Author Topic: New to robots  (Read 1940 times)

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Offline Albert.AdderleyTopic starter

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New to robots
« on: July 21, 2015, 06:02:43 AM »
Hi I am planing to build a 4 wheel drive robot with the following spec 4 x 10 inch wheels driven by 4 x  250w 24v electric scooter motors. The building is not a problem the controls are another thing.
I would like to control it by  wireless control the control system would have to be able to control the motors forward and back and I need to transmit video from the robot my control box.plus I would like some spare channels to operate a robot arm around 5 I think would do.
I am not sure if any one on here has done this before? I am building the robot as a sixtith birthday present to my self.
Any help any one can give me on control systems would be a great
Thank you in advance

Offline cyberjeff

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Re: New to robots
« Reply #1 on: July 22, 2015, 02:34:43 AM »
There's a slew of video transmitters and receivers available, they will exist separate from the remote. Look up "FPV".

24V scooter controllers can be found on eBay:

How you would steer that is beyond me.  You can't actually control motor speed, what you control is torque. Adjusting torque from 4 motors to steer is a complex task

Offline ProgressiveAutomations

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Re: New to robots
« Reply #2 on: August 17, 2015, 03:34:35 PM »
You can use H bridges to get precise control of the motors.  You would need 1 H bridge per motor, and you want H bridges that can handle at least 20 amps.  You can find a few different H bridges on our website, http://www.progressiveautomations.com/control-systems/plc-controls . You might get lucky with our WASP motor driver, but that has 10A continuous current, so it would be close.  The Scorpion XXL can control 2 motors, each at 20A continuous.  That would work better.

As for operating the bot wirelessly, you could try an RC controller. That would work easily for the drive motors, you may even be able to find one that's plug and play with the Scorpion. If it's not plug and play, you can use an Arduino as a brain, and input the receiver signals from the RC controller to the Arduino, process them, then output the control signals to the H briges to drive the motors.

Adding 5 extra channels for the arm could be harder.  The easiest way I can think of (though its still not very easy) is to make some sort of bluetooth control and control it with a smart phone.  That would be some advanced programming though.

Another way would be use the switches on a RC controller.  Most controllers I've seen that have lots (5+) of channels, have a bunch of switches and buttons on the controller.  You could use the main joysticks as drive control for the motors, then when you switch a switch the controls change, and now move the arm.  This would be easier to program then bluetooth control, but moving the robotic arm intuitively may be more difficult, because you'd be most likely moving one or two motors at a time, rather then the arm as a whole.  But that depends how you build the arm.

Either way, I've made a fair bit of assumptions about your project, if you can share more details we can help you further.
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