook up the one side as normal (Signal to In1 and In2)

Then have 3 scripts, one for forwards, one for reverse and one for stop.

Assumed In1 on D8 and In2 on D9 with the jumper providing 5v to EnA

# Forward
Set(D8, Off)
Set(D9, On)

# Reverse
Set(D8, On)
Set(D9, Off)

# Stop
Set(D8, Off)
Set(D9, Off)

Then ControlCommand to set the script going for movement or stopping.

Or, you could use 2 TIP transistor circuits, one for each direction, however the setup is likely to me more complex than a simple L298n H-Bridge set up described above.

Wow! Thanks!

Thanks. Ah, but it's not so simple for the feeble minded folks like myself. I should have studied harder in high school!

I already have a Sabertooth for my wheels-- if I get another one for the other part of my robot, can I simply add a 2nd sabertooth control in the software? I have a 2x12 Sabertooth for the wheels but I'm guessing the other motor (a car antenna) could get by with a weaker version of the Sabertooth.

The other option I'm considering is using 2 relays to move the antenna motor back and forth. I don't need speed control and I think I have a 4 channel relay lying around somewhere. More simplistic control over how far the antenna extends, however would be desirable-- would an H bridge make that any easier for me?

Thanks again,

Frank