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Thread OP
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How do I make a Buddy-Box channel remapper?
What I want to do is connect a buddy box (Futaba 6XAS) to my Futaba 7CAP. The buddy-box would be used to control a swivelling camera with zoom/shutter.
I know I could use a seperate receiver, but I was thinking it would be simple to make a small circuit that goes between the buddy-box and main Tx. The circuit would allow me to map the signal pulses from the sticks of the buddy-box onot the unused channels. I.e. if the main TX uses channels 1,3,4 for Elev/Throttle/Rudder. Then I would want to map the Aileron and Elevator and Switch X channels of the buddy box to say channels 5,6,7. (assuming 7-channel receiver) I have a fuzzy picture in my mind that the PWM signal outputed from the buddy-box would go into a shift register (serial-to-parallel) to seperate the channels, then the channels would be rearranged and merged back into a single stream with another parallel to serial convertor. I'm wondering if I have oversimplified this. Could you guys give me some insight. I'm an electrical eng student, so I need a kick in the right direction if no equations are involved. |
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There's a problem with your plan... if the buddy box switch is held... then the primary TX's sticks won't be controlling the plane.
What you seem to want is a way to plug in the other box's sticks to replace the function of the aux channel potentiometers. Which means you'd have to do a lot of work on both radios and then they'd essentially be permamnently connected to each other. You're better off doing the 2 recievers on 2 frequencies if you want to control the camera tilt/swivel/zoom/shtter from the second TX box. |
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Thread OP
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Oh. I missed a important piece of info. The Futaba 7C allows the buddy switch to override only specific channels. So when I flip the buddy switch, the Master still controls the plane, but the aux channels will be received from the Buddy-box sticks.
I wish there was a generic programming mode in these transmitters to allow mapping of any stick to any channel. Instead there are only the conventional ACRO and HELI presets. |
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I wouldn't bother with shift registers but it would be fairly easy to do the remapping with a microcontroller (PIC/Atmel etc). Read the input channels, rearrange them and output to different channels in the output stream. It's basically what the devices do that allow JR and Futaba to be buddy boxed together.
Steve |
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