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Help with Receiver/Transmitter and attaching motors?


I have a GWS 2.4GHz transmitter and receiver, seen here.
http://www.robotmarketplace.com/products/0-GWRX4SB.html
http://www.robotmarketplace.com/products/0-GWS24TR.html
Essentially, I am attempting to make a sumobot with two motors taken from an electric screw driver (two wires positive and ground) The receiver is marketed for model airplanes, but I was assured it also works with motors. I am unsure what to plug into where. The receiver has three pins per channel: positive, ground and signal. Does anyone know how I should set this up?

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-max-2 years ago

You should research the operation of the Tx and Rx. Essentially, those 4 channels (up/down & left/right on the right hand gimble/joystick, and the same for the other gimble) will send data to the receiver and the receiver will have 4 PWM or PPM outputs that can be used to control anything, like the speed of a motor or the position of a servo motor. With that cheap remote, the output is probably just PWM.

Drill motors are large and require a large amount of current. You will need to feed the signals from the Rx to a 'control' board which will translate that to a voltage for a motor. Then you may need a motor controller that can power the motor in CW rotation, and CCW rotation based and speed control based on the signals.

From what I find, it looks like what you can do it set the UP/DOWN on the left gimble to control the left wheel, and the UP/DOWN on the right gimble to control the right wheel. You could also make a more sophisticated program which will power both wheels at equal speeds until the LEFT/RIGHT on one of the gimbles is offset, and will cause one wheel to go faster and the other to go slower. That would make the bot turn.

I suggest you look up BaneBots. The sell RC speed controllers that function in both forward and reverse. They also feature a neutral lock that will not arm the motor unless it is receiving a neutral signal (essentially center stick on your typical RC transmitter). I have used these in several applications with great results.

adam 1015 years ago
you could use something like a h - bridge motor circuit but you will need to make sure you have high enough rated components. without proper documentation I cannot know how to attach it. I see that this is an old thread but I felt it needed resolving.
rickharris6 years ago
A screw drive motor may well draw over 1.5 amps when loaded I don't think that Rx will drive that directly - almost ALL rc combinations are intended to drive servo motors.

They will produce either a digital signal proportional to the transmitter input at their outputs for a digital servo or analogue varying pulse width for standard analogue servos - where pulse width is proportional to transmitter output pulse with/stick position.
back to what i said - you need 2 servos modified to rotate continuously they aren't going to cost the earth.
rickharris6 years ago
I suggest you need to get 2 aircraft servos - Modify them for continuous rotation (plenty is web pages to show how.)

The servo will then plug direct into the receiver and do what you want.
gotparsley (author)  rickharris6 years ago
Unfortunately, we have already purchased the materials and are on a tight budget (high school team). We bought the stuff under the impression that the stuff would work as set up. I can attach the sheet that recommended electric screw driver motors with the given receiver if that would be helpful.