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Trying to rig a Futaba FP-R114H RC Transmitter — Parallax Forums

Trying to rig a Futaba FP-R114H RC Transmitter

DestructinatorDestructinator Posts: 34
edited 2010-01-20 01:28 in Propeller 1
Hey, Im fairly new to the wonderful world of Propeller, and I'm trying to rig it, so that I can use it to run a robot. I have a Futaba FP-R114H controller, and I dont quite know how to hook it up. The input signal that will be controlling the robot is an awesome modded joystick that utilizes a 15 port game plug, that will be jumper wired into the breadboard. If anyone knows anything about this, then Help would be greatly appreciated [noparse]:)[/noparse]

Comments

  • hover1hover1 Posts: 1,929
    edited 2010-01-16 00:00
    The Futaba FP-R114H is a 4 channel 27 MHz receiver/servo controller. You will have to build a circuit to interface with the joystick and then to a 27 MHz transmitter.
    It begs the question, why not just get a 27 Mhx transmitter that will probably have one or two joysticks on it already?

    Jim
  • BADHABITBADHABIT Posts: 138
    edited 2010-01-16 00:22
    Use the Propeller to interface with an 8? channel (how many channels in Rx) Transmitter.

    Emulate the potentiometer voltages that run from the Tx joysticks/controls with a Prop by converting the signals from your fancy joystick in your Prop.

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  • W9GFOW9GFO Posts: 4,010
    edited 2010-01-16 03:11
    You cannot interface your joystick to a receiver. You could however replace the joystick in the transmitter with an "awesome modded joystick" with a little effort.

    If you want to use an RC system to remotely control a robot I would start by using a regular RC transmitter to send the signals to the propeller via the RC receiver.

    Really, to be helpful we need to know more about what you are wanting to do.

    Rich H

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    The Simple Servo Tester, a kit from Gadget Gangster.
  • DestructinatorDestructinator Posts: 34
    edited 2010-01-16 15:03
    I am building a T-Shirt Launcher for a class, and the teacher wants us to use the prop chip. I chose the joystick because it has 6 buttons along with the X and Y. I need 2 buttons to charge the air compressors, one button to fire, and one button to aim the barrel up and another button to aim it down. I chose the prop chip mostly because I want to use the breadboard to make hooking up the joystick easier. I have it hooked up to the prop chip and am programming it now to work with it, but I dont know how to make an RF Circuit. I have the transmitter crystal that goes with the receiver, and it fits into the breadboard, but thats where my experience ends.I chose the Futaba, because it was small and looked somewhat versatile. It was also a whole lot better than the First Controllers that my school has.
  • CannibalRoboticsCannibalRobotics Posts: 535
    edited 2010-01-16 15:37
    Well, asking what may be a dumb question, does it have to be wireless or do you just need the joystick interface with buttons?

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  • DestructinatorDestructinator Posts: 34
    edited 2010-01-16 17:50
    It doesnt have to be, but I would like it to be wireless. The reason being, is that if it were tetheres, then it would have a tether of about 3 feet in length on a robot that can move fairly fast. I would like to be able to drive it around a field and not have my battery run out before it does.

    Post Edited (Destructinator) : 1/16/2010 6:00:34 PM GMT
  • StefanL38StefanL38 Posts: 2,292
    edited 2010-01-16 20:09
    The only "input-channel" of a 27 MHz RC-receiver is 27MHz elecromagnetic waves
    sended out by a 27MHz RC-transmitter.

    So if you want to keep the joystick with the 6 buttons you would have to connect
    this joystick to a 27MHz RC-transmitter. It would be much easier to use a standard 27 MHz RC-control.

    The propeller can be connected to the 27MHz-receiver instead of servos when using the right
    "servo-signal-driver" from the obex and an some resistors.

    As you want to control the robot wireless with a propeller I think it will be easier to use
    a wireless serial-data connection.

    best regards

    Stefan
  • DestructinatorDestructinator Posts: 34
    edited 2010-01-19 12:37
    I have the transmitter that goes with the receiver. i removed the crystal from the original controller, and now need to build an RF circuit on the prop chip in order touse the transmitter
  • ChetChet Posts: 150
    edited 2010-01-19 13:07
    There is a facility for a "trainer cord" connection on the futaba transmitter. I forgot whet the signal was but you can check to see if it is a voltage level or a pulse train and simulate that with the propeller.

    Just a thought
  • W9GFOW9GFO Posts: 4,010
    edited 2010-01-20 01:28
    If you are going to use an RC receiver then you are stuck using the RC transmitter. Modifying the transmitter (the RF part) is unlawful.

    Using the propeller chip to control the transmitter via a trainer cord is an option but I think you would be better off using the propeller on the robot.

    I would suggest getting a 6 channel (or more) RC transmitter/receiver set in either 75 mhz or 2,4 ghz (72mhz is for air).

    Use one stick to control the up/down + left/right aiming and the other stick to drive the robot. The radio will have a couple other switches which could be used for fire and charging of the air compressor. If you get a heli radio one of the switches will be a three position switch so that should work well since you said you needed two buttons for the compressor.

    The propeller chip would be connected up to the RC receiver and could be used to monitor and/or automate the compressor.

    Rich H

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