Darathian
Resolved by Dunning-Kruger!
Since I know some of you have used the Sabertooth and Kangaroo I figured I would ask opinions.
I have decided on the Parralax Arlo base for my next robot chassis. I will use the caster's from parralax.
I will most likely be using the Sabertooth and kangaroo combination for motor controller/PID but I am not decided on this and open to suggestions.
I also find myself in a heated mental debate between the wheel/motor combination from parralax or the Zagros Rex motors and wheels combined with the Sabertooth/Kangaroo.
Item 1:
One of the key items for me is how well the encoders between the two different motor/wheel sets works with the Sabertooth and kangaroo.
Item 2:
The other item floating in my mind is the ground clearance between the two motor/wheel sets. It seems at least to me that the Zagros wheels would provide more ground clearing but since the base plate of the chassis provides stability to the base platform I am not really sure if using the Zagros motors are feasible.
Item 3:
Since I am going to build a body, arms and head on top of the base the torque and weight carrying ability is important.
Item 4:
I need to be able to control both the position and speed of the motors at the same time. For example example I should be able to have to robot move lets say 1 feet at a certain speed.
I know this is kind of an open ended questions but if anyone have used any of these wheel/motor combinations please provide your 2 cents as it relates to the items listed above.
I appreciate any comments or insights you guys can provide.
Tony
Do you have a circuit diagram/parts list for your devider circuit?
I need to use mixed mode.
Thanks
@Tony
I am a bit confused. In doing some research here it appears that the same encoders are used on both the MR200 & MR300. Is that correct? If that is the case then how does the MR300 encoders have 64000 pules and the MR200 only 32000? Does it have something to do with the rpm of the motor? The main reason I ask is because I don't plan on using the motors just adapting the encoders to my own motors.
Thanks
@Darathian, I have not yet done the modification but will get around to it soon, I will build the D type flip flop circuit into the header plug (lead) that goes to the REX motors.
Here is how it works.
@Herr Ball, The encoders are the same for both motors the difference in pulses is because of the gearing which makes the MR200 go twice as fast as the MR300 for this you get reduced torque but higher speed. The motors are identical its just the gearbox that is different between the two motors.
Tony
@Toymaker
Did you ever get the circuit done for the D type flip flop as discussed above and did it work as expected?
Thanks
I myself have the Parallax Alro motors. Way too Fast. Im leaning towards the Zagros base and motors since they claim the motors are at walking speed slow, and that is what im in need of right now. The Parallax motors nearly ran over and broke my foot and crashed thru a wall at its normal speed. Yikes.
@RobotHappy... The Zagros bases are awesome.... The 25rpm motors are very strong and a good speed for autonomous robots... I have two of the Max99 bases... I also have the Arlo base and you're right... it's a bit to big and fast for around the house use....
@Toymaker
I was wondering if you ever built the D type flip flop and if it worked for you.
I want to make sure it worked before going down this route.
Thanks
@Darathian...
Here is the pin out and circuit that Tony is talking about. Hope this helps. I am sure Tony will chime in soon.
Rex