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Author Topic: Can an RC transmitter be hacked to add a trainer port?  (Read 3625 times)

exwhyzed

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Can an RC transmitter be hacked to add a trainer port?
« on: January 23, 2016, 04:36:20 PM »
Hi All,

I have a differential drive robot that I want to control, but I have no appropriate transmitter.  But what i do have is this:

1. Pistol style rc car 3 channel transmitter, and accompanying 3 channel receiver

2. Homemade OpenTX transmitter ( i have sufficient parts to make this).  But this item requires a transmitting module, which I don't want to buy.

So what I'm theorizing is that I want to make the Homemade OpenTX transmitter, and output its data to the circuit board inside the pistol transmitter, which will then send the info to the 3 channel receiver onboard the robot.  and then it will differentially drive away happily!

I'm really excited about this idea because it means that i will be able to turn a bunch of items laying around into a useful transmitter.

Does anyone know if something like this can be done?  I know i'd have a better chance if the pistol recevier had a trainer port that i could interface with.  But this one has none.  I'm going to see if i can take it apart and examine (and upload a picture) of the circuit board to see if it it will yield any answers.

Thanks for any insights that can be provided!

exwhyzed

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Re: Can an RC transmitter be hacked to add a trainer port?
« Reply #1 on: January 23, 2016, 06:25:03 PM »
Ok on a whim, i (first read the manual then) reversed the ESC and servo connections on the receiver. A post on rcgroups said that the servo should behave the same way, and the manual said that the ESC will detect the throttle neutral position...and IT WORKS!!! Sometimes the ESC is not detecting the throttle neutral position and going full blast forward, but i just reset the car power switch and then it usually works the 2nd or 3rd time.

This means that I can take apart the gun transmitter and stuff the electronics into a square plastic box, and use PS2 joysticks as the controls. I just have to connect the correct PS2 potentiometer joysticks in place of the potentiometers on the transmitter.

Actually, first i have to check the ohm-age of the potentiometers on the gun style transmitter, if they are 10K, then all should be good. But if they are 5K or some other value, then i'll have to modify the PS2 joysticks with new potentiometers.

Finally, a stick-style transmitter can be had!

But this means that if i build the OpenTx transmitter, then i will still have no transmitting module for it:(

jinx

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Re: Can an RC transmitter be hacked to add a trainer port?
« Reply #2 on: January 24, 2016, 04:32:19 PM »
am a little confused to what you doing here, why not just wire the receiver to an arduino  read the ppm  on the signal line http://playground.arduino.cc/Code/ReadReceiver
I build bots

 

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