kd208
USA
Asked
— Edited
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.
Thanks,
Keri
You would need an H-Bridge. Hard to say which one without specs on the motor, but most small toy or hobby motors can be driven by the 2.5A H-Bridge sold by EZ-Robot https://synthiam.com/Shop/AccessoriesDetails.aspx?prevCat=9&productNumber=14 (note: this is a commonly available controller, on-line, at Microcenter if you have one near you, or many hobby shops. No need to spend EZ-Robot shipping unless you have other stuff you need to order from them. They offer this as a courtesy for their customers for one-stop shopping, but they don't manufacture it, so you aren't taking money from their pocket if you source it locally).
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).
Alan
Thanks Alan for your quick response. 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! Keri
@KD208..
Most definitely .... yes... If anything the ez robot HDD servo would break the toy first...Thanks Richard.
You don't solder the H-bridge to the EZ-B. It has screw terminals for the motor connections, and you use jumper cables to connect to the EZ-B https://synthiam.com/Shop/AccessoriesDetails.aspx?prevCat=9&productNumber=24 (again, can be purchased from any hobby shop, but if you are ordering from EZR, this is a cheap add on.
And I agree Richard about the servo, should be more than strong enough.
Alan
Will this work? 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. Thanks
That is very similar to the EZ-B one (2amps instead of 2.5, but same controller so will work the same).
Again, the key is how many amps the motor draws. If it draws more than 2 amps, you will see magic blue smoke.
Alan
After researching this am afternoon, it looks like the toy car outputs 4 amp hours or 4 now. So if that us true then I would need something like this I think. http://www.jameco.com/z/RS011MC-Dagu-HiTech-Electronic-Motor-Controller-4-Channel-4-5A-4-5-12V-for-Rover-5-Chassis-Supports-Encoder-Mixing-_2150539.html?CID=GOOG&gclid=Cj0KCQjwr53OBRCDARIsAL0vKrNJij-mw2owUFBlMO-TtCxl5UIUTI4NrfwACQw-rrOzhIaOBwPenCsaArdqEALw_wcB
Does this sound correct? Thanks and sorry for all the silly questions.