I am very new to EZ Robot. I have an EZ Robot kit. I'd like to hack an old toy a Fisher price ride on car that is powered by a single motor. I think 6 v. Would I need an Hbridge for this? If so which one? Or is there another way to connect and control this motor?
I'm considering taking the handle bars off and glue/screw a servo to the steering mount so I could control the steering with Ez-B. I think this toy could be a great chassis for building a larger robotic form factor.
I can provide a photo if needed.
Any thoughts or assistance would be greatly appreciated.
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If you have a multi-meter, you can measure the amps drawn by the motor at stall (run the motor, then grab the wheel to prevent it from turning momentarily an see how many amps it draws. Don't do it for long so you don't burn out the motor). You'll want a motor controller rated a bit higher than the amps at stall of your motor (20% is a good rule of thumb).
Is there a tutorial online with how to solder or wire this Hbridge to the EzB? I do not have any experience with this type of thing. I don't want to destroy any of my Ezb components, the Hbridge or the motor. LOL!
Also, do you think the Ez b servo has enough strength to "turn" the steering mechanism if I mount it directly to it?
Thanks so much!
Most definitely .... yes... If anything the ez robot HDD servo would break the toy first...
And I agree Richard about the servo, should be more than strong enough.
driver: L298N; driver power supply: + 5 V to + 35 V; driver output current (max.): 2A; logic power output Vss: +5 V to +7 V (internal supply +5 V); logic current: 0-36 mA; controlling level: low -0.3 V to 1.5 V, high: 2.3 V-Vss; enable signal level: low -0.3 V to 1.5 V, high: 2.3 V-Vss; max. current: 25 W
Found this t our local microcenter.
Again, the key is how many amps the motor draws. If it draws more than 2 amps, you will see magic blue smoke.
Does this sound correct?
Thanks and sorry for all the silly questions.
I just realized you said this was a rideable toy. Is it a Fisher Price Powerwheels? I think those motors are closer to 20 amps. (I know the fuse is either 20 or 25 amps)
That also may change the suggestion that you could steer it with an HD servo. It should be OK just driving the thing on its own, but if you put a child on board, I am not sure if the servos could handle turning it under full weight. They are strong, but there are certainly limits.
Josh did a Power Wheels conversion here
And so did Robotz